SYNTHESIS AND PHOTOCATALYTIC PERFORMANCE OF g-C3N4 COMPOSITES

Photocatalytic energy has been widely considered to be an effective solution to the problem of wastewater degradation. In this paper, g-C3N4 with different holding time was prepared by high temperature calcination, and the best catalytic results in different holding time were obtained by comparison test. Combined with the advantages of g-C3N4 and CuS, CuS/g-C3N4 composites with different g-C3N4 doping amount were prepared by water bath method. The structure and properties of the samples were characterized by X-ray diffraction, UV diffuse reflectance and fluorescence spectroscopy. Also, the methyl orange was used as the target pollutant. And the adsorption and photocatalytic efficiency of the composites were compared. Finally, CuS/g-C3N4 composite photocatalytic material with the best catalytic effect was obtained. Results showed: Different holding time had little effect on the photocatalytic effect, and the photocatalytic effect of carbon nitride with the holding time of 2 h was the best. Undoubtedly, the photocatalytic performance of the composites is much higher than that of g-C3N4 monomers. And the 9% CuS/g-C3N4 composite has the best photocatalytic performance and the highest degradation rate of methyl orange is up to 43.55%.