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Open AccessArticle

Preparation and Photocatalytic Properties of CdS and ZnS Nanomaterials Derived from Metal Xanthate

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Research Institute of Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
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Department of Chemistry, University of Mining and Geology, Sofia 1700, Bulgaria
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Department of Materials Science, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
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Far Eastern Federal University, 690041 Vladivostok, Russia
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Institute of Automation and Control Processes, Far Eastern Branch of the Russian Academy of Science, 690091 Vladivostok, Russia
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Department of Mechanical Engineering, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(20), 3313; https://doi.org/10.3390/ma12203313
Received: 17 September 2019 / Revised: 6 October 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue New Insight into Design and Properties of Nanomaterials)
In this paper, we report a new, simple method for the synthesis of CdS and ZnS nanoparticles (NPs) prepared in a basic aqueous medium using metal xanthate as the sulfur source. The structure, morphology, size distribution, optical band gap, and photocatalytic properties of the newly obtained nanomaterials were investigated by UV-Vis spectroscopy, X-ray diffraction, and transmission electron microscopy. The results show that both CdS and ZnS crystallized in cubic phase and formed NPs with average sizes of 7.0 and 4.2 nm for CdS and ZnS, respectively. A blue shift of UV-Vis absorbance band and higher energy band gap values were observed for both materials in comparison with their bulk counterparts, which is in accordance with the quantum confinement effect. The as-prepared nanomaterials were tested in visible-light driven photocatalytic decomposition of methylene blue (MB). After irradiation for 180 min, the degradation rate of MB with a concentration of 8 × 10−6 mol/L mixed with a photocatalyst (CdS or ZnS, both 10 mg in 100 mL solution of MB) was found to be 72% and 61%, respectively. The CdS NPs showed better photocatalytic activity than ZnS, which could be explained by their lower energy band gap and thus the ability to absorb light more efficiently when activated by visible-light irradiation. View Full-Text
Keywords: ZnS nanoparticles; CdS nanoparticles; xanthate precursor; photocatalysis; visible-light activation ZnS nanoparticles; CdS nanoparticles; xanthate precursor; photocatalysis; visible-light activation
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Mintcheva, N.; Gicheva, G.; Panayotova, M.; Wunderlich, W.; Kuchmizhak, A.A.; Kulinich, S.A. Preparation and Photocatalytic Properties of CdS and ZnS Nanomaterials Derived from Metal Xanthate. Materials 2019, 12, 3313.

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