膜
银纳米粒子
聚酰胺
表面改性
化学工程
材料科学
抗菌剂
化学
涂层
薄膜复合膜
复合数
纳米颗粒
高分子化学
核化学
纳米技术
反渗透
复合材料
有机化学
生物化学
工程类
作者
Zhe Yang,Yichao Wu,Jianqiang Wang,Bin Cao,Chuyang Y. Tang
标识
DOI:10.1021/acs.est.6b01867
摘要
We report a facile method for the antimicrobial modification of a thin-film composite polyamide reverse osmosis (RO) membrane. The membrane surface was first coated with polydopamine (PDA), whose reducing catechol groups subsequently immobilized silver ions in situ to form uniformly dispersed silver nanoparticles (AgNPs) inside the coating layer. Agglomeration of AgNPs was not observed despite a high silver loading of 13.3 ± 0.3 μg/cm2 (corresponding to a surface coverage of 18.5% by the nanoparticles). Both diffusion inhibition zone tests and colony formation unit tests showed clear antimicrobial effects of the silver loaded membranes on model bacteria Bacillus subtilis and Escherichia coli. Furthermore, the silver immobilized membrane had significantly enhanced salt rejection compared to the control PDA coated membrane, which is attributed to the preferential formation of AgNPs at defect sides within the PDA layer. This self-healing mechanism can be used to prepare antimicrobial RO membranes with improved salt rejection without scarifying the membrane permeability, which provides a new dimension for membrane surface modification.
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