Preparation of P-coupled g-C3N4/TiO2 photoanode and its photoelectrocatalytic degradation of sulfadiazine

Abstract

In order to solve the problems of TiO2 bandgap width and low utilization rate of light energy, red phosphorus which can absorb visible light is introduced, which is complementary to the characteristics of TiO2 which mainly absorb ultraviolet light. The introduction of red phosphorus is expected to broaden the light response range of the photoelectrode to the visible region, thereby improving the efficiency of sunlight utilization. TiO2 was modified by red phosphorus sublimation precipitation. The joint introduction of P and g-C3N4 not only broadened the photoresponse range of TiO2, extended the visible light absorption range to 460nm, improved the light absorption efficiency, but also promoted the effective separation and transmission of charge, thus greatly improving the degradation efficiency of SD up to 90.28%. ꞏOH, h+ and ꞏO2- were the main active species of SD degradation, in which ꞏOH played a key role.