膜
化学工程
聚苯胺
结垢
电化学
生物污染
材料科学
碳纳米管
膜污染
聚合
化学
电极
纳米技术
有机化学
聚合物
生物化学
工程类
物理化学
作者
Longxin Jiang,Masoud Rastgar,Chunrong Wang,Shu Ke,Lei He,Xiao‐Ya Chen,Yifan Song,Can He,Jianbing Wang,Mohtada Sadrzadeh
标识
DOI:10.1016/j.seppur.2022.122274
摘要
Electro-responsive membranes provide a promising strategy to overcome the trade-off between water recovery and water quality in membrane-based wastewater treatment. However, the successful deployment of these membranes is restricted by their low mechanical stability and poor electrochemical reactivity. Herein, we strived to overcome these challenges by constructing a polyaniline-entangled oxidized CNTs ([email protected]) cathodic membrane via a sequential laminating technique. The effective in-situ polymerization of the PANI network on the CNTs skeleton and the superior conductivity of the [email protected] membrane was demonstrated by extensive characterizations. Durability test results showed the excellent mechanical and electrochemical stability of the robust [email protected] membranes. Cyclic voltammetry (CV) analysis confirmed that the modification of nitrogen-rich PANI on CNTs boosted their reactivity for electro-generation of H2O2. By applying an external voltage of −2.0 V, the [email protected] membrane displayed an enhanced rejection from 35.2 % to 77.4 % for negatively charged methyl orange (MO) dye and from 41.5 % to 79.8 % for positively charged methylene blue (MB) dye at 50 min operation time. Moreover, the rejection efficiencies further increased to 89.7 % for MO and 93.4 % for MB through the synergistic effect of electrostatic interactions and H2O2 oxidation. Additionally, antifouling experiments performed with oppositely charged dyes indicated that H2O2 oxidation played a critical role in flux recovery and fouling alleviation. Our results raise the prospect of utilizing electro-responsive membranes to remove specific organic matter from wastewater.
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