LBL assembled polyelectrolyte nanofiltration membranes with tunable surface charges and high permeation by employing a nanosheet sacrificial layer
LBL assembled polyelectrolyte nanofiltration membranes with tunable surface charges and high permeation by employing a nanosheet sacrificial layer
复制标题
LBL通过采用纳米片牺牲层组装了具有可调表面电荷和高渗透性的聚电解质纳滤膜
DOI：
10.1039/c7ta03183a
复制
发表时间：
2017-07-28
影响因子：
11.9
通讯作者：
Liu, Qinglin
中科院分区：
文献类型：
--
作者：
Lin, Zhen;Zhang, Qiugen;Liu, Qinglin
Polyelectrolyte membranes provide a highly promising platform for an efficient and sustainable nanofiltration (NF) process. The challenge is to prepare polyelectrolyte NF membranes with high permeation. Herein, we report a novel strategy to fabricate a polyelectrolyte membrane via a layer-by-layer (LBL) self-assembly technique with a Ni(OH)2 nanosheet sacrificial layer for a fast NF process. The sacrificial layer helps to deposit a LBL assembled polyelectrolyte layer directly on a microfiltration (MF) substrate and thus results in the formation of a membrane with tiny filtration resistance. Meanwhile, the surface charges and thickness of the membranes can be adjusted facilely by the number of assembled layers. The resultant membranes show excellent NF performances with a high water flux of up to 466 L m−2 h−1 bar−1, perfect rejection for organic dye molecules and moderate salt rejection (88.2% MgSO4). Typically, the 570 nm-thick membrane has the water flux of 198 L m−2 h−1 bar−1, 98% rejection for dyes (Mw 373.9) and 81.3% rejection for MgCl2. Furthermore, the membrane has a good rejection and anti-fouling ability for organic molecules with similar charges. The newly developed strategy has wide application in the fabrication of highly permeable polyelectrolyte membranes.
