Journal
CATALYSIS TODAY
Volume 175, Issue 1, Pages 256-263Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2011.02.055
Keywords
CO2 reduction; Photocatalyst; AgBr/TiO2; Visible light
Funding
- National Natural Science Foundation of China [20877025]
- Fundamental Research Funds for the Central Universities [09lgpy20]
- Education Ministry of China [200805611015]
- Project from Guangzhou City [2010Z2-C1009]
- Ministry of Science and Technology of China [10C26214414753]
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [2011K0003]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars from State Education Ministry
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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.
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