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Graphene Oxide Nanofiltration Membranes Stabilized by Cationic Porphyrin for High Salt Rejection

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journal contribution
posted on 2016-05-09, 00:00 authored by Xiao-Ling Xu, Fu-Wen Lin, Yong Du, Xi Zhang, Jian Wu, Zhi-Kang Xu
Swelling has great influences on the structure stability and separation performance of graphene oxide laminate membranes (GOLMs) for water desalination and purification. Herein, we report cross-linked GOLMs from GO assembled with cationic tetrakis­(1-methyl-pyridinium-4-yl)­porphyrin (TMPyP) by a vacuum-assisted strategy. The concave nonoxide regions (G regions) of GO are used as cross-linking sites for the first time to precisely control the channel size for water permeation and salt ion retention. Channels around 1 nm are constructed by modulating the assembly ratio of TMPyP/GO, and these cross-linked GOLMs show high salt rejection.