The Sn doped BiOCl (BOC-Sn) nanosheets photocatalyst was fabricated by a one-step chemical precipitate method using BiCl₃ and SnCl₄·5H₂O as precursors. The as-fabricated BOC-Sn was applied to the photocatalytic purification of toluene. The microstructures and physicochemical properties of the samples were systematically characterized by XRD, SEM, TEM, UV–vis DRS, PL, XPS, EPR, photocurrent, EIS, BET-BJH. The in situ FT-IR spectroscopy was used to investigate the adsorption and reaction intermediates of photocatalytic toluene degradation under ultraviolet light irradiation. The photocatalytic reaction mechanism was proposed based on the DFT calculation and ESR results. The results indicate that the doped Sn atoms could promote the light absorption, separation and migration of photo-generated carriers on BOC-Sn. However, the reaction intermediates were benzyl alcohol, benzaldehyde and benzoic acid during the photocatalytic toluene degradation on BOC-Sn, which revealed that BOC-Sn and BOC samples featured different reaction mechanisms. The present work could provide insight into the designed Sn-doped BiOCl nanosheets and photocatalytic toluene degradation mechanisms.

以BiCl ₃和SnCl ₄ ·5H ₂ O为前驱体，通过一步化学沉淀法制备了Sn掺杂BiOCl（BOC-Sn）纳米片光催化剂。将制备的 BOC-Sn 应用于甲苯的光催化纯化。通过XRD、SEM、TEM、UV-vis DRS、PL、XPS、EPR、光电流、EIS、BET-BJH系统地表征了样品的微观结构和理化性质。在原位FT-IR光谱用于研究紫外光照射下光催化降解甲苯的吸附和反应中间体。基于DFT计算和ESR结果提出了光催化反应机理。结果表明，掺杂的Sn原子可以促进BOC-Sn上光生载流子的光吸收、分离和迁移。然而，BOC-Sn光催化甲苯降解过程中的反应中间体是苯甲醇、苯甲醛和苯甲酸，这表明BOC-Sn和BOC样品具有不同的反应机理。目前的工作可以深入了解设计的 Sn 掺杂 BiOCl 纳米片和光催化甲苯降解机制。