Novel S-scheme Bi24O31Cl10/Bi7Fe2Ti2O17Cl heterojunction for efficient and stable photocatalytic activities

The strategy to boost photocatalytic activities toward CO2 reduction and organic pollutants degradation is still a key challenge for novel Sillén–Aurivillius oxyhalides. In this work, an S-scheme heterojunction of Bi24O31Cl10 and Bi7Fe2Ti2O17Cl is designed for CO2 reduction and organic pollutants degradation. The as-synthesized 5 % Bi24O31Cl10/Bi7Fe2Ti2O17Cl (BOC/BFTOC-5) composites depict an appealing CO2 reduction and removal rate for RhB organic pollutants in comparison with pristine Bi24O31Cl10 and Bi7Fe2Ti2O17Cl oxyhalides. This fascinating photocatalytic performance could be ascribed to the synergic effect of the enhanced visible light adsorption and photo-generated carriers separation derived from the Bi24O31Cl10/Bi7Fe2Ti2O17Cl heterojunction. Simultaneously, the trapping experiments confirm that the main active species during the catalytic process are the photo-generated hole (h+) and the hydroxy free radical (·OH). This work aims at providing an S-scheme heterojunction via Bi-based oxyhalides for efficient photocatalytic activity.