Qin Yongqi, Deng Liqiang, Wei Shaodong, Bai Hui, Gao Wenqiang, Jiao Weizhou, Yu Tanlai
Lvliang Key Laboratory of Comprehensive Utilization of Organic Waste Resources, Department of Chemistry and Chemical Engineering, Lvliang University, Lvliang 033001, Shanxi, China.
Lvliang Key Laboratory of Optical and Electronic Materials and Devices, Lvliang University, Lvliang 033001, Shanxi, China.
Dalton Trans. 2022 May 3;51(17):6899-6907. doi: 10.1039/d2dt00488g.
Titanium dioxide (TiO) has attracted enormous interest in abundant photocatalytic reactions, but its photocatalytic efficiency is limited by its wide bandgap and the rapid recombination of electron-hole pairs. To overcome the disadvantages of its rapid electron-hole recombination rate, herein, oxidative TiO was one-step fabricated using potassium permanganate (KMnO), exhibiting improved charge separation efficiency and photocatalytic degradation performance towards methyl orange (MO). Remarkably, the first-order photodegradation rate of oxidative TiO is 3.68 times higher than that of pristine TiO under the irradiation of simulated sunlight and 2.15 times higher under ultraviolet light. This exceptional photocatalytic activity is attributed to the additional oxygen doped into the interstices of the TiO lattice, creating impurity states in the bandgap acting as trapping sites, thus facilitating charge separation. This work provides a promising strategy for the insertion of O atoms into the TiO lattice and expands the photocatalytic application of the related materials.
二氧化钛（TiO₂）在众多光催化反应中引起了极大的关注，但其光催化效率受到其宽带隙以及电子 - 空穴对快速复合的限制。为了克服其电子 - 空穴复合速率快的缺点，在此，使用高锰酸钾（KMnO₄）一步制备了氧化态的TiO₂，其对甲基橙（MO）表现出更高的电荷分离效率和光催化降解性能。值得注意的是，在模拟太阳光照射下，氧化态TiO₂的一级光降解速率比原始TiO₂高3.68倍，在紫外光下高2.15倍。这种优异的光催化活性归因于额外的氧掺杂到TiO₂晶格的间隙中，在带隙中形成杂质态作为俘获位点，从而促进电荷分离。这项工作为将O原子插入TiO₂晶格提供了一种有前景的策略，并扩展了相关材料的光催化应用。
