Abstract
Enhanced photocatalytic activity of the graphene-hybridized TiO2 composite by nitrogen anion under the visible light has been reported, where we presented the synthesis of nitrogen-doped graphene/TiO2 (graphene–N/TiO2−xNx) by a hydrothermal method in a solution containing urea. A hybrid photocatalyst consisting of TiO2, nitrogen anion and graphene sheets with excellent solar light-induced photoactivity was demonstrated as compared with graphene/TiO2 and graphene/TiO2−xNx composite. The photocatalytic activity of graphene/TiO2 composite in the presence of nitrogen anion was evaluated by degradation of benzoic acid under solar light, which showed a remarkable enhancing effect. This work determined that nitrogen anion not only expands the visible light absorption region of TiO2, but also accelerates the electron transfer in the graphene network as a highway.
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