Photocatalytic degradation of phenol using Au/Bi 2 WO 6 composite microspheres under visible-light irradiation

Micro & nano letters

article

Jian-Yi Liu¹  Yang Bai¹  Ping-Quan Wang¹ 

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University

关键词: bismuth compounds;    catalysis;    gold;    nanocomposites;    nanofabrication;    nanoparticles;    oxidation;    photochemistry;    radiation effects;    scanning electron microscopy;    transmission electron microscopy;    ultraviolet spectra;    visible spectra;    X-ray chemical analysis;    X-ray diffraction;    X-ray photoelectron spectra;    photocatalytic degradation;    visible-light irradiation;    composite microspheres;    phenol;    gold loaded nanosheet-based microspheres;    in-situ reduction approach;    hydrothermal method;    scanning electron microscopy;    high-resolution transmission electron microscopy;    UV-vis diffuse reflectance;    X-ray photoelectron spectroscopy;    energy-dispersive X-ray spectroscopy;    X-ray diffraction;    nanoparticles;    photocatalytic activity;    photocatalytic mechanism;    photogenerated holes oxidised water molecules;    oxidative pathway;    Au-Bi2WO6;   

DOI  :  10.1049/mnl.2012.0759

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Gold loaded Bi 2 WO 6 (Au/Bi 2 WO 6 ) nanosheet-based microspheres were prepared via a hydrothermal method combined with an in-situ reduction approach. The products were characterised by scanning electron microscopy, a high-resolution transmission electron microscope, X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and UV–vis diffuse reflectance. The characterisation results revealed that it was the Au nanoparticles deposited on Bi 2 WO 6 microspheres. A photocatalytic test for the degradation of phenol proved that Au loading was an effective means to enhance the photocatalytic activity of Bi 2 WO 6 nanosheet-based microspheres under visible-light irradiation (λ > 420 nm). The photocatalytic mechanism over the Au/Bi 2 WO 6 was analysed by active species trapping experiments. The main active species •OH for the photocatalytic test was produced by two pathways, that is, photogenerated holes oxidised water molecules to form •OH (oxidative pathway), and O 2 captured the photogenerated electron to generate •O 2 − and subsequently produce •OH (reductive pathway).

【 授权许可】

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