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With the development of science and technology, the application of the Internet of Things (IOT) is becoming more and more widespread. Applying BP neural network algorithms (NNA) to the IOT system will help improve the performance of the IOT system. The research purpose of this paper is to solve the problems of long-parameter measurement cycle and untimely feedback of the existing IOT online measurement system. In this paper, a multi-parameter (MP) IOT online measurement system based on BP NNA is designed, and a simulation test experiment is performed. The MP online measurement IOT system based on the BP NNA completes the parameter collection, analysis, and display through the perception layer, network transmission layer, and application layer. The core is that the system application layer adds the BP NNA to optimize real-time acquisition parameters, processing to reduce parameter measurement time. It can be known from algorithm simulation experiments that the online measurement system based on the BP NNA proposed in this paper uses the BP NNA to predict the absolute error value of the final moisture content and the measured moisture content within 0.3, and the absolute error of the moisture content value in actual production. It is acceptable in the range of 0.5, which speeds up data collection time. This system has a very good effect on improving the feedback adjustment speed of the manufacturing process system. [ABSTRACT FROM AUTHOR]

Graphical abstract The photocatalytic NO removal mechanisms of BiOBr/BiOI-U changed from the nonselective oxidation process to selective oxidation process. These two processes supported the 57% of NO removal of the BiOBr/BiOI-U. Highlights • Ultrathin BiOBr/BiOI photocatalyst was prepared. • BiOBr/BiOI showed high photocatalytic efficiency for NO removal. • Photocatalytic mechanism was changed after NO 3 − adsorption. Abstract Improved photocatalytic NO removal of photocatalysts requires enhanced carrier photocatalysis for more reactive species generation. Ultrathin structural BiOBr/BiOI (BiOBr/BiOI-U) photocatalyst was in-situ prepared and it showed enhanced photocatalytic efficiency for NO removal. The underlying photocatalytic process is divided into two steps: in the first step, NO 3 – was produced in a nonselective oxidation process. The increased NO 3 – concentration induces NO 3 – adsorption on the surface oxygen vacancies of the photocatalyst in the second step, which changed the surface environment of the ultrathin BiOBr/BiOI photocatalyst. During this process, the nonselective oxidation process turned into a selective oxidation process with NO 2 as the main product. In addition, the main photogenerated reactive oxygen species contributed to NO removal. Furthermore, the photocatalytic mechanism of BiOBr/BiOI-U was explored. [ABSTRACT FROM AUTHOR]

Waste drilling mud (WDM) is a hazardous and refractory waste generated during the exploration of oil and gas fields. WDM has high chemical oxygen demand (COD) and high salinity, making it difficult to handle WDM. In this study, WDM was treated under subcritical conditions without and with hydrogen peroxide (H 2 O 2) or potassium persulfate (K 2 S 2 O 8). The removal efficiency of COD Cr (COD was measured by potassium dichromate method) reached 98.20% ~.99.6%. The contents of twelve heavy metals in liquid products were lower than the emission limit except for arsenic. But arsenic concentration decreased by 65.25%. Those detected heavy metals were almost completely removed into solid products. In addition, after introducing K 2 S 2 O 8 as an oxidant, the removal efficiency of total organic carbon (TOC) in the liquid increased by 58.34% and 13.43% compared with additive-free and H 2 O 2 , respectively. The removal efficiency of total nitrogen (TN) was the same as above, also increased by 70% and 59.26%, respectively. The results showed that the introduction of K 2 S 2 O 8 was more effective in treating WDM under subcritical conditions. Moreover, the introduction of K 2 S 2 O 8 can generate sulfate ions. Sulfate ions can form stable metal salts with lead and barium, which was conducive to the immobilization of heavy metals. This study provides a new way for the harmless treatment of WDM, and also further expands the application scope of subcritical oxidation. [Display omitted] [ABSTRACT FROM AUTHOR]

In this paper, we analyze the potential factors affecting the hydrogen sulfide type of stress corrosion cracking in C110 casing pipes. In order to further study these cracking factors, the methods of material property testing, scanning electron microscopy, XRD, TEM, and 3D ultra-depth-of-field were applied in the experiments. Besides that, an HTHP autoclave was independently designed by the laboratory to simulate the actual corrosion environment, and the potential factors affecting the stress corrosion cracking of C110 casing pipes were determined. The test results showed that the chemical composition, metallographic structure, hardness, and non-metallic inclusions of the two types of C110 casing pipes were all qualified. In fact, there remains a risk of stress corrosion cracking when the two kinds of C110 casing pipes serve under long-term field-working conditions. It is considered in this paper that the precipitates on the material surface, stress damage, and pitting corrosion are all critical factors affecting the stress corrosion cracking of casing pipes. [ABSTRACT FROM AUTHOR]

The production of abundant free radicals and the effective separation of photo-induced carriers are considered challenging by researchers for the application of photocatalytic technology in the field of wastewater purification and environmental remediation. Herein, we successfully synthesized a novel S-MIL-101(Fe)@CQD composite via multi-step synthetic routes involving a simple solvothermal synthesis method and annealing treatment process to remove both Cr6+ and dyes in wastewater. A series of characterization methods and photocatalytic property tests were performed, proving that the synthesized S-MIL-101(Fe)@CQDs exhibited higher photocatalytic activity than MIL-101(Fe), which is mainly due to the formation of an intramolecular energy level and modulation of the intrinsic electronic properties of the MOF, where the CQDs act as an electron acceptor. We proposed the underlying photocatalytic mechanism through trapping experiments of the active species. Also, we performed several typical pollutant degradation experiments and confirmed the wide applicability of this composite. In summary, this work provides new insight into the construction of modified MOFs for the efficient removal of toxic pollutants from water. [ABSTRACT FROM AUTHOR]

Faced with severe corrosion of casing in oil wells, the epoxy coating was applied to prevent corrosion. Based on the mechanism that the filler eliminated the internal stress during the curing process of the coating and prevented the penetration of corrosive medium into the coating, a new filler was successfully prepared by the hydrothermal method. When the molar ratio of the precursor of ZrO 2 to MoS 2 was 1.2:1, MoS 2 was uniformly modified with ZrO 2 through mussel inspired chemistry of dopamine. Introducing fillers into epoxy coatings, specifically, a proper content of 0.8 wt.% filler can greatly improve the mechanical properties and corrosion resistance of the coatings. The coating maintained the excellent corrosion resistance for 16 h under high temperature (108 °C) and high pressure (pressurized with CO 2 gas of 35 MPa), which would provide us a reliable anticorrosive coating for oil wells metal casing. [ABSTRACT FROM AUTHOR]

• MoS 2 hybrid materials were prepared through bio-inspired methods. • MoS 2 hybrid materials were successfully introduced to the epoxy coating. • An effective method for enhancing anticorrosion of epoxy coating was reported. Epoxy coatings play an important role in preventing the corrosive medium penetrating into the base metal, but improving its durability in harsh environments is still a challenge. Nanomaterial introduced in epoxy coatings is an effective improvement measure, especially, the use of two-dimensional nanomaterial can effectively block the corrosion medium. In this paper, we use two-dimensional molybdenum disulfide (MoS 2) hybrid materials as nanofiller to improve the corrosion resistance of epoxy coatings. MoS 2 hybrid materials were obtained by an effective method based on self-oxidation of dopamine and functionalized silane (KH560) grafting. The poly(dopamine) and epoxy groups on the surface of MoS 2 enhanced the interaction with EP matrix. The anticorrosive performance of composite epoxy coating with the different content of MoS 2 hybrid materials was investigated in detail. An appropriate content (0.8 wt%) in the epoxy coating was obvious to improve its anti-corrosion performance. [ABSTRACT FROM AUTHOR]

The CO molecular ionization and Coulomb explosion are systematically investigated utilizing a high-resolution time-of-flight mass spectrometer. It is found that the main dissociation channels of highly charged CO 3 + , CO 4 + , and CO 5 + are (2,1), (2,2), and (3,2) respectively, i.e., the charge-symmetric dissociation channel, and their kinetic energy release keep constant with increasing the laser intensity. We obtain the contribution of different molecular states to the dissociation channel by Gaussian fitting the distribution of the channel's kinetic energy release. With the laser intensity of 1.0 × 10 15 W/ cm 2 , the angular distributions of CO x + ( x =2,3,4), which exhibit high anisotropy, are generated from these different dissociation channels. According to the present theory, we can qualitatively understand that the anisotropy depends on the molecular orbital profile. [ABSTRACT FROM AUTHOR]

Graphical abstract The both enhanced excition and carrier photocatalysis of BiOBr/BiOBr x I 1−x resulted efficient molecular oxygen activation for oilfield waste water treatment and organic pollutants (BPA, RhB and phenol) photodegradation. Highlights • # BiOBr x I 1−x /BiOBr heterostructure was in-situ synthesized. • # BiOBr x I 1−x /BiOBr showed effective activity for wastewater treatment. • # Exciton and carrier photocatalytic processes was found. Abstract The BiOBr x I 1−x /BiOBr heterojunction structural photocatalyst was constructed successfully in this work and it was formed by the BiOBr x I 1−x solid solution coupling with the BiOBr monomer, which was determined by efficient characterizations. For the photocatalytic property, The BiOBr x I 1−x /BiOBr could degrade some organic pollutants efficiently and the oilfield produced waste water treatment efficiency of it was ideal. The reason for its enhanced photocatalytic property was also explored. Through ESR tests, trapping experiments and other efficient methods, the enhanced molecular oxygen activation capacity of induced 1O 2 and O 2 − photogeneration by BiOBr x I 1−x solid solution structure and heterostructure in one photocatalyst was confirmed, respectively. This work provided a new thought for enhanced molecular oxygen activation capacity of bismuth oxyhalide photocatalysts. [ABSTRACT FROM AUTHOR]

Surface plasmon resonance (SPR) and Z-scheme bridge are the most important roles of noble metal nanoparticles for photocatalysis. In this study, the size-dependent role of gold (Au) in Au/g-C 3 N 4 /BiOBr system was studied for photocatalytic CO 2 reduction and dye degradation. The results revealed that big Au nanoparticles mainly displayed Z-scheme bridge role, and g-C 3 N 4 /BiOBr/Au-B showed higher photocatalytic activity than g-C 3 N 4 /BiOBr under 380 nm monochromatic light irradiation. Small Au nanoparticles mainly displayed SPR role, and g-C 3 N 4 /BiOBr/Au-S showed higher photocatalytic activity than g-C 3 N 4 /BiOBr under 550 nm monochromatic light irradiation. The size-dependent role of Au nanoparticles for photocatalytic system should be due to the SPR effect of small Au nanoparticles and electron transfer center of big Au nanoparticles. This finding can guide us to prepare high photocatalytic activity noble metal loaded photocatalysts. [ABSTRACT FROM AUTHOR]

Until now, BiOBr and BiOI are not used for photocatalytic H 2 evolution due to the positive CB position. In this work, bismuth-rich strategy is used to promote the CB position. Bi 4 O 5 X 2 (X = Br, I) nanosheets with dominant {1 0 1} facets exposure are synthesized by molecular precursors hydrolysis route. Bi 4 O 5 Br 2 and Bi 4 O 5 I 2 samples were characterized by X-ray diffraction patterns (XRD), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS) and photoelectrochemical measurements. Bi 4 O 5 Br 2 displays higher photocatalytic activity than Bi 4 O 5 I 2 for H 2 production. And the H 2 evolution rate of Bi 4 O 5 Br 2 reach 6.81 μmol h −1 with the apparent quantum efficiency of 0.93% at 420 nm. It is the first work to report photocatalytic H 2 production using Bi 4 O 5 X 2 photocatalysts. [ABSTRACT FROM AUTHOR]

In this work, an efficient Z-scheme heterojunction consisting of perovskite and iron-based metal-organic framework (N-BiFeO 3 /NH 2 -MIL-53(Fe)) composite was fabricated by in-situ growth. The catalyst accelerates the separation of photogenerated carriers and broadens the absorption range of visible light, and acts as a heterogeneous Fenton-like catalyst for the degradation of tetracycline hydrochloride (TC-H). The structure, composition, morphology and optical properties of the catalyst were comprehensively investigated. Photocatalytic experiments showed that the composite exhibited higher degradation efficiency (88%) compared with pure N-BiFeO 3 (40%) and pure Fe-MOF (71%). In addition, 99% of TC-H, 76% of ciprofloxacin, and 91% of sulfamethoxazole were degraded within 60 min under the visible light/N-BiFeO 3 /NH 2 -MIL-53(Fe)/H 2 O 2 system. The effects of catalyst dosage, coexisting ions and other factors on the degradation performance were investigated, and good stability was shown. The experiment of free radical scavenger proved that the production of hydroxyl radicals was the main active substance for the degradation of TC-H, which accelerated the Fe(II)/Fe(III) cycle and promoted the efficient degradation of TC-H, the possible mechanism of the degradation of TC-H by visible light/ N-BiFeO 3 /NH 2 -MIL-53(Fe) /H 2 O 2 system was discussed. Therefore, N-BiFeO 3 /NH 2 -MIL-53(Fe) can be used as an effective photocatalyst for the degradation of organic pollutants. [Display omitted] • Fabrication of visible light-driven N-BiFeO 3 /NH 2 -MIL-53(Fe) photocatalyst. • The efficient degradation of tetracycline hydrochloride (99%) in the presence of H 2 O 2. • Direct Z-scheme photocatalytic system promotes the separation efficiency of carriers. • The hydroxyl radicals are the main active species in the photocatalytic process. [ABSTRACT FROM AUTHOR]

A g-C3N4/NH2-MIL-88B(Fe)/CD@GO membrane (M2) was prepared by a simple vacuum filtration method. By embedding a Z-scheme heterojunction composite photocatalyst into graphene oxide (GO) nanosheets, not only can the water molecule transport channel be regulated, but the membrane can also be endowed with photocatalytic activity and membrane fouling is effectively alleviated. The pure water permeation flux of M2 (253.26 L m−2 h−1 bar−1) was 13 times that of the original GO membrane (18.83 L m−2 h−1 bar−1). What's more, even after 10 cycles, M2 still maintains excellent separation efficiency and flux. After six cycles, the rejection of Congo Red (CR), Malachite Green (MG) and Rhodamine B (RhB) by M2 was over 95%. At the same time, under the conditions of an extreme pH value and high salt concentration, the rejection of dye remained at the original level after six cycles. Therefore, the novel photocatalytic membrane has excellent separation performance, stability and photocatalytic activity, and can be used as a potential membrane for wastewater purification and environmental protection. [ABSTRACT FROM AUTHOR]

Utilization of self-healing coating is an efficient strategy for protecting metals from corrosion. However, rational design and synthesis of self-healing nanomaterial with excellent barrier property and high loading rate of corrosion inhibitor is still a challenge. Herein, the obvious physical barrier properties of graphene and the self-healing function of zeolite imidazole framework-8 (ZIF-8) was combined (RGO@ZIF) based on the concept of composite coating with "passive barrier" body and "active self-healing" guest. Herein, as a coordination complex, ZIF-8 can store and release inhibitors (2-methylimidazole) through the formation and cleavage of coordination bonds. Moreover, silica was supported on the ZIF surface (RGO@ZIF@SiO 2) to compensate for the negative impact of the remaining voids after ZIF decomposition on the barrier properties of the coatings. The UV–vis results proved that ZIF-8 displayed outstanding pH-responsive activities under acidic conditions, and the loading capacity was up to 63.0%. Therefore, ZIF-8 was proposed as a solid corrosion inhibitor, which is expected to provide a new way to improve the loading rate of inhibitors. The EIS results showed that the impedance values of ZIF/EP, RGO@ZIF/EP and RGO@ZIF@SiO 2 /EP composites coatings increased inversely with the prolongation of immersion time, attributing to their self-healing performance. Besides, the epoxy loaded 0.7% of RGO@ZIF@SiO 2 exhibited the higher impedance value than that of other samples in the whole immersion stage, which can be ascribed to the excellent barrier properties. Moreover, the corrosion products and bubbles on the surface of RGO@ZIF@SiO 2 /EP (0.7%) sample were the least after 200 h of exposure in salt spray test, further proving its best corrosion protection performance. [Display omitted] • ZIF as a solid corrosion inhibitor is uniformly loaded on the surface of RGO. • Silicon oxide shell can fill the holes left by the decomposition of ZIF. • The RGO@ZIF@SiO 2 hybrids exhibited high corrosion inhibitor loading rate. • The synergistic effect of ZIF@SiO 2 and RGO enhanced the anti-corrosion performance. [ABSTRACT FROM AUTHOR]

The energy distribution of the world is in a critical transition from traditional fossil fuel to new clean energy. Actually, the fuel cell is favored by researchers as an efficient and clean energy conversion equipment. The anion exchange membranes (AEMs) with excellent performance and long service life will become the development trend of alkaline fuel cells in the future. Compared with proton exchange membrane fuel cells (PEMFCs), its advantages of affordable price, work safety, and non-precious metal participation are widely favored by researchers. This paper reviews the performance of characteristics, synthesis methods, modification methods, and alkaline stability protection of anion-exchange polyelectrolytes (AEPs), and the current research and development status of AEPs used in AEMs are summarized. The evaluation and comparison of different types of AEPs and AEMs based on different AEPs are put forward. This review is expected to further deepen the understanding of AEPs in AEMFC. [Display omitted] • Multiple cations deserve further attention. • The influence of backbone on AEPs stability needs to be further explored. • The compatibility between backbone and cation may affect AEM properties. • Polymer structure design also affects the stability of AEMs. [ABSTRACT FROM AUTHOR]

[Display omitted] • The fluorinated units and the side chains induced microphase separation structure provide low resistance channels for ion conduction. • The effect of hydrophobic components on membrane properties was investigated. • High conductivity and alkali stability achieve simultaneous improvement. • The peak power density of the FPTBP-BMP-6C membrane reaches 264.2 mW cm−2. Currently, the trade-off between mechanical stability and electrical conductivity has become one of the challenges in developing high-performance anion exchange membranes. Here, we propose a fluorinated crosslinking strategy to improve the mechanical properties of the membrane while achieving high conductivity. The introduction of hydrophobic fluorination units provides a further driving force for the aggregation of hydrophilic ion clusters within the membrane, forming continuous ion transfer channels within the membrane. The results show that the crosslinked membranes maintain a low swelling rate as well as a high OH– conductivity at 80 °C. Among them, the FPTBP-TMA-7 membrane showed the most comprehensive performance, with a OH– conductivity of 116.9 mS cm−1 and a swelling rate of only 14.1% at 80 °C. The chemical structure of the membranes maintained high stability after immersion in highly concentrated alkaline solutions (2 M NaOH at 80 °C for 720 h), with a conductivity retention rate of over 91.8%. In addition, the FPTBP-TMA-7 based fuel cell achieves a peak power density of 264.2 mA cm−2 at 80 °C, showing an attractive application prospect in alkaline fuel cells. [ABSTRACT FROM AUTHOR]

[Display omitted] • Zwitterionic comb polymer/LDH composites (P-LDH) were prepared by in-situ polymerization. • P-LDH had two types of intercalation and exfoliation. • P-LDH had excellent filtration control of drilling fluid at 240 °C and 15 wt% NaCl. • P-LDH promoted the hydration and dispersion of bentonite and blocked the filter cake to reduce the filtration loss effectively. In deep-formation drilling, effective filter loss control in ultrahigh-temperature conditions and high-salt conditions faces challenges. Comb polymer/LDH composites (P-LDH) with partially intercalated and partially exfoliated structures were prepared by in-situ polymerization as fluid loss materials. A series of characterization results showed that the P-LDH composites were successfully synthesized. P-LDH had partially intercalated and partially exfoliated structures and excellent thermal stability. In addition, the rheological evaluation results showed that P-LDH had a low viscosity effect while maintaining the rheological properties of the drilling fluid. P-LDH can significantly reduce the filtrate loss of drilling fluids at ultrahigh temperatures and high salt concentrations. At 240 °C and 15 wt% NaCl, the filtration loss was only 6.3 mL, and the high-temperature and high-pressure filtration loss was only 29.6 mL. Through the analysis of drilling fluid particle size and filter cake microstructure, based on hydrogen, ionic bonds, and intercalation effects, P-LDH acted closely with bentonite to promote stable dispersion, improve the drilling fluid's stability, and form a dense filter cake to reduce the filtration loss. Therefore, P-LDH has broad application prospects in ultrahigh-temperature and high-salinity formation drilling. [ABSTRACT FROM AUTHOR]

Poly( para-dioxanone) (PPDO)-based composites have been prepared by blending PPDO with three different types of CaCO3 particles, CC1 (nano-CaCO3), CC2 (CaCO3 whisker), and CC3 (silane-coated CaCO3 whisker). The effects of particles size, interface adhesion, and crystallinity of composites on mechanical properties were discovered through analysis of the morphology of fracture surfaces, thermal characteristics, and crystalline structure. DSC revealed that the CaCO3 particles acted as a nucleating agent and promoted crystallinity of PPDO. The effect of CaCO3 particles on crystallization of PPDO was clearly revealed by using the nucleating efficiency. Smaller size particles exhibit greater nucleating efficiency. Adhesion between PPDO and the CaCO3 particles plays major roles on the mechanical properties of composites. The tensile strength of PPDO was improved over 54%. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

• Hollow PA (HOPA) with large capacity was prepared by sacrificial template method. • The loading rate of BTA was increased to 2.3 times of the original polyaniline. • Gr/HOPA/BTA@Cu hybrids possessed H+ ion-responsive inhibitor release property. • Gr/HOPA/BTA@Cu based composite coating exhibited long-term self-healing effect. In this research, the main aim is to take the advantages of both graphene (Gr) and polyaniline (PA) in enhancing the barrier property and self-healing performance of composite coating. Herein, hollow polyaniline (HOPA) was prepared by sacrificing template method, which not only acted as a dispersant to enhance the dispersion of Gr nanosheets via the π-π interactions, but also was used as a nano container for storing benzotriazole (BTA) corrosion inhibitor. In addition, insoluble Cu-BTA complex stoppers possessed H+ ion-responsive inhibitor release property. The final release concentration of BTA in Gr/HOPA carrier was as high as 274.55 ppm, which was about 2.3 times than that of PA (120.42 ppm) due to the formation of cavity structure. From the EIS results of intact coatings, the 0.7 % of Gr/HOPA/BTA@Cu loaded composite coating exhibited a remarkable corrosion protection capability after 130 days of immersion. And the scratch test indicates that the Gr/HOPA/BTA@Cu based composite coating showed more long-term self-healing effect than that of Gr/PA/BTA@Cu/epoxy sample, which was related to the high BTA loading rate in HOPA. [ABSTRACT FROM AUTHOR]

Understanding the appearance and maintenance of cooperation behavior is one of the most interesting challenges in natural and social sciences. Evolutionary game is a useful tool to study this issue. Here, we consider a basic strategy updating rule: the probability of a player updating its strategy is affected by the learning ability, which is determined by payoffs and an aspiration parameter w. For positive w , learning ability is directly proportional to player's own payoff. When w equals 0, it returns to traditional situation. It is found that increasing the value of w can promote the cooperation. With the increase of w , the player's learning ability is continuously enhanced, and the probability of changing strategies is also increased. This paper verifies the influence of the introduced selection parameter w on the cooperation rate from different aspects. We tested this hypothesis through the Monte Carlo simulation, and demonstrated that introducing w changed the network of interaction effectively, therefore changing the effect of the adoption of the strategy on the uncertainty of cooperation evolution. This paper analyzed the results of the payoff-dependence learning ability of different players when they imitate the strategies of their opponents, which can effectively promote the evolution of cooperation. [ABSTRACT FROM AUTHOR]

Tannic acid (TA), as a biodegradable corrosion inhibitor, was used to modify the graphene (Gr) for improving the water-dispersibility of Gr. Further, the polyaniline (PANI) was enwrapped on the vanadium pentoxide (V 2 O 5) surface to increase its conductivity, thus promoting rapid formation of passivation film. Besides, the PANI enwrapped vanadium pentoxide (PV) was self-assembled with the Gr-TA through π-π interaction. Then, the waterborne epoxy coating (WEC) filled with the Gr-TA@PV hybrids were prepared, and the corrosion protection performance of the nanocomposites WEC were investigated through electrochemical and salt spray tests. The results confirmed that the outstanding corrosion protection performance of Gr-TA@PV/WEC derived from the superior barrier property of Gr nanosheets for corrosion agents and its self-healing effect. The self-healing process includes the formation of TA-Fe-TA complex and a passive Fe 2 O 3 / Fe 3 O 4 layer at the interface of coating/substrate. Unlabelled Image • TA as a corrosion inhibitor was used to increase the dispersion of Gr in water. • PANI was enwrapped on the V 2 O 5 surface to increase its conductivity. • The Gr-TA and V 2 O 5 @PANI (PV) were self-assembled through π-π interaction. • The Gr-TA@PV/WEC exhibited superior barrier properties and self-healing effect. [ABSTRACT FROM AUTHOR]

Self-healing coatings, possessing an "active healing" ability to repair physical damage and to prolong the life of coating without external intervention, are of current interest. Herein, a novel self-healing coating, by using aspartic acid intercalated layered double hydroxide (AA-LDH) @ reduced graphene oxide (RGO) as filler within epoxy has been demonstrated. The corrosion protection performance and self-healing ability of composites coatings have been investigated via electrochemical impedance spectroscopy (EIS) and salt spray test. The AA-LDH@RGO/epoxy exhibits excellent corrosion resistance owing to the high barrier properties of RGO for corrosive ions. Moreover, the epoxy loaded with AA-LDH@RGO shows outstanding self-healing performance, attributing to the release of AA from LDH on the basis of the ion exchange performance, thus leading to formation of AA-Fe-AA compounds at the coating/steel interface. The results clarified that the addition of AA-LDH@RGO increases the impedance of the epoxy resin from 6.437 × 106 to 2.112 × 109 Ω cm2, and effectively extends the epoxy coating failure time to 40 days. [ABSTRACT FROM AUTHOR]

As a backbone with ether-free for anion exchange membranes (AEMs) with good alkali stability, poly(aryl-co-aryl piperidine) (c-PAP) has received much attention in the development of polyelectrolytes. More importantly, the trade-off between high conductivity and stability has been a thorny issue for researchers in the study of AEMs. Typically, non-cationic crosslinked membranes have lower water absorption and swelling rates compared to multi-cationic crosslinked membranes, resulting in better dimensional stability of the membrane. Here, we designed a non-cationic crosslinked AEMs based on poly(p-terphenyl-co-1,2-diphenylethane piperidinium) (PDTP). The experimental results show that the combination of hydrophobic crosslinking and side chain induction results in excellent conductivity and alkali resistance of the membranes. The crosslinked membranes reached an OH- conductivity of 104.61 mS cm−1 and a swelling rate of less than 15 % at 80 °C. In addition, the length of the hydrophobic crosslinker was varied to explore its effect on the membrane properties. The PDTP-BMP-6 C membrane (C=6 in crosslinker) shows the most excellent overall performance among them. The conductivity was retained at 86.5 % after immersion in 2 M NaOH at 80 °C for 720 h, and the peak power density reached 214 mW cm−2. [Display omitted] • Crosslinked reinforced and side chain induced structures were successfully synthesized. • The effect of length of crosslinker on membrane properties was investigated. • High ionic conductivity and stability achieve synergistic improvement. • The peak power density of the PDTP-BMP-6 C membrane reaches 214 mW cm−2. [ABSTRACT FROM AUTHOR]

Bismuth oxyhalides (BiOX, X = Br, I) photocatalysts are rarely applied for photocatalytic reduction reaction withthe photo-induced electron, as this is impeded by their low conduction band. As a widely used approach for enhancing the photocatalytic reduction activity, bismuth-rich strategy results the bismuth content of BiOX photocatalysts increasing. In this paper, a solid solutions of bismuth-rich Bi 4 O 5 Br x I 2-x were prepared applying the molecular precursor method. Bi 4 O 5 Br x I 2-x were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), element mapping, Brunauer–Emmett–Teller surface analysis (BET), UV–vis diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The obtained photocatalytic data showed that Bi 4 O 5 Br x I 2-x solid solutions had higher photocatalytic activities than Bi 4 O 5 Br 2 and Bi 4 O 5 I 2 . At an optimal ratio of x = 1, the Bi 4 O 5 BrI photocatalyst showed the highest photocatalytic reduction activity for CO 2 conversion (22.85 μmol h −1 g −1 CO generation, AQE was 0.372 at 400 nm) and Cr(VI) removal (88%). CO 2 adsorption data and CO 2 temperature programmed desorption (CO 2 -TPD) revealed that Bi 4 O 5 BrI exhibited the highest chemical adsorption ability of CO 2 molecules Photocurrent and electrochemical impedance (EIS) spectroscopy demonstrated the enhanced photo-induced carrier separation efficiency of Bi 4 O 5 BrI. These mechanistic studies suggest that Bi 4 O 5 Br x I 2-x solid solutions are excellent photocatalysts for solar fuel generation and environmental remediation. [ABSTRACT FROM AUTHOR]

Heterojunction is an effectively construction to improve the photocatalytic activity due to the excellent photo-induced carrier separation efficiency. In this paper, g-C 3 N 4 /Bi 4 O 5 I 2 heterojunction was prepared and characterized by X-ray diffraction patterns (XRD), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic data showed that g-C 3 N 4 /Bi 4 O 5 I 2 heterojunction had higher activity than pure g-C 3 N 4 and Bi 4 O 5 I 2 . At an optimal ratio of 1.0 mol% (11.4 wt% of Bi 4 O 5 I 2 ), g-C 3 N 4 /Bi 4 O 5 I 2 photocatalyst showed the highest photocatalytic reduction activity for CO 2 conversion with 45.6 μmol h −1 g −1 CO generation. Photocurrent and electrochemical impedance (EIS) spectroscopy revealed that higher photo-induced carrier separation efficiency of g-C 3 N 4 /Bi 4 O 5 I 2 . Z-scheme charge transfer mode was proved by I 3 − /I − redox mediator existence and superoxide radical (O 2 − ) and hydroxyl radical ( OH) quantification experiments. [ABSTRACT FROM AUTHOR]

In the process of deep oil and gas drilling, high temperature and high amounts of salt will greatly deteriorate the rheological properties of water-based drilling fluids (WBDFs), increase the fluid loss of drilling fluids, and seriously threaten the safety of operations. It is urgent to develop new high-temperature and salt-resistant drilling fluid additives. In this study, a novel organic-inorganic polymer nanocomposite (P-RD') was synthesized by combining laponite and polymer, and its chemical structure and properties were characterized and evaluated by various experimental methods. The results show that P-RD' forms a spatial network structure in aqueous solution, and has good clay adsorption capacity and pore and crack sealing ability. At 180 °C and 15 wt% NaCl, it has good rheological stability to WBDFs, the American Petroleum Institute (API) filtration loss is only 7.1 mL, and the high temperature and high pressure (HTHP) filtration loss is controlled at 29.2 mL. P-RD' has dual functions, which can effectively strengthen the temperature and salt resistance of WBDFs, and is expected to be used as a rheology modifier and filtration loss reducer in high-temperature deep well drilling. [Display omitted] • Laponite-polymer composite has a firm spatial network structure. • The synergistic effect of inorganic nano-laponite and organic polymers promotes temperature and salt resistance. • Laponite-polymer composite has excellent rheological and filtration loss control ability at high temperature and high salt. • The mechanism of action is to enhance the hydration and dispersion performance, plug the pores and cracks. [ABSTRACT FROM AUTHOR]

Nowadays, oily wastewater is a severe threat to the living environment of humankind. In recent years, MOF materials have shown great application potential in membrane separation and treatment of oily wastewater. In this paper, the mixed cellulose ester membrane (MCEM) was modified by polydopamine, and the NH 2 -MIL-125 (Ti)/Sep(sepiolite)/PDA composite membrane was prepared by simple vacuum filtration. The composite membrane had super-hydrophilic performance and underwater super-oleophobic performance, and could effectively separate oil-water emulsion separation performance. Also, the composite membrane showed good repeatability. After 10 cycles, the retention rate of petroleum ether-in-water emulsion was still more than 99%, and the flux was more than 2000 L· m − 2 · h − 1 . Since strong adhesion ability of PDA and the covalent interaction between NH 2 -MIL-125(Ti) and Sep, the chemically stable NH 2 -MIL-125(Ti)/Sep/PDA composite membrane was exposed to the strong acid (pH=1), alkali (pH=11), and salt (5% saturated NaCl) solutions showed excellent chemically stable. These outstanding properties made the composite membrane have great potential in the removal of oily wastewater. [Display omitted] • The composite membrane has good chemical stability in pH = 1, pH = 11%, and 5%NaCl. • After 10 cycles, the separation rate of the oil/water emulsions was above 99%. • The composite membrane had a high-efficiency separation performance of oil-in-water emulsion. [ABSTRACT FROM AUTHOR]

Heavy metals in the water environment seriously threaten human health and the ecological environment. As an effective method for removing heavy metals in water, adsorption has attracted wide attention. Traditional LDHs materials are difficult to recover as adsorbents. This study provides a new type of adsorption material for Ni/Fe-LDH coated with sodium alginate(SA) synthesized by a simple hydrothermal method and treated with NaOH. Obtain the alkalized adsorption material alk-Ni/Fe-LDH-SA. It was characterized by SEM, XRD, FTIR, TGA and XPS, and its adsorption effect on Ni(II) and Cu(II) was studied. The experimental results show that the prepared Ni/Fe-LDH-SA adsorbent has an adsorption capacity of 182.8 mg/g for Ni2+ and 196.2 mg/g for Cu2+ at 25 ℃. It has good performance when pH ≥ 7, and after four cycles, the removal rate of the two ions remains above 80%. The analysis mechanism shows that the removal process is mainly through physical adsorption precipitation, electrostatic adsorption, ion exchange, and chelation. Compared with traditional adsorbents, the adsorbent prepared in this study is easy to be recycled and reused, and has potential application value to other heavy metal ions. It is a promising adsorbent material. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] • The new Schottky junction photocatalyst Ti 3 C 2 MXene/NH2-MIL-88B was prepared by solvothermal method. • The adsorption capacity of the composite material is more than 4 times that of the monomer material. • The photocatalytic rate of 10 mg composite materials is more than 6 times that of monomer materials on 50 ppm MB. • The composite material has adsorption photocatalytic degradation effect on a variety of dyes. Ti 3 C 2 MXene contains suitable elements that are effective for photocatalysis, but it is usually not directly used for photocatalysis, which hinders its application in photocatalytic water treatment. In this work, we used the solvothermal method to grow MOF (Fe) in situ on Ti 3 C 2 MXene to construct a composite schottky photocatalytic adsorbent. The morphology of the material is characterized by XRD, SEM, XPS, etc. The adsorption kinetic model and photocatalytic performance of the material were studied. The introduction of MXene avoids the agglomeration of MOF, increases the effective area of the composite material, and acts as a photo-generated electron trap in the photocatalytic process to enhance the charge separation efficiency of MOF. 10 mg composite material can remove more than 90% of MB (50 ppm) within 30 min, and remove 83.41% RhB (25 ppm) and 44.26% MO (20 ppm) within 120 min. In the case of a small amount of use, it shows good adsorption and photodegradation properties to a variety of dyes. Based on the experimental results, a dye removal mechanism based on adsorption performance and schottky knot synergistic Fenton effect is proposed. Its application can be used to eliminate and degrade pollutants in water. [ABSTRACT FROM AUTHOR]

Simultaneous removal of petroleum and dye pollutants posed a huge challenge to the development of membranes. NH 2 -MIL-125 was widely used in separation membranes, but so far had not been used for oil/water separation. We successfully prepared NH 2 -MIL-125@polyacrylic acid (referred to as NH 2 -MIL-125@PAA) composite membrane on the PVDF by vacuum-assisted self-assembly technology. Due to the introduction of a large number of hydrophilic nanoparticles on the PVDF, the composite membrane exhibited excellent hydrophilicity and underwater oleophobic properties. At the same time, the membrane could efficiently separate oil/water emulsions and dyes. After 10 cycles, the separation rate of the oil/water emulsions and the dye was above 99%, and the flux was above 400 L / m 2 ∙ h. Moreover, due to the successful cross-linking of PAA and NH2-MIL-125, the membrane had good stability. Therefore, the composite membrane in this study provided an idea for the removal of multi-component pollutants. [Display omitted] • For the first time, NH 2 -MIL-125 composite membrane was used to oil/water emulsions separate. • The composite membrane can remove both oil/water emulsion and dye simultaneously. • After 10 cycles, the separation rate of the oil/water emulsions and the dye was above 99%. [ABSTRACT FROM AUTHOR]

• NH 2 - and HO- functionalized ionic liquids (ILs) inhibit shale hydration excellently. • NH 2 - functionality was more favorable to shale inhibition than HO- functionality. • ILs in WBDs inhibit viscosity build-up at high temperatures. • ILs cause the filtration and inhibition failure of WBD without colloidal protection. • ILs inhibit shale hydration by minimizing crystalline and osmotic hydration of clay. Shale hydration is the main cause of wellbore instability during drilling using water-based drilling fluids (WBD). In this work, NH 2 - and HO-functionalized ionic liquids (ILs) were investigated for their performances on inhibiting the shale hydration, as well as their influences on the properties of WBD, using immersion and sedimentation tests, linear swelling test, hot-rolling dispersion test, rheological and filtration experiments. The mechanisms were identified by X-ray diffraction (XRD), zeta-potential and particle size distribution analyses, scanning electron microscopy (SEM) and related theoretical analysis. Evaluation experiment results showed that the NH 2 -functionalized IL had the best inhibition performance, followed by poly(propylene glycol)bis(2-aminopropyl ether), HO-functionalized IL and KCl. NH 2 -functionality was more favorable to shale inhibition than HO-functionality. When used in WBD, ILs could prevent viscosity building-up at high temperature, but cause filtration and inhibition failure, which could be mitigated when polyanionic cellulose (PAC) was added in WBD prior to inhibitors. Three critical observations helped elucidate the inhibitive mechanisms: the intercalation of cationic groups of ILs into the clay interlayers, the decrease of both interlayer spacing and double layer thickness. The NH 2 -functionalized IL allowed the smallest interlayer spacing and double layer thickness and therefore performed best in inhibition. The inhibition failure in WBD with ILs depended on two aspects: the consumption of ILs untimely and the filtration failure of WBD. PAC could decrease both of ILs' loss within WBD and water loss toward shale, mitigating the WBD's inhibition failure. Our work will facilitate the rational design of efficient and environmentally acceptable inhibitors and their rational applications in WBD for drilling shale formation. [ABSTRACT FROM AUTHOR]