Mercaptopropyl magnesium phyllosilicate - thermodynamic data on the interaction with divalent cations in aqueous solution

dc.creatorFonseca, MG
dc.creatorAiroldi, C
dc.date2000
dc.dateAUG 21
dc.date2014-12-02T16:24:55Z
dc.date2015-11-26T16:11:23Z
dc.date2014-12-02T16:24:55Z
dc.date2015-11-26T16:11:23Z
dc.date.accessioned2018-03-28T22:59:53Z
dc.date.available2018-03-28T22:59:53Z
dc.identifierThermochimica Acta. Elsevier Science Bv, v. 359, n. 1, n. 1, n. 9, 2000.
dc.identifier0040-6031
dc.identifierWOS:000088330200001
dc.identifier10.1016/S0040-6031(00)00490-1
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/53602
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/53602
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/53602
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1267077
dc.descriptionMagnesium phyllosilicate (SILMgSH) was obtained by the sol-gel process involving the reaction of magnesium cation and mercaptotrialkoxysilane in aqueous basic solution at 298 K. The inorganic-organic hybrid was characterized by elemental analysis to give a presence of 4.88 mmol g(-1) of organic chains, and X-ray diffraction (XRD) patterns gave basal peaks associated with an interlayer distance of 1300 pm. The interactions between the terminal thiol groups of the organic chains of a silylating agent attached to magnesium phyllosilicate and the divalent cations copper, nickel, cobalt and zinc in aqueous solution were followed through calorimetric titrations. After subtracting the thermal effect of dilution, the net thermal effects were adjusted to a modified Langmuir equation, and the enthalpy of the interaction calculated to give the following exothermic values: -47.06+/-1.00, -27.63+/-0.50, -21.92+/-0.50 and -14.66+/-0.52 kJ mol(-1), for copper, nickel, cobalt and zinc cations, respectively. The distinct behavior of the copper cation involves the formation of a more organized compound. Gibbs free energy values changes are negative. With the exception of copper, all reactions were entropically favoured and the final products of adsorption presented an increased crystallinity clearly detected by XRD. (C) 2000 Elsevier Science B.V. All rights reserved.
dc.description359
dc.description1
dc.description1
dc.description9
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.subjectadsorption
dc.subjectphyllosilicates
dc.subjectmodified clays
dc.subjectenthalpy
dc.subjectSilica-gel Surface
dc.subjectNickel Phyllosilicate
dc.subjectNmr
dc.subjectChemisorption
dc.subjectImmobilization
dc.subjectReactivity
dc.subjectComplex
dc.subjectClays
dc.subjectSi-29
dc.titleMercaptopropyl magnesium phyllosilicate - thermodynamic data on the interaction with divalent cations in aqueous solution
dc.typeArtículos de revistas


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