物理化学学报 >> 2014, Vol. 30 >> Issue (4): 761-767.doi: 10.3866/PKU.WHXB201402132

材料物理化学 上一篇    下一篇

CuO负载空心球状BiVO4可见光矿化气相甲苯

赵伟荣, 曾婉昀, 奚海萍, 余纤纤   

  1. 浙江大学环境工程系, 杭州310058
  • 收稿日期:2013-12-17 修回日期:2014-02-07 发布日期:2014-03-31
  • 通讯作者: 赵伟荣 E-mail:weirong@mail.hz.zj.cn
  • 基金资助:

    国家自然科学基金(51178412,51278456)和国家科技支撑计划项目(2013BAC16B01)资助

Photocatalytic Degradation of Gas-Phase Toluene over CuO Loaded BiVO4 Hollow Nanospheres under Visible-light Irradiation

ZHAO Wei-Rong, ZENG Wan-Yun, XI Hai-Ping, YU Xian-Xian   

  1. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China
  • Received:2013-12-17 Revised:2014-02-07 Published:2014-03-31
  • Contact: ZHAO Wei-Rong E-mail:weirong@mail.hz.zj.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51178412, 51278456) and National Key Technologies R&D Program (2013BAC16B01).

摘要:

以碳球为模板,采用溶胶-凝胶法制备空心球状BiVO4,浸渍法制备CuO负载BiVO4. 运用X射线衍射(XRD)、扫描电镜(SEM)、高分辨率透射电镜(HRTEM)、Brunauer-Emmett-Teller (BET)、塔菲尔(Tafel)、线性扫描(LSV)、光电转化效率(IPCE)、紫外-可见漫反射光谱(UV-Vis-DRS)等手段对催化剂进行表征. 结果表明,空心球状BiVO4比表面积(10.24 m2·g-1)是无定型BiVO4 (1.97 m2·g-1)的5.20 倍. 负载CuO后,与BiVO4形成p-n 型异质结结构. 其中,5%负载量的空心球状BiVO4具有最佳电化学性能,Tafel 表征腐蚀电流密度(2.22 μA·cm-2)为空心球状BiVO4(0.18 μA·cm-2)的12.33 倍,禁带宽度减小为2.30 eV. 以甲苯为模型污染物研究催化剂对挥发性有机化合物(VOCs)的催化去除和矿化效果,5% CuO负载量的空心球状BiVO4光催化氧化能力最佳,可见光照6 h甲苯降解率达85.0%,矿化率达12.0%.

关键词: 溶胶-凝胶法, 异质结, 电化学, 挥发性有机化合物, 光电转化效率

Abstract:

The sol-gel method was used for the synthesis of BiVO4 hollow nanospheres by employing carbon spheres as a hard template. CuO loaded composite photocatalysts were prepared by impregnation. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET), Tafel polarization curves (Tafel), linear sweep voltammetry (LSV), monochromatic incident photon to current conversion efficiency (IPCE), and UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS). We found that the BET surface area of the BiVO4 hollow nanospheres (10.24 m2·g-1) was 5.20 times that of the amorphous form of BiVO4 (1.97 m2·g-1). A p-n heterojunction was formed between CuO and BiVO4. Samples with 5% CuO exhibited optimal photoelectrochemical performance. They had a higher corrosion current density (12.33 times as much as that of the BiVO4 hollow nanospheres), and a smaller band gap (2.30 eV). Toluene was chosen as a model pollutant to evaluate the removal capacity and the CO2 mineralization rate of volatile organic compounds under visible light. The samples doped with 5% CuO exhibited optimal visible-light photocatalytic activity, with an 85.0% toluene degradation efficiency and a 12.0% mineralization rate in 6 h.

Key words: Sol-gel method, Heterojunction, Electrochemistry, Volatile organic compound, Photon to current conversion efficiency

MSC2000: 

  • O643