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Materials 2018, 11(7), 1127; https://doi.org/10.3390/ma11071127

Laser-Ablated ZnO Nanoparticles and Their Photocatalytic Activity toward Organic Pollutants

1
Institute of Innovative Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
2
Department of Chemistry, University of Mining and Geology, Sofia 1700, Bulgaria
3
Department of Materials Science, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
4
Research Institute of Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
*
Authors to whom correspondence should be addressed.
Received: 7 June 2018 / Revised: 27 June 2018 / Accepted: 27 June 2018 / Published: 3 July 2018
(This article belongs to the Special Issue Laser Ablation in the Synthesis of Novel Nanostructured Materials)
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Abstract

This work aimed to prepare nanostructures of ZnO with various lasers, testing them as photocatalysts, and comparing their morphology and activity in the degradation of organic pollutants in aqueous media. ZnO nanospheres (ns-ZnO) and ZnO nanorods (ms-ZnO) were prepared via the laser ablation of a Zn metal plate in water using nanosecond- and millisecond-pulsed lasers, respectively. The obtained materials were characterized using a set of optical, structural, and surface-science techniques, such as UV-vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Under visible-light irradiation, both nanostructures were found to be catalytically active toward the oxidation of methylene blue, which was used as a model compound. The ZnO nanorods fabricated with the millisecond laser showed better photocatalytic performance than their spherically shaped counterparts obtained by means of the nanosecond laser, which could be assigned to a larger number of defects on the ms-ZnO surface. View Full-Text
Keywords: ZnO; laser ablation in liquid; nanospheres; nanorods; photocatalysis ZnO; laser ablation in liquid; nanospheres; nanorods; photocatalysis
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Mintcheva, N.; Aljulaih, A.A.; Wunderlich, W.; Kulinich, S.A.; Iwamori, S. Laser-Ablated ZnO Nanoparticles and Their Photocatalytic Activity toward Organic Pollutants. Materials 2018, 11, 1127.

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