Chemisorption on thiol-silicas: Divalent cations as a function of pH and primary amines on thiol-mercury adsorbed

dc.creatorCestari, AR
dc.creatorAiroldi, C
dc.date1997
dc.date42309
dc.date2014-12-10T11:53:40Z
dc.date2015-11-26T17:42:49Z
dc.date2014-12-10T11:53:40Z
dc.date2015-11-26T17:42:49Z
dc.date.accessioned2018-03-29T00:24:48Z
dc.date.available2018-03-29T00:24:48Z
dc.identifierJournal Of Colloid And Interface Science. Academic Press Inc, v. 195, n. 2, n. 338, n. 342, 1997.
dc.identifier0021-9797
dc.identifierWOS:000071409900008
dc.identifier10.1006/jcis.1997.5157
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/63059
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/63059
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/63059
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1287415
dc.descriptionThe silylating agent 3-trimethoxysilyl-1-propanethiol was immobilized on silica gel. Sulphur analysis showed 0.98 mmol of thiol groups per gram of support. These groups chemisorbed divalent cations: nickel, cobalt, copper, and mercury in the pH range from 1 to 6. The adsorption is more significant for mercury in relation to the other cations in the pH range studied. The primary amines, methylamine, ethylamine, n-butylamine, and benzylamine, were adsorbed on silica-thiol surface and on silica-thiol surface with mercury adsorbed. The values of adsorption constants were calculated using Langmuir isotherms data. Using these values, equilibrium constants and Delta G values for each adsorption system were also obtained. When mercury is present on the silica surface, the adsorption of n-butylamine and benzylamine is significatively enhanced in relation to the other amines. This behavior suggests that the degree of adsorption of the studied amines is intimately related to their dissociation constants. (C) 1997 Academic Press.
dc.description195
dc.description2
dc.description338
dc.description342
dc.languageen
dc.publisherAcademic Press Inc
dc.publisherSan Diego
dc.publisherEUA
dc.relationJournal Of Colloid And Interface Science
dc.relationJ. Colloid Interface Sci.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectsilica gel
dc.subjectthiol-modified silica
dc.subjectimmobilization
dc.subjectchemisorption
dc.subjectprimary amines
dc.subjectmercury adsorbed silica
dc.subjectGel
dc.subjectPreconcentration
dc.subjectSorption
dc.titleChemisorption on thiol-silicas: Divalent cations as a function of pH and primary amines on thiol-mercury adsorbed
dc.typeArtículos de revistas


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