A facile strategy to fabricate reduced TiO2 nano-tube arrays photoelectrode and its high visible light photocatalytic performance for detoxification of trichlorophenol solution
A facile strategy to fabricate reduced TiO2 nano-tube arrays photoelectrode and its high visible light photocatalytic performance for detoxification of trichlorophenol solution
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一种简便的制备还原TiO2纳米管阵列光电极的策略及其对三氯苯酚溶液解毒的高可见光光催化性能
DOI：
10.1016/j.jtice.2017.12.020
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发表时间：
2018-04
影响因子：
5.7
通讯作者：
Cheng Qingfeng
中科院分区：
文献类型：
--
作者：
Deng Xiaoyong;Guo Ruonan;Zhang Huixuan;Li Bo;Ma Qiuling;Cui Yuqi;Zhang Xinyi;Cheng Xiuwen;Xie Mingzheng;Cheng Qingfeng
本研究采用硼氢化钾（PBH）还原法制备了还原型TiO 2纳米管阵列（R-TiO 2 NTAs）光电极。利用扫描电子显微镜、X射线衍射、拉曼光谱和电子自旋共振等对所制备的光电极进行了表征。同时，通过紫外-可见漫反射光谱和瞬态光电流响应研究了R-TiO 2 NTAs光电极的光学和光电化学性质。以三氯苯酚（TCP）为降解物，研究了R-TiO 2 NTAs光电极的光催化活性。此外，通过发光菌抑制试验进一步研究了TCP降解过程中毒性中间产物的变化。结果表明，通过溶液还原处理，由于Ti 3+和氧空位（Ov）的产生，可以在TiO 2 NTAs带隙中引入杂质能级。R-TiO 2 NTAs光电极具有更高的光电转换活性，这是由于R-TiO 2 NTAs在450 ~ 800 nm范围内的可见光捕获能力和光生电子-空穴（e/h+）对的分离效率的提高。提出并证实了TCP降解的可能途径和光催化机理。R-TiO 2 NTAs光电极具有良好的稳定性和可重复使用性。
In the research, reduced TiO2nano-tube arrays (denoted as R-TiO2NTAs) photoelectrode was successfully fabricated by potassium borohydride (PBH) reduction treatment. Afterwards, the as-fabricated photoelectrode was characterized by scanning electron microscope, X-ray diffraction, Raman spectra and electron spin resonance. Meanwhile, the optical and photoelectrochemical properties of R-TiO2NTAs photoelectrode were also studied through ultraviolet-visible diffuse reflectance spectroscopy and transient photocurrent response, respectively. The photocatalytic (PC) activity of R-TiO2NTAs photoelectrode was measured by degradation of trichlorophenol (TCP). Moreover, the change of toxic intermediates in the process of degradation TCP was further evaluated by photobacterium inhibition tests. Results suggested that an impurity level can be induced in the TiO2NTAs band gap by solution reduction treatment due to the generation of Ti3+and oxygen vacancies (Ov). Furthermore, R-TiO2NTAs photoelectrode exhibited higher PC activities than that of pristine TiO2NTAs owing to the enhancement of visible light harvesting between 450 and 800 nm and separation efficiency of photogenerated electrons-holes (e/h+) pairs. The possible pathway for TCP degradation and photocatalytic mechanism were also proposed and confirmed. Furthermore, R-TiO2NTAs photoelectrode displayed good stability and reusability.
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