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Article: Zinc stabilization efficiency of aluminate spinel structure and its leaching behavior

TitleZinc stabilization efficiency of aluminate spinel structure and its leaching behavior
Authors
Issue Date2011
PublisherAmerican Chemical Society.
Citation
Environmental Science and Technology, 2011, v. 45 n. 24, p. 10544-10550 How to Cite?
AbstractThe feasibility of immobilizing zinc in contaminated soil was investigated by observing the role of zinc reacting with aluminum-rich materials under thermal conditions. To observe the process of zinc incorporation, mixtures of ZnO with alumina precursors (gamma-Al(2)O(3) and alpha-Al(2)O(3)) were fired at 750-1450 degrees C. Both precursors crystallochemically incorporated zinc into the ZnAl(2)O(4) spinel structure. The incorporation efficiencies of a 3 h sintering scheme were first quantitatively determined by Rietveld refinement analysis of X-ray diffraction data. Different zinc incorporation behavior by these two precursors was revealed, although both resulted in nearly 100% transformation at the highest temperature. Different product microstructures and thermal densification effects were found by observing the sintered products from these two precursors. The leaching performances of ZnO and ZnAl(2)O(4) were compared by a prolonged acid leaching test for 22 d. The leachability analysis pointed to superiority of the ZnAl(2)O(4) structure in stabilizing zinc, suggesting a promising technique for incorporating zinc into the aluminum-rich product. Finally, the sludge collected from water treatment works was calcined and used as an aluminum-rich material to test its ability to stabilize zinc. Successful formation of ZnAl(2)O(4) indicated good potential for employing waterworks sludge to thermally immobilize hazardous metals as a promising waste-to-resource strategy.
Persistent Identifierhttp://hdl.handle.net/10722/150631
ISSN
2015 Impact Factor: 5.393
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU 716310E
Funding Information:

This work was supported financially by the General Research Fund Scheme of the Research Grants Council of Hong Kong (HKU 716310E). Contribution of HiQ-7223 alumina by the Alcoa Corporation is gratefully acknowledged.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorTang, Yen_US
dc.contributor.authorShih, Ken_US
dc.contributor.authorWang, Yen_US
dc.contributor.authorChong, TCen_US
dc.date.accessioned2012-06-26T06:06:17Z-
dc.date.available2012-06-26T06:06:17Z-
dc.date.issued2011en_US
dc.identifier.citationEnvironmental Science and Technology, 2011, v. 45 n. 24, p. 10544-10550en_US
dc.identifier.issn0013-936Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/150631-
dc.description.abstractThe feasibility of immobilizing zinc in contaminated soil was investigated by observing the role of zinc reacting with aluminum-rich materials under thermal conditions. To observe the process of zinc incorporation, mixtures of ZnO with alumina precursors (gamma-Al(2)O(3) and alpha-Al(2)O(3)) were fired at 750-1450 degrees C. Both precursors crystallochemically incorporated zinc into the ZnAl(2)O(4) spinel structure. The incorporation efficiencies of a 3 h sintering scheme were first quantitatively determined by Rietveld refinement analysis of X-ray diffraction data. Different zinc incorporation behavior by these two precursors was revealed, although both resulted in nearly 100% transformation at the highest temperature. Different product microstructures and thermal densification effects were found by observing the sintered products from these two precursors. The leaching performances of ZnO and ZnAl(2)O(4) were compared by a prolonged acid leaching test for 22 d. The leachability analysis pointed to superiority of the ZnAl(2)O(4) structure in stabilizing zinc, suggesting a promising technique for incorporating zinc into the aluminum-rich product. Finally, the sludge collected from water treatment works was calcined and used as an aluminum-rich material to test its ability to stabilize zinc. Successful formation of ZnAl(2)O(4) indicated good potential for employing waterworks sludge to thermally immobilize hazardous metals as a promising waste-to-resource strategy.en_US
dc.languageengen_US
dc.publisherAmerican Chemical Society.en_US
dc.relation.ispartofEnvironmental Science and Technologyen_US
dc.subject.meshAluminum - chemistry-
dc.subject.meshAluminum Oxide - chemistry-
dc.subject.meshEnvironmental Remediation - methods-
dc.subject.meshWater Pollutants, Chemical - analysis - chemistry-
dc.subject.meshZinc - analysis - chemistry-
dc.titleZinc stabilization efficiency of aluminate spinel structure and its leaching behavioren_US
dc.typeArticleen_US
dc.identifier.emailTang, Y: tangyy@hku.hken_US
dc.identifier.emailShih, K: kshih@hkucc.hku.hk-
dc.identifier.emailWang, Y: ycwang@hku.hk-
dc.identifier.emailChong, TC: chong928@hku.hk-
dc.identifier.authorityShih, K=rp00167en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1021/es201660ten_US
dc.identifier.pmid22070617-
dc.identifier.scopuseid_2-s2.0-83455170788en_US
dc.identifier.hkuros205527-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-83455170788&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume45en_US
dc.identifier.issue24en_US
dc.identifier.spage10544en_US
dc.identifier.epage10550en_US
dc.identifier.eissn1520-5851-
dc.identifier.isiWOS:000298118300040-
dc.publisher.placeUnited Statesen_US
dc.relation.projectSpinel Formation in Recycling Sludge-Incineration Ash for Fabrication of Ceramic Materials-
dc.identifier.scopusauthoridChong, TC=54683533800en_US
dc.identifier.scopusauthoridWang, Y=54685419000en_US
dc.identifier.scopusauthoridShih, K=14072108900en_US
dc.identifier.scopusauthoridTang, Y=36497711600en_US

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