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Acta Phys. Chim. Sin.  2013, Vol. 29 Issue (02): 397-402    DOI: 10.3866/PKU.WHXB201211161
CATALYSIS AND SURFACE SCIENCE     
Photocatalytic Reduction of CO2 into CH4 Using SrB2O4 Catalyst
GUO Li-Mei1,2, KUANG Yuan-Jiang3, YANG Xiao-Dan1,2, YU Yan-Long1,2, YAO Jiang-Hong1,2, CAO Ya-An1,2
1 College of Physics, Nankai University, Tianjin 300071, P. R. China;
2 Teda Applied Physics School, Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin 300457, P. R. China;
3 Maintenance Training Center, Zhenjiang Watercraft College, Zhenjiang 212000, Jiangsu Province, P. R. China
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Abstract  

The reduction of carbon dioxide to methane in the presence of water was used to evaluate the photocatalytic activity of a prepared strontium metaborate catalyst. The strontium metaborate (SrB2O4) was prepared by a simple sol-gel method, and was shown to exhibit better photocatalytic performance than TiO2 (P25) under UV-light irradiation. The structure, morphology, and energy levels of the photocatalysts were studied by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, and UV-Vis diffuse reflectance absorption spectroscopy. It was revealed that the SrB2O4 valence band (VB) was located at 2.07 V (vs normal hydrogen electrode, NHE), which is more positive than Eredoxo (H2O/H+) (0.82 V (vs NHE)); the conduction band was estimated to be -1.47 V (vs NHE)), which is more negative than Eredoxo (CO2/CH4) (-0.24 V (vs NHE)). Therefore, it is clear that strontium metaborate is capable of transforming CO2 into CH4. Moreover, the potential at the bottom of the conduction band for SrB2O4 is more negative than that for TiO2(P25), leading to a higher deoxidization capacity, which also favors CH4 formation. Thus, SrB2O4 exhibits a higher photocatalytic activity than TiO2(P25).



Key wordsStrontium metaborate      Photocatalytic reduction of CO2      CH4      Redox potential      Photocatalytic activity     
Received: 28 September 2012      Published: 21 November 2012
MSC2000:  O643  
  O644  
Fund:  

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

Cite this article:

GUO Li-Mei, KUANG Yuan-Jiang, YANG Xiao-Dan, YU Yan-Long, YAO Jiang-Hong, CAO Ya-An. Photocatalytic Reduction of CO2 into CH4 Using SrB2O4 Catalyst. Acta Phys. Chim. Sin., 2013, 29(02): 397-402.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201211161     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2013/V29/I02/397

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