生物污染
化学工程
反渗透
材料科学
膜
聚酰胺
相位反转
Zeta电位
海水淡化
薄膜复合膜
表面改性
超滤(肾)
色谱法
接触角
高分子化学
结垢
化学
纳米颗粒
复合材料
纳米技术
生物化学
工程类
作者
Dandan Chen,Tianyu Li,Jian Kang,Ruizhang Xu,Ya Cao,Ming Xiang
标识
DOI:10.1002/admi.201900706
摘要
Abstract The increase of the permeability and antifouling properties of reverse osmosis (RO) membranes is always significant in desalination. In this study, zwitterionic amino acid l ‐Arginine (Arg) is grafted onto the self‐made RO membrane by one‐step method to construct the zwitterionic surface for enhancing the performances of the membranes. X‐ray photoelectron spectroscopy verifies the successful covalent attachment of Arg onto the membrane surface. Atomic force microscopy, contact angle, and zeta potential measurements manifest that the modified membrane surface becomes smoother, more hydrophilic, and less negatively charged. The contact angles decrease from 72.6° to 43.7° after Arg‐modification. For the optimized modified membrane, its water flux increases from original 45.46 to 63.51 L m −2 h −1 (improved by 39.7%); while the salt rejection ascends from 96.42% to 98.08%. Using bovine serum albumin and dodecyltrimethyl ammonium bromide as model foulants, fouling‐resistant properties of the modified membranes are estimated by three‐time cycle filtration tests. The experimental results show that the modified membranes have superior fouling‐resistant and easy‐cleaning properties. Mechanism concerning the roles of grafting Arg in the enhancement of the performances of the resulting membranes is proposed.
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