物理化学学报 >> 2013, Vol. 29 >> Issue (07): 1558-1565.doi: 10.3866/PKU.WHXB201304161

催化和表面科学 上一篇    下一篇

偏硼酸锶/碳酸锶复合催化剂光催化还原CO2生成CH4的研究

郭丽梅1, 匡元江2, 杨晓丹1, 于彦龙1, 姚江宏1, 曹亚安1   

  1. 1 弱光非线性光子学教育部重点实验室, 南开大学泰达应用物理学院和物理科学学院, 天津 300457;
    2 中国人民解放军镇江船艇学院维修训练中心, 江苏 镇江 212000
  • 收稿日期:2013-02-15 修回日期:2013-04-15 发布日期:2013-06-14
  • 通讯作者: 曹亚安 E-mail:caoyaan@yahoo.com
  • 基金资助:

    国家自然科学基金(51072082, 21173121)资助项目

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

GUO Li-Mei1, KUANG Yuan-Jiang2, YANG Xiao-Dan1, YU Yan-Long1, YAO Jiang-Hong1, CAO Ya-An1   

  1. 1 Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, TEDA Applied Physics School and School of Physics, Nankai University, Tianjin 300457, P. R. China;
    2 Maintenance Training Center, Zhenjiang Watercraft College, Zhenjiang 212000, Jiangsu Province, P. R. China
  • Received:2013-02-15 Revised:2013-04-15 Published:2013-06-14
  • Contact: CAO Ya-An E-mail:caoyaan@yahoo.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51072082, 21173121).

摘要:

采用溶胶-凝胶法制备出SrB2O4和SrCO3复合催化剂(SrB2O4/SrCO3). 紫外光催化还原CO2生成CH4的实验证明, SrB2O4/SrCO3复合催化剂的光催化活性已超过SrB2O4和TiO2(P25)催化剂. 利用X 射线电子衍射(XRD)谱、透射电子显微镜(TEM)和等温氮气吸附-脱附分析确定了催化剂的晶相结构、粒子尺寸和比表面积.利用紫外-可见(UV-Vis)漫反射吸收光谱、X射线光电子能谱(XPS)的价带谱和荧光光谱(PL)确定了催化剂的能带结构, 结果表明: SrB2O4/SrCO3复合催化剂异质结构有利于光生载流子的分离, 从而抑制了光生电子和光生空穴的复合, 提高了光生电子和光生空穴在固液界面参加光催化反应的利用率. 因此, SrB2O4/SrCO3复合催化剂的紫外光催化活性得到了有效的提高.

关键词: SrB2O4/SrCO3复合催化剂, 光催化还原CO2, CH4, 光催化活性

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

MSC2000: 

  • O643