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Article: Influence of calcium hydroxide on the fate of perfluorooctanesulfonate under thermal conditions

TitleInfluence of calcium hydroxide on the fate of perfluorooctanesulfonate under thermal conditions
Authors
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhazmat
Citation
Journal of Hazardous Materials, 2011, v. 192 n. 3, p. 1067-1071 How to Cite?
AbstractTo explore the potential fate and transport of perfluorochemicals in the thermal treatment of sludge, perfluorooctanesulfonate (PFOS), a perfluorochemical species commonly dominant in wastewater sludge, was mixed with hydrated lime (Ca(OH)(2)) to quantitatively observe their interaction under different temperatures. The phase compositions of the mixtures after the reactions were qualitatively identified and quantitatively determined using X-ray diffraction technique. The results of the thermogravimetry and differential scanning calorimetry analyses indicate that PFOS gasified directly during the thermal treatment process when the temperature was increased to around 425 degrees C. However, the formation of CaF(2) at 350 degrees C suggests that the presence of Ca(OH)(2) in the mixture can lead to the decomposition of PFOS at 350 degrees C, which is lower than the decomposition temperature of PFOS alone (425 degrees C). The increase of temperature promoted a solid state reaction between PFOS and Ca(OH)(2), and also enhanced the interaction between the gaseous products of PFOS and CaO (or Ca(OH)(2)). The preferred Ca/F molar ratio to achieve fluorine stabilization by Ca(OH)(2) was above 1:1 in the experiment involving 400 degrees C and 600 degrees C treatment. It also showed that equilibrium efficiency is achieved within 5 min at 400 degrees C and within 1 min above 600 degrees C.
Persistent Identifierhttp://hdl.handle.net/10722/150588
ISSN
2015 Impact Factor: 4.836
2015 SCImago Journal Rankings: 1.692
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).

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWang, Fen_US
dc.contributor.authorLu, Xen_US
dc.contributor.authorShih, Ken_US
dc.contributor.authorLiu, Cen_US
dc.date.accessioned2012-06-26T06:05:57Z-
dc.date.available2012-06-26T06:05:57Z-
dc.date.issued2011en_US
dc.identifier.citationJournal of Hazardous Materials, 2011, v. 192 n. 3, p. 1067-1071en_US
dc.identifier.issn0304-3894en_US
dc.identifier.urihttp://hdl.handle.net/10722/150588-
dc.description.abstractTo explore the potential fate and transport of perfluorochemicals in the thermal treatment of sludge, perfluorooctanesulfonate (PFOS), a perfluorochemical species commonly dominant in wastewater sludge, was mixed with hydrated lime (Ca(OH)(2)) to quantitatively observe their interaction under different temperatures. The phase compositions of the mixtures after the reactions were qualitatively identified and quantitatively determined using X-ray diffraction technique. The results of the thermogravimetry and differential scanning calorimetry analyses indicate that PFOS gasified directly during the thermal treatment process when the temperature was increased to around 425 degrees C. However, the formation of CaF(2) at 350 degrees C suggests that the presence of Ca(OH)(2) in the mixture can lead to the decomposition of PFOS at 350 degrees C, which is lower than the decomposition temperature of PFOS alone (425 degrees C). The increase of temperature promoted a solid state reaction between PFOS and Ca(OH)(2), and also enhanced the interaction between the gaseous products of PFOS and CaO (or Ca(OH)(2)). The preferred Ca/F molar ratio to achieve fluorine stabilization by Ca(OH)(2) was above 1:1 in the experiment involving 400 degrees C and 600 degrees C treatment. It also showed that equilibrium efficiency is achieved within 5 min at 400 degrees C and within 1 min above 600 degrees C.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhazmaten_US
dc.relation.ispartofJournal of Hazardous Materialsen_US
dc.subject.meshAlkanesulfonic Acids - chemistryen_US
dc.subject.meshCalcium - analysis - chemistryen_US
dc.subject.meshCalcium Hydroxide - chemistryen_US
dc.subject.meshFluorocarbons - chemistryen_US
dc.subject.meshWater Purification - methodsen_US
dc.titleInfluence of calcium hydroxide on the fate of perfluorooctanesulfonate under thermal conditionsen_US
dc.typeArticleen_US
dc.identifier.emailShih, K: kshih@hku.hken_US
dc.identifier.emailLiu, C: cecsliu@hku.hk-
dc.identifier.authorityShih, K=rp00167en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jhazmat.2011.06.009en_US
dc.identifier.pmid21719193-
dc.identifier.scopuseid_2-s2.0-80052038196en_US
dc.identifier.hkuros205544-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80052038196&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume192en_US
dc.identifier.issue3en_US
dc.identifier.spage1067en_US
dc.identifier.epage1071en_US
dc.identifier.isiWOS:000295236800018-
dc.publisher.placeNetherlandsen_US
dc.relation.projectSorption of Perfluorochemicals on Sediments and Sludge of Hong Kong-
dc.identifier.scopusauthoridLiu, C=50461770400en_US
dc.identifier.scopusauthoridShih, K=14072108900en_US
dc.identifier.scopusauthoridLu, X=34168040600en_US
dc.identifier.scopusauthoridWang, F=37123009300en_US
dc.identifier.citeulike9768887-

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