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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleThermochemical investigation on the adsorption of some divalent cations on modified silicas obtained from sol-gel processpt_BR
dc.contributor.authorCestari, ARpt_BR
dc.contributor.authorVieira, EFSpt_BR
dc.contributor.authorSimoni, JDpt_BR
dc.contributor.authorAiroldi, Cpt_BR
unicamp.authorUniv Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazil Univ Fed Sergipe, CCET, Dept Quim, BR-49100000 Sao Cristovao, Sergipe, Brazilpt_BR
dc.subjectsilica gelpt_BR
dc.subjectsol-gel processpt_BR
dc.subjectimmobilisationpt_BR
dc.subjectadsorptionpt_BR
dc.subjectthermochemical datapt_BR
dc.subject.wosImmobilizationpt_BR
dc.subject.wosLigandspt_BR
dc.subject.wosChainpt_BR
dc.description.abstractSilicas with one or two immobilised ethylenediamine molecules, presenting electron donor Lewis bases, have been prepared through sol-gel method. Characterisation by various techniques indicated equivalent quantities of nitrogenated groups on both kinds of silicas. The adsorption enthalpy changes obtained from the interaction between basic sites on pendant groups and M(II) (Hg(II), Cu(II) and Co(II)} and were determined from calorimetry, carried out at 298.15 K in aqueous solution. From these determinations, the maximum capacity of adsorption (N-s), the adsorption enthalpy at different coverages of the surface (Delta(ads)H(m)) and the integral enthalpy for the maximum adsorption (Delta(sat)H(m)) were obtained. The determined energy of distribution of the adsorption sites indicates the heterogeneous adsorbentes. It is shown that N-s values are very similar for both silicas, despite the differences of the total number of immobilised groups. All reactions have favourable enthalpic contributions. Other thermodynamic quantities are discussed in terms of stability of the complexes at the solid/solution interfaces. (C) 2000 Elsevier Science B.V. All rights reserved.pt
dc.relation.ispartofThermochimica Actapt_BR
dc.relation.ispartofabbreviationThermochim. Actapt_BR
dc.publisher.cityAmsterdampt_BR
dc.publisher.countryHolandapt_BR
dc.publisherElsevier Science Bvpt_BR
dc.date.issued2000pt_BR
dc.date.monthofcirculationAPR 28pt_BR
dc.identifier.citationThermochimica Acta. Elsevier Science Bv, v. 348, n. 41671, n. 25, n. 31, 2000.pt_BR
dc.language.isoenpt_BR
dc.description.volume348pt_BR
dc.description.issuenumber41671pt_BR
dc.description.firstpage25pt_BR
dc.description.lastpage31pt_BR
dc.rightsfechadopt_BR
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policypt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0040-6031pt_BR
dc.identifier.wosidWOS:000086576800003pt_BR
dc.identifier.doi10.1016/S0040-6031(99)00380-9pt_BR
dc.date.available2014-12-02T16:29:02Z
dc.date.available2015-11-26T16:46:51Z-
dc.date.accessioned2014-12-02T16:29:02Z
dc.date.accessioned2015-11-26T16:46:51Z-
dc.description.provenanceMade available in DSpace on 2014-12-02T16:29:02Z (GMT). No. of bitstreams: 1 WOS000086576800003.pdf: 143467 bytes, checksum: 984bad374b904d788a91ab3ce9d26252 (MD5) Previous issue date: 2000en
dc.description.provenanceMade available in DSpace on 2015-11-26T16:46:51Z (GMT). No. of bitstreams: 2 WOS000086576800003.pdf: 143467 bytes, checksum: 984bad374b904d788a91ab3ce9d26252 (MD5) WOS000086576800003.pdf.txt: 20434 bytes, checksum: c9971ea1ea1fd0544d74ce4b214065e6 (MD5) Previous issue date: 2000en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/58066pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/58066
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/58066-
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