A gas-solid and postsynthetic modification was proposed to enrich surface bridging hydroxyls (OH_B) on TiO₂ using ozone. It was found that the adsorbed ozone and its decomposition into oxygen atoms on oxygen vacancies would induce water dissociation and form OH_B, narrowing the bandgap and enhancing the photoresponse. The increased OH_B significantly doubled the efficiency of photogenerated charge carriers transfer, thus generating more reactive oxygen species. Additionally, OH_B provided more adsorption sites for toluene, contributing to the excellent activity and stability. The degradation pathways of toluene containing OH addition and hydrogen abstraction were proposed based on in situ DRIFTS results. Ozone treatment was more effective than other reported surface treatments, and presented a universal improvement on both gas-solid and liquid-solid photodegradation. This work provides a facile, effective, and alternative strategy for the targeted regulation of OH_B on TiO₂ under mild conditions and insight into the mechanism underlying the process.

提出了一种气固和合成后改性，以使用臭氧富集TiO ₂上的表面桥连羟基 (OH _B ) 。发现吸附的臭氧及其在氧空位上分解为氧原子会引起水离解并形成OH _B，从而缩小带隙并增强光响应。增加的 OH _B显着增加了光生载流子转移的效率，从而产生了更多的活性氧。此外，OH _B为甲苯提供了更多的吸附位点，有助于其优异的活性和稳定性。基于原位DRIFTS结果提出了含OH加氢和夺氢甲苯的降解途径。臭氧处理比其他报道的表面处理更有效，并且在气固和液固光降解方面都有普遍的改进。这项工作为在温和条件下有针对性地调节TiO ₂上的 OH _B和深入了解该过程的机制提供了一种简便、有效和替代的策略。