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dc.contributor.advisorJurisson, Silvia S. (Silvia Sabine)eng
dc.contributor.authorLiu, Yongjian, 1975-eng
dc.date.issued2007eng
dc.date.submitted2007 Springeng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file (viewed on October 16, 2007)eng
dc.descriptionVita.eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionThesis (Ph. D.) University of Missouri-Columbia 2007.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Chemistry.eng
dc.description.abstract[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Technetium-99 (Tc-99) is a long-lived radionuclide of significant environmental concerns. The scope of this dissertation is to improve the understanding of Tc-99 chemistry important for potential environmental remediation. The second chapter describes the reaction between pertechnetate (TcO₄⁻) and sulfide in both anaerobic and aerobic environments, including kinetics and stoichiometry studies. Pertechnetate can be effectively immobilized by sulfide to generated Tc₂S₇ in high yield under anaerobic environments. However, the product is not sufficiently stable over the long term in the presence of O₂. The third chapter discusses the potential interference of selected coexisting species on TcO₄⁻ sulfide immobilization reaction under both aerobic and anaerobic environments. Results showed that none of them had significant effect on the immobilization process to yield Tc₂S₇ within typical concentrations found in the vadose zone. The fourth chapter examines the immobilization of TcO₄⁻ in aqueous solution under anaerobic environments by synthetic iron sulfide. This amorphous FeS was found to effectively reduce TcO₄⁻ to TcO₂ with high capacity (867 mg Tc (VII) / g FeS) and fast kinetics. The long-term stability assessment showed potential for the in situ immobilization of TcO₄⁻ under both aerobic and anaerobic environments. The fifth chapter draws the conclusions of this dissertation. The sixth chapter proposes some interesting thoughts for future studies.eng
dc.identifier.merlinb60591778eng
dc.identifier.oclc174294331eng
dc.identifier.urihttp://hdl.handle.net/10355/5961
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsAccess is limited to the campus of the University of Missouri-Columbia.eng
dc.subject.lcshTechnetiumeng
dc.subject.lcshSulfideseng
dc.subject.lcshIn situ remediationeng
dc.titlePertechnetate immobilization with sulfide in aqueous media under anaerobic and aerobic environmentseng
dc.typeThesiseng
thesis.degree.disciplineChemistry (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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