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Visible-light-sensitive nanoscale Au-ZnO photocatalysts

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Abstract
  • The role of gold nanoparticles supported on ZnO in photocatalytic activity for dye degradation was investigated. To do this, 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, ultraviolet-visible 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 2-7 nm, with an average size of 3.8 nm. The observed rate constant for MB degradation on Au-ZnO was 0.0118 min⁻¹, compared to 0.0007 min⁻¹ for pure ZnO. Furthermore, the charge transfer pathway for degradation of methylene blue in the Au-ZnO is suggested.
  • Keywords: Au/ZnO photocatalyst, Gold nanoparticle, Visible-light photocatalyst, Methylene blue degradation, Electron transfer pathway
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  • Kim, K., Kreider, P. B., Chang, C., Park, C., & Ahn, H. (2013). Visible-light-sensitive nanoscale Au–ZnO photocatalysts. Journal of Nanoparticle Research, 15(5). doi:10.1007/s11051-013-1606-5
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  • 15
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  • 5
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  • This work was financially supported by the Oregon Nanoscience and Microtechnologies Institute (ONAMI) and Oregon Built Environment & Sustainable Technologies (Oregon BEST) center.
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