Fabrication of Z-scheme BiVO4/GO/g-C3N4 Photocatalyst with Efficient Visble-Light Photocatalytic Performance

Abstract

Fabricating Z-scheme photocatalysts is a promising method for improving photocatalytic activity by effectively enhancing charge separation.A new Z-scheme BiVO 4 /GO/g-C 3 N 4 photocatalyst was prepared by two steps of impregnation-calcination and hydrothermal method, and then characterized by different methods.In the photocatalytic process of BiVO 4 /GO/g-C 3 N 4 , GO nanosheet act as fast transmission channels between BiVO 4 and g-C 3 N 4 and can suppress electron-hole recombination, which significantly promotes the charge separation and improves the redox ability of the ternary heterojunction.The ternary photocatalyst has good photocatalytic degradation of Rhodamine B (RhB) as compared to the single-component or binary composite.It is capable of degrading 85% of RhB in 120 min under visible light irradiation and the hole (h + ) plays a major role in the reaction.This work provides a simple preparation method for a ternary photocatalyst system in which g-C 3 N 4 coupled with BiVO 4 by GO to significantly improve photocatalytic activity.