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. 2020 Dec 4;10:21262. doi: 10.1038/s41598-020-78070-2

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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A schematic illustration of the synthesis procedure for graphene quantum dots (GQDs). Spent tea waste is subjected to pyrolysis treatment and carbon rich biochar is obtained, which is then microwave treated to produce GQDs with high yield. Figure was drawn using ChemDraw v16 (https://www.perkinelmer.com), Adobe Photoshop 2019 (https://www.adobe.com) and Microsoft PowerPoint 2016 (https://www.microsoft.com).