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

Abstract The g‐C 3 N 4 /Bi 4 O 5 Br 2 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‐C 3 N 4 /Bi 4 O 5 Br 2 can narrow the bandgap and thus increase the visible light absorption. The heterojunction formed by g‐C 3 N 4 and Bi 4 O 5 Br 2 can facilitate the separation and transfer of photogenerated electrons and holes (e − −h + ). The degradation efficiencies of g‐C 3 N 4 /Bi 4 O 5 Br 2 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 ⋅O 2 − contribute greatly to the removal of organic pollutants. Furthermore, the feasible mechanism of g‐C 3 N 4 /Bi 4 O 5 Br 2 to degrade organic pollutants is proposed.