偏硼酸锶催化剂光催化还原CO<sub>2</sub>合成CH<sub>4</sub>

引用本文: 郭丽梅, 匡元江, 杨晓丹, 于彦龙, 姚江宏, 曹亚安. 偏硼酸锶催化剂光催化还原CO₂合成CH₄[J]. 物理化学学报, 2013, 29(02): 397-402. doi: 10.3866/PKU.WHXB201211161 shu

Citation: 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[J]. Acta Physico-Chimica Sinica, 2013, 29(02): 397-402. doi: 10.3866/PKU.WHXB201211161 shu

偏硼酸锶催化剂光催化还原CO₂合成CH₄

基金项目:
国家自然科学基金(51072082, 21173121)资助项目 (51072082, 21173121)

摘要:

采用溶胶-凝胶法制备出偏硼酸锶(SrB₂O₄)光催化剂. 紫外光催化还原CO₂合成CH₄(在液相水中)的实验证明: SrB₂O₄催化剂的光催化活性略高于TiO₂(P25). 利用X射线电子衍射谱(XRD)、傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、荧光(PL)光谱和紫外-可见(UV-Vis)漫反射吸收光谱等技术, 研究了SrB₂O₄ 催化剂的晶体结构、形貌和能带结构. 结果表明: SrB₂O₄ 的价带为2.07 V (vs normalhydrogen electrode (NHE)), 低于(H₂O/H⁺)的氧化还原电位E_redox^o (0.82 V (vs NHE)); 而导带为-1.47 V (vsNHE), 高于(CO₂/CH₄)的氧化还原电位E_redox^o (-0.24 V (vs NHE)). 因此, SrB₂O₄催化剂可以有效地光催化还原CO₂生成CH₄. 与TiO₂(P25)相比, SrB₂O₄催化剂具有相对较高导带, 光生电子的还原能力强于TiO₂(P25), 更有利于CH₄的生成, 从而决定了SrB₂O₄催化剂光催化还原CO₂合成CH₄具有较高的光催化活性.

关键词:

English

Photocatalytic Reduction of CO₂ into CH₄ Using SrB₂O₄ Catalyst

1.
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
Received Date: 28 September 2012
Available Online: 14 January 2013
Fund Project:
国家自然科学基金(51072082, 21173121)资助项目

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 E_redox^o (H₂O/H⁺) (0.82 V (vs NHE)); the conduction band was estimated to be -1.47 V (vs NHE)), which is more negative than E_redox^o (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 words:

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沈阳化工大学材料科学与工程学院沈阳 110142

偏硼酸锶催化剂光催化还原CO₂合成CH₄

English

Photocatalytic Reduction of CO₂ into CH₄ Using SrB₂O₄ Catalyst

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