Photocatalytic oxidation process for treatment of gas phase benzene using Ti3+ self-doped TiO2 microsphere with sea urchin-like structure
Photocatalytic oxidation process for treatment of gas phase benzene using Ti3+ self-doped TiO2 microsphere with sea urchin-like structure
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DOI：
10.1016/j.cej.2020.126220
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发表时间：
2020-12-15
影响因子：
15.1
通讯作者：
Einaga, Hisahiro
中科院分区：
文献类型：
--
作者：
Liu, Xin;Zhang, Ya;Einaga, Hisahiro
光催化氧化工艺(PCO工艺)是一种很有前途的控制工作环境污染的技术，即工业过程中产生的低浓度挥发性有机化合物(VOCs)，提高该工艺的效率是一个重要的问题。本研究以海胆状结构的TiO2光催化氧化气相苯，详细考察了Ti3+自掺杂对TiO2光催化性能的影响。用X射线衍射仪、X射线光电子能谱、紫外-可见漫反射光谱、电子自旋共振、扫描电子显微镜和高分辨电子显微镜对其结构和性能进行了表征。在真空条件下加热，在TiO2微球中生成Ti3+离子，从而提高了TiO2光催化剂对苯完全氧化为CO2和CO的催化性能。光电化学测试表明，Ti3+的加入减少了电子-空穴复合，增加了光吸收能力，有助于提高光催化活性。原位FTIR光谱研究表明，在苯氧化过程中，Ti3+自掺杂二氧化钛微球抑制了二氧化钛表面强结合副产物的形成，从而影响了苯氧化反应的速率。因此，Ti3+自掺杂二氧化钛微球是有效利用紫外光和抑制苯氧化过程中催化剂失活的有效催化剂。
Photocatalytic oxidation processes (PCO processes) are a promising technology for controlling the pollution of working environments, namely, the low concentrations of volatile organic compounds (VOCs) generated in industrial processes, and improving the efficiency of this process is an important issue. In this study, the photocatalytic oxidation of gas-phase benzene was carried out with TiO2 microspheres with a sea-urchin-like structure, and the effect of Ti3+ self-doping on the catalytic performance of TiO2 was investigated in detail. The structures and properties were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy, electron spin resonance, scanning electron microscopy, and high-resolution transmission electron microscopy. Ti3+ ions were formed in TiO2 microspheres by heating under vacuum, which improved the catalytic performance of TiO2 for the complete oxidation of benzene to CO2 and CO. The photoelectrochemical measurements showed that the incorporation of Ti3+ into TiO2 microspheres reduced electron-hole recombination and increased the light absorption capacity, which contributed to improving the photocatalytic activity. In situ FTIR spectroscopic studies revealed that in the benzene oxidation process, Ti3+ self-doped TiO2 microspheres suppressed the formation of strongly bound byproduct compounds on the TiO2 surface, which affected the rate of benzene oxidation. Thus, the Ti3+ self-doped TiO2 microspheres are effective catalysts for efficient use of UV light and suppression of catalyst deactivation during benzene oxidation.