Construction of g-C3N4-BiOBrxI1-x Nanocomposites with Tunable Energy Band Structure for Enhanced Visible Light Photocatalytic CO2 Reduction

The g-C 3 N 4 -BiOBr x I 1- x nanocomposites were successfully prepared using solvothermal methods. The obtained g-C 3 N 4 -BiOBr x I 1- x composites had tunable band structures and displayed preferable photocatalytic performance for CO 2 reduction irradiated by visible light. Moreover, comparing to pure g-C3N4 and corresponding BiOBr x I 1- x , all the obtained g-C 3 N 4 -BiOBr x I 1- x nanocomposites exhibited distinctly higher activity for CO 2 reduction, with 5% g-C 3 N 4 -BiOBr 0.25 I 0.75 nanocomposites displaying the best photocatalytic performance. Enhanced photocatalytic performance of g-C 3 N 4 -BiOBr x I 1- x nanocomposites may arrive from their advantages of high efficiency of electron-hole separation, tunable band structures, and rapid charge transfer. Moreover, a possible visible light induced photocatalytic mechanism on g-C 3 N 4 -BiOBr x I 1- x nanocomposites was further proposed.