Novel S-scheme Bi24O31Cl10/Bi7Fe2Ti2O17Cl Heterojunction for Efficient and Stable Photocatalytic Activities

Abstract

The strategy to boost photocatalytic activities towards CO₂ reduction and organic pollutants degradation is still a key challenge for novel Sillén-Aurivillius oxyhalides. In this work, a 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 depicts 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 a S-scheme heterojunction via Bi-based oxyhalides for efficient photocatalytic activity.