Triple-Mode Bi2WO6/Pg-C3N4@rGO Core-Shell Synergistic Effect with Enhanced Light-induced Photocatalytic Activity

Synthesizing composites is one of the most effective ways to reduce the recombination probability of electron-hole pairs and to improve photocatalytic activity. In this study, our research group first combined reduced graphene oxide (rGO) with porous graphitic carbon nitride (pg-C3N4) to form pg-C3N4@rGO core-shell, and then loaded bismuth tungstate (Bi2WO6) onto the pg-C3N4@rGO to acquire a ternary composite catalyst. The results of the experiment show that, the ternary photocatalyst exhibited better phototalytic performance than pure pg-C3N4 and Bi2WO6. When the weight radio of pg-C3N4@rGO and Bi2WO6 was 100:8, the ternary photocatalyst showed the best photocatalytic performance. Its photocatalytic kinetic constant reached 68 x 10(-4) min(-1), which was 13.6 times that of pg-C3N4 and 7.6 times that of Bi2WO6. The photocatalytic performance was boosted by the heterojunction structure of the ternary composite, which can effectively separate electron-hole pairs rapidly, and thereby increased quantum yield, thus improving the photocatalytic performance.