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FT-IR study of the photocatalytic degradation of gaseous toluene over UV-irradiated TiO_2 microballs: enhanced performance by hydrothermal treatment in alkaline solution

机译:FT-IR研究紫外辐照的TiO_2微球对气态甲苯的光催化降解:在碱性溶液中通过水热处理提高性能

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摘要

In this study, photocatalysts of TiO_2 microballls were obtained via a hydrothermal treating of commercial P25 in alkaline solution, and then characterized with SEM, XRD, BET, DRS and surface photovoltage spectroscopy (SPS) techniques. The photovoltage response of the prepared TiO_2 microballs on spectrum features a quantum size effect brought about by the reduced grain size with respect to the precursor. The UV-assisted photodegradation of gaseous toluene over P25 and the prepared TiO_2 microballs was monitored by an in situ infrared technique. The results demonstrated that the prepared TiO_2 microballs in anatase form were more active than commercial P25 in photocatalytic oxidation of gaseous toluene. The promoted activity of the hydrothermal-treated TiO_2 is attributed to the increasing specific surface area and larger band gap induced by the reduced crystallite size.
机译:本研究通过对商品P25在碱性溶液中进行水热处理获得了TiO_2微球的光催化剂,然后用SEM,XRD,BET,DRS和表面光电压谱(SPS)技术对其进行了表征。制备的TiO_2微球在光谱上的光电压响应具有量子尺寸效应,该效应是由相对于前体的减小的晶粒尺寸引起的。通过原位红外技术监测了P25和制备的TiO_2微球上UV辅助的气态甲苯的光降解。结果表明,所制备的锐钛矿型TiO_2微球在气态甲苯的光催化氧化方面比商业P25更具活性。经水热处理的TiO_2的活性提高归因于微晶尺寸减小引起的比表面积增加和带隙增大。

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  • 来源
    《Applied Surface Science》 |2011年第10期|p.4709-4714|共6页
  • 作者单位

    Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Sciences and Technology, Dalian University of Technology, Dalian, 116024, China Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia;

    Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Sciences and Technology, Dalian University of Technology, Dalian, 116024, China;

    Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Sciences and Technology, Dalian University of Technology, Dalian, 116024, China;

    Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    TiO_2 microballs; Toluene; Photocatalytic oxidation; Surface photovoltage; In-situ FT-IR;

    机译:TiO_2微球;甲苯;光催化氧化;表面光电压;原位FT-IR;

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