Transition metal oxides have high photothermal conversion capacity and excellent thermal catalytic activity, and their photothermal catalytic ability can be further improved by reasonably inducing the photoelectric effect of semiconductors. Herein, Mn₃O₄/Co₃O₄ composites with S-scheme heterojunctions were fabricated for photothermal catalytic degradation of toluene under ultraviolet-visible (UV-Vis) light irradiation. The distinct hetero-interface of Mn₃O₄/Co₃O₄ effectively increases the specific surface area and promotes the formation of oxygen vacancies, thus facilitating the generation of reactive oxygen species and migration of surface lattice oxygen. Theoretical calculations and photoelectrochemical characterization demonstrate the existence of a built-in electric field and energy band bending at the interface of Mn₃O₄/Co₃O₄, which optimizes the photogenerated carriers’ transfer path and retains a higher redox potential. Under UV-Vis light irradiation, the rapid transfer of electrons between interfaces promotes the generation of more reactive radicals, and the Mn₃O₄/Co₃O₄ shows a substantial improvement in the removal efficiency of toluene (74.7%) compared to single metal oxides (53.3% and 47.5%). Moreover, the possible photothermal catalytic reaction pathways of toluene over Mn₃O₄/Co₃O₄ were also investigated by in situ DRIFTS. The present work offers valuable guidance toward the design and fabrication of efficient narrow-band semiconductor heterojunction photothermal catalysts and provides deeper insights into the mechanism of photothermal catalytic degradation of toluene.

过渡金属氧化物具有较高的光热转化能力和优异的热催化活性，通过合理诱导半导体的光电效应可以进一步提高其光热催化能力。在此，制备了具有 S 型异质结的Mn ₃ O ₄ /Co ₃ O _{4复合材料，用于在紫外-可见 (UV-Vis) 光照射下光热催化降解甲苯。Mn 3} O ₄ /Co ₃ O ₄独特的异质界面有效增加比表面积，促进氧空位的形成，从而促进活性氧的产生和表面晶格氧的迁移。_{理论计算和光电化学表征表明在Mn 3} O ₄ /Co ₃ O ₄界面存在内建电场和能带弯曲，优化了光生载流子的传输路径并保持较高的氧化还原电位。在紫外-可见光照射下，界面间电子的快速转移促进了更多活性自由基的产生，Mn ₃ O ₄ /Co ₃ O ₄与单一金属氧化物（53.3% 和 47.5%）相比，甲苯（74.7%）的去除效率有了显着提高。此外，还通过原位DRIFTS研究了甲苯在Mn ₃ O ₄ /Co ₃ O _{4上可能的光热催化反应途径。}目前的工作为高效窄带半导体异质结光热催化剂的设计和制造提供了有价值的指导，并为甲苯的光热催化降解机理提供了更深入的见解。