Holey graphene oxide/methylene blue composite membrane with high flux for water treatment
Xuan Liu,Shihao Li,Hangdong Chen,Xiang Yu,Mingyang Li,Yafei Zhang,Bin Li,Nantao Hu
Abstract
Two key factors limiting the industrial application of graphene oxide membranes are low water flux and easy swelling in water during operation. In this study, a novel holey graphene oxide/methylene blue (HGO/MB) composite membrane was prepared by vacuum filtration using a two-step method, including chemical etching graphene oxide (GO) with H2O2 to improve the water flux and then intercalating MB into HGO to limit the swelling of GO membranes effectively. The composite membrane showed a higher pure water flux of 23.4 L/m2.h.bar, which was improved about 6 times compared to GO membrane. The rejection rates of the membrane for Na2SO4, methyl orange (MO) and rhodamine B (Rh B) reached 83.2%, 93% and 97%, respectively. HGO/MB composite membrane remained stability after 15 min of ultrasound treated because of the π - π conjugation and electrostatic interaction between HGO and MB. This study demonstrated that the membranes prepared have effectively improved water flux and stability without loss of rejection, which held great potential for water treatment applications.
Xuan Liu, Shihao Li, Hangdong Chen, Xiang Yu, Mingyang Li — College of Engineering, Shanghai Ocean University, 999 Huchenghuan Road, Pudong New Area District Shanghai, P.R.China
Yafei Zhang, Nantao Hu — Key Laboratory for Thin Film and Microfabrication Technology of the Ministry of Education, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Minhang District, Shanghai, P.R.China
Bin Li — Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai, 200245, China
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