Transformation of 6:2 Fluorotelomer Sulfonate by Cobalt(II)-Activated Peroxymonosulfate
Zhang, Y; Liu, J; Moores, A; Ghoshal, S
| HERO ID | 6326944 |
|---|---|
| In Press | No |
| Year | 2020 |
| Title | Transformation of 6:2 Fluorotelomer Sulfonate by Cobalt(II)-Activated Peroxymonosulfate |
| Authors | Zhang, Y; Liu, J; Moores, A; Ghoshal, S |
| Journal | Environmental Science & Technology |
| Volume | 54 |
| Issue | 7 |
| Page Numbers | 4631-4640 |
| Abstract | Peroxymonosulfate (PMS)-based advanced oxidation processes generate highly reactive SO4•- and are promising for water treatment. In this study, we investigated the reaction mechanism of 6:2 fluorotelomer sulfonate (6:2 FTS) with Co2+-activated PMS. 6:2 FTS was simultaneously transformed to perfluoroalkyl carboxylic acids (C2-C7 PFCAs) of different chain lengths, with perfluorohexanoic acid (C6) as the predominant one. The mass balance of the intermediates and products versus the initially added 6:2 FTS was close to 100% over the reaction period. Using chemical scavenging methods, we identified that •OH, instead of SO4•-, was the oxidant initiating the reaction of 6:2 FTS. •OH was mainly produced from SO4•- reacting with H2O. Thus, the reactivity of 6:2 FTS was controlled by the factors affecting the production and scavenging of both SO4•- and •OH. Density functional theory calculations showed that •OH oxidizes 6:2 FTS by H-abstraction from ethyl carbons. This is the first study that demonstrates that •OH in Co2+-activated PMS can play a significant role in contaminant transformations. The results indicate that great caution should be taken when PMS or other agents that generate •OH are used for the treatment of water containing 6:2 FTS or its structural analogs. |
| Doi | 10.1021/acs.est.9b07113 |
| Pmid | 32062971 |
| Wosid | WOS:000526418000094 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Scopus URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081950983&doi=10.1021%2facs.est.9b07113&partnerID=40&md5=3bba1a18c98143000e282f1211f89a9e |
| Is Public | Yes |
| Language Text | English |