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Proceedings Paper

Zinc oxide tetrapods as efficient photocatalysts for organic pollutant degradation
Author(s): Fangzhou Liu; Yu Hang Leung; Aleksandra B. Djuriŝić; Changzhong Liao; Kaimin Shih
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Paper Abstract

Bisphenol A (BPA) and other organic pollutants from industrial wastewater have drawn increasing concern in the past decades regarding their environmental and biological risks, and hence developing strategies of effective degradation of BPA and other organic pollutants is imperative. Metal oxide nanostructures, in particular titanium oxide (TiO2) and zinc oxide (ZnO), have been demonstrated to exhibit efficient photodegradation of various common organic dyes. ZnO tetrapods are of special interest due to their low density of native defects which consequently lead to lower recombination losses and higher photocatalytic efficiency. Tetrapods can be obtained by relatively simple and low-cost vapor phase deposition in large quantity; the micron-scale size would also be advantageous for catalyst recovery. In this study, the photodegradation of BPA with ZnO tetrapods and TiO2 nanostructures under UV illumination were compared. The concentration of BPA dissolved in DI water was analyzed by high-performance liquid chromatography (HPLC) at specified time intervals. It was observed that the photocatalytic efficiency of ZnO tetrapods eventually surpassed Degussa P25 in free-standing form, and more than 80% of BPA was degraded after 60 min. Photodegradation of other organic dye pollutants by tetrapods and P25 were also examined. The superior photocatalytic efficiency of ZnO tetrapods for degradation of BPA and other organic dye pollutants and its correlation with the material properties were discussed.

Paper Details

Date Published: 13 March 2015
PDF: 6 pages
Proc. SPIE 9364, Oxide-based Materials and Devices VI, 93641W (13 March 2015); doi: 10.1117/12.2078588
Show Author Affiliations
Fangzhou Liu, The Univ. of Hong Kong (Hong Kong, China)
Yu Hang Leung, The Univ. of Hong Kong (Hong Kong, China)
Aleksandra B. Djuriŝić, The Univ. of Hong Kong (Hong Kong, China)
Changzhong Liao, The Univ. of Hong Kong (Hong Kong, China)
Kaimin Shih, The Univ. of Hong Kong (Hong Kong, China)

Published in SPIE Proceedings Vol. 9364:
Oxide-based Materials and Devices VI
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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