Journal
CATALYSIS TODAY
Volume 216, Issue -, Pages 268-275Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2013.05.021
Keywords
Ag@AgBr/CNT; Visible-light; CO2 reduction; Chemical fuels; Photoconversion
Funding
- National Natural Science Foundation of China [20877025, 21273085]
- National Natural Science Foundation of Guangdong Province [S2011010001836, S2011010003416]
- Fundamental Research Funds for the Central Universities [09lgpy20]
- Science and Technology Research Project from Guangzhou City [12A42091603, 2010Z2-C1009]
- Ministry of Science and Technology of China [10C26214414753]
- Research Fund Program of Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [2011K0003]
- Project from Education Bureau of Guangdong Province [2010-275]
- Guangdong Province Science and Technology Bureau [2010B090400552]
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This paper presents the synthesis of visible-light-harvesting photocatalyst, Ag@AgBr/carbon nanotubes (CNT) nanocomposites, by the photoreduction of AgBr/CNT, which was independently prepared by the deposition-precipitation method. Nanocomposites with different carbon tubes lengths were characterized by X-ray diffraction, BrunauerEmmettTeller (BET) surface area, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy (EIS) techniques. Ag@AgBr nanopaparticles were found to be anchored onto the surface of CNT. EIS measurements suggested that the longer CNT in Ag@AgBr/CNT were more efficient in transporting charges than that of the shorter length CNT, which agreed with the observed trend of photocatalytic reduction of CO2 under visible light (lambda > 420 nm) (Ag@AgBr/CNT-L > Ag@AgBr/CNT-M > Ag@AgBr/CNT-S). The study on the photocatalytic reduction of CO2 to methane, CO, methanol, and ethanol suggested that the reduction process favored under neutral and weak alkaline conditions. Ag@AgBr/CNT can maintain the high stability in five repeated uses. (C) 2013 Elsevier B.V. All rights reserved.
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