A comparative study on phenazone degradation by sulfate radicals based processes
| Autor: | Han Gong, Wing Yiu Lai, Jingjun Lin, Lijie Xu, Lu Gan, Wei Chu, He Gong, Qinxing Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Radical
Sulfate radicals 010501 environmental sciences Phenazone 01 natural sciences Biochemistry Mineralization (biology) 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine medicine 030212 general & internal medicine Sulfate Photodegradation 0105 earth and related environmental sciences General Environmental Science Chemistry Hydroxyl Radical Sulfates Persulfate Degradation (geology) Environmental Pollutants Oxidation-Reduction Antipyrine Water Pollutants Chemical Nuclear chemistry medicine.drug |
| Zdroj: | Environmental research. 191 |
| ISSN: | 1096-0953 |
| Popis: | In this paper, a comparative study on removal of the emerging pollutant phenazone (PNZ) by two treatment processes UVA/Fe(II)/persulfate (PS) and UVA/Fe(II)/peroxymonosulfate (PMS) was conducted. The two processes showed high efficiency in PNZ degradation, followed by a reasonable mineralization. The treatment system with PMS was found to be more efficient for PNZ degradation than that with PS due to the larger amounts of radicals generated. While the treatment process UVA/Fe(II)/PS showed higher ΔTOC/ΔSMX (TOC removal per unit of PNZ decay) than UVA/Fe(II)/PMS process. The sulfate and hydroxyl radicals played dominant roles in PNZ degradation in the UVA/Fe(II)/PS and UVA/Fe(II)/PMS process, respectively. Six and seven intermediates during PNZ degradation by UVA/Fe(II)/PS and UVA/Fe(II)/PMS process were detected, respectively. Among the detected intermediates, six of them are found for the first time. It takes shorter time for toxicity elimination by UVA/Fe(II)/PS process than UVA/Fe(II)/PMS, possibly due to the lower Kow values of hydroxylated products. The results demonstrate that UVA/Fe(II)/PMS process is more efficient in PNZ degradation, while UVA/Fe(II)/PS is more efficient in detoxification of PNZ. The two sulfate radicals based processes have good potentials in degradation, mineralization and detoxification of the emerging contaminants such as PNZ. |
| Databáze: | OpenAIRE |
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