Fabrication of simple and efficient adsorbents is greatly vital to satisfy the requirements of removal of tellurium in wastewater treatment , yet remains challenging. Here, a facile and cost-effective strategy to develop ZIF-L coated self-crosslinking cellulose membrane (ZIF-L/SC membrane) for tellurium adsorption was presented. In-situ vertical growth of ZIF-L nanoplates with functional properties on membrane substrate is an available strategy, effectively remedying deficiency of pure nanosized sorbent in agglomeration problem and unhandy recovery. The SC membrane formed by strong hydrogen bonding among cellulose fibers is an excellent substrate, due to the favorable mechanical strength and abundant hydroxyl groups. The as-prepared ZIF-L/SC membrane shows advantageous morphology of large contact surface, fine thermal stability and eligible mechanical strength. The adsorption performance and possible mechanism of ZIF-L/SC membrane for Te (IV) were investigated by diverse characterization methods, showing admirable adsorption effect. Furthermore, the ZIF-L/SC membrane has excellent antibacterial properties, thus it is expected to deal with membrane fouling caused by microorganism breeding. Therefore, the bifunctional ZIF-L/SC membrane with excellent antibacterial activity is anticipated to be a promising candidate for efficient tellurium adsorbents, and simultaneously have potential in various fields in the future.
Yuting Dai,Zefeng Jing,Zhangdi Li,Yao Zhu,Fengxian Qiu,Jianming Pan,Tao Zhang,Chunxiang Li
Fabrication of eco-friendly and efficient biosorbents played a crucial role in adsorbing tellurium from wastewater, yet which was confronted with large obstacles to achieve a high adsorption capacity and biocompatibility simultaneously. Herein, a simple and economical strategy for adsorbing tellurium by nanosized zero-valent iron/ cellulose fiber hybrid aerogel (nZVI/CFA) is proposed. Cellulose fiber aerogel (CFA) was firstly fabricated by freeze-drying the cellulose fibers that were extracted from agricultural waste maize bracts. Then, the nZVI was uniformly anchored on the porous network skeleton structure of CFA by liquid-phase reduction. The nZVI/CFA exhibited mesoporous structure with a large specific surface area (399.85 m 2 /g), uniform pore size (3.92 nm) and pore volume (0.47 cm 3 /g). According to the kinetics and isothermal model, the tellurium adsorption by nZVI/CFA was uniform and endothermic-chemical on the monolayer surface. Due to the highly exposed specific surface area , more active sites and the synergistic effect of electrostatic attraction, reduction and substitution, nZVI/CFA has a high adsorption capacity (119.32 mg/g). As a low-cost and efficient biosorbent, nZVI/CFA provided a new idea for the treatment with other abandoned photovoltaic materials and agricultural waste.
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