Thermochemical investigation on the adsorption of some divalent cations on modified silicas obtained from sol-gel process

dc.creatorCestari, AR
dc.creatorVieira, EFS
dc.creatorSimoni, JD
dc.creatorAiroldi, C
dc.date2000
dc.dateAPR 28
dc.date2014-12-02T16:29:02Z
dc.date2015-11-26T16:46:51Z
dc.date2014-12-02T16:29:02Z
dc.date2015-11-26T16:46:51Z
dc.date.accessioned2018-03-28T23:32:49Z
dc.date.available2018-03-28T23:32:49Z
dc.identifierThermochimica Acta. Elsevier Science Bv, v. 348, n. 41671, n. 25, n. 31, 2000.
dc.identifier0040-6031
dc.identifierWOS:000086576800003
dc.identifier10.1016/S0040-6031(99)00380-9
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/58066
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/58066
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/58066
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1274661
dc.descriptionSilicas 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.
dc.description348
dc.description41671
dc.description25
dc.description31
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationThermochimica Acta
dc.relationThermochim. Acta
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectsilica gel
dc.subjectsol-gel process
dc.subjectimmobilisation
dc.subjectadsorption
dc.subjectthermochemical data
dc.subjectImmobilization
dc.subjectLigands
dc.subjectChain
dc.titleThermochemical investigation on the adsorption of some divalent cations on modified silicas obtained from sol-gel process
dc.typeArtículos de revistas


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