Enhanced Photocatalytic Performance of NiS2/g‐C3N4/SnS2 by Improving the Charge Diffusion on Both Valence Band and Conduction Band of Carbon Nitride

Abstract

AbstractHerein, a novel Z‐scheme heterojunction of nickel disulfide (NiS2)/graphitic carbon nitride (g‐C3N4)/(tin disulphide) SnS2 has been successfully prepared by a simple one‐step hydrothermal method. Compared to the pristine g‐C3N4, a considerable enhancement on the photocatalytic activity of the heterojunction for the photodegradation of methyl orange was obtained, which is attributed to the promoted separation and transfer of the photo‐induced exciton due to the formation of Z‐scheme mechanism in NiS2/g‐C3N4/SnS2 composites. In particular, the composite of 1 %‐NiS2/g‐C3N4/SnS2 shows the highest apparent quasi‐first‐order rate constant of 0.0633 min−1 for the photodegradation of methyl orange, which is 6.96 times and 2.50 times as large as that of the pristine g‐C3N4 and 5 %‐SnS2/g‐C3N4, respectively.