Preparation of Stable Hydrophilic Polyethyleneimine Cross-Linked Graphene Oxide/Titanium Dioxide Membranes for Dye Separation

An excellent novel laminar and hierarchical polyethyleneimine cross-linked graphene oxide/ titanium dioxide (GO-TiO2-PEI) membrane was successfully prepared by vacuum filtration technology using polyethyleneimine (PEI) as the cross-linking agent and a GO-TiO2 nanocomposite as the substrate. The resultant membrane (GO- TiO2-PEI) displayed a favorable antifouling performance with bovine serum albumin (BSA) and showed good hydrophilicity and wettability, with a static water contact angle of 13.2 -. The stability of the GO-TiO2-PEI membrane in aqueous solution obviously improved with the cross-linking of PEI compared with that of the GO and GO-TiO2 membranes. The GO-TiO2-PEI membrane also exhibited a satisfactory water degrees ux of 48.6 L m- 2 h-1 bar -1. The GO-TiO2-PEI membrane exhibited a good performance for e (R) ectively separating di (R) erent dyes including methylene blue (MB), rhodamine B ( RB), methyl orange (MO), sunset yellow (SY), new coccine (NC) and amaranth. All the above results suggested that the GO-TiO2- PEI membrane could be used as an excellent stable hydrophilic membrane for e +/- ciently separating dyes from aqueous solution.