CuO负载空心球状BiVO4可见光矿化气相甲苯

doi:10.3866/PKU.WHXB201402132

Abstract

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

ZHAO Wei-Rong, ZENG Wan-Yun, XI Hai-Ping, YU Xian-Xian. Photocatalytic Degradation of Gas-Phase Toluene over CuO Loaded BiVO₄ Hollow Nanospheres under Visible-light Irradiation[J]. Acta Phys. -Chim. Sin. 2014, 30(4), 761-767. doi: 10.3866/PKU.WHXB201402132

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

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