膜
零价铁
废水
化学工程
材料科学
超滤(肾)
涂层
水处理
微滤
化学
色谱法
复合材料
废物管理
有机化学
吸附
生物化学
工程类
作者
Na Li,Huai-duo Chen,Yong-Ze Lu,Mingchao Zhu,Zhaoxia Hu,Shouwen Chen,Raymond Jianxiong Zeng
标识
DOI:10.1016/j.cej.2020.127701
摘要
In recent years, nanoscale zero-valent iron (nZVI) has been considered an appealing alternative for halogenated organic compound removal for its advantages, such as its high activity. However, easy aggregation limits nZVI activity. In this study, functional nZVI-modified PVDF membranes ([email protected] membranes) were successfully prepared by a simple and easy-to-follow filter-press coating method and was applied in the ultrafiltration process to treat 2-chlorophenol (2-cp) wastewater. Scanning electron microscopy showed that nZVI particles were relatively uniformly distributed on the membrane surface and formed a fluffy and porous space-stacked structure. 2-cp ultrafiltration degradation results illustrated that [email protected] membranes revealed good 2-cp removal efficiencies ranged from 56.06% to74.62%. These 2-cp removal efficiencies were higher than those for Fe supported on powder materials and were relatively comparable to those for nZVI composite membranes prepared by complex methods (e.g., blend spinning and cross-linking methods). Furthermore, the 2-cp degradation efficiencies by [email protected] membranes were not affected much in the presence of natural organic matter and different ions, demonstrating a robust anti-interference ability of [email protected] membrane. The mechanism underlying its robust performance likely resulted from that nZVI was uniformly distributed and loaded layer by layer on the PVDF membrane surface with high loading capacity, which guaranteed high nZVI activity, layer-layer interception of pollutants and complete reaction between nZVI and pollutants. These findings provide key insights into how [email protected] membranes could be integrated into the treatment of wastewater containing refractory pollutants.
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