Due to the high electronegativity, dissolved O₂ molecules can form strong chemisorption on oxygen-deficient nano-TiO₂, which can alter the photocatalytic degradation process. Regarding this point, there is a lack of sufficient investigation so far, although there have been many reports on oxygen-deficient nano-TiO₂. Here, we make the dissolved O₂ adsorbed on the oxygen-deficient nano-TiO₂ by simply stirring for a long time. The characterization and theoretical calculation results show that the chemisorption of O₂ significantly enhances the surface hydrogen bonding and results in a substantial increase in the co-adsorbed H₂O molecules and –OH groups. The co-chemisorbed oxygen species promote the separation of electron-hole pairs, meanwhile accelerate the migration and accumulation of holes to the surface, which effectively enhances the direct oxidation of photogenerated holes. The findings of this work suggest that for long continuous reactions, the role of chemisorbed dissolved O₂ molecules on the photocatalytic degradation activity of oxygen-deficient nano-TiO₂ has to be considered.

由于高电负性，溶解的O ₂分子可以在缺氧的纳米TiO _{2上形成强烈的化学吸附}，从而改变光催化降解过程。关于这一点，目前还缺乏充分的研究，虽然有很多关于缺氧纳米TiO ₂的报道。在这里，我们通过简单的长时间搅拌，使溶解的O ₂吸附在缺氧的纳米TiO _2上。表征和理论计算结果表明，O ₂的化学吸附显着增强了表面氢键并导致共吸附的H _{2显着增加}O分子和-OH基团。共化学吸附的氧物质促进了电子-空穴对的分离，同时加速了空穴向表面的迁移和积累，有效地增强了光生空穴的直接氧化。这项工作的结果表明，对于长时间的连续反应，必须考虑化学吸附溶解的 O ₂分子对缺氧纳米 TiO _{2的光催化降解活性的作用。}