Institute of Chemicobiology and Functional Materials, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei Street, Nanjing, 210094, PR China.
Institute of Chemicobiology and Functional Materials, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei Street, Nanjing, 210094, PR China.
Chemosphere. 2022 Dec;308(Pt 2):136239. doi: 10.1016/j.chemosphere.2022.136239. Epub 2022 Aug 29.
Photocatalytic technology in eliminating organic pollutants is considered to be one of the most promising technologies to solve environmental issues. However, the low catalytic activity exhibited by Titanium dioxide (TiO) limits its further application. In order to enhance the photocatalytic activity, structural regulation of TiO is designed by chemical reduction method to promote the production of massive Ti and oxygen vacancies (OVs), these defects can serve as inter-band level of semiconductor to enhance photon capture and transfer efficiency of photogenerated charge. The samples show strong light absorption ability, which leads to excellent photocatalytic activity for various organic pollutants degradation. Results showed robust degradation of MO, RhB, DCP and TC under UV irradiation within 60 min. Estimated quantum yields of as-synthesized TiO systems for removing representative pollutants are calculated, which indicates higher reactivity than commercial TiO. The XPS, TEM, photoelectrochemical analysis and EPR results intuitive reveal the micro-morphology, band structure and active species of Ti doped defective TiO. This work can provide an essential reference for structural regulation and composition of oxide semiconductor since the methodology could be freely applicable to other systems.
光催化技术在消除有机污染物方面被认为是解决环境问题最有前途的技术之一。然而，二氧化钛 (TiO) 表现出的低催化活性限制了其进一步的应用。为了提高光催化活性，通过化学还原法对 TiO 进行结构调控，以促进大量 Ti 和氧空位 (OVs) 的产生，这些缺陷可以作为半导体的能带间水平，提高光生载流子的光子捕获和转移效率。样品表现出很强的光吸收能力，从而使各种有机污染物的降解具有优异的光催化活性。结果表明，在 60 分钟内，在 UV 照射下，MO、RhB、DCP 和 TC 具有很强的降解能力。计算了所合成的 TiO 体系去除代表性污染物的量子产率，表明其反应活性高于商业 TiO。XPS、TEM、光电化学分析和 EPR 结果直观地揭示了 Ti 掺杂缺陷 TiO 的微观形貌、能带结构和活性物种。由于该方法可以自由应用于其他体系，因此这项工作可以为氧化物半导体的结构调控和组成提供重要的参考。
