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. 2021 Nov 18;9(11):313. doi: 10.3390/toxics9110313

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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Illustration of various methods to develop biochar-supported TiO₂ nanocomposite material for photocatalysis: (A) Sol-gel method, (B) Ultra sound method, (C) Thermal Polycondensation method, and (D) Solvothermal method for the synthesis of biochar supported TiO₂ nanocomposite (reproduced from [73] Copyright year 2018, RSC Advances with permission under Creative Commons Attribution 3.0 Unported Licence).