Declining flux and narrowing nanochannels under wrinkles of compacted graphene oxide nanofiltration membranes

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• 作者：Yi Wei^a ; Yushan Zhang^b ; ^{yushanzhang@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Xueli Gao^a ; ^{gxl_ouc@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yiqing Yuan^a ; Baowei Su^a ; Congjie Gao^a
• 刊名：Carbon
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：108
• 期：Complete
• 页码：568-575
• 全文大小：2179 K

文摘

Graphene oxide (GO), prepared using Hummers method, is used to fabricate nanofiltration membranes by pressure-assisted self-assembly method. The reasons for the formation of wrinkles on the surface of GO membranes are analyzed in this paper. GO membranes have serious flux attenuation and obvious changes in surface morphology due to hydraulic pressure. At 1.0 MPa, the water flux of GO membranes decreases about 75%, while at 1.5 MPa, sodium sulfate rejection increases from 21.32% to 85.84%. GO membranes were compacted and wrinkles became narrower under the influence of hydraulic pressure. By comparing flux decline between support membranes and GO membranes and analyzing the structure of GO laminate, we concluded that flux decline is due to the changes in the support membrane and GO laminate synergistically. This study reveals a defect of GO membranes and provides a profound analysis of water permeation through GO membranes.