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Catalysts 2019, 9(2), 178; https://doi.org/10.3390/catal9020178

Strong Photo-Oxidative Capability of ZnWO4 Nanoplates with Highly Exposed {0 1 1} Facets

1
School of Mathematics and Physics, Changzhou University, Jiangsu 213164, China
2
College of Physics & Electronic Information, Yunnan Normal University, Kunming 650500, China
*
Author to whom correspondence should be addressed.
Received: 17 January 2019 / Revised: 5 February 2019 / Accepted: 6 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue Nanostructured Materials for Photocatalysis)
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Abstract

ZnWO4 nanoplates with highly exposed {0 1 ¯ 1} facets were synthesized via a hydrothermal technique. The phase, morphology, and optical characteristics of ZnWO4 nanoplates were characterized with scanning electron microscopy, transmission electron microscopy, X–ray diffraction, diffuse ultraviolet–visible light (UV–Vis) reflectance spectroscopy, photoluminescence (PL) spectrophotometry, and PL lifetime spectroscopy. Optical characterizations, along with the density functional calculations, confirm that the strong blue PL band of ZnWO4 nanoplates originates from the intrinsic defects in ZnWO4 nanoplates. Furthermore, photocatalytic tests show that ZnWO4 nanoplates exhibit strong photo-oxidative capability of complete mineralization of the organic pollutant (methyl orange) in water, whereas ZnWO4 nanoparticles can only cleave the organic molecules into fragments. The superior photo-oxidative capability of ZnWO4 nanoplates can be attributed to the specific chemical bonding and stereochemistry on the exposed facets. This work demonstrates that crystal facet engineering is an efficient strategy to endow ZnWO4 with strong photo-oxidative capability. View Full-Text
Keywords: ZnWO4 nanoplates; facet engineering; photo-oxidative capability; photoluminescence ZnWO4 nanoplates; facet engineering; photo-oxidative capability; photoluminescence
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Zhai, B.-G.; Yang, L.; Zhou, F.-F.; Shi, J.-S.; Huang, Y.M. Strong Photo-Oxidative Capability of ZnWO4 Nanoplates with Highly Exposed {0 1 1} Facets. Catalysts 2019, 9, 178.

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