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ZIF-67 modified MXene/sepiolite composite membrane for oil–water separation and heavy metal removal
Qiuxiang Wang,Zongxue Yu,Ximei Zhu,Qingcan Xiang,Haidong Chen,Yao Pang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
In this study, polyvinylpyrrolidone (PVP) was used as a cross-linking agent leading to ZIF-67 in-situ growon the surface of sepiolite (Sep) to increase the specific surface area and space volume of Sep. Subsequently, a hydrothermal synthesis method was used to form a stable super-hydrophilic compositemembrane from the composite MXene by polydopamine. Compared to the MXene/PDA/Sep (MPS) compositemembrane, the composite membrane with ZIF-67 exhibited improved hydrophilicity and heavymetal separation. In addition, the introduction of negatively charged Sep@ZIF-67–24 (SZ-24) increasedthe number of adsorption active sites and negative potential for the surface of the membrane, and thiswas conducive to the demulsification and adsorption of oil–water emulsions. The MXene/PDA/Sep@ZIF-67–1 (MSZ-1) composite membrane had excellent separation effects on surfactant-stabilizedemulsions (SSEs) and surfactant-free emulsions (SFEs) oil–water emulsions which were above 99.4 %. Furthermore, the separation effect on oil–water, under extreme water conditions, was greater than99 %. The MSZ-1 composite membrane can achieve excellent separation of heavy metal ions, especiallyCu2+ that the rejection was 79.9 %, under high flux and extreme conditions. Therefore, the MSZ-1 compositemembrane has broad application prospects in oil–water treatment and heavy metal separation.
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