UV-activated peroxymonosulfate for haloacetamides degradation: Kinetics and reaction pathways
| Autor: | Xiaojun Fang, Xing Zhang, Tong Zhang, Wen Ma, Zhen Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Polymers and Plastics
Degradation kinetics Chemistry Radical 02 engineering and technology 021001 nanoscience & nanotechnology Photochemistry medicine.disease_cause Surfaces Coatings and Films 020401 chemical engineering medicine 0204 chemical engineering Physical and Theoretical Chemistry 0210 nano-technology Cytotoxicity Degradation pathway Genotoxicity |
| Zdroj: | Journal of Dispersion Science and Technology. 43:399-407 |
| ISSN: | 1532-2351 0193-2691 |
| Popis: | Haloacetamides (HAcAms) is ubiquitously found in drinking water, which exhibits strong cytotoxicity and genotoxicity compared with conventional disinfection byproducts (DBPs). Herein, the degradation of HAcAms containing dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) by UV/peroxymonosulfate (PMS) process was studied. Degradation kinetics of DCAcAm and TCAcAm conformed to the first-order model, and the corresponding reaction constants were 2.27 �� 10���3 and 1.94 �� 10���3 s���1, respectively. The degradation rate raised with the increment of PMS dosage. During the investigation of water matrices including Cl���, HCO3���, and humic acid (HA), HCO3��� and HA inhibited the degradation process whereas the influence of Cl��� on the degradation was negligible. As evidenced by trapping test, ���OH played the crucial role in the degradation of HAcAms. During the UV/PMS process, dechlorination was the main process. TCAcAm could be oxidized to DCAcAm and acetamide, and further mineralized to Cl���, CO2, H2O, NO2���, and NO3���. Our results demonstrated that UV/PMS could be an effective technique to degrade HAcAms in dinking water. |
| Databáze: | OpenAIRE |
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