화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.115, 314-328, November, 2022
DOI10.1016/j.jiec.2022.08.014  Export Citation
ZIF-67 modified MXene/sepiolite composite membrane for oil–water separation and heavy metal removal
Qiuxiang Wang1, 2, Zongxue Yu1, 2, †, Ximei Zhu1, 2, Qingcan Xiang1, 2, Haidong Chen1, 2, and Yao Pang1, 2
  • 1College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China
  • 2Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China
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In this study, polyvinylpyrrolidone (PVP) was used as a cross-linking agent leading to ZIF-67 in-situ grow on 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 composite membrane from the composite MXene by polydopamine. Compared to the MXene/PDA/Sep (MPS) composite membrane, the composite membrane with ZIF-67 exhibited improved hydrophilicity and heavy metal separation. In addition, the introduction of negatively charged Sep@ZIF-67–24 (SZ-24) increased the number of adsorption active sites and negative potential for the surface of the membrane, and this was 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-stabilized emulsions (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 than 99 %. The MSZ-1 composite membrane can achieve excellent separation of heavy metal ions, especially Cu2+ that the rejection was 79.9 %, under high flux and extreme conditions. Therefore, the MSZ-1 composite membrane has broad application prospects in oil–water treatment and heavy metal separation.
Keywords:In-situ grow;Hydrothermal synthesis;Super-hydrophilic;Heavy metal separation;Oil-water emulsion;Extreme water condition
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