In Situ Construction of Porous g‐C 3 N 4 Isotype Heterojunction/BiOBr Nanosheets Ternary Composite Catalyst for Highly Efficient Visible‐Light Photocatalytic Activity

Abstract In this study, the composite catalysts with the heterojunction between DUPG and BiOBr were used to degrade methyl orange (MO), and a g‐C 3 N 4 ‐based ternary composite catalyst was developed. In our previous work, we prepared a D‐C 3 N 4 /U‐C 3 N 4 isotype heterojunction with ordered mesoporous (DUPG) by co‐mixed calcination and hard template method. On this basis, we prepared DUPG/BiOBr nanoparticle uniformly distributed on DUPG nanosheets by coprecipitation self‐assembly method. The hybrids form a tightly coupled heterojunction that enhances the photoactivity and photostability of the DUPG/BiOBr composites. The results show that this tight coupling is beneficial, which facilitates the charge transfer between DUPG and BiOBr, thus promoting the effective separation of photogenerated electron hole pairs. Under visible light irradiation, the methyl orange conversion of the sample has higher photocatalytic reduction activity than BiOBr and DUPG, and its excellent photocatalytic activity is improved by light‐harvesting ability, increased specific surface area, active species and target pollution.