Cheng Xiuwen, Cheng Qingfeng, Deng Xiaoyong, Wang Pu, Liu Huiling
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Municipal of Environmental Engineering, Harbin Institute of Technology, Huanghe Road 73, Nangang District, Harbin 150090, PR China.
College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Municipal of Environmental Engineering, Harbin Institute of Technology, Huanghe Road 73, Nangang District, Harbin 150090, PR China.
Chemosphere. 2016 Feb;144:888-94. doi: 10.1016/j.chemosphere.2015.09.070. Epub 2015 Sep 28.
TiO2 nano-materials have been considered as a versatile candidate for the photoelectrochemical (PECH) applications. In this study, we reported a facile and novel strategy to synthesize reduced TiO2 nanotubes (TiO2 NTs) photoelectrode. The microwave reduction could introduce oxygen vacancy in the lattice of TiO2, while the rapid-production of oxygen vacancy facilitated the generation of impurity level between the forbidden band and greatly enhancement of visible light absorption, thereby resulting in an improved separation efficiency of photogenerated charge carriers and photocatalytic (PC) performance. Additionally, the derived valence band X-ray photoelectron spectroscopy (VBXPS) and photoluminescence (PL) spectra confirmed the existence of oxygen vacancy in the lattice of TiO2 NTs photoelectrode, in which the valence bond maximum (VBM) and charge carriers concentration of reduced TiO2 NTs photoelectrode was determined to be 1.75 eV and 5.36 × 10(19) cm(-3), respectively. Furthermore, the scavenging experiments revealed that ·OH radical was the dominated species for the degradation of diclofenac. The enhanced-visible-light PC mechanism could mainly be attributed to the generation of oxygen vacancy, which can provide not only the visible light absorption capacity but also charge separation efficiency.
二氧化钛纳米材料被认为是光电化学（PECH）应用的一种多功能候选材料。在本研究中，我们报道了一种简便新颖的策略来合成还原型二氧化钛纳米管（TiO₂NTs）光电极。微波还原可在TiO₂晶格中引入氧空位，而氧空位的快速产生促进了禁带间杂质能级的产生并极大增强了可见光吸收，从而提高了光生电荷载流子的分离效率和光催化（PC）性能。此外，所得到的价带X射线光电子能谱（VBXPS）和光致发光（PL）光谱证实了TiO₂NTs光电极晶格中存在氧空位，其中还原型TiO₂NTs光电极的价带最大值（VBM）和电荷载流子浓度分别测定为1.75 eV和5.36×10¹⁹ cm⁻³。此外，清除实验表明·OH自由基是双氯芬酸降解的主要物种。增强可见光PC机制主要可归因于氧空位的产生，其不仅能提供可见光吸收能力，还能提高电荷分离效率。
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