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Article: Pb Stabilization by a New Chemically Durable Orthophosphate Phase: Insights into the Molecular Mechanism with X-ray Structural Analysis

TitlePb Stabilization by a New Chemically Durable Orthophosphate Phase: Insights into the Molecular Mechanism with X-ray Structural Analysis
Authors
KeywordsCrystalline structure
Hexagonal structures
Interaction mechanisms
Piezoelectric technology
Selected area electronic diffraction
Issue Date2020
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag
Citation
Environmental Science & Technology, 2020, v. 54 n. 11, p. 6937-6946 How to Cite?
AbstractThe rapid progression of piezoelectric technology and the upgradation of electronic devices have resulted in a global increase in Pb-based piezoelectric ceramic materials. In this study, the feasibility of incorporating Pb into a PbZr(PO4)2 double orthophosphate structure was evaluated by investigating the interaction mechanism of the perovskite with phosphate. The unique combination of X-ray absorption spectroscopy, selected area electronic diffraction, and Pawley refinement revealed that Pb was incorporated into a hexagonal structure and tetra-coordinated with oxygen in the phosphate-treated product. The chemical durability was enhanced through the structural alterations via Zr− O−P and Pb−O−P bond linkages. The stable phase encapsulating both Pb and phosphate showed effectiveness not only in stabilizing Pb but also in inhibiting P release as a secondary pollution risk within a wide pH range (1 ≤ pH ≤ 13). Despite the excellent chemical durability of the robust PbZr(PO4)2 crystalline phase, the increased Ti doping amounts at the Zr site resulted in a slight decrease in the lattice parameters and further enhanced the Pb stabilization effect through the formation of PbZrxTi(1−x)(PO4)2 solid solutions. This study demonstrates that the newly robust crystalline structure, developed through a well-designed thermal treatment scheme, provides an effective strategy for the treatment of Pb frequently encountered in electronic wastes.
Persistent Identifierhttp://hdl.handle.net/10722/290875
ISSN
2019 Impact Factor: 7.864
2015 SCImago Journal Rankings: 2.664

 

DC FieldValueLanguage
dc.contributor.authorZhou, Y-
dc.contributor.authorZhang, J-
dc.contributor.authorLiao, C-
dc.contributor.authorChan, TS-
dc.contributor.authorLu, YR-
dc.contributor.authorChuang, YC-
dc.contributor.authorChang, CK-
dc.contributor.authorShih, K-
dc.date.accessioned2020-11-02T05:48:21Z-
dc.date.available2020-11-02T05:48:21Z-
dc.date.issued2020-
dc.identifier.citationEnvironmental Science & Technology, 2020, v. 54 n. 11, p. 6937-6946-
dc.identifier.issn0013-936X-
dc.identifier.urihttp://hdl.handle.net/10722/290875-
dc.description.abstractThe rapid progression of piezoelectric technology and the upgradation of electronic devices have resulted in a global increase in Pb-based piezoelectric ceramic materials. In this study, the feasibility of incorporating Pb into a PbZr(PO4)2 double orthophosphate structure was evaluated by investigating the interaction mechanism of the perovskite with phosphate. The unique combination of X-ray absorption spectroscopy, selected area electronic diffraction, and Pawley refinement revealed that Pb was incorporated into a hexagonal structure and tetra-coordinated with oxygen in the phosphate-treated product. The chemical durability was enhanced through the structural alterations via Zr− O−P and Pb−O−P bond linkages. The stable phase encapsulating both Pb and phosphate showed effectiveness not only in stabilizing Pb but also in inhibiting P release as a secondary pollution risk within a wide pH range (1 ≤ pH ≤ 13). Despite the excellent chemical durability of the robust PbZr(PO4)2 crystalline phase, the increased Ti doping amounts at the Zr site resulted in a slight decrease in the lattice parameters and further enhanced the Pb stabilization effect through the formation of PbZrxTi(1−x)(PO4)2 solid solutions. This study demonstrates that the newly robust crystalline structure, developed through a well-designed thermal treatment scheme, provides an effective strategy for the treatment of Pb frequently encountered in electronic wastes.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag-
dc.relation.ispartofEnvironmental Science & Technology-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.subjectCrystalline structure-
dc.subjectHexagonal structures-
dc.subjectInteraction mechanisms-
dc.subjectPiezoelectric technology-
dc.subjectSelected area electronic diffraction-
dc.titlePb Stabilization by a New Chemically Durable Orthophosphate Phase: Insights into the Molecular Mechanism with X-ray Structural Analysis-
dc.typeArticle-
dc.identifier.emailZhou, Y: yzhou223@hku.hk-
dc.identifier.emailLiao, C: liaocz@hku.hk-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acs.est.0c00643-
dc.identifier.pmid32364717-
dc.identifier.scopuseid_2-s2.0-85085903959-
dc.identifier.hkuros318187-
dc.identifier.volume54-
dc.identifier.issue11-
dc.identifier.spage6937-
dc.identifier.epage6946-
dc.publisher.placeUnited States-

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