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. 2020 Feb 8;13(3):782. doi: 10.3390/ma13030782

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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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SEM of the ground tire rubber (GTR) particles surface: (a) untreated and treated with: (b) perchloric acid (HClO₄), (c) nitric acid (HNO₃), and (d) sulphuric acid (H₂SO₄). Adapted with permission from [89]; copyright 2019 Elsevier Ltd.