Anti-fouling mechanism for ultrafiltration membrane of modified surface by carbon nanotubes
WANG Die, WANG Xiao-yang, CHEN Xi, HAN Min-yuan, WANG Yu-ting, XIANG Wen-yu, YAO Jing-mei, HAN Le
Key Laboratory of Eco-environment of Three Gorges Reservoir Area, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400044, China
Abstract：Carbon nanotubes (CNTs) as the core modification material was spray-coated on polyether sulfone (PES) ultrafiltration membrane towards enhanced anti-fouling property. The permeability of the modified membrane decreased slightly and the hydrophilicity increased obviously, and the layer of woven CNT fibre also increased the membrane roughness. In the presence of bovine serum albumin (BSA) of 20mg/L, the CNT-10membrane exhibited a high flux recovery rate up to 95.7% with the reversible fouling ratio nearly 60%. Then, applying electrical impedance spectroscopy (EIS) to measure membrane fouling extents provided the membrane real- imaginary impedance, conductance and capacitance. The Nyquist curve of CNT-10exhibited less horizontal shift (real impedance increases) towards the right side, and the radius of the curve was not significantly expanded after contamination test, in consistent with the slightly decreased conductance and relatively stable capacitance. It was concluded that the modified membrane has less foulant adhesion, agreeing with the flux variation. The discussion on frequency division of frequency-conductance diagram showed that BSA contaminated the entire surface and membrane of PES-V, but did not pollute the entire surface and membrane of CNT-10. The free energy analysis of the interfacial interaction between CNT modified layer and BSA was only half that for the control, indicating small membrane-foulant attraction, which explained the excellent anti-fouling performance of the CNT modified membrane by thermodynamics.
王蝶, 王小洋, 陈曦, 韩旻媛, 王钰婷, 向文毓, 姚婧梅, 韩乐. 碳纳米管界面改性超滤膜的抗污机理解析[J]. 中国环境科学, 2022, 42(4): 1618-1624.
WANG Die, WANG Xiao-yang, CHEN Xi, HAN Min-yuan, WANG Yu-ting, XIANG Wen-yu, YAO Jing-mei, HAN Le. Anti-fouling mechanism for ultrafiltration membrane of modified surface by carbon nanotubes. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1618-1624.
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