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

Paper ID Volume ID Publish Year Pages File Format Full-Text
45851 46426 2014 8 PDF Available
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
Abstract

•The photocatalytic stability of micropollutants in different matrices is presented.•The ESR experiments point to a low efficiency of singlet oxygen formation.•Gabapentin and metformin were the most persistent compounds.•The degradation products are more toxic than the parent compounds themselves.

This is a comparative study of photolytic degradation under exposure to UV254 nm 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 sunlight simulation.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 μg/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.

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Keywords
Stability of micropollutants; Photo-Fenton; Solar light; NOM; Toxicity
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Degradation of eight relevant micropollutants in different water matrices by neutral photo-Fenton process under UV254 and simulated solar light irradiation – A comparative study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 30–37
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us