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Interaction of Cr3+ with Silica Gel at the Aqueous Interface Using Fluorescence in Sodium Dodecyl Sulfate Micelles and Confocal Fluorescence Microscopy

Idrees, Muhammad ; Silva, Marcelo ; Silva, Alessandra F ; Zimmermann, Lizandra M ; Bruch, Jociane ; Mendonça, Caio O ; Almerindo, Gizelle I ; Nome, Rene A ; Atvars, Teresa D. Z ; Fiedler, Haidi D ; Nome, Faruk

Journal of physical chemistry. C, 2012-02, Vol.116 (5), p.3517-3523 [Revista revisada por pares]

Columbus, OH: American Chemical Society

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Interaction of Cr3+ with Silica Gel at the Aqueous Interface Using Fluorescence in Sodium Dodecyl Sulfate Micelles and Confocal Fluorescence Microscopy
Autor: Idrees, Muhammad ; Silva, Marcelo ; Silva, Alessandra F ; Zimmermann, Lizandra M ; Bruch, Jociane ; Mendonça, Caio O ; Almerindo, Gizelle I ; Nome, Rene A ; Atvars, Teresa D. Z ; Fiedler, Haidi D ; Nome, Faruk
Materias: Composition and phase identification ; Condensed matter: structure, mechanical and thermal properties ; Exact sciences and technology ; Physics ; Solid surfaces and solid-solid interfaces ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) ; Thin film structure and morphology
Es parte de: Journal of physical chemistry. C, 2012-02, Vol.116 (5), p.3517-3523
Descripción: Chemical composition and species distribution in clay surfaces are key factors which control sorption and desorption processes of Cr3+ between sediment and water. Adsorption of Cr3+ on silica gel has been studied by following the quenching of naphthalene fluorescence in aqueous sodium dodecyl sulfate (SDS) micelles, which concentrate naphthalene and Cr3+ in the micellar surface. Adsorption for pH ≤ 5 follows a Langmuir model, and experimental data fitting is successfully described by a model based on discrete sites on the surface with variable charge as a function of pH. Probably the mechanism of Cr3+ adsorption at the silica gel surface is predominantly electrostatic, with outer-sphere complexation and ion exchange with adsorbed H+ ions. Confocal laser-scanning fluorescence microscopy measurements reveal the Cr3+ spatial distribution in three dimensions. Specifically, both images and spectra measured with confocal microscopy indicate that Cr3+ is distributed across the entire particle, not just adsorption at the surface.
Editor: Columbus, OH: American Chemical Society
Idioma: Inglés

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Interaction of Cr3+ with Silica Gel at the Aqueous Interface Using Fluorescence in Sodium Dodecyl Sulfate Micelles and Confocal Fluorescence Microscopy

Idrees, Muhammad ; Silva, Marcelo ; Silva, Alessandra F ; Zimmermann, Lizandra M ; Bruch, Jociane ; Mendonça, Caio O ; Almerindo, Gizelle I ; Nome, Rene A ; Atvars, Teresa D. Z ; Fiedler, Haidi D ; Nome, Faruk

Columbus, OH: American Chemical Society

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