Biogenic Synthesis, Photocatalytic, and Photoelectrochemical Performance of Ag-ZnO Nanocomposite

Title
Biogenic Synthesis, Photocatalytic, and Photoelectrochemical Performance of Ag-ZnO Nanocomposite
Author(s)
조무환이진태칸모하마드만숩모드안사리사지드안자리
Keywords
ELECTROCHEMICALLY ACTIVE BIOFILM; VISIBLE-LIGHT; BAND-GAP; SILVER NANOPARTICLES; OXIDE NANOPARTICLES; HYDROGEN-PRODUCTION; GOLD NANOPARTICLES; HIGHLY EFFICIENT; BIO-HYDROGEN; ZINC-OXIDE
Issue Date
201312
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.117, no.51, pp.27023 - 27030
Abstract
The development of coupled photoactive materials (metal/semiconductor) has resulted in significant advancements in heterogeneous visible light photocatalysis. This work reports the novel biogenic synthesis of visible light active Ag-ZnO nanocomposite for photocatalysis and photoelectrode using an electrochemically active biofilm (EAB). The results showed that the EAB functioned as a biogenic reducing tool for the reduction of Ag+, thereby eliminating the need for conventional reducing agents. The as-prepared Ag-ZnO nanocomposite was characterized by X-ray diffraction, transmission electron microscopy, diffuse reflectance spectroscopy, photoluminescence spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic experiments showed that the Ag-ZnO nanocomposite possessed excellent visible light photocatalytic activity for the degradation of methyl orange, methylene blue, and 4-nitrophenol. Electrochemical impedance spectroscopy and linear scan voltammetry under dark and visible light irradiation confirmed the enhanced visible light activity of the Ag-ZnO as photocatalyst and photoelectrode. These results suggest that Ag nanoparticles induced visible light photocatalytic degradation and enhanced the visible light activity of the photoelectrodes by minimizing the recombination of photogenerated electrons and holes, thereby extending the response of pure ZnO to visible light.
URI
http://hdl.handle.net/YU.REPOSITORY/28160http://dx.doi.org/10.1021/jp410063p
ISSN
1932-7447
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공과대학 > 화학공학부 > Articles
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