In order to enhance the photocatalytic activity under visible light of the classic photocatalyst TiO2,g-C3N4/TiO2 nanoarray films (g-C3N4/TiO2 NRAs) with excellent catalytic properties were prepared by hydrothermal method and vacuum impregnation calcination method.The samples were characterized by XRD,SEM,XPS,UV-Vis and photoelectrochemical tests.The results showed that g-C3N4 was successfully coated on the surface of TiO2 nanorods with good photocatalytic performance under visible light.After 180min of visible light irradiation,the efficiency of g-C3N4/TiO2 NRAs to degrade unsymmetrical dimethylhydrazine (UDMH) wastewater was twice that of TiO2.The improved photocatalytic performance was due to the improved response of the catalyst to visible light on the one hand,and the formation of heterojunction on the other hand,which effectively promoted the separation of photogenerated electrons and holes.In addition,the composite study of g-C3N4 and TiO2 NRAs also provided a new way for the photocatalytic degradation of UDMH wastewater that was easy to recover and did not easily cause secondary pollution.
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