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. 2021 May 4;18(9):4885. doi: 10.3390/ijerph18094885

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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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Evolution of TOC and $H_{2} O_{2}$ concentration (a) without UV and (b) with UV irradiation (30 ± 0.5 mg $L^{- 1}$ caffeine solutions, ${TOC}_{0}$ = 17.2 ± 1 mg $L^{- 1}$ in PLA, Timberfill^®, and Pyrex^® reactors. Experimental conditions: pH = 3 ± 0.2, $H_{2} O_{2}$ = 300 ± 10 mg $L^{- 1}$ .

Evolution of TOC and $H_{2} O_{2}$ concentration (a) without UV and (b) with UV irradiation (30 ± 0.5 mg $L^{- 1}$ caffeine solutions, ${TOC}_{0}$ = 17.2 ± 1 mg $L^{- 1}$ in PLA, Timberfill^®, and Pyrex^® reactors. Experimental conditions: pH = 3 ± 0.2, $H_{2} O_{2}$ = 300 ± 10 mg $L^{- 1}$ .