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[Display omitted] • Cellulose was used as dispersant of ZIF-8 to prepare the efficient and environmentally friendly aerogel adsorbent. • ZCCA showed irregular network structure, which was uniformly filled with particles. • ZCCA showed an excellent adsorption performance, and the maximum adsorption capacity of Cu(II) reached 270.2 mg·g-1 at 303 K. • ZCCA also demonstrated stable recyclability after 5 adsorption-desorption cycles and the removal of Cu(II) still remained 83%. • The main adsorption mechanism is complexation and electrostatic attraction. A novel adsorbent (ZIF-8 cattail cellulose aerogel, ZCCA) with excellent adsorption performance was prepared using cellulose as a dispersant of ZIF-8 and applied to Cu(II) removal from wastewater. ZCCA showed an irregular network structure, which was uniformly filled with ZIF-8 particles. Its adsorption mechanism was the electrostatic attraction and chemical coordination of Cu(II). This adsorption process followed the Pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity was 270.2 mg⋅g−1 at 303 K. In addition, the removal efficiency remained 83 % after 5 adsorption–desorption cycles. ZCCA showed outstanding adsorption performance and high potential in practical application. [ABSTRACT FROM AUTHOR]

[Display omitted] • Alternative methods for the resource utilization of municipal sludge and red mud. • Ammonium oxalate was applied to the activation of sludge and red mud for the first time, which provided amino functional groups and reduction. • Fe 2 O 3 in the red mud is reduced to Fe 3 O 4 and Fe0 during co-pyrolysis, biochar obtained in situ magnetization. • The actual adsorption capacity of adsorbent SRMBC-750 was 242.62 mg/g, which exhibited excellent adsorption capacity for Cu2+. In this study, municipal sludge and red mud were used as raw materials to prepare spontaneous magnetic biochar (SRMC-750) for the adsorption of Cu2+ from wastewater. The experimental findings demonstrated that the maximum actual adsorption capacity was 242.62 mg/g at 25 °C and pH 5. The adsorption process followed the pseudo-second-order kinetic model and the Freundlich isotherm model. The potential adsorption mechanisms were electrostatic attraction, complexation, cation-exchange, and "cation-π". After five adsorption cycles, SRMBC-750 still had 75% removal efficiency for Cu2+. Overall, SRMBC-750 provides a potential pathway for the removal of Cu2+ from wastewater. [ABSTRACT FROM AUTHOR]

In this study, cattail was researched as a natural cellulose source to extract cellulose. Dewaxing, alkali and bleaching treatments were carried out for the cattail fibers (CFs). The FTIR, SEM and XRD results indicated that hemicellulose and lignin were successfully removed from the CFs, and the content of cattail cellulose increased from 41.66 ± 1.11% to 89.72 ± 1.07%. Subsequently, cellulose aerogel was prepared by the extracted cattail cellulose. The Zeolitic imidazolate framework-8 (ZIF-8) was uniformly loaded onto the surface of cellulose aerogel by the in situ growth, and ZIF-8 Cattail Cellulose Aerogel (ZCCA) was finally prepared. The SEM, FTIR, XRD and TGA results further confirmed the successful preparation of ZCCA. Additionally, the results of the adsorption experiment showed that ZCCA had excellent adsorption performance for enrofloxacin, and the maximum adsorption capacity of enrofloxacin reached 172.09 mg·g−1 while showing good reusability. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm model. Thermodynamic studies showed that the adsorption of enrofloxacin was a spontaneous endothermic reaction and that the adsorption mechanism involves the interaction of hydrogen bonds, electrostatic and π-π stacking. [Display omitted] • Cellulose was successfully extracted from natural plant fibers, CFs. • Chemical extraction process effectively increased cellulose content (89.72%) of CFs. • A novel type of adsorbent, ZCCA, with controllable shape and environmental friendliness was prepared. • The resultant ZCCA had a three-dimensional network structure with ZIF-8 loading reaching 37 wt%. • ZCCA exhibits excellent adsorption performance for ENR, and the adsorption capacity can reach 172.09 mg·g−1. [ABSTRACT FROM AUTHOR]