In this study,a g-C3N4/Ag3PO4 composite Z-heterojunction photocatalyst was prepared with a simple in situ deposition method,and was applied to the degradation of sul-fathiazole(STZ).When the theoretical g-C3N4 to Ag3PO4 mass ratio was 1∶5(denoted as AG-5),the STZ degradation was optimal,and the degradation efficiency reached 95.6%within 10 min.In addition,capture of the active species showed that photogenerated holes(h+)played a major role in the reaction.Finally,the optical properties and the energy band structure of the catalyst were analyzed by UV-VIS diffuse reflectance spectroscopy(DRS),and a Z-type heterojunction charge transfer mechanism was proposed.
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