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Title: On the positive effect of UVC light during the removal of benzothiazoles by photoelectro-Fenton with UVA light
Author: Xu, Anlin
Brillas, Enric
Han, Weiqing
Wang, Lianjun
Sirés Sadornil, Ignacio
Keywords: Oxidació electroquímica
Contaminació de l'aigua
Depuració d'aigües residuals
Electrolytic oxidation
Water pollution
Purification of sewage
Issue Date: 25-Aug-2019
Publisher: Elsevier B.V.
Abstract: Benzothiazole (BTH) and 2-hydroxybenzothiazole (2-OH-BTH) are ubiquitous pollutants in aquatic ecosystems. This article reports their photoelectro-Fenton (PEF) treatment, either alone or mixed, in sulfate medium at pH 3.0 using an IrO2-based/air diffusion cell that generates H2O2 under UVA and/or UVC irradiation. UVC-PEF was more effective than UVA-PEF to remove the target pollutants, which suggests a positive impact of OH formed via Fenton's reaction and photo-induced homolysis of H2O2 in the former method. In addition, BTH disappeared more quickly than 2-OH BTH. Full-time UVA-/UVC-PEF outperformed UVC-PEF and UVA-PEF to mineralize the mixtures, although requiring a much higher energy consumption. The evolution of generated H2O2 and homogeneous OH confirmed the positive contribution of UVC photolysis in UVA-PEF. Part-time use of UVC radiation in UVA-PEF yielded a similar total organic carbon removal, with much lower energy consumption. BTH was oxidized to 2-OH-BTH, which was subsequently transformed into other five heteroaromatics.
Note: Versió postprint del document publicat a:
It is part of: Applied Catalysis B-Environmental, 2019, vol. 259, p. 118127
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ISSN: 0926-3373
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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