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Article: Adsorption of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) on alumina: Influence of solution pH and cations

TitleAdsorption of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) on alumina: Influence of solution pH and cations
Authors
KeywordsAdsorption
Alumina
Electrostatic interaction
PFOA
PFOS
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2011, v. 45 n. 9, p. 2925-2930 How to Cite?
AbstractThe persistent nature of perfluorochemicals (PFCs) has attracted global concern in recent years. Perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) are the most commonly found PFC compounds, and thus their fate and transport play key roles in PFC distribution in the natural environment. As most solid phases in natural water contain alumina, an investigation of PFOS and PFOA adsorption behavior on alumina should prove useful in evaluating the environmental impact of this type of persistent pollutant. Systematic experiments were carried out in this study to investigate the adsorption behavior of PFOS and PFOA onto alumina. The results of adsorption kinetics on alumina show that it takes 48 h to reach equilibrium. The adsorption isotherms reveal maximum adsorption capacities of 0.252 μg/m2 for PFOS and 0.157 μg/m2 for PFOA at pH = 4.3, with the difference primarily due to their different functional groups. An increase in pH leads to a decrease in PFOS and PFOA adsorption on alumina, which may be attributed to the reduction in electrostatic interaction. The adsorption of both PFOS and PFOA decreases with an increase in ionic strength for all four types of cations (Na+, K+, Mg2+, and Ca2+), due to the compression of the electrical double layer. Furthermore, the results also indicate that both Ca2+ and Mg2+ can form bridges with PFOA anions in solution, whereas only PFOS can be bridged by Ca2+ due to the higher covalent nature of magnesium. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/139048
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU 716809E
Funding Information:

We gratefully acknowledge the funding for this research provided by the General Research Fund Scheme of the Research Grants Council of Hong Kong (HKU 716809E). The authors are also grateful to Mr. Bing Li, Mr. Ke Yu, Dr. Tong Zhang, and Ms. Vicky Fung for assisting us with the LC/MS/MS analysis. We thank Professor Xiaoyan Li for providing the zeta-potential and surface area analyzers.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWang, Fen_HK
dc.contributor.authorShih, Ken_HK
dc.date.accessioned2011-09-23T05:44:35Z-
dc.date.available2011-09-23T05:44:35Z-
dc.date.issued2011en_HK
dc.identifier.citationWater Research, 2011, v. 45 n. 9, p. 2925-2930en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139048-
dc.description.abstractThe persistent nature of perfluorochemicals (PFCs) has attracted global concern in recent years. Perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) are the most commonly found PFC compounds, and thus their fate and transport play key roles in PFC distribution in the natural environment. As most solid phases in natural water contain alumina, an investigation of PFOS and PFOA adsorption behavior on alumina should prove useful in evaluating the environmental impact of this type of persistent pollutant. Systematic experiments were carried out in this study to investigate the adsorption behavior of PFOS and PFOA onto alumina. The results of adsorption kinetics on alumina show that it takes 48 h to reach equilibrium. The adsorption isotherms reveal maximum adsorption capacities of 0.252 μg/m2 for PFOS and 0.157 μg/m2 for PFOA at pH = 4.3, with the difference primarily due to their different functional groups. An increase in pH leads to a decrease in PFOS and PFOA adsorption on alumina, which may be attributed to the reduction in electrostatic interaction. The adsorption of both PFOS and PFOA decreases with an increase in ionic strength for all four types of cations (Na+, K+, Mg2+, and Ca2+), due to the compression of the electrical double layer. Furthermore, the results also indicate that both Ca2+ and Mg2+ can form bridges with PFOA anions in solution, whereas only PFOS can be bridged by Ca2+ due to the higher covalent nature of magnesium. © 2011 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectAdsorptionen_HK
dc.subjectAluminaen_HK
dc.subjectElectrostatic interactionen_HK
dc.subjectPFOAen_HK
dc.subjectPFOSen_HK
dc.subject.meshAlkanesulfonic Acids - analysis - chemistry-
dc.subject.meshAluminum Oxide - chemistry-
dc.subject.meshFluorocarbons - analysis - chemistry-
dc.subject.meshOctanoic Acids - analysis - chemistry-
dc.subject.meshWater Pollutants, Chemical - analysis - chemistry-
dc.titleAdsorption of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) on alumina: Influence of solution pH and cationsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=45&issue=9&spage=2925&epage=2930&date=2011&atitle=Adsorption+of+perfluorooctanesulfonate+(PFOS)+and+perfluorooctanoate+(PFOA)+on+alumina:+Influence+of+solution+pH+and+cations-
dc.identifier.emailShih, K:kshih@hkucc.hku.hken_HK
dc.identifier.authorityShih, K=rp00167en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.watres.2011.03.007en_HK
dc.identifier.pmid21453951-
dc.identifier.scopuseid_2-s2.0-79954628893en_HK
dc.identifier.hkuros193065en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79954628893&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume45en_HK
dc.identifier.issue9en_HK
dc.identifier.spage2925en_HK
dc.identifier.epage2930en_HK
dc.identifier.eissn1879-2448-
dc.identifier.isiWOS:000290821700020-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectSorption of Perfluorochemicals on Sediments and Sludge of Hong Kong-
dc.identifier.scopusauthoridWang, F=37123009300en_HK
dc.identifier.scopusauthoridShih, K=14072108900en_HK
dc.identifier.citeulike9008014-

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