Fabrication of g‐C3N4/Bi4O5Br2 2D Nanosheet Photocatalyst for Removal of Organic Pollutants under Visible Light Irradiation

Abstract

AbstractThe g‐C3N4/Bi4O5Br2 photocatalyst was successfully prepared by a facile hydrothermal method for the degradation of organic pollutants under visible light. The structure of the catalyst is a two‐dimensional (2D) nanosheet structure with a high specific surface area, which provides more active sites. The heterojunction structure of g‐C3N4/Bi4O5Br2 can narrow the bandgap and thus increase the visible light absorption. The heterojunction formed by g‐C3N4 and Bi4O5Br2 can facilitate the separation and transfer of photogenerated electrons and holes (e−−h+). The degradation efficiencies of g‐C3N4/Bi4O5Br2 prepared under the optimal conditions are higher than 93.1 % for ciprofloxacin (CIP), rhodamine B (Rh B), and methylene blue (MB) under visible light. The results of the trapping experiment indicate that h+ and ⋅O2− contribute greatly to the removal of organic pollutants. Furthermore, the feasible mechanism of g‐C3N4/Bi4O5Br2 to degrade organic pollutants is proposed.