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. 2019 Feb 21;9:2522. doi: 10.1038/s41598-019-38717-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The chemical structure of (a) CV; (b) RhB; (c) MB; and (d) Mixture of dyes; including with their respective ¹H NMR spectra, before and after their photodegradation by wsGNS. Inset of all figure (a–d), shows the digital images of respective dye (a–c) and their mixture (d) before and after the photodegradation.