THE ENHANCEMENT OF GRAPHENE OXIDE MEMBRANES'WATER PURIFICATION PERFORMANCE AND STABILITY VIA COVALENT CROSSLINKING WITH P-PHENYLENEDIAMINE(PPD)

摘要

The increasing depletion of freshwater globally necessitates efficient re-use and purification of wastewaters.Among the existing separation membrane materials,graphene oxide(GO)is a promising next generation separation membrane candidate,owing to its tunable physicochemical properties [1].However,the widening of GO membranes pore gap in aqueous environments is a major limitation [2].Crosslinking agents can be incorporated to alleviate this problem.This study describes a comparative analysis of uncrosslinked and p-Phenylenediamine(PPD)crosslinked GO membranes'water purification performance.Dip-coating and dip-assisted layer by layer methods were used to fabricate the uncrosslinked and crosslinked membranes respectively.