Preparation and visible light photocatalytic activity of g-C3Nx@ZnxO heterojunction catalyst
In order to address the defects of conventional ZnO photocatalysts such as wide energy band gap,low quantum yield and poor stability,ZIF-8 was grown in situ on the surface of g-C3Nx with g-C3Nx as the substrate and ZnO as a metal source,and g-C3Nx@ZnxO heterogeneous catalysts with high stability and visible photocatalytic activity were fabricated after high temperature calcination.The experimental materials were characterized analytically us-ing TEM,XRD,UV-DRS,transient photocurrent and g-C3 Nx@ZnxO was used for the visible photocatalytic degradation of methylene blue organics in aqueous environment.The results show that the introduction of g-C3Nx and ZIF-8 leads to a narrowing of the optical absorption energy band gap,an enhancement of the transient pho-tocurrent response signal,and a reduction of the photogenerated electron-hole pairs in the material.The visible light degradation rate of methylene blue catalyzed by g-C3Nx@ZnxO reached 98.45％.
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