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. 2020 Jan 1;13(1):171. doi: 10.3390/ma13010171

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Methylene blue (MB) concentration change (C/C₀) and degradation efficiency (%) over samples ZnS(1) and ZnS(2) during their irradiation for 180 min. Before illumination, each reaction mixture was kept in the dark for 30 min.