Tuning d-spacing of graphene oxide nanofiltration membrane for effective dye/salt separation  

作　　者：Chao Xing Chang-Yu Liu Chao Lai Shan-Qing Zhang 

机构地区：[1]Center for Clean Environment and Energy,School of Environment and Science,Gold Coast Campus,Griffith University,Southport,QLD,4222,Australia [2]School of Chemistry and Materials Science,Jiangsu Normal University,Xuzhou,221116,China [3]School of Biotechnology and Health Sciences,Wuyi University,Jiangmen,529020,China

出　　处：《Rare Metals》2023年第2期418-429,共12页稀有金属（英文版）

基　　金：financially supported by Griffith University Ph.D.Scholarship;the National Natural Science Foundation of China(No.21808094);the Priority Academic Program Development of Jiangsu Higher Education Institutions,Natural Science Foundation of Jiangsu Province(No.BK20170237);Startup Funding for Introduced Talents of Jiangsu Normal University(No.16XLR015)。

摘　　要：The interlayer spacing(i.e.,d-spacing)plays a crucial role in determining the selectivity and permeability of nanofiltration membranes.A high-throughput directional filtration can be achieved by designing and controlling the d-spacing.In this study,the d-spacing of a graphene oxide(GO)membrane was tuned and fixed to the desired value(approximately 0.79 nm)using a solution of polyethyleneimine(PEI)and GO at a PEI/GO mass ratio of15:1.The resultant PEI/GO was deposited on a polyacrylonitrile(PAN)substrate to form a robust composite nanofiltration membrane(a PEI/GO@PAN membrane).The as-prepared membrane exhibited an ultrahigh flux of117.8 L·m^(-2)·h^(-1),and the rejection values for Direct Red80(DR80)and Na_(2)SO_(4)reached 99.7%and<1.7%,respectively;these are desirable values for dye/salt separation.The PEI/GO@PAN membrane exhibited an excellent filtration performance,and had a longer lifespan and excellent reusability because of its reinforced nature.This work suggested that tuning the d-spacing with PEI would be an effective strategy to achieve the anticipated functions of nanofiltration membranes.

关 键 词：SEPARATION NANOFILTRATION Graphene oxide MEMBRANE d-spacing 

分 类 号：TB383.2[一般工业技术—材料科学与工程]