One- and Two-Step Modification of Multiheterojunction Bismuth-Based Photocatalysts and Their Synergistic Mechanism of VO and Z-Type Heterojunction

The solid-phase method is a common method for the industrial preparation of bismuth-based materials, but it is difficult to achieve efficient photocatalytic performance due to the serious agglomeration of the material after calcination. In this study, bismuth silicate (BSO), bismuth tungstate (BWO), and BWO-BSO bismuth-based photocatalysts are successfully prepared by the solid-phase method, and BiOBr is introduced by one-step and two-step modification processes, which can create a "bridging" effect on BWO-BSO to solve the interfacial transport problem. These processes enhance the oxygen vacancies (V