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ZIF-67 derived Co/N carbon hollow fiber membrane with excellent decontamination performance
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2022-08-01 , DOI: 10.1016/j.cej.2022.138403
Jia Xie , Yingpeng Yang , Hao Zhang , Saisai Chen , Zhengjun Lv , Yujun Zhou , Junwen Qi , Xiuyun Sun , Jiansheng Li

Advanced oxidation processes (AOPs) were appealing wastewater treatment options yet practices were hampered by reactor design and diminished performance in complex water matrices. Herein, one-step-pyrolysis strategy was proposed for large-scale synthesis of ZIF-67 derived conductive Co/N carbon hollow fiber ultrafiltration membrane to achieve exceptional availability of catalytic sites and interference prevention from macro molecular substances by size exclusion. Benefitting from the microenvironment modulation and electric field assistance (−1 V, membrane as the cathode), the bisphenol A (as a model micropollutant) can be efficiently removed with enhanced mass transfer of flow-through process (modified apparent reaction rate constant of 1260 μM gcat-1 s−1) and the active cobalt species were cycled via electroreduction thus showing exceptional sustainability with nearly zero Co leaching even after 24 h operation. The synergy effects between separation and catalysis alleviated the deteriorated AOPs efficiency and membrane fouling caused by macromolecular organic matter. The integrated membrane system provides new insight into rational design of catalytic membrane and system engineering for advanced water purification.



中文翻译:

ZIF-67衍生的Co/N碳中空纤维膜具有优异的去污性能

高级氧化工艺 (AOP) 是吸引人的废水处理选择,但实践受到反应器设计的阻碍,并降低了在复杂水基质中的性能。在此,提出了一步热解策略用于大规模合成 ZIF-67 衍生的导电 Co/N 碳中空纤维超滤膜,以通过尺寸排阻实现催化位点的卓越可用性和大分子物质的干扰防止。得益于微环境调节和电场辅助(-1 V,膜作为阴极),双酚 A(作为模型微污染物)可以通过增强的流通过程的传质被有效去除(修改后的表观反应速率常数为 1260 μM g cat -1 s -1) 并且活性钴物种通过电还原循环,因此即使在 24 小时运行后也显示出卓越的可持续性,几乎为零的 Co 浸出。分离和催化的协同作用缓解了大分子有机物引起的AOPs效率下降和膜污染。集成膜系统为催化膜的合理设计和高级水净化系统工程提供了新的见解。

更新日期:2022-08-01
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