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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, Brunauer-Emmett-Teller (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 CO 2 under visible light ( > 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. 2013 Elsevier B.V.
author list (cited authors)
Abou Asi, M., Zhu, L., He, C., Sharma, V. K., Shu, D., Li, S., Yang, J., & Xiong, Y. a.