偏硼酸锶催化剂光催化还原CO2合成CH4

doi:10.3866/PKU.WHXB201211161

物理化学学报 >> 2013, Vol. 29 >> Issue (02): 397-402.doi: 10.3866/PKU.WHXB201211161

偏硼酸锶催化剂光催化还原CO₂合成CH₄

郭丽梅^1,2, 匡元江³, 杨晓丹^1,2, 于彦龙^1,2, 姚江宏^1,2, 曹亚安^1,2

1 南开大学物理科学学院, 天津 300071;
2 南开大学泰达应用物理学院, 弱光非线性光子学教育部重点实验室, 天津 300457;
3 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:2012-09-28 修回日期:2012-11-15 发布日期:2013-01-14
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

Photocatalytic Reduction of CO₂ into CH₄ Using SrB₂O₄ Catalyst

GUO Li-Mei^1,2, KUANG Yuan-Jiang³, YANG Xiao-Dan^1,2, YU Yan-Long^1,2, YAO Jiang-Hong^1,2, CAO Ya-An^1,2

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

Received:2012-09-28 Revised:2012-11-15 Published:2013-01-14
Supported by:
The project was supported by the National Natural Science Foundation of China (51072082, 21173121).

摘要/Abstract

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: 偏硼酸锶, 光催化还原CO₂, CH₄, 氧化还原电位, 光催化活性

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: Strontium metaborate, Photocatalytic reduction of CO₂, CH₄, Redox potential, Photocatalytic activity

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

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 Phys. -Chim. Sin. 2013, 29(02), 397-402. doi: 10.3866/PKU.WHXB201211161

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201211161

https://www.whxb.pku.edu.cn/CN/Y2013/V29/I02/397

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偏硼酸锶催化剂光催化还原CO₂合成CH₄

Photocatalytic Reduction of CO₂ into CH₄ Using SrB₂O₄ Catalyst

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