Degradation of eight relevant micropollutants in different water matrices by neutral photo-Fenton process under UV254 and simulated solar light irradiation – A comparative study

Neamţu, Mariana; Grandjean, Dominique; Sienkiewicz, Andrzej; Le Faucheur, Séverine; Slaveykova, Vera; Colmenares, Julia Janeth Velez; Pulgarín, César; de Alencastro, Luiz Felippe

doi:10.1016/j.apcatb.2014.04.001

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Title		Degradation of eight relevant micropollutants in different water matrices by neutral photo-Fenton process under UV254 and simulated solar light irradiation – A comparative study
Authors		Neamţu, Mariana Grandjean, Dominique Sienkiewicz, Andrzej Le Faucheur, Séverine Slaveykova, Vera Colmenares, Julia Janeth Velez Pulgarín, César de Alencastro, Luiz Felippe
Published in		Applied Catalysis. B, Environmental. 2014, vol. 158-159, p. 30-37
Abstract		This is a comparative study of photolytic degradation under exposure to UV254nm and solar-simulator irradiation of a mixture of eight equally concentrated micropollutants in the presence of H2O2 and Fe(II)in ultra-pure water, Lake Geneva water, and effluent from a wastewater treatment plant (WWTP).The electron spin resonance experiments point to a low singlet oxygen formation efficiency by the micropollutant mixture. This finding corroborates the micropollutants’ chemical stability under UVC irradiation (in decreasing order: gabapentin, metformin, metoprolol, atenolol, clarithromycin, primidone, methylbenzotriazole, and benzotriazole). The oxidation rate increased in the presence of low-concentration H2O2 and Fe(II), except for metformin and gabapentin. Gabapentin and metformin were the most persistent compounds, with less than 24% being removed after 60 min of UV254/H2O2/Fe(II) treatment. The low removal rates were observed in WWTP effluent and lake water, and using sunlightsimulation. Guanylurea, phenol, oxalic acid, tartronic acid, glycolic acid, oxamic acid, and maleic acid, could also be detected as fragmental oxidation products. Furthermore, up to 300 ug/L of nitrate and ammonia were identified as final degradation products. Ecotoxicological tests showed that the degradation products are more toxic for algae Chlamydomonas reinhardtii than the parent compounds themselves.
Keywords		Stability of micropollutants — Photo-Fenton — Solar light — NOM — Toxicity
Identifiers		DOI: 10.1016/j.apcatb.2014.04.001
Full text		Article (Published version) (913 Kb) - Limited access to UNIGE Other version: http://linkinghub.elsevier.com/retrieve/pii/S0926337314002185
Structures		Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau
Research group		Environmental Biogeochemistry and Ecotoxicology
Citation (ISO format)		NEAMŢU, Mariana et al. Degradation of eight relevant micropollutants in different water matrices by neutral photo-Fenton process under UV254 and simulated solar light irradiation – A comparative study. In: Applied Catalysis. B, Environmental, 2014, vol. 158-159, p. 30-37. doi: 10.1016/j.apcatb.2014.04.001 https://archive-ouverte.unige.ch/unige:36646