Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 6, Pages 8743-8752Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.01.094
Keywords
Chemical precipitation; ZTO/ZnO composite; Visible light photocatalysis; Surface defects
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Funding
- Chair in Nanotechnology
- Research Council (TRC)
- Sultanate of Oman
- Centre of Excellence in Nanotechnology at the Asian Institute of Technology, Thailand
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Aqueous synthesis was used to obtain zinc stannate (ZTO) nanoparticles by precipitation at room temperature. Pourbaix diagrams were employed to formulate the precipitation reactions and synthesis process. Solution pH was controlled during the synthesis process as a major variable. The synthesized ZTO particles showed good photocatalytic activity under UV light irradiation. In order to improve visible light photocatalytic activity of ZTO nanoparticles, mixed phase zinc stannate/zinc oxide (ZnO) composites were prepared by co-precipitation at room temperature. Effects of precursor concentrations on the size and morphology of the obtained particles are reported. The composite ZTO/ZnO showed better photodegradation under visible light irradiation compared to ZTO and ZnO nanoparticles with methylene blue (MB) as a test chemical contaminant. Experiments were designed to elaborate on the active species for photocatalytic degradation of the dye and are reported here. Benzoquinone (BQ) was found to be the most effective scavenger, reducing the photodegradation considerably, indicating that O-2(-center dot) plays a major role in MB degradation since 50% reduction in photocatalytic activity was observed. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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