Spectroscopic characterization of the reduction and removal of chromium (VI) by tropical peat and humin

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dc.contributor.authorCerqueira, S. da C. A.
dc.contributor.authorRomao, L. P. C.
dc.contributor.authorLucas, S. C. O.
dc.contributor.authorFraga, L. E. [UNESP]
dc.contributor.authorSimoes, M. L.
dc.contributor.authorHammer, Peter [UNESP]
dc.contributor.authorLead, J. R.
dc.contributor.authorMangoni, A. P.
dc.contributor.authorMangrich, A. S.
dc.contributor.institutionUniversidade Federal de Sergipe (UFS)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.institutionUniv Birmingham
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)
dc.contributor.institutionNatl Inst Sci & Technol Energy & Environm
dc.date.accessioned2014-05-20T14:18:19Z
dc.date.available2014-05-20T14:18:19Z
dc.date.issued2012-01-01
dc.description.abstractThe reduction of Cr(VI) to Cr(III) in aqueous solution, and the subsequent removal of Cr(III) using in natura peat or its humin fraction, was characterized by electron paramagnetic resonance (EPR), ultraviolet-visible (UV-Vis) spectroscopy and X-ray photoelectron (XPS) spectroscopy. EPR spectroscopy g-factors ranging from 2.0029 to 2.0030 indicated the presence of organic free radicals (OFR) associated with carbon atoms. The spin densities of the samples increased with pH in the range pH 2.0-pH 6.0. An XPS spectroscopy peak at 579.0 eV was attributed to Cr(VI), and peaks at 576.8 eV and 677.3 eV to two different chemical forms of Cr(III). Removal of chromium increased with the reduction of Cr(VI) to Cr(III), and removal rates after 50 h were 13% (peat) and 15% (humin) at pH 6.0, and 70% (peat) and 80% (humin) at pH 2.0. The greater efficiency of the humin fraction in the reduction/removal process is discussed in terms of the chemical structures of these materials. (C) 2011 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUniv Fed Sergipe, Dept Chem, BR-49100000 Sao Cristovao, SE, Brazil
dc.description.affiliationSão Paulo State Univ UNESP, Dept Analyt Chem, Inst Chem, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Instrumentacao Agr, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationSão Paulo State Univ UNESP, Inst Chem, Dept Phys Chem, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUniv Birmingham, Div Environm Hlth & Risk Management, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England
dc.description.affiliationFed Univ Parana UFPR, Dept Chem, BR-80060000 Curitiba, PR, Brazil
dc.description.affiliationNatl Inst Sci & Technol Energy & Environm, BR-40170290 Salvador, BA, Brazil
dc.description.affiliationUnespSão Paulo State Univ UNESP, Dept Analyt Chem, Inst Chem, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ UNESP, Inst Chem, Dept Phys Chem, BR-14800900 Araraquara, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 201185/2003-2
dc.format.extent141-146
dc.identifierhttp://dx.doi.org/10.1016/j.fuel.2011.06.023
dc.identifier.citationFuel. Oxford: Elsevier B.V., v. 91, n. 1, p. 141-146, 2012.
dc.identifier.doi10.1016/j.fuel.2011.06.023
dc.identifier.issn0016-2361
dc.identifier.lattes6466841023506131
dc.identifier.orcid0000-0002-3823-0050
dc.identifier.urihttp://hdl.handle.net/11449/25510
dc.identifier.wosWOS:000296532400016
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofFuel
dc.relation.ispartofjcr4.908
dc.relation.ispartofsjr1,891
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectPeaten
dc.subjectHuminen
dc.subjectChromium uptakeen
dc.subjectEPR spectroscopyen
dc.subjectXPS spectroscopyen
dc.titleSpectroscopic characterization of the reduction and removal of chromium (VI) by tropical peat and huminen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes6466841023506131(6)
unesp.author.orcid0000-0002-3823-0050(6)
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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