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Journal of Nanoparticle Research

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01-05-2013 | Research Paper

Visible-light-sensitive nanoscale Au–ZnO photocatalysts

Authors: Ki-Joong Kim, Peter B. Kreider, Chih-Hung Chang, Chul-Min Park, Ho-Geun Ahn

Published in: Journal of Nanoparticle Research | Issue 5/2013

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Abstract

The role of gold nanoparticles supported on ZnO in photocatalytic activity for dye degradation was investigated. To this end, gold nanoparticles supported on ZnO (Au–ZnO) were prepared using a simple co-precipitation method. The prepared nanocatalyst was characterized by high-resolution transmission electron microscopy, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, UV–Vis absorption, and photoluminescence. The photocatalytic activity of Au–ZnO was examined by the degradation of methylene blue in aqueous solution using a light source that has more than 95 % (i.e., energy) of emitted photons between 400 and 800 nm. Highly enhanced photocatalytic degradation of methylene blue in air at room temperature was observed from these Au–ZnO nanocatalysts with gold particle size ranging from 2 to 7 nm, with an average size of 3.8 nm. The observed rate constant for MB degradation on Au–ZnO was 0.0118/min compared with 0.0007/min for pure ZnO. Furthermore, the charge transfer pathway for the degradation of methylene blue in Au–ZnO is suggested.

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Title: Visible-light-sensitive nanoscale Au–ZnO photocatalysts
Authors: Ki-Joong Kim
Peter B. Kreider
Chih-Hung Chang
Chul-Min Park
Ho-Geun Ahn
Publication date: 01-05-2013
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 5/2013
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-013-1606-5

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