Photocatalytic reduction of CO2 to hydrocarbons using AgBr/TiO2 nanocomposites under visible light
Photocatalytic reduction of CO2 to hydrocarbons using AgBr/TiO2 nanocomposites under visible light
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DOI：
10.1016/j.cattod.2011.02.055
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发表时间：
2011-10-25
期刊：
影响因子：
5.3
通讯作者：
Li, Xiang-zhong
中科院分区：
文献类型：
--
作者：
Abou Asi, Mudar;He, Chun;Li, Xiang-zhong
迫切需要开发有效和低成本的二氧化碳减排技术，以解决大气二氧化碳和化石燃料枯竭造成的全球变暖问题。在这项调查中，有效的光催化还原CO2使用AgBr/TiO 2在可见光下（λ> 420 nm）进行了研究。以十六烷基三甲基溴化铵（CTAB）为催化剂，采用沉积-沉淀法制备了AgBr/TiO 2纳米光催化剂，并通过X射线衍射（XRD）、漫反射光谱（DRS）、扫描电镜（SEM）和透射电镜（TEM）等手段对其进行了表征。通过在CO2和水存在下的还原率评价了它们的光催化活性。实验结果表明，23.2% AgBr/TiO 2在可见光照射下还原5 h具有较高的还原产率，甲烷产率为128.56，甲醇产率为77.87，乙醇产率为13.28，CO产率为32.14 μ mol g（-1）。AgBr/TiO 2在可见光区的强吸收是其在CO2还原过程中高效光催化活性的主要原因。此外，研究发现，由于光激发电子从分散良好的AgBr的导带转移到TiO 2的导带，AgBr/TiO 2光催化剂在可见光照射下重复使用时保持稳定。(C)2011爱思唯尔有限公司版权所有。
Urgent development of effective and low-cost technologies for reduction CO2 is needed to address global warming caused by atmospheric CO2 and the depletion of fossil fuels. In this investigation, an effective photocatalytic reduction of CO2 using AgBr/TiO2 photocatalyst under visible light (lambda > 420 nm) was studied. The nanostructured AgBr/TiO2 photocatalyst was prepared by the deposition-precipitation method in the presence of cetyltrimethylammonium bromide (CTAB), and characterized by X-ray diffraction (XRD), diffuse reflectance spectra (DRS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Their photocatalytic activities were evaluated by the reduction yield in the presence of CO2 and water. The experiment results showed that 23.2% AgBr/TiO2 had relatively high reduction yields under visible-light irradiation for 5 h, with a methane yield of 128.56, methanol yield of 77.87, ethanol yield of 13.28, and CO yield of 32.14 mu mol g(-1), respectively. The highly efficiently photocatalytic activities of AgBr/TiO2 in the reduction process of CO2 is attributed to its strong absorption in the visible-light region. In addition, it was found that AgBr/TiO2 photocatalyst was stable in the repeated uses under visible light irradiation, due to the transfer of photoexcited electrons from the conduction band of well-dispersed AgBr to that of TiO2. (C) 2011 Elsevier B.V. All rights reserved.