The graphene oxide (GO) was synthesized by hummers method,and then melamine was used as a precursor to thermally synthesize graphitic carbon nitride (g-C3N4) in a muffle furnace.GO and melamine were mixed at different mass ratios.After homogenization,a new GO/g-C3N4 composite photocatalyst was prepared by the same method.The prepared samples were further characterized by XRD,FT-IR and SEM.The results shown that the introduction of GO maintained the bonding form and major structure of g-C3N4,but built irregular holes and spherical particles on its surface,thus greatly increased its specific surface area.The photocatalytic activity test indicated that the degradation rate of the photocatalyst on the methylene blue (MB) in aqueous solution was higher than that of pure g-C3N4 (6.41%) under the LED lamp,and 1.00wt.% GO/g-C3N4 possessed the highest efficiency (21.84%) with 3.41 fold increase.The influence of catalytic concentration,temperature and cycles were also investigated.
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