title: Graphene Oxide Nanofiltration Membranes Stabilized by Cationic Porphyrin for High Salt Rejection.
abstract: 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.
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: Xu
authors.forename: Fu-Wen
authors.initials: FW
authors.lastname: Lin
authors.forename: Yong
authors.initials: Y
authors.lastname: Du
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.affiliation: Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University , Nanjing 201123, China.
authors.forename: Zhi-Kang
authors.initials: ZK
authors.lastname: Xu
keywords: graphene oxide; intercalation; membrane; nanofiltration; salt rejection