File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Effect of temperature on oxidative transformation of perfluorooctanoic acid (PFOA) by persulfate activation in water

TitleEffect of temperature on oxidative transformation of perfluorooctanoic acid (PFOA) by persulfate activation in water
Authors
KeywordsDegradation mechanism
Oxidative degradation
Perfluorochemicals
S2O82-
Sulfate radicals
Issue Date2012
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/seppur
Citation
Separation and Purification Technology, 2012, v. 91, p. 46-51 How to Cite?
AbstractPerfluorooctanoic acid (PFOA) is an emerging environmental pollutant attracting significant attention due to its global distribution, high persistence, and bioaccumulation properties. In this study, the degradation of aqueous PFOA at different temperatures was examined using heat-activated persulfate. Using this approach, 93.5% of PFOA was degraded after 30 h at 85 °C with 43.6% of F - yield, and the shorter chain length compounds (PFHpA (C 6F 13COOH), PFHxA (C 5F 11COOH), PFPeA (C 4F 9COOH), and PFBA (C 3F 7COOH)) were observed as degradation intermediates. The sequential degradation mechanism of losing one CF 2 unit from PFOA and its intermediates on a step-by-step basis were observed. Controlled temperature kinetics studies yielded an activation energy of approximately 60 kJ/mol for the degradation of PFOA by heat-activated persulfate. However, at elevated temperatures, excess persulfate is needed for efficient PFOA degradation, presumably due to more intensive SO4- scavenging. Lower reaction pH was generally found to inhibit PFOA degradation, presumably due to the more prevalent radical-to-radical interactions. © 2011 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/150668
ISSN
2015 Impact Factor: 3.299
2015 SCImago Journal Rankings: 1.100
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grants CouncilHKU 716809E
Hong Kong University Grants CouncilSEG_HKU10
National Natural Science Foundation of China40801086
Funding Information:

We acknowledge the funding for this research provided by Hong Kong Research Grants Council (Research Fund Scheme HKU 716809E), Hong Kong University Grants Council (Special Equipment Grant SEG_HKU10), and the National Natural Science Foundation of China (40801086). The authors are thankful to Ms. Vicky Fung, Dr. Bing Li, and Mr. Ke Yu for assisting with the UPLC/MS/MS analysis.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorLiu, CSen_US
dc.contributor.authorHiggins, CPen_US
dc.contributor.authorWang, Fen_US
dc.contributor.authorShih, Ken_US
dc.date.accessioned2012-06-26T06:06:37Z-
dc.date.available2012-06-26T06:06:37Z-
dc.date.issued2012en_US
dc.identifier.citationSeparation and Purification Technology, 2012, v. 91, p. 46-51en_US
dc.identifier.issn1383-5866en_US
dc.identifier.urihttp://hdl.handle.net/10722/150668-
dc.description.abstractPerfluorooctanoic acid (PFOA) is an emerging environmental pollutant attracting significant attention due to its global distribution, high persistence, and bioaccumulation properties. In this study, the degradation of aqueous PFOA at different temperatures was examined using heat-activated persulfate. Using this approach, 93.5% of PFOA was degraded after 30 h at 85 °C with 43.6% of F - yield, and the shorter chain length compounds (PFHpA (C 6F 13COOH), PFHxA (C 5F 11COOH), PFPeA (C 4F 9COOH), and PFBA (C 3F 7COOH)) were observed as degradation intermediates. The sequential degradation mechanism of losing one CF 2 unit from PFOA and its intermediates on a step-by-step basis were observed. Controlled temperature kinetics studies yielded an activation energy of approximately 60 kJ/mol for the degradation of PFOA by heat-activated persulfate. However, at elevated temperatures, excess persulfate is needed for efficient PFOA degradation, presumably due to more intensive SO4- scavenging. Lower reaction pH was generally found to inhibit PFOA degradation, presumably due to the more prevalent radical-to-radical interactions. © 2011 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/seppuren_US
dc.relation.ispartofSeparation and Purification Technologyen_US
dc.subjectDegradation mechanismen_US
dc.subjectOxidative degradationen_US
dc.subjectPerfluorochemicalsen_US
dc.subjectS2O82-en_US
dc.subjectSulfate radicalsen_US
dc.titleEffect of temperature on oxidative transformation of perfluorooctanoic acid (PFOA) by persulfate activation in wateren_US
dc.typeArticleen_US
dc.identifier.emailLiu, CS: cecsliu@hku.hken_US
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.seppur.2011.09.047en_US
dc.identifier.scopuseid_2-s2.0-84860229636en_US
dc.identifier.hkuros205528-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84860229636&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume91en_US
dc.identifier.spage46en_US
dc.identifier.epage51en_US
dc.identifier.isiWOS:000303958100007-
dc.publisher.placeUnited Kingdomen_US
dc.relation.projectSorption of Perfluorochemicals on Sediments and Sludge of Hong Kong-
dc.relation.projectEnvironmental Bio-Nano Interface (EBNI) Characterization System-
dc.identifier.scopusauthoridShih, K=14072108900en_US
dc.identifier.scopusauthoridWang, F=53364861600en_US
dc.identifier.scopusauthoridHiggins, CP=8629429300en_US
dc.identifier.scopusauthoridLiu, CS=48861430400en_US
dc.identifier.citeulike9865777-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats