Photodegradation of fluorotelomer carboxylic 5:3 acid and perfluorooctanoic acid using zinc oxide
Abada, B; Alivio, TEG; Shao, Y; O'Loughlin, TE; Klemashevich, C; Banerjee, S; Jayaraman, A; Chu, KH
| HERO ID | 5080284 |
|---|---|
| In Press | No |
| Year | 2018 |
| Title | Photodegradation of fluorotelomer carboxylic 5:3 acid and perfluorooctanoic acid using zinc oxide |
| Authors | Abada, B; Alivio, TEG; Shao, Y; O'Loughlin, TE; Klemashevich, C; Banerjee, S; Jayaraman, A; Chu, KH |
| Journal | Environmental Pollution |
| Volume | 243 |
| Issue | Pt A |
| Page Numbers | 637-644 |
| Abstract | Occurrence of per- and poly-fluoroalkyl substances (PFASs) in the environment and biota has raised a great concern to public health because these compounds are persistent, bioaccumulative, and toxic. Biodegradation of polyfluoroalkyl substances, particularly long-chain fluorotelomer-based products, can lead to production of various short-chain PFASs, with 5:3 fluorotelomer carboxylic acid (referred as 5:3 FTCA hereafter) as a dominant polyfluoroalkyl metabolite. Perfluoroalkyl acids, particularly perfluorooctanoic acid (PFOA), are toxic and current removal methods are not cost-effective. This study reports the photodegradation of 5:3 FTCA and PFOA using ZnO as a photocatalyst under neutral pH and room temperature conditions. Under long UV wavelength (365 nm), both tetrapod and commercial ZnO can photodegrade 5:3 FTCA. Five removal products-perfluorohexanoic acid, perfluoropentanoic acid, perfluorobutyric acid, 5:2 fluorotelomer carboxylic acid (5:2 FTCA), and inorganic fluoride-were identified, with PFBA and F- as dominant end products. SEM and XPS high-resolution scans on the surface of the utilized ZnO showed less units of CF2 than that in 5:3 FTCA, supporting occurrence of photodegradation of 5:3 FTCA by ZnO. Defluorination of PFOA was not observed with ZnO only, but at pH 5 and in the co-presence of Fe-citrate. PFOA defluorination increased from 0.93% after 3 days of UV light exposure to 3.9% after additional 135 h under direct sunlight exposure. To the authors' best knowledge, this is the first report studying ZnO-catalyzed photodegradation of 5:3 FTCA, and examining the Fe co-addition for PFOA defluorination. |
| Doi | 10.1016/j.envpol.2018.09.023 |
| Pmid | 30219589 |
| Wosid | WOS:000449891800069 |
| Url | https://www.proquest.com/docview/2189524406?accountid=171501&bdid=107858&_bd=Vi0v2TlQwtsOjy9XNjo8dyXEO9I%3D |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Scopus URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053181505&doi=10.1016%2fj.envpol.2018.09.023&partnerID=40&md5=9a1466ec2ea9981842d3cb235810ecde |
| Is Public | Yes |
| Language Text | English |
| Keyword | Tetrapod ZnO; Defluorination; Poly and per-fluoroalkyl substances (PFASs).; 5:3 FTCA; 5:2 FTCA; PFOA |