偏硼酸锶/碳酸锶复合催化剂光催化还原CO2生成CH4的研究

doi:10.3866/PKU.WHXB201304161

Abstract

Abstract:

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.

Key words: SrB₂O₄/SrCO₃composite catalyst, Photocatalytic reduction of CO₂, CH₄, Photocatalytic activity

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 Phys. -Chim. Sin., 2013, 29(07): 1558-1565.

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Investigation on Photocatalytic Reduction of CO₂into CH₄ Using SrB₂O₄/SrCO₃Composite Catalyst

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