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[Display omitted] • Rare [Cu 4 I 2 ]2+ cationic cluster constructs a novel 3D Cu(I)-MOF. • The stable Cu(I)-MOF shows sensitive detection ability for ROX, NFZ and NFT. • Hierarchical porous Cu(I)-MOF/MF composites were built by a one-pot method. • The Cu(I)-MOF/MF exhibits remarkable adsorption capacity towards ROX, NFZ and NFT. Fluorescence quenching induced by photoinduced electron transfer (PET) stands as an effective strategy for identifying water pollutants. Herein, a novel (4, 8)-connected three-dimensional framework Cu(I)-MOF ([Cu 2 I(tpt)] n) with unique 8-connected [Cu 4 I 2 ]2+ cationic clusters is designed by employing the nitrogen-rich ligand (Htpt = 5-[4(1 H -1,2,4-triazol-1-yl)]phenyl-2 H -tetrazole). Water-stabilized Cu(I)-MOF exhibits outstanding fluorescence properties, facilitating its application in detecting organic pollutants in water. Benefiting from the fact that the Cu(I)-MOF possesses a higher lowest unoccupied molecular orbitals (LUMO) energy level than that of the analyte, the rapid d-PET can occur, entitling Cu(I)-MOF to a sensitive fluorescence quenching response to roxarsone (ROX), nitrofurazone (NFZ) and nitrofurantoin (NFT) (with detection limits as low as 0.13 µM, 0.15 µM, and 0.13 µM, respectively). The nitrogen-containing sites of melamine foam (MF) are utilized to facilitate the anchoring and growth of Cu-MOF crystals, which enables the preparation of hierarchical microporous − macroporous Cu(I)-MOF/MF composites. The ordered porous structure of Cu(I)-MOF/MF provides cavities and open sites for the efficient removal of ROX (q max = 210.6 mg∙g−1), NFZ (q max = 111.5 mg∙g−1) and NFT (q max = 238.9 mg∙g−1) from water. This characteristic endows the Cu(I)-MOF/MF with rapid and recyclable adsorption capacity. Therefore, this work provides valuable insights to address the problem of detection and removal of pollutants in the aquatic environment. [ABSTRACT FROM AUTHOR]

AbstractIn this report we present a simple synthesis of a nickel-based metal organic framework (MOF-Ni) at the room temperature using a solution of dimethylformamide (DMF), ethanol and distilled water. The MOF-Ni synthesized in various solvents displayed numerous different properties and advantages over other materials including easy synthesis procedure, good crystallinity, rigidity, and robust chemical stability. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermal gravimetric analysis (TGA) were employed to analyze the as-synthesized MOF-Ni. The as-obtained MOF-Ni was used to investigate its adsorption kinetics of red telon dye (RTL) molecules. The effects of time (30–270 min), initial RTL concentration (20–300 mg/L), adsorbent dose (2–50 mg), solution pH (2–12), and temperature (10–80 °C) were investigated. The pseudo-first order rate equation was able to provide the best description of the adsorption kinetics data in the studied time scale. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms, and the isotherm constants were also determined. Dye adsorption turned out to strongly depend on pH, and a low pH was found to increase the amount of adsorbed dyestuff. Compared with other samples, MOF-Ni synthesized in (DMF ​+ ​C2H5OH ​+ ​H2O) had a significantly enhanced adsorption ability for RTL dye. The MOF-Ni high adsorption capacity for RTL dye was attributed to the electrostatic attraction/repulsion phenomena. Moreover, MOF-Ni showed an improved stability at 370, 417, and 423 °C temperatures. The results obtained through our experiments suggested that our porous MOF-Ni microstructures synthesized in DMF ​+ ​C2H5OH ​+ ​H2O have potential applications for treating wastewaters containing RTL dyes. [ABSTRACT FROM AUTHOR]

Porous materials that could recognize specific molecules from complex mixtures are of great potential in improving the current energy‐intensive multistep separation processes. However, due to the highly similar structures and properties of the mixtures, the design of desired porous materials remains challenging. Herein, a sulfonate‐functionalized metal–organic framework ZU‐609 with suitable pore size and pore chemistry is designed for 1,3‐butadiene (C4H6) purification from complex C4 mixtures. The sulfonate anions decorated in the channel achieve selective recognition of C4H6 from other C4 olefins with subtle polarity differences through C−H⋅⋅⋅O−S interactions, affording recorded C4H6/trans‐2‐C4H8 selectivity (4.4). Meanwhile, the shrunken mouth of the channel with a suitable pore size (4.6 Å) exhibits exclusion effect to the larger molecules cis‐2‐C4H8, iso‐C4H8, n‐C4H10 and iso‐C4H10. Benefiting from the moderate C4 olefins binding affinity exhibited by sulfonate anions, the adsorbed C4H6 could be easily regenerated near ambient conditions. Polymer‐grade 1,3‐butadiene (99.5 %) is firstly obtained from 7‐component C4 mixtures via one adsorption‐desorption cycle. The work demonstrates the great potential of synergistic recognition of size‐sieving and thermodynamically equilibrium in dealing with complex mixtures. [ABSTRACT FROM AUTHOR]

Porous materials that could recognize specific molecules from complex mixtures are of great potential in improving the current energy‐intensive multistep separation processes. However, due to the highly similar structures and properties of the mixtures, the design of desired porous materials remains challenging. Herein, a sulfonate‐functionalized metal–organic framework ZU‐609 with suitable pore size and pore chemistry is designed for 1,3‐butadiene (C4H6) purification from complex C4 mixtures. The sulfonate anions decorated in the channel achieve selective recognition of C4H6 from other C4 olefins with subtle polarity differences through C−H⋅⋅⋅O−S interactions, affording recorded C4H6/trans‐2‐C4H8 selectivity (4.4). Meanwhile, the shrunken mouth of the channel with a suitable pore size (4.6 Å) exhibits exclusion effect to the larger molecules cis‐2‐C4H8, iso‐C4H8, n‐C4H10 and iso‐C4H10. Benefiting from the moderate C4 olefins binding affinity exhibited by sulfonate anions, the adsorbed C4H6 could be easily regenerated near ambient conditions. Polymer‐grade 1,3‐butadiene (99.5 %) is firstly obtained from 7‐component C4 mixtures via one adsorption‐desorption cycle. The work demonstrates the great potential of synergistic recognition of size‐sieving and thermodynamically equilibrium in dealing with complex mixtures. [ABSTRACT FROM AUTHOR]

Pharmaceuticals and personal care products (PPCPs) have been increasingly used all over the world and they have been reported on water cycle and cause contamination. Among these pharmaceuticals is caffeine (CAF). In this work, CAF removal from aqueous samples by metal–organic framework (UIO-66) and perovskite (La0.7Sr0.3FeO3) was achieved. Detailed studies on the preparation of MOFs and perovskite oxides compounds have been presented. Extensive characterizations such as X-Ray diffraction (XRD), field emission scanning electron microscope (FESEM), Fourier transform infrared spectra (FT-IR), N2 adsorption–desorption isotherms were also carried out to assure proper formation and to better understand the physico-chemical behavior of the synthesized samples before and after adsorption. Batch experiments of CAF adsorption onto both MOFs and perovskite were performed to compare the effectiveness of both materials on the removal competence of the CAF residue at different conditions including the effect of pH, initial concentration, and contact time. It was observed that the adsorption capacity of CAF by MOF increased with increasing acidity. On the other hand, the adsorption capacity of perovskite is stable in pH 4–10. The maximum adsorption capacities of UiO-66 and perovskite toward CAF are high as 62.5 mg g−1 and 35.25 mg g−1, respectively. Equilibrium isotherms were investigated by numerous models: Langmuir, Freundlich, Temkin, Redlich-Peterson, Sips, Langmuir-Freundlich, Toth, Kahn, Baudu, and Fritz Schlunder. Moreover, the kinetics of the CAF@MOF and CAF@Perovskite systems have been studied by five kinetic models (Pseudo-1st -order (PFO), Pseudo-2nd -order (PSO), Mixed 1st, 2nd-order, Intraparticle diffusion and Avrami). The best model described the adsorption of CAF onto both of MOF and perovskite was the mixed 1st, 2nd-order model. The metal–organic framework and perovskite were applied to quickly extract CAF from water samples successfully. The maximum removal percentage obtained for MOF and perovskite was 0.89% and 0.94% respectively within 30 min contact time which suggests that these materials are considered as promising adsorbents for CAF. [ABSTRACT FROM AUTHOR]

[Display omitted] As a noble metal with extremely high economic benefits, the recovery of silver ions has attracted a particular deal of attention. However, it is a challenge to recover silver ions efficiently and selectively from aqueous solutions. In this research, the novel metal–organic frameworks (MOFs) adsorbent (Zr-DPHT) is prepared for the highly efficient and selective recovery of silver ions from wastewater. Experimental findings reveal that Zr-DPHT's adsorption of Ag(I) constitutes an endothermic process, with an optimal pH of 5 and exhibits a maximum adsorption capacity of 268.3 mg·g−1. Isotherm studies show that the adsorption of Ag(I) by Zr-DPHT is mainly monolayer chemical adsorption. Kinetic studies indicate that the internal diffusion of Ag(I) in Zr-DPHT may be the rate-limiting step. The mechanism for Ag(I) adsorption on Zr-DPHT involves electrostatic interactions and chelation. In competitive adsorption, Ag(I) has the largest partition coefficient (9.64 mL·mg−1), indicating a strong interaction between Zr-DPHT and Ag(I). It is proven in the adsorption–desorption cycle experiments that Zr-DPHT has good regeneration performance. The research results indicate that Zr-DPHT can serve as a potential adsorbent for efficiently and selectively capturing Ag(I), providing a new direction for MOFs in the recycling field of precious metals. [ABSTRACT FROM AUTHOR]

Facing the complex coexistence of various metal ions in wastewater and mineral resources, metal–organic frameworks (MOFs) with diverse functionalities and tunable pores are poised to serve as distinctive solutions for efficiently recognizing and selectively separating radioactive thorium (Th(IV)). Herein, a fluorescent MOF (DBT‐DHTA‐Cd) with unique thorium nanocavity traps is rationally designed by using two rigid ligands, including azole and hydroxyl groups, respectively. Notably, the synergistic effect of the appropriate pore size and dense hydroxyl···N nanocavity traps in DBT‐DHTA‐Cd results in selective capture of Th(IV), arising from the high charge density of nano‐trap and extremely low binding energy (Eads = −602.7 KJ mol−1). The fast adsorption kinetics (30 min) and rapid fluorescence response (1 min) of DBT‐DHTA‐Cd toward Th(IV) are attributed to the stronger electron holding capacity of the d and f orbitals belonged to Th(IV), making it more prone to accepting electrons transferred from the N/O active sites in the nano‐trap. As a verification test, tailing breakthrough experiments confirm that DBT‐DHTA‐Cd can efficiently purify Th(IV) from monazite mining solid waste in one step. This work provides profound insights into relationship between structure and property of MOFs and has valuable guidance for designing materials in the radioactive purification field. [ABSTRACT FROM AUTHOR]

JUK-8 ([Zn(oba)(pip)]n, oba2– = 4,4′-oxybis(benzenedicarboxylate), pip = 4-pyridyl-functionalized benzene-1,3-dicarbohydrazide) is a hydrolytically stable flexible metal-organic framework. Owing to its unusual adsorptive properties, JUK-8 can be considered as a promising sensing material for construction of detectors of volatile organic compounds (VOCs) in air. Quasi-equilibrated temperature-programmed desorption and adsorption (QE-TPDA) is a versatile method dedicated to characterization of porous materials. In this work, QE-TPDA was employed to study co-adsorption of water and selected alcohols in JUK-8. For the first time an infrared detector sensitive to organic compounds was used in the QE-TPDA measurements, allowing the study of the influence of water vapor on sorption of VOCs. The QE-TPDA profiles of the studied alcohols, exhibiting two desorption maxima and two adsorption minima, are consistent with the standard sorption isotherms, revealing a two-step adsorption–desorption mechanism. The profiles recorded in the presence of water are noticeably changed in different ways for different alcohols. While at low relative humidity (RH) (ca. 20%) the low temperature adsorption states of ethanol and 1-propanol were only slightly destabilized, for 2-propanol almost complete suppression of adsorption was observed. The results found for moderate RH levels (ca. 50%) indicated that the opening of the JUK-8 structure, responsible for its breathing behavior, was followed by the filling of the just generated pores with a water–alcohol mixture. [ABSTRACT FROM AUTHOR]

Chemotherapy is one of the most commonly used methods for treating cancer, but its side effects severely limit its application and impair treatment effectiveness. Removing off-target chemotherapy drugs from the serum promptly through adsorption is the most direct approach to minimize their side effects. In this study, we synthesized a series of adsorption materials to remove the chemotherapy drug doxorubicin by modifying MOF nanosheets with sulfonated azocalix[4]arenes. The strong affinity of sulfonated azocalix[4]arenes for doxorubicin results in high adsorption strength (Langmuir adsorption constant = 2.45–5.73 L mg−1) and more complete removal of the drug. The extensive external surface area of the 2D nanosheets facilitates the exposure of a large number of accessible adsorption sites, which capture DOX molecules without internal diffusion, leading to a high adsorption rate (pseudo-second-order rate constant = 0.0058–0.0065 g mg−1 min−1). These adsorbents perform effectively in physiological environments and exhibit low cytotoxicity and good hemocompatibility. These features make them suitable for removing doxorubicin from serum during "drug capture" procedures. The optimal adsorbent can remove 91% of the clinical concentration of doxorubicin within 5 min. [ABSTRACT FROM AUTHOR]

[Display omitted] Metal-organic frameworks (MOFs) have been widely studied for Cr(VI) adsorption in water. Theoretically, numerous MOFs can be synthesised by assembling diverse metals and ligands. However, the traditional manual experimentation for screening high-performance MOFs is resource-intensive and inefficient. A screening strategy for MOFs based on machine learning was proposed for the adsorption and removal of Cr(VI) from water. By collecting the characteristics of MOFs and the experimental parameters of Cr(VI) adsorption from the literature, a dataset was constructed to predict the adsorption performance. Among the six regression models, the model trained by the extreme gradient boosted tree algorithm had the best performance and was used to simulate the adsorption and screen potential high-performance adsorbents. Structure-property analysis indicated that prepared MOF adsorbents with properties of 0.37 < largest cavity diameter < 0.71 nm, 0.18 < pore volume < 0.57 cm3/g, 412 < specific surface area < 1588 m2/g, 0.43 < void fraction < 0.62 will achieve enhanced adsorption of Cr(VI) in water. High-performance adsorbents were successfully screened using a combination of machine-learning prediction and analysis. Experiments were conducted to verify the exceptional adsorption capacity of UiO-66 and MOF-801. This method effectively identified adsorbents and accelerated the development of new MOF adsorbents for contaminant removal, providing a novel approach for the discovery of superior adsorbents. [ABSTRACT FROM AUTHOR]

The selective removal and immobilization of uranyl ions from aqueous solutions is essential for the sustainable development of nuclear energy. Herein, a robust lanthanide‐organic framework material (IHEP‐24) is developed for simultaneous fluorescence sensing, selective adsorption, and photocatalytic reduction of uranium, integrating three different functions in one material. The confined space formed by the coordination assembly of viologen derivative ligands and metal‐oxygen clusters can act as precise recognition sites for uranyl, allowing IHEP‐24 to efficiently detect and capture uranyl ions. In addition, the presence of a viologen‐based radical ligand enables IHEP‐24 to a further photocatalytic reduction of the adsorbed uranyl to amorphous UO2. The mechanisms of adsorption and photocatalysis are revealed by batch experiments, photoelectrochemical characterizations, and theoretical calculations. This study provides a reference for the construction of robust multi‐functional MOF materials and also provides support for the deep removal and immobilization of radionuclides from aqueous solution. [ABSTRACT FROM AUTHOR]

Propylene (C3H6) is a crucial olefin raw material used in the production of polypropylene, which is the world's second-most produced synthetic plastic. Separating propylene from propane (C3H8) is an important and significant challenge for industry due to the similar molecular sizes and physical properties of these gases. At present, the usual method for this separation is energy-intensive cryogenic distillation, which has low efficiency and high energy consumption. Therefore, an energy-efficient alternative way is in an urgent demand. Metal-organic frameworks (MOFs) are promising candidates for propylene/propane separation, thanks to the well-defined, designable, modifiable, and flexible structures. This review provides a summary of a recent development of MOFs that are able to discriminate between propylene and propane. The key factors that determine the separation performance of MOFs, primarily from the perspectives of pore size, presence of open metal sites (OMS) and MOFs membranes are summarized. Besides, the challenges that must be addressed for the further development of separations utilizing MOFs are also discussed. [ABSTRACT FROM AUTHOR]

• The synthesized MOFs adsorbed fluorine efficiently through synergistic action. • The maximum adsorption capacity of La-Fe@PTA was 95 mg/g for fluoride ions. • The synthesized adsorbent has good practical application to mine water. Water fluoride pollution has caused non-negligible harm to the environment and humans, and thus it is crucial to find a suitable treatment technology. In this study, La-Fe@PTA adsorbent was synthesized for the defluoridation of mine water. The results showed that the optimum conditions for defluoridation by La-Fe@PTA were pH close to 7.0, the initial F− concentration of 10 mg/L, the dosage of 0.5 g/L and the adsorption time of 240 min. Compared with SO 4 2‒, Cl‒, NO 3 ‒, Ca2+ and Mg2+, CO 3 2‒ and HCO 3 ‒ presented severer inhibition on fluoride uptake by La-Fe@PTA. The adsorption process fits well with the pseudo-second-order kinetic model and Freundlich model, and the maximum adsorption capacity of Langmuir model was 95 mg/g. Fixed-bed adsorption results indicated that fluoride in practical fluorinated mine water could be effectively removed from 3.6 mg/L to less than 1.5 mg/L within 130 bed volume (BV) by using 1.5 g La-Fe@PTA. Furthermore, the adsorbent still had good adsorption capacity after regeneration, which confirms the great application potential of La-Fe@PTA as a fluoride ion adsorbent. The mechanism analysis showed that La-Fe@PTA adsorption of fluorine ions is a physicochemical reaction driven by electrostatic attraction and ion exchange. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] • Plastics waster derived defective d -UiO-66 was synthesized by solvent-free routine. • d -UiO-66 possesses higher surface areas and pore volume than pristine UiO-66. • The LOM adsorption capacity of d -UiO-66 is 3.5 times of UiO-66. • d -UiO-66 exhibits the record LOM adsorption capacity of 588 g mg−1. • Defects in d -UiO-66 promote the mass transfer and create more active sites. Large amount of polyethylene terephthalate (PET) plastics waster and emerging contaminants in water, including fluoroquinolone antibiotics, pose challenges to human survival. In this work, a green synthesis scheme is proposed in which the defective UiO-66 (d -UiO-66) is fabricated via a solvent-free routine by using PET plastics waster as raw materials for lomefloxacin (LOM) removal. In comparison with defect-free UiO-66, the created defect imparts d -UiO-66 with higher porosity and abundant defective Zr sites, which are beneficial to boost LOM adsorption. As expected, d -UiO-66 exhibited excellent LOM adsorption performances, showcasing a saturation adsorption capacity of 588 mg g−1 and a kinetic rate constant of 0.204 g mg−1 h−1, which are 3.5 and 2.0 times higher than those of the pristine UiO-66, respectively. Remarkably, the LOM saturation adsorption capacity of d -UiO-66 surpasses that of all reported adsorbents. Mechanism study reveals that this outstanding adsorption performance of d -UiO-66 is mainly ascribed to the abundant defective sites, high porosity, together with the strong hydrogen bonding interaction and π-π stacking interaction between d -UiO-66 and LOM. Therefore, the d -UiO-66 obtained by the solvent-free method can not only effectively upcycle PET plastic waster, but also efficiently remove LOM, demonstrating a potential routine to simultaneous address the solid PET waster and wastewater. [ABSTRACT FROM AUTHOR]

High‐purity octafluoropropane (C3F8) electronic specialty gas is a key chemical raw material in semiconductor and integrated circuit manufacturing industry, while selective removal of hexafluoropropylene (C3F6) impurity for C3F8 purification is essential but a challenging task. Here we report a fluorinated cage‐like MOF Zn‐bzc‐CF3 (bzc=5‐(trifluoromethyl)‐1H‐pyrazole‐4‐carboxylic acid) for C3F6/C3F8 separation. The incorporation of −CF3 groups not only provides suitable pore aperture size for highly efficient size‐exclusive C3F6/C3F8 separation, but also creates hydrophobic microenvironments, endowing Zn‐bz‐CF3 high chemical stability. Remarkably, Zn‐bzc‐CF3 exhibits high C3F6 adsorption capacity while excluding C3F8, achieving ideal molecular‐sieving C3F6/C3F8 separation. Breakthrough experiments show that Zn‐bzc‐CF3 can efficiently separate C3F6/C3F8 mixture and high‐purity C3F8 (99.9 %) can be obtained. [ABSTRACT FROM AUTHOR]

High‐purity octafluoropropane (C3F8) electronic specialty gas is a key chemical raw material in semiconductor and integrated circuit manufacturing industry, while selective removal of hexafluoropropylene (C3F6) impurity for C3F8 purification is essential but a challenging task. Here we report a fluorinated cage‐like MOF Zn‐bzc‐CF3 (bzc=5‐(trifluoromethyl)‐1H‐pyrazole‐4‐carboxylic acid) for C3F6/C3F8 separation. The incorporation of −CF3 groups not only provides suitable pore aperture size for highly efficient size‐exclusive C3F6/C3F8 separation, but also creates hydrophobic microenvironments, endowing Zn‐bz‐CF3 high chemical stability. Remarkably, Zn‐bzc‐CF3 exhibits high C3F6 adsorption capacity while excluding C3F8, achieving ideal molecular‐sieving C3F6/C3F8 separation. Breakthrough experiments show that Zn‐bzc‐CF3 can efficiently separate C3F6/C3F8 mixture and high‐purity C3F8 (99.9 %) can be obtained. [ABSTRACT FROM AUTHOR]

Core–Shell structured microspheres with a packed nano‐platelet copper hydroxysulfate (CHS) core and an octahedral crystalized metal–organic framework‐199 (CHS@M199) shell are synthesized and tested as adsorbent for gaseous formaldehyde (FA). CHS@M199 outperforms reference materials (e.g., activated carbon (AC), CHS, and M199) with adsorption capacity (Q) of 8.13 mg g−1 and partition coefficient (PC) of 0.263 mol kg−1 Pa−1 against 10 Pa FA at 10% breakthrough (BT) level with the aid of large surface area and copper sites for coordinating with carbonyl group. Contrary to general expectations, CHS@M199 exhibits a unique adsorption behavior in that BT volume increases systematically with the rise in FA inlet partial pressure (e.g., 5–10 Pa). The 10% BT capacity of CHS@M199 decreases noticeably (8.13 to 2.08 mg g−1) with increasing relative humidity (0.016 to 10%), reflecting water‐FA competition for hydrophilic adsorption sites. Although FA adsorption on CHS@M199 diminishes with elevated RH levels, such reduction intensifies when simulating ambient conditions (through stepwise addition of competing components: O2, CO2, and H2O). The FA adsorption on CHS@M199 is well described by both pseudo‐first‐order (PFO) and pseudo‐second‐order (PSO) kinetics. Polymerization may play a pivotal role in the adsorption of FA on CHS@M199, as Qi‐LeVan isotherm best fits the experimental data. [ABSTRACT FROM AUTHOR]

A series of NH2-functionalized nano-sized magnetic metal–organic frameworks (MOFs) were prepared in this study for Cr(VI) removal from wastewater. It was observed that not only the morphological, i.e., orientation growth of N-doped and iron-based metal–organic frameworks, but also the adsorption of magnetic MOFs is largely related to the used amount of ammonium hydroxide in preparation. For example, with increasing amounts of ammonium hydroxide used in preparation, the morphology of magnetic MOFs changed from spherical to cube and triangular cone. Moreover, the maximum adsorption capacity of spherical-magnetic MOFs, cubic-magnetic MOFs and triangular cone-magnetic MOFs could be up to 204.08 mg/g, 232.56 mg/g and 270.27 mg/g, respectively. Under optimal conditions, the adsorption process of magnetic MOFs for Cr(VI) was consistent with the pseudo-second-order rate equation (R2 = 1) and Langmuir isotherm model (R2 > 0.99). Therefore, magnetic MOFs developed in this work offered a viable option for the removal of Cr(VI) from wastewater. [ABSTRACT FROM AUTHOR]

The efficient removal of thorium from the environment is critical due to the risks it poses to organisms. Metal–organic frameworks are favored by scholars because of their potential to effectively adsorb a variety of heavy metal ions in wastewater treatment. In this work, the interaction of UiO-66-NH2 surface with graphene, enhances adsorption capacity of MOFs. Optimal adsorption conditions have been identified, and a detailed adsorption mechanism has also been comprehensively discussed. The theoretical maximum adsorption capacity exhibited by UiO-66-GO is 119.57 mg g−1. Moreover, it shows a fast adsorption rate and reached equilibrium within 20 min. The development of materials with good adsorption performance and fast adsorption for Th(IV) plays an important role in the development of Th(IV) adsorption in the future. [ABSTRACT FROM AUTHOR]

The modified metal-organic framework (MOF) nanocomposites were fabricated using the various facile preparation methods including co-precipitation, hydrothermal, solvothermal for the adsorption of methylene blue (MB) ions in the batch process. The modification of the MOFs nanocomposites was carried out using boehmite as a low cost material. The characterization tests comprising XRD, FTIR, FESEM, TEM and BET were also performed to recognize the physico-chemical properties of the prepared adsorbents. The well dispersed samples synthesized by hydrothermal method with more surface area (about 560 m2/g) with octahedral and cubic morphology (with size less than 50 nm) compared to the other nanocomposites had a better performance in adsorption of dye pollutant. The maximum adsorption capacity was measured for the prepared BTC-MOF sample to be about 250 mg/g in comparison with the other samples by employing linearized Langmuir equation. The good matching between the pseudo second order kinetic and experimental data showed the strong electrostatic adsorption in the present work. Thermodynamic parameters including Gibbs free energy (ΔG0), entropy (ΔS0), and enthalpy (ΔH0) were studied for the adsorption of MB on the Cu-BTC@Bo.H sample at the different temperatures. Reusing adsorbent in adsorption of MB ions in the seven consecutive cycles indicated that the investigated nanocomposites can be employed on an industrial scale. [Display omitted] • Modified MOFs were fabricated by co-precipitation, hydrothermal, solvothermal. • Nanocomposites were modified by boehmite. • Maximum adsorption capacity was calculated to be 250 mg/g for removal of MB. • Langmuir and pseudo second equations were matched by data. • MOFs were prepared with size less than 50 nm with high dispersion. • Proper regeneration of Cu-BTC@Bo.H was investigated for adsorption of MB in seven cycles. [ABSTRACT FROM AUTHOR]

Metal–organic frameworks (MOFs) are regarded as excellent carriers for immobilized enzymes due to their substantial specific surface area, high porosity, and easily tunable pore size. Nevertheless, the use of UIO−66 material is significantly limited in immobilized enzymes due to the absence of active functional groups on its surface. This study comprised the synthesis of UIO−66 and subsequent modification of the proline (Pro) on UIO−66 through post-synthetic modification. UIO−66 and UIO−66/Pro crystals were employed as matrices to immobilize Rhizopus oryzae lipase (ROL). The contact angle demonstrated that the introduction of Pro onto UIO−66 resulted in favorable conformational changes in the structure of ROL. The immobilized enzyme ROL@UIO−66/Pro, produced via the covalent-bonding method, exhibited greater activity (0.064715 U/mg (about 1.73 times that of the free enzyme)) and stability in the ester hydrolysis reaction. The immobilized enzymes ROL@UIO−66 (131.193 mM) and ROL@UIO−66/Pro (121.367 mM), which were synthesized using the covalent-bonding approach, exhibited a lower Km and higher substrate affinity compared to the immobilized enzyme ROL@UIO−66/Pro (24.033 mM) produced via the adsorption method. This lays a solid foundation for the industrialization of immobilized enzymes. [ABSTRACT FROM AUTHOR]

Context: MOFs are promising candidates for the capture of H2S and CO2 from raw biogas. The presence of H2S residues in natural gas pipelines can cause corrosive damage and reduce energy efficiency. H2S capture from biogas presents several challenges due to its high toxicity and its corrosiveness. Microporous MOFs incorporating Lewis basic sites have demonstrated efficient capture of small and polar gas molecules such as CO2 and H2S from gas binary mixtures. In the quest to design and investigate functional materials to support the energy transition, specifically for the purification of RNG gas, we theoretically investigated the potential of s-heptazine-based IRH-1 for H2S capture from CH4 mixtures. IRH-1 exhibited significantly higher adsorption capacities for H2S (2.60 mmol/g) and CO2 (2.68 mmol/g) compared to CH4 (0.98 mmol/g) at 100 kPa and 298 K simulated by GCMC. All computed average energies for H2S were below 20 kJ/mol, indicating an exothermic physisorption behavior within the pores of IRH-1. IAST revealed remarkable H2S selectivity of IRH-1 for CH4/H2S binary mixtures at 5%, 10%, 15%, and 20% of H2S at 100 kPa. Methods: GCMC simulations were performed with the BIOVIA Materials Studio 5.0 package using LJ potentials and UFF parameters to investigate the adsorption of pure H2S gas in the IRH-1 material. The IAST method was used to predict the adsorption behavior of H2S in different H2S/CH4 gas mixtures. The IAST calculations were performed using the Python package pyIAST, which allows the prediction of adsorption isotherms for mixed gases based on the adsorption isotherms for pure gases by numerical integration of the Gibbs adsorption approach. [ABSTRACT FROM AUTHOR]

Several types of pollutants have acute adverse effects on living bodies, and the effective removal of these pollutants remains a challenge. Safranin O (a biological dye) and merbromin (a topical mercury-containing antiseptic) are considered organic pollutants, and there are only a few reports on their removal. Synthesized and well-characterized (through PXRD, FTIR, FESEM, and EDS analysis) MOF-5 was used for the first time in the removal of safranin O and merbromin from simulated wastewater and real wastewater. In both cases, MOF-5 effectively removed contaminants. We found that in simulated wastewater, the highest efficiency of removal of safranin O was 53.27% (for 15 mg/L) at pH 10, and for merbromin, it was 41.49% (for 25 mg/L) at pH 6. In the case of real wastewater containing natural ions (Na+, K+, F−, Cl−, SO42−, PO43−, Mg2+, and Ca2+) and other molecules, the removal efficiencies of these two dyes decreased (34.00% and 26.28% for safranin O and merbromin, respectively) because of the presence of other ions and molecules. A plausible mechanism for the removal of these pollutants using MOF-5 was proposed. [ABSTRACT FROM AUTHOR]

The shape and topology of pores have significant impacts on the gas storage properties of nanoporous materials. Metal–organic frameworks (MOFs) are ideal materials with which to tailor to the needs of specific applications, due to properties such as their tunable structure and high specific surface area. It is, therefore, particularly important to develop descriptors that accurately identify the topological features of MOF pores. In this work, a topological data analysis method was used to develop a topological descriptor, based on the pore topology, which was combined with the Extreme Gradient Boosting (XGBoost) algorithm to predict the adsorption performance of MOFs for methane/ethane/propane. The final results show that this descriptor can accurately predict the performance of MOFs, and the introduction of the topological descriptor also significantly improves the accuracy of the model, resulting in an increase of up to 17.55% in the R2 value of the model and a decrease of up to 46.1% in the RMSE, compared to commonly used models that are based on the structural descriptor. The results of this study contribute to a deeper understanding of the relationship between the performance and structure of MOFs and provide useful guidelines and strategies for the design of high-performance separation materials. [ABSTRACT FROM AUTHOR]

Organophosphates (OPs) being the most widely used (~ 36%) pesticides, are infamous for presence of their traces in surface waters and serious health hazards to humans and animals. Hence, rapid, efficient, easy to use, and cost-effective methods must be explored for their remediation in contaminated waters. Amongst the different pesticide removal methods, adsorption is extensively used as it is economic unit process which is easy to operate and renders no residual by-product. Moreover, nano-sized adsorbents with novel physico-chemical properties may even be more effectively employed for sorptive removal of OPPs in contaminated waters. The review provides an overview of organophosphate pesticides (OPPs) in terms of usage, environmental contamination, and toxicity. Nanomaterials (e.g., carbon nano-structures, metal nanoparticles and oxides, quantum dots, and metal organic frameworks) categorized into inorganic, organic, and hybrid nanomaterials employed for adsorptive removal of OPPs from aqueous phase have been discussed. The parameters that determine their adsorption efficiency have been discussed, calculated, and compared for different nanostructures. The operating mechanisms behind adsorption of OPPs on nanomaterials are mainly electrostatic interactions, H-bonding, and Π-Π stacking (carbon-based nanomaterials), and exchange or sharing of electrons between vacant active site of nanocomposite and OPP molecules (in case of hybrid materials). Diffusion mechanism and rate-limiting steps have been explored via intra-particle diffusion model. The factors influencing the efficiency of adsorbents such as pH, temperature, adsorbent concentration, and incubation time have also been included. The review further recapitulates the details of thermodynamic studies of adsorption process which give information about the spontaneity and exothermic/endothermic nature of the process. The review concludes with summary and future prospects of sorptive removal of OPPs in water. Adsorption of OPPs onto different nanosorbents via variety of interactions [ABSTRACT FROM AUTHOR]

Metal–organic framework (MOF) synthesis has been studied for over 50 years, yet its use in adsorbing herbicides is still under investigation. This study examined the effects of amino‐MIL‐101(Fe) on the adsorption and removal of atrazine (AZ). The novel amino‐MIL‐101(Fe) nanoadsorbent has been completely characterized after and before the adsorption process using Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), X‐ray diffraction (XRD), energy‐dispersive X‐ray photoelectron spectroscopy (XPS), and nitrogen adsorption–desorption isotherm. The Brunauer–Emmett–Teller (BET) surface area of the novel amino‐MIL‐101(Fe) nanoadsorbent before and after five‐time reuse were 1222 and 1038 m2/g, respectively. The amino‐MIL‐101(Fe) nanoadsorbent was found to have the greatest adsorption capacity (qmax) of 321.55 mg/g. Variables such as herbicide concentration, pH, adsorbent dosage, and temperature that affect the adsorption process have been investigated. It was found that the ideal conditions for high adsorption capacity were pH 4 and a dose of 0.02 g. The adsorption isotherm and the kinetic isotherm were fitted to the Langmuir equation and the pseudo‐second‐order equation, respectively. The chemisorption mechanism was identified as the driving force. According to adsorption thermodynamics, the adsorption process was spontaneous and endothermic. The quantities of AZ adsorbed grew along with the temperature. The amino‐MIL‐101(Fe) nanoadsorbent can be reused up to five times with no change in its chemical composition and identical results from XRD before and after reuse. The mechanism of interaction by which the amino‐MIL‐101(Fe) interacted with the AZ has been represented. [ABSTRACT FROM AUTHOR]

The flue gas produced by fossil fuel combustion contains a large amount of CO 2 , and the greenhouse effect caused by CO 2 emissions is becoming increasingly serious. There is an urgent need to develop adsorbents with excellent CO 2 adsorption performance. In this study, a new composite graphene oxide (GO) -metal-organic framework (MOF) (UiO-66-(OH) 2 /GO) was synthesized using UiO-66-(OH) 2 as a precursor. Structural analysis of the parent materials and composites found that pore structures and Brunauer–Emmett–Teller (BET) surface area could be adjusted by adding GO, and GO was tested as a carbon dioxide adsorbent at 273 K and 298 K. The maximum CO 2 adsorption of the composites was 5.03 mmol/g and 4.34 mmol/g, which was 36.7% and 36.9% higher than that of the parent materials at 1 bar, respectively. Dynamic breakthrough experiments were used to study the CO 2 /N 2 separation capability of the composites. The stability of composites was studied by chemical stability experiments and several adsorption/desorption experiments. The results showed that the composites had good acid resistance and cycle stability. The separation performance of CO 2 /N 2 in the presence of water vapor was investigated, and the composites showed good water stability. Therefore, UiO-66-(OH) 2 /GO has latent applications in CO 2 capture technology to mitigate global warming. [ABSTRACT FROM AUTHOR]

Severe polysulfide dissolution and shuttling are the main challenges that plague the long cycle life and capacity retention of lithium‐sulfur (Li‐S) batteries. To address these challenges, efficient separators are designed and modified with a dual functional bimetallic metal‐organic framework (MOF). Flower‐shaped bimetallic MOFs (i.e., Fe‐ZIF‐8) with nanostructured pores are synthesized at 35 °C in water by introducing dopant metal sites (Fe), which are then coated on a polypropylene (PP) separator to provide selective channels, thereby effectively inhibiting the migration of lithium polysulfides while allowing homogeneous transport of Li‐ions. The active sites of the Fe‐ZIF‐8 enable electrocatalytic conversion, facilitating the conversion of lithium polysulfides. Moreover, the developed separator can prevent dendrite formation due to the uniform pore size and hence the even Li‐ion transport and deposition. A coin cell using a Fe‐ZIF‐8/PP separator with S‐loaded carbon cathode displayed a high cycle life of 1000 cycles with a high initial discharge capacity of 863 mAh g−1 at 0.5 C and a discharge capacity of 746 mAh g−1 at a high rate of 3 C. Promising specific capacity has been documented even under high sulfur loading of 5.0 mg cm−2 and electrolyte to the sulfur ratio (E/S) of 5 µL mg−1. [ABSTRACT FROM AUTHOR]

Intensive urbanization and industrialization has led to increasing water pollution by heavy metals, adversely affecting human health and the environment. Among the different technologies available for heavy metals removal from water, adsorption is regarded as the most effective approach. Nanomaterials, especially magnetic nanoparticles, have emerged as promising tools for heavy metals removal because of their unique properties. One of the main drawbacks with magnetic nanoparticles is their tendency to form aggregates in solution, decreasing their efficacy and limiting their applications in water treatment. In order to stabilize magnetic nanoparticles, researchers have therefore begun modifying their surfaces with a variety of support media. In addition to carbon-based materials, natural and synthetic polymers and other molecules, metal organic frameworks and layered double hydroxides have all been employed as carriers in novel magnetic nanocomposites. This review summarizes the most recent developments in this field, focussing on the potential application of magnetic nanocomposites as adsorbents for removing heavy metals from water. Critical gaps in the current literature are also identified, as much work is still required before magnetic nanocomposites may be readily applied in real world applications, including scale up of production and subsequent pilot investigations of water treatment in dynamic flow conditions. Heavy metal contamination of water resources is a serious global problem Much work has focused on developing magnetic nanocomposites as heavy metal adsorbents This work summarizes recent research efforts in this field Magnetic nanocomposites show great promise for heavy metal removal applications Scale-up and pilot studies are needed to bring their realization closer to fruition [ABSTRACT FROM AUTHOR]

In this study, we designed a platform based on a laser-driven approach for fast, efficient, and controllable MOF synthesis. The laser irradiation method was performed for the first time to synthesize Zn-based MOFs in record production time (approximately one hour) compared to all known MOF production methods with comparable morphology. In addition to well-known structural properties, we revealed that the obtained ZnMOFs have a novel optical response, including photoluminescence behavior in the visible range with nanosecond relaxation time, which is also supported by first-principles calculations. Additionally, photocatalytic degradation of methylene blue with ZnMOF was achieved, degrading the 10 ppm methylene blue (MB) solution 83% during 1 min of irradiation time. The application of laser technology can inspire the development of a novel and competent platform for a fast MOF fabrication process and extend the possible applications of MOFs to miniaturized optoelectronic and photonic devices. [ABSTRACT FROM AUTHOR]

[Display omitted] • Fe-based Metal-Organic Framework material (activated MIL-88A) efficiently removes various arsenic species in water. • Pseudo-second order kinetic model reveals chemisorption as the dominant mechanism. • Molecular shapes and sizes of arsenic species affect their adsorption rates to activated MIL-88A. • Activated MIL-88A shows high adsorption capabilities across a wide pH range. • Coordination and hydrogen bonding are the main mechanisms for arsenic adsorption. Arsenic in water environment can present significant threats to human health, and eliminating arsenic pollutants from wastewater is crucial. Based on our previously reported work, this study delved into the adsorption behavior and mechanism of different arsenic contaminants (p -ASA, ROX, As(V), and DMA) on the activated Fe-based metal–organic framework (activated MIL-88A). The results show that activated MIL-88A exhibits exceptional adsorption capabilities toward diverse arsenic pollutants. The adsorption process is endothermic, spontaneous, and viable, and chemical adsorption plays a leading role. The remarkable adsorption capacity of activated MIL-88A to various arsenic pollutants is primarily attributed to coordination, while hydrogen bonding also assumes a significant role in the elimination of p -ASA and ROX. Additionally, we investigated the impact of arsenic molecule shape and size, solution pH, and the existence of specific anions and dissolved organic matter (DOM) on the adsorption of different arsenic pollutants. This study can provide valuable insights for further exploring the selective adsorption of different kinds of arsenic species by Fe-based MOF materials and improving the adsorption efficiency of MOFs. [ABSTRACT FROM AUTHOR]

Adsorption of volatile gasoline components at oil terminal by using metal organic frameworks (MOFs) is a prospective technology in reducing environment pollution and increasing oil resource recovery. In this study, a typical MOF of HKUST‐1 was facile prepared by solvothermal method and tested in the adsorption of volatile gasoline components. Isobutylene was selected as a model compound. The effects of preparation parameters Cu2+/H3BTC molar ratios, Cu2+ precursors, and solvent compositions on the structure of HKUST‐1 and its subsequent adsorption performance were systematically studied. The synthesized samples were characterized by XRD, SEM, and N2 physisorption. It was found that the HKUST‐1 prepared by using DMF as the unique solvent obtained the highest specific surface area (1076.7 m2/g) and the largest pore volume (0.90 cm3/g). Furthermore, the maximum isobutylene adsorption capacity of 31.9 mg/g was found on the HKUST‐1 which prepared under the conditions of Cu2+/H3BTC = 2, Cu (CH3COO)2 as the Cu2+ precursor, and a solvent composition of DMF:EtOH:H2O = 0:4:3. [ABSTRACT FROM AUTHOR]

In the present paper, a Cu(BDC) metal–organic framework (MOF) is chemically attached to wool via an in-situ synthesizing method. The synthesized novel biocomposite (Cu(BDC)@Wool) was applied as an easily applicable biocomposite to the effective removal of Rifampicin (RIF) from wastewater. Batch adsorption experiments were performed, and the optimum conditions of RIF adsorption (99.3%) were found to be approximately at 25 ppm initial concentration, 1 mg adsorbent, pH 2, time without ultrasonic = 30 min, and time with ultrasonic = 10 which were determined by a response surface methodology. The results of fixed bed experiments showed that better RIF removal was achieved with a low inlet RIF concentration, high adsorbent bed height, and low influent flow rate. The performance of FBAC was maximum (tb = 769, te = 1221 min; %A = 60.6%) at a flow rate of 0.5 mL/min, adsorbent bed height of 7.5 mm, and RIF of 30 ppm. The study of mathematical models shows that the Clark model has the highest correlation with the experimental data. Therefore, the novelty of this work is that ultrasound-assisted removal reduces the equilibration time and can be economically viable for removing RIF from wastewater. [ABSTRACT FROM AUTHOR]

Based on the stable Zr6O4(OH)4 metal clusters, UiO-67 was first applied to the adsorption of U(VI), and its stability and adsorption performance for U(VI) were compared with UiO-66. As the organic ligand was lengthened, UiO-67 had a larger specific surface area and pore volume than UiO-66. The adsorption capacity of UiO-67 for uranium was 1.68 times that of UiO-66 under the same conditions. The chemical stability of UiO series decreased with the extension of organic ligands; for example, the crystalline structure of UiO-67 disintegrated in methanol, ethanol and water. Through the infrared spectra, adsorption isotherms and kinetics fitting, it is concluded that the carboxyl groups of UiO-67 participated in the chemisorption of U(VI), and uranyl ions adsorbed on UiO-67 were not desorbed with the collapse of UiO-67 crystal. This work represents the extension of organic chains reduces the chemical stability of MOFs but improves the adsorption performance of U(VI), which may be applied to predict the structural stability and adsorption capacity of other MOFs containing aromatic dicarboxylate organic linkers. [ABSTRACT FROM AUTHOR]

Clean water quality is dependent on the absence or complete removal of polar ionic micropollutant molecules and their associated products from the water. Utilizing copper Isonicotinate metal–organic frameworks ([Cu (INA)-MOF) a modified copper-based magnetic composite metal–organic framework ([Cu (INA)2]-MOF@Fe3O4) is mechanically synthesized under environmentally friendly conditions, and an adsorptive removal of salbutamol in water was successfully achieved in both synthesized materials. Characterization toward the materials has been carried out using X-ray diffraction, Brunauer–Emmett–Teller, field emission scanning microscopy, scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy. Our synthesized ([Cu (INA)2]-MOF@Fe3O4 used as an adsorbent in water showed enhanced performance in the removal of the model salbutamol within a shorter contact time (40 min) with the pseudo-second-order and Langmuir models providing the most accurate statistical descriptions of the process's kinetics and isotherms, respectively, while thermodynamic studies indicated that the process was endothermic, spontaneous, and the material demonstrated very good reusability and regeneration with a very good percentage recovery even after the fifth cycle. [ABSTRACT FROM AUTHOR]

[Display omitted] A high surface area (883 m2·g−1) nanocomposite composed of an amine-functionalized metal–organic framework (NH 2 -UiO-66 (U6N)) and manganese dioxide (MnO 2 @U6N) was prepared as bifunctional adsorbent-catalyst for the purification of multiple aromatic volatile organic compounds (VOCs) such as benzene (B), toluene (T), m-xylene (X), and styrene (S), i.e., BTXS. The performance of MnO 2 @U6N was assessed for BTXS removal both as single- and multi-component systems at room temperature (RT (20 °C)) under dark conditions. MnO 2 @U6N exhibited superior catalytic-adsorption activity for the RT removal of BTXS. The removal performance of MnO 2 @U6N against BTXS was then assessed across varying levels of flow rate, VOC concentration, adsorbent/catalyst mass, and relative humidity. To better understand the catalytic-adsorption activity, two types of non-linear kinetic models (pseudo-first-order and pseudo-second-order) were utilized to simulate the experimentally obtained data. In-situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) analysis was also conducted to interpret the removal mechanism of BTXS. Their adsorption capacity (mg·g−1) values are estimated to increase in the order of B (21.1) < T (66.0) < X (79.1) < S (129.7). It is suggested that the adsorbed aromatic VOC molecules on the surface of MnO 2 @U6N should react with active oxygen species (lattice and adsorbed oxygen) to yield the environmentally benigh end products (i.e., carbon dioxide and water) along with various intermediates (e.g., alkoxides, aldehydes, phenolates, carboxylates, and anhydrides). Accordingly, the VOC removal potential of MnO 2 @U6N has been validated through the synergistic combination between adsorption (primary process) and catalysis (subordinate process) at RT. [ABSTRACT FROM AUTHOR]

[Display omitted] The rapid development of process technology has led to rapid daily industrial production, which also produced a large amount of waste liquid. At the same time, the existing treatment technology cannot keep up with the demand, resulting in the malicious destruction of the environment by wastewater, especially mercury-containing wastewater was very harmful. Effective means of removing mercury ions need to be found. With magnetic ferric oxide as the core and titanium-based metal–organic frameworks as the shell, a new type of magnetic adsorbent (BTA-MIL-125(Ti)@Fe 3 O 4) was synthesized. Materials were tested by multiple characterization methods and multiple sets of experiments. At optimal pH 6, the removal rate in 100 ppm Hg(Ⅱ) was as high as 95.8%. The theoretical adsorption capacity was 615 mg/L. Isothermal experiments, kinetic experiments and thermodynamic experiments have respectively verified that the material was a kind of adsorption material with self-emission heat based on chemical action and synergistic adsorption with Hill model. By simulating the immunity of a variety of ions (Cu, Zn, Mg, Ni, Cd), the material itself also exhibited a very high affinity for Hg(Ⅱ). The results of five high-cycle stable adsorption proved the repeatable stability of the material itself. Various characterization methods have also shown that nitrogen and sulfur-containing groups chelated with Hg(Ⅱ). All of the above was enough to show that the BTA-MIL-125(Ti)@Fe 3 O 4 was a magnetic adsorption material with excellent performance and great prospects. [ABSTRACT FROM AUTHOR]

Comprehensive Summary: Exploring the physiochemical properties and expanding the applications of actinide‐containing materials is paramount to address the escalating challenge of radioactive waste accumulation. However, unlocking the full potential of these materials is largely crippled by the radiotoxicity of the actinides. We report here two porous and luminescent thorium‐based metal‐organic frameworks (Th‐BITD‐1 and Th‐BITD‐2) that serve as a bifunctional platform for sequencing and sensing of radioiodine, a much more radioactive fission product discharged during the nuclear fuel reprocessing. In particular, Th‐BITD‐1 displays better iodine uptake performance than Th‐BITD‐2 via the solution‐based process and vapor diffusion with the maximum adsorption capacities of 831 and 1099 mg/g, respectively. Furthermore, Th‐BITD‐1 can function as a highly sensitive luminescence sensor for iodate with a quenching constant (KSV) of 6.6(5) × 103 M−1 and a detection limit of 2.02 μM, respectively, outperforming 2.96(6) × 103 M−1 and 10.5 μM of Th‐BITD‐2. Moreover, a positive correlation between the sensing efficacy and the iodate adsorption capacity has been revealed. This work highlights the opportunity in designing novel actinide‐based MOFs for their potential applications in radiological fields, e.g., radionuclide separation and detection. [ABSTRACT FROM AUTHOR]

Extensive use of imidacloprid in pest control and its unfavourable removal efficiency has resulted contamination of aquatic environments. Herein, 4,4ʹ-methylenedianiline nano-polymer (MDANP) as organic linkers and Cu, Fe, and Al as metal sources were used to synthesise several metal-organic frameworks (MOFs) nanomaterials. Three MOFs (MDANP/Cu, MDANP/Fe, and MDANP/Al) were synthesised by the electrochemical polymerisation method and used as a nano-adsorbent to remove imidacloprid from the aqueous environment. Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), transient electron microscopy (TEM), and Field-scattering scanning electron microscopy (FE-SEM) techniques were used to analyse physicochemical characteristics of produced MDANP and MOFs. Kinetic data have been fitted with pseudo-second-order models; according to the obtained correlation coefficients (R2 = 0.9993). Adsorption isotherm models suggested that except imidacloprid adsorption on MDANP, which was best explained by the Freundlich model (R2 = 0.9018), pesticide adsorption from MOFs was well explained by the Langmuir model (R2 = 0.9473). The removal efficiency of imidacloprid onto MDANP and MOFs decreased from 65.28% to 40.25% and from 61.56% to 36.89%, respectively, as the initial concentration of imidacloprid increased from 25 to 400 mg/L. The results showed that the highest adsorption of imidacloprid happens within 120 min for 150 mg of adsorbent. Under optimum conditions, a maximum adsorption capacity of 97.4 mg/g occurred. Thus, MDANP and MOFs have medium potential for environmental implications and can be exploited as nano-adsorbents of imidacloprid pesticides in aquatic environments. [ABSTRACT FROM AUTHOR]

Contamination of water bodies by emerging pollutants such as β‐blockers has been a global concern over the past few years. This is due to the bioaccumulative character of β‐blockers in the aquatic systems, and their excessive usage might cause adverse effects on both humans and aquatic biota. A reusable and recyclable magnetic chromium‐based MIL‐101 (Fe3O4@MIL‐101(Cr)) nanocomposite was used as an adsorbent for the removal of the selected β‐blockers (acebutolol and metoprolol) from wastewater. The nanocomposite's structural, magnetic and surface properties were confirmed using various characterisation techniques. The equilibrium data indicated that the maximum adsorption capacities of Fe3O4@MIL‐101(Cr) for acebutolol and metoprolol were 30.9 mg g−1 and 28.3 mg g−1, respectively. The isotherm and kinetic experimental data best fitted Langmuir isotherm and pseudo‐second‐order kinetics models. Obtained free energies using the Dubinin‐Radushkevich model were above 8 kJ mol−1, demonstrating that the interaction mechanism between β‐blockers and the Fe3O4@MIL‐101(Cr) nanocomposite was chemisorption. The prepared nanocomposite was then used to remove β‐blockers from real samples, and maximum removal efficiencies (94.1–97.1 %) were obtained in the presence of co‐existing species. The Fe3O4@MIL‐101(Cr) hybrid showed great potential for efficient and facile removal of β‐blockers from river water, effluent and influent wastewater samples. [ABSTRACT FROM AUTHOR]

Contamination of water with heavy metals being discharged from several industrial activities has been gaining serious concern from quite a long time. Lead (Pb) is one of the highly toxic and harmful heavy metal that is present in high concentration in contaminated water. Several adsorption techniques have been investigated both using chemical and biological methods. The adsorption of Pb (II) ions was found to be affected by solution pH, contact time, adsorbent dosage, initial metal ion concentration, and temperature. This study compares different chemical and biological methods for lead ion removal based on their properties and adsorption capacity. It is found that the chemical adsorption is quite efficient and chemical adsorbents have a higher removal percentage and adsorption capacity than the biological methods. Among the chemical methods, metal organic frameworks (MOFs) exhibit the highest metal adsorption capacity of 909 mg.g−1 due to their large surface area and high porosity. The ongoing and future research aims at minimising the contamination of wastewater from heavy metals and metal organic frameworks contain the potential to build the gap. [ABSTRACT FROM AUTHOR]

One of the iconic characteristics of metal‐organic frameworks (MOFs) is the possesssion of guest‐accessible pores. Increasing pore size has a direct and often beneficial impact on a MOF's adsorption and separation properties. However, as pore size increases, the resulting void spaces are often filled by interpenetrated frameworks, where one or more networks crystallize within the pore system of another identical network, reducing the MOF's free volume and pore size. Furthermore, due to the thermodynamic favorability of interpenetration during solvothermal synthesis, techniques to synthetically differentiate interpenetrated from non‐interpenetrated MOFs are paramount. This study reports the synthesis of deinterpenetrated IRMOF‐9 via halide mediated deinterpenetrative conversion of Zn4O‐derived IRMOF‐9. IRMOF‐9, when treated with ethylammonium bromide, is quasi‐selectively etched, revealing the non‐interpenetrated analogue, IRMOF‐10 (deinterpenetrated IRMOF‐9), which can be isolated prior to complete dissolution by the bromide solution. Dye adsorption, surface area and pore size distribution analysis, and powder X‐ray diffraction are consistent with successful deinterpenetration. [ABSTRACT FROM AUTHOR]

Porous metal organic framework (TMU-10) has been fabricated via solvothermal method. The TMU-10 was further post synthetically modified to TMU-10@GO hybrids with graphene oxide (GO). The prepared TMU-10@GO hybrids were used as an effective adsorbent to removal of phenol in environmental water samples. The TMU-10@GO hybrids adsorbent was characterised by X-ray diffraction (XRD), infrared Fourier transform spectrometer (FTIR), and scanning electron microscopy (SEM), EDX. The influence of different parameters including pH, amount of adsorbent, salt additive and contact times were studied. Using the phenol experiment to evaluate the adsorption performance, TMU-10@GO hybrids displayed better adsorption capacity towards phenol, compared with TMU-10.The results showed that the phenol adsorption obeyed the pseudo-second-order kinetic and the Langmuir isotherm with the experimental adsorption data. The maximum adsorption capacity of phenol with TMU-10@GO adsorbent was 212.76 mgg-1.TMU-10@GO hybrids was suggested as a promising adsorbent for the removal of phenol from water, based on the remarkably high adsorption capacity and rapid adsorption. [ABSTRACT FROM AUTHOR]

Mismanagement of plastic waste results in its ubiquitous presence in the environment. Despite being durable and persistent materials, plastics are reduced by weathering phenomena into debris with a particle size down to nanometers. The fate and ecotoxicological effects of these solid micropollutants are not fully understood yet, but they are raising increasing concerns for the environment and people's health. Even if different current technologies have the potential to remove plastic particles, the efficiency of these processes is modest, especially for nanoparticles. Metal-organic frameworks (MOFs) are crystalline nano-porous materials with unique properties, have unique properties, such as strong coordination bonds, large and robustus porous structures, high accessible surface areas and adsorption capacity, which make them suitable adsorbent materials for micropollutants. This review examines the preliminary results reported in literature indicating that MOFs are promising adsorbents for the removal of plastic particles from water, especially when MOFs are integrated in porous composite materials or membranes, where they are able to assure high removal efficiency, superior water flux and antifouling properties, even in the presence of other dissolved co-pollutants. Moreover, a recent trend for the alternative preparation of MOFs starting from plastic waste, especially polyethylene terephthalate, as a sustainable source of organic linkers is also reviewed, as it represents a promising route for mitigating the impact of the costs deriving from the widescale MOFs production and application. This connubial between MOFs and plastic has the potential to contribute at implementing a more effective waste management and the circular economy principles in the polymer life cycle. [ABSTRACT FROM AUTHOR]

[Display omitted] In the context of industrialization and severe wastewater pollution, mercury ions pose a major threat due to their high toxicity. However, traditional adsorbents and common metal-organic framework (MOF) materials have limited effectiveness. This study focuses on combining magnetic materials with functionalized titanium-based MOF composite (SNN-MIL-125(Ti)@Fe 3 O 4) to improve mercury ion adsorption. Through comprehensive characterization and analysis, the adsorption performance and mechanism of the material were studied. The optimal adsorption of the material was achieved at pH 5, exhibiting a pseudo-second-order adsorption model and the Hill theoretical capacity of 668.98 mg/g. Hill and Tempkin models confirmed the presence of chemical and physical adsorption sites on the material surface. Thermodynamic experiments showed a spontaneous endothermic process. Despite the presence of interfering ions, the material exhibited high selectivity for mercury ions. After four cycles, adsorption performance decreased by only 8%, indicating excellent reusability. Nitrogen- and sulfur-containing functional groups played a key role in mercury ion adsorption. In conclusion, SNN-MIL-125(Ti)@Fe 3 O 4 , as a magnetic MOF adsorption material, showed potential for effective remediation of mercury-contaminated wastewater. This study contributes to the development of efficient adsorption materials and enhances the understanding of their mechanism. [ABSTRACT FROM AUTHOR]

[Display omitted] • Defective MIL-68(Al) was synthesized from waste PET plastic bottles. • d -MIL-68(Al) can remove nearly 97% of DMZ (C 0 = 100 mg L−1) in the first 10 s. • d -MIL-68(Al) exhibits the record adsorption kinetic constant of 2.84 g mg−1 min−1. • The DMZ adsorption capacity of d -MIL-68(Al) is 3 times of MIL-68(Al). • Defects in d -MIL-68(Al) create more active sites and promote mass transfer. In order to alleviate the pressure on the ecological environment and human health caused by wastewater of nitroimidazole antibiotics and poly(ethylene terephthalate) (PET) plastic waste, we propose a strategy of using defective MIL-68(Al) (d -MIL-68(Al)) derived from waste PET plastic for dimetridazole (DMZ) capture. The resulting d -MIL-68(Al) exhibits an excellent adsorption capacity of 555.6 mg g−1, which is three times of pristine MIL-68(Al) (181.8 mg g−1), demonstrating that the defective structures in d -MIL-68(Al) play a crucial role in the adsorption process. Remarkably, d -MIL-68(Al) can remove nearly 97% of DMZ in the first 10 s, and the removal efficiency reached 99% after adsorption equilibrium, affording a record kinetic rate constant k 2 (2.84 g mg−1 min−1). In short, d -MIL-68(Al) possesses both an ultrafast adsorption rate and outstanding adsorption capacity toward DMZ compared with reported adsorbents. Mechanism analysis reveals that the excellent DMZ adsorption performances can be ascribed to the abundant active sites caused by defective structures, as well as the π-π stacking and hydrogen bonding interactions between MOF and DMZ. Hence, d -MIL-68(Al) derived from waste PET plastic is an efficient porous adsorbent for rapid DMZ removal, which not only possesses great potential for wastewater treatment, but also reduces the harmful PET plastic waste, reflecting the concept of sustainable development. [ABSTRACT FROM AUTHOR]

[Display omitted] Composite materials HKUST-1@MCM-41 and HKUST-1@ BPS based on metal–organic framework HKUST-1 [Cu 3 (btc) 2 , btc = benzene-1,3,5-tricarboxylate] and silicas, i.e. , mesoporous MCM-41 and biporous BPS with a bimodal mesopore size distribution, were prepared by one-step direct growth technique. Methane and ethane adsorption isotherms were measured for the HKUST-1@MCM-41 and HKUST-1@BPS composites in a wide pressure range for the first time. The silica porous structure significantly affects the content and location of HKUST-1 crystallites in these host matrices, and thereby the adsorption selectivities of the composites. [ABSTRACT FROM AUTHOR]

A new metal-organic framework (MOF) [Co3(btdc)3(5,5′-dmbpy)2] • 5DMF (1) (H2btdc is 2,2′-bithiophene-5,5′-dicarboxylic acid and 5,5′-dmbpy is 5,5′-dimethyl-2,2′-bipyridyl) was synthesized. Compound 1 contains trinuclear secondary building blocks connected to each other by the btdc2− ligand to form a layered coordination polymer with a free accessible volume of 36%. [ABSTRACT FROM AUTHOR]

Recent experiments show that the diffusivities of C8 and C10 n‐alkanes in ZIF‐8 are higher than those of C7 and C9, respectively. We investigated this unusual 'odd‐even' effect by simulating the adsorption of C7‐C14 n‐alkanes in ZIF‐8 using hybrid Monte Carlo molecular simulations. The resultant adsorption isotherms, guest‐host energies, isosteric heats, and chain length distributions are analyzed for trends among the n‐alkanes. ZIF‐8 cages filled with n‐alkanes are characterized using a combination of image processing and data science to quantify the differences in packing that occur with chain length. Results indicate that packing changes drastically from C7 to C8 and from C9 to C10, which is consistent with the diffusion trends previously reported in experiments. [ABSTRACT FROM AUTHOR]

Capturing and converting CO2 through artificial photosynthesis using photoactive, porous materials is a promising approach for addressing increasing CO2 concentrations. Porphyrinic Zr‐based metal‐organic frameworks (MOFs) are of particular interest as they incorporate a photosensitizer in the porous structure. Herein, the initial step of the artificial photosynthesis is studied: CO2 sorption and activation in the presence of water. A combined vibrational and visible spectroscopic approach was used to monitor the adsorption of CO2 into PCN‐222 and PCN‐223 MOFs, and the photophysical changes of the porphyrinic linker as a function of water concentration. A shift in CO2 sorption site and bending of the porphyrin macrocycle in response to humidity was observed, and CO2/H2O competition experiments revealed that the exchange of CO2 with H2O is pore‐size dependent. Therefore, humidity and pore‐size can be used to tune CO2 sorption, CO2 capacity, and light harvesting in porphyrinic MOFs, which are key factors for CO2 photoreduction. [ABSTRACT FROM AUTHOR]