Hybrid silica-organic material with immobilized amino groups: surface probing and use for electrochemical determination of nitrite ions

dc.creatorTkachenko, O
dc.creatorRahim, A
dc.creatorBaraban, A
dc.creatorSukhov, R
dc.creatorKhristenko, I
dc.creatorGushikem, Y
dc.creatorKholin, Y
dc.date2013
dc.dateJUL
dc.date2014-07-30T17:59:37Z
dc.date2015-11-26T16:48:19Z
dc.date2014-07-30T17:59:37Z
dc.date2015-11-26T16:48:19Z
dc.date.accessioned2018-03-28T23:34:44Z
dc.date.available2018-03-28T23:34:44Z
dc.identifierJournal Of Sol-gel Science And Technology. Springer, v. 67, n. 1, n. 145, n. 154, 2013.
dc.identifier0928-0707
dc.identifierWOS:000322137600017
dc.identifier10.1007/s10971-013-3060-3
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/68960
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/68960
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1275108
dc.descriptionHybrid silica-organic material with fixed n-propylamine groups was prepared by a sol-gel route and characterized by several techniques. Specific surface area of the material was 110 +/- A 2 m(2) g(-1), specific pore volume was 0.90 +/- A 0.01 cm(3) g(-1), and average pore size was 25 +/- A 3 nm. The specific concentration of attached amino groups was 3.28 +/- A 0.05 mmol g(-1), the amount of residual silanol groups being comparable with that of amino groups. The maximum attainable adsorption of H+ ions was 2.34 +/- A 0.10 mmol g(-1). The Dimroth-Reichardt normalized polarity parameter of the near-surface layer was 0.64 that points to the closeness of properties of the near-surface layer to those of water-organic mixtures and polar organic solvents rather than aqueous solutions. Surface probing with H+ ions has revealed that due to interactions between surface amino groups and weakly acidic silanol groups the protonization constants of fixed amino groups are considerably smaller than the protonization constants of aliphatic amines in aqueous solutions. The equimolecular composition of Cu (II) complexes with immobilized amino groups was concluded from the results of surface probing with Cu2+ ions and UV-vis diffuse reflectance spectroscopy. The stability constants of Cu (II) complexes were determined with the aid of the model of polydentate binding, and the influence of strong negative cooperativity effects on the adsorption equilibria was detected. The material with sorbed Cu (II) ions was used to prepare a working electrode for the electrochemical determination of nitrite ions. The electrocatalytic determination of nitrite ions in aqueous media may be performed by means of cyclic voltammetry, differential pulse voltammetry and chronoamperometry with the limits of detection 1.3, 4.6, and 3.1 mu mol l(-1), correspondingly.
dc.description67
dc.description1
dc.description145
dc.description154
dc.descriptionMinistry of Education and Science of Ukraine [0109U001310]
dc.descriptionMinistry of Education and Science of Ukraine [0109U001310]
dc.languageen
dc.publisherSpringer
dc.publisherDordrecht
dc.publisherHolanda
dc.relationJournal Of Sol-gel Science And Technology
dc.relationJ. Sol-Gel Sci. Technol.
dc.rightsfechado
dc.rightshttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dc.sourceWeb of Science
dc.subjectHybrid silica-organic material
dc.subjectProbing
dc.subjectNitrite
dc.subjectElectrochemical determination
dc.subjectCarbon-ceramic Electrode
dc.subjectMesoporous Silica
dc.subjectPaste Electrode
dc.subjectReduction
dc.subjectOxide
dc.subjectEquilibria
dc.subjectAdsorption
dc.subjectComposite
dc.subjectFilm
dc.subjectStability
dc.titleHybrid silica-organic material with immobilized amino groups: surface probing and use for electrochemical determination of nitrite ions
dc.typeArtículos de revistas


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