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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleInteraction of cations with SH-modified silica gel: thermochemical study through calorimetric titration and direct extent of reaction determinationpt_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,BRAZILpt_BR
dc.subject.wosPerformance Liquid-chromatographypt_BR
dc.subject.wosReversed-phasept_BR
dc.subject.wosFt-irpt_BR
dc.subject.wosSurfacept_BR
dc.subject.wosPreconcentrationpt_BR
dc.subject.wosImmobilizationpt_BR
dc.subject.wosThermodynamicspt_BR
dc.subject.wosSeparationpt_BR
dc.subject.wosComplexespt_BR
dc.subject.wosSolvationpt_BR
dc.description.abstractThe reaction of silica gel with 3-(trimethoxysilyl)propane-l-thiol, MPTS, produced a thiol-modified silica gel, Sil-SH. This material removes silver, mercury, copper, zinc and nickel ions from aqueous solutions. Enthalpy changes that occur in the interactions between Sil-SH and these cations were obtained by a calorimetric titration technique, in which thermal effects and the quantities of cations that interact at each titration point were determined simultaneously. From this procedure, values of the maximum capacity of interaction (N-3), enthalpies of interaction at different coverages of the surface [Delta(int(i))H-m] and integral enthalpy of interaction for a monolayer (Delta(mon)H(m)) have been established. It is shown that this method permits charting the basic sites created upon modification. From Delta(int(i))H-m values, the sequence of the interaction strength between the basic sites of the silica-attached MPTS and the cations is Hg2+ > Ag+ > Cu2+ > Ni2+ > Zn2+, agreement with the concept of hard and soft acids and bases. The influence of some parameters concerning the thermodynamics of solvation of the indicated transition metals has been also taken into account in the investigation of these interaction processes.pt
dc.relation.ispartofJournal Of Materials Chemistrypt_BR
dc.relation.ispartofabbreviationJ. Mater. Chem.pt_BR
dc.publisher.cityCambridgept_BR
dc.publisher.countryInglaterrapt_BR
dc.publisherRoyal Soc Chemistrypt_BR
dc.date.issued1997pt_BR
dc.date.monthofcirculationNOVpt_BR
dc.identifier.citationJournal Of Materials Chemistry. Royal Soc Chemistry, v. 7, n. 11, n. 2249, n. 2252, 1997.pt_BR
dc.language.isoenpt_BR
dc.description.volume7pt_BR
dc.description.issuenumber11pt_BR
dc.description.firstpage2249pt_BR
dc.description.lastpage2252pt_BR
dc.rightsabertopt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0959-9428pt_BR
dc.identifier.wosidWOS:A1997YG23700014pt_BR
dc.identifier.doi10.1039/a704286hpt_BR
dc.date.available2014-12-16T11:37:19Z
dc.date.available2015-11-26T16:26:25Z-
dc.date.accessioned2014-12-16T11:37:19Z
dc.date.accessioned2015-11-26T16:26:25Z-
dc.description.provenanceMade available in DSpace on 2014-12-16T11:37:19Z (GMT). No. of bitstreams: 1 WOSA1997YG23700014.pdf: 140352 bytes, checksum: 972022b34e145c66472342ec4b394271 (MD5) Previous issue date: 1997en
dc.description.provenanceMade available in DSpace on 2015-11-26T16:26:25Z (GMT). No. of bitstreams: 2 WOSA1997YG23700014.pdf: 140352 bytes, checksum: 972022b34e145c66472342ec4b394271 (MD5) WOSA1997YG23700014.pdf.txt: 21125 bytes, checksum: 274ac3d2428947a6f3a79e06f5b77542 (MD5) Previous issue date: 1997en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/60357pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/60357
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/60357-
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