物理化学学报 >> 2010, Vol. 26 >> Issue (12): 3299-3304.doi: 10.3866/PKU.WHXB20101139

催化和表面结构 上一篇    下一篇

WO3/Bi12SiO20光催化降解气相苯

吴大旺1,2, 李硕2,3, 陈耀强2, 龚茂初2, 张秋林2, 刘康莲1, 王玉林1   

  1. 1. 黔南民族师范学院化学与化工系, 贵州都匀558000;
    2. 四川大学化学学院, 绿色化学与技术教育部重点实验室, 成都610064;
    3. 烟台大学化学生物理工学院, 山东烟台264001
  • 收稿日期:2010-06-13 修回日期:2010-08-17 发布日期:2010-12-01
  • 通讯作者: 李硕, 陈耀强 E-mail:tianshan0991q@yeah.net, chenyaoqiang@scu.edu.cn
  • 基金资助:

    贵州省教育厅自然科学基金(2005221)资助项目

Photocatalytic Degradation of Gas Phase Benzene over WO3/Bi12SiO20

WU Da-Wang1,2, LI Shuo2,3, CHEN Yao-Qiang2, GONG Mao-Chu2, ZHANG Qiu-Lin2, LIU Kang-Lian1, WANG Yu-Lin1   

  1. 1. Department of Chemistry and Chemical Engineering, Qiannan National Normal University, Duyun 558000, Guizhou Province, P. R. China;
    2. Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
    3. Chemical and Biological Institute of Technology, Yantai University, Yantai 264001, Shandong Province, P. R. China
  • Received:2010-06-13 Revised:2010-08-17 Published:2010-12-01
  • Contact: LI Shuo, CHEN Yao-Qiang E-mail:tianshan0991q@yeah.net, chenyaoqiang@scu.edu.cn
  • Supported by:

    The project was supported by the Natural Science Foundation of the Department of Education of Guizhou Province, China (2005221).

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摘要：

用气液反应法和化学溶液分解技术(CSD)分别制备了WO3和Bi12SiO20粉末, 并将二者耦合, 合成出WO3/Bi12SiO20复合光催化剂. 以气相苯的降解为探针反应, 考查了催化剂的光催化活性. 结果表明: 耦合后的WO3/Bi12SiO20催化剂的催化活性显著提高, 其中30%(w) WO3/Bi12SiO20在紫外光下对苯的降解率明显优于P-25, 而且催化剂具有一定的可见光响应能力. 采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、N2吸附-脱附(BET)和紫外-可见漫反射(UV-Vis DRS)等手段对催化剂进行了表征. 结果表明: WO3与Bi12SiO20之间存在良好的能带协同作用. WO3与Bi12SiO20耦合后, 催化剂的光响应范围拓宽, 光生电子和空穴能有效地分离, 光生电子和空穴产生速率增大, 所以催化剂活性提高.

关键词: 耦合, 光催化, 降解, 气相苯

Abstract:

WO3 and Bi12SiO20 powders were prepared by a gas-liquid reaction and chemical solution decomposition, respectively. WO3/Bi12SiO20 photocatalysts were coupled by mixing WO3 and Bi12SiO20. The reduction of benzene was used to investigate the activity of WO3/Bi12SiO20. The results indicate that the activity of the coupled WO3/Bi12SiO20 catalysts increased substantially. The degradation behavior of benzene over 30%(w) WO3/Bi12SiO20 under UV irradiation was obviously better than that of P-25, and the degradation of benzene under visible light was also considerable. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The results showed that there was a good synergistic effect between WO3 and Bi12SiO20. The photogenerated electrons and holes were effectively separated after coupling between WO3 and Bi12SiO20 and the rate of electron and hole production increased. The electrons and holes were effectively separated and the photocatalytic activity increased accordingly.

Key words: Coupling, Photocatalysis, Degradation, Gas benzene