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Article: Formation of Lead Ferrites for Immobilizing Hazardous Lead into Iron-Rich Ceramic Matrix

TitleFormation of Lead Ferrites for Immobilizing Hazardous Lead into Iron-Rich Ceramic Matrix
Authors
KeywordsLead
Stabilization
Lead ferrite
Mechanism
Crystal transformation
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere
Citation
Chemosphere, 2019, v. 214, p. 239-249 How to Cite?
AbstractA strategy of immobilizing lead in the framework of ferrite-ceramic matrix, to reduce its environmental hazard was explored in this study. The mechanisms of incorporating lead into lead ferrites (delta-phase (2PbO center dot Fe2O3), gamma-phase (PbO center dot(2-2.5)Fe2O3) and beta-phase (PbO center dot(5-6)Fe2O3)) was revealed by observing the phase transformation in the products. The beta-phase was dominantly formed at low temperature of 700-800 degrees C at Pb/Fe of 1/1 -1/3. The significant growth of gamma-phase was observed at 750-850 degrees C and Pb/Fe of 1/4-1/7. The beta-phase substantially formed at 900-1000 degrees C with Pb/Fe of 1/7-1/12. The transformation of delta-phase to gamma-phase and/or beta-phase indicated the destruction of delta-phase unit and reconstruction of gamma-phase and beta-phase units during sintering process. However, the transformation of gamma-phase into beta-phase suggested a structure conversion process, local structural changes arose as a consequence of the addition of Fe2O3. When comparing the leaching ability of delta-, gamma- and beta-phase, the results showed the superiority of beta-phase for lead immobilization over the longer leaching period. (C) 2018 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/274872
ISSN
2017 Impact Factor: 4.427
2015 SCImago Journal Rankings: 1.536
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLu, X-
dc.contributor.authorYang, J-
dc.contributor.authorNing, XA-
dc.contributor.authorShih, K-
dc.contributor.authorWang, F-
dc.contributor.authorChao, Y-
dc.date.accessioned2019-09-10T02:30:37Z-
dc.date.available2019-09-10T02:30:37Z-
dc.date.issued2019-
dc.identifier.citationChemosphere, 2019, v. 214, p. 239-249-
dc.identifier.issn0045-6535-
dc.identifier.urihttp://hdl.handle.net/10722/274872-
dc.description.abstractA strategy of immobilizing lead in the framework of ferrite-ceramic matrix, to reduce its environmental hazard was explored in this study. The mechanisms of incorporating lead into lead ferrites (delta-phase (2PbO center dot Fe2O3), gamma-phase (PbO center dot(2-2.5)Fe2O3) and beta-phase (PbO center dot(5-6)Fe2O3)) was revealed by observing the phase transformation in the products. The beta-phase was dominantly formed at low temperature of 700-800 degrees C at Pb/Fe of 1/1 -1/3. The significant growth of gamma-phase was observed at 750-850 degrees C and Pb/Fe of 1/4-1/7. The beta-phase substantially formed at 900-1000 degrees C with Pb/Fe of 1/7-1/12. The transformation of delta-phase to gamma-phase and/or beta-phase indicated the destruction of delta-phase unit and reconstruction of gamma-phase and beta-phase units during sintering process. However, the transformation of gamma-phase into beta-phase suggested a structure conversion process, local structural changes arose as a consequence of the addition of Fe2O3. When comparing the leaching ability of delta-, gamma- and beta-phase, the results showed the superiority of beta-phase for lead immobilization over the longer leaching period. (C) 2018 Elsevier Ltd. All rights reserved.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere-
dc.relation.ispartofChemosphere-
dc.subjectLead-
dc.subjectStabilization-
dc.subjectLead ferrite-
dc.subjectMechanism-
dc.subjectCrystal transformation-
dc.titleFormation of Lead Ferrites for Immobilizing Hazardous Lead into Iron-Rich Ceramic Matrix-
dc.typeArticle-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.chemosphere.2018.09.121-
dc.identifier.pmid30265931-
dc.identifier.scopuseid_2-s2.0-85054609368-
dc.identifier.hkuros303606-
dc.identifier.volume214-
dc.identifier.spage239-
dc.identifier.epage249-
dc.identifier.isiWOS:000449891300028-
dc.publisher.placeUnited Kingdom-

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