Citation: GUO Li-Mei, KUANG Yuan-Jiang, YANG Xiao-Dan, YU Yan-Long, YAO Jiang-Hong, CAO Ya-An. Investigation on Photocatalytic Reduction of CO2into CH4 Using SrB2O4/SrCO3Composite Catalyst[J]. Acta Physico-Chimica Sinica, ;2013, 29(07): 1558-1565. doi: 10.3866/PKU.WHXB201304161
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An SrB2O4/SrCO3composite catalyst is synthesized by the simple sol-gel method. Reduction of carbon dioxide into methane in the presence of water is used to evaluate the photocatalytic activity of the composite catalyst. SrB2O4/SrCO3exhibits better photocatalytic performance than TiO2(P25) and SrB2O4 under irradiation with UV light. The crystalline structure, crystallite size, and the BET surface areas of the resultant photocatalysts are studied via the techniques of X-ray diffraction (XRD), transmission electron microscopy (TEM), and nitrogen adsorption-desorption isotherms. The energy levels of the SrB2O4/SrCO3 photocatalyst are determined from characterization with UV-Vis diffuse reflectance absorption spectra, X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) measurements. The heterojunction formed at the SrB2O4/SrCO3interface efficiently promotes photogenerated carrier separation and increases the use of photogenerated carriers in photocatalytic reactions at the solid/liquid interface, resulting in high photocatalytic activity under UV light.
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