To improve the water dispersibility of graphene based powder photocatalyst,titanium dioxide/graphene (TG) was first prepared using a hydrothermal method in this paper,and then the ternary composite photocatalytic materials were prepared by covalently grafting TG with dyes containing hydrophilic groups.The bandgap,water dis-persibility,and photocatalytic degradation performance of methylene blue (MB) simulated wastewater of the photo-catalysts were mainly investigated.The results showed that the bandgaps of the DTG series of composites were nar-rowed compared to that of TG,extending the light response range to the visible light region.The composite D2.70 TG exhibited good water dispersibility,and no significant precipitation aggregation occurred after 7 days of testing.The removal rate of MB in the simulated wastewater by D2.70 TG under the irradiation of visible light for 2 h was over 99％,and the removal rate remained above 95％ after 5 cycles of experimentation.
维普
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