Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface

Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface

Silica-borax pearl samples impregnated with 0.17 and 0.64% Cr3+ were characterized by specific surface area measurements, UV-Vis spectroscopy, energy-dispersive X-ray fluorescence and laser-scanning confocal microscopy. Pearl stability against oxidizing conditions was tested by adding samples to an aqueous hydrogen peroxide solution. The reaction was examined by UV-Vis spectroscopic measurements of the supernatant and laser-scanning confocal microscopy images of the substrate. Overall, hydrogen peroxide-induced Cr3+ to Cr6+ oxidation across the solid-liquid interface promoted solid matrix cleavage pearl degradation and concomitant formation of multiple scattering centers was observed. A dual-detection scheme was employed in the confocal microscopy measurements allowing us to separate scattering and absorptive contributions to the observed signals. The confocal microscopy images indicate that Cr3+ oxidation induced by hydrogen peroxide solutions occurs throughout the entire pearl sample and indicate that oxidation reactions induce leakage of chromate ion into aqueous solutions.

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Main Authors: Almerindo,Gizelle I., Gaborim,Anika P. A., Nicolazi,Lucas M., Idrees,Muhammad, Nome,Faruk, Fiedler,Haidi D., Nome,Rene A.
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Química 2017
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000901708
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spelling oai:scielo:S0103-505320170009017082017-07-28Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid InterfaceAlmerindo,Gizelle I.Gaborim,Anika P. A.Nicolazi,Lucas M.Idrees,MuhammadNome,FarukFiedler,Haidi D.Nome,Rene A. confocal fluorescence microscopy chromium mobility H2O2 oxidation equilibria solid liquid interfaces mass transfer phenomena energy dispersive X-ray fluorescence Silica-borax pearl samples impregnated with 0.17 and 0.64% Cr3+ were characterized by specific surface area measurements, UV-Vis spectroscopy, energy-dispersive X-ray fluorescence and laser-scanning confocal microscopy. Pearl stability against oxidizing conditions was tested by adding samples to an aqueous hydrogen peroxide solution. The reaction was examined by UV-Vis spectroscopic measurements of the supernatant and laser-scanning confocal microscopy images of the substrate. Overall, hydrogen peroxide-induced Cr3+ to Cr6+ oxidation across the solid-liquid interface promoted solid matrix cleavage pearl degradation and concomitant formation of multiple scattering centers was observed. A dual-detection scheme was employed in the confocal microscopy measurements allowing us to separate scattering and absorptive contributions to the observed signals. The confocal microscopy images indicate that Cr3+ oxidation induced by hydrogen peroxide solutions occurs throughout the entire pearl sample and indicate that oxidation reactions induce leakage of chromate ion into aqueous solutions.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society v.28 n.9 20172017-09-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000901708en10.21577/0103-5053.20170015
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Almerindo,Gizelle I.
Gaborim,Anika P. A.
Nicolazi,Lucas M.
Idrees,Muhammad
Nome,Faruk
Fiedler,Haidi D.
Nome,Rene A.
spellingShingle Almerindo,Gizelle I.
Gaborim,Anika P. A.
Nicolazi,Lucas M.
Idrees,Muhammad
Nome,Faruk
Fiedler,Haidi D.
Nome,Rene A.
Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface
author_facet Almerindo,Gizelle I.
Gaborim,Anika P. A.
Nicolazi,Lucas M.
Idrees,Muhammad
Nome,Faruk
Fiedler,Haidi D.
Nome,Rene A.
author_sort Almerindo,Gizelle I.
title Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface
title_short Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface
title_full Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface
title_fullStr Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface
title_full_unstemmed Confocal Fluorescence Microscopy and Kinetics of the Cr 3+-Chromate Ion Oxidation Equilibria at the Solid Liquid Interface
title_sort confocal fluorescence microscopy and kinetics of the cr 3+-chromate ion oxidation equilibria at the solid liquid interface
description Silica-borax pearl samples impregnated with 0.17 and 0.64% Cr3+ were characterized by specific surface area measurements, UV-Vis spectroscopy, energy-dispersive X-ray fluorescence and laser-scanning confocal microscopy. Pearl stability against oxidizing conditions was tested by adding samples to an aqueous hydrogen peroxide solution. The reaction was examined by UV-Vis spectroscopic measurements of the supernatant and laser-scanning confocal microscopy images of the substrate. Overall, hydrogen peroxide-induced Cr3+ to Cr6+ oxidation across the solid-liquid interface promoted solid matrix cleavage pearl degradation and concomitant formation of multiple scattering centers was observed. A dual-detection scheme was employed in the confocal microscopy measurements allowing us to separate scattering and absorptive contributions to the observed signals. The confocal microscopy images indicate that Cr3+ oxidation induced by hydrogen peroxide solutions occurs throughout the entire pearl sample and indicate that oxidation reactions induce leakage of chromate ion into aqueous solutions.
publisher Sociedade Brasileira de Química
publishDate 2017
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000901708
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AT gaborimanikapa confocalfluorescencemicroscopyandkineticsofthecr3chromateionoxidationequilibriaatthesolidliquidinterface
AT nicolazilucasm confocalfluorescencemicroscopyandkineticsofthecr3chromateionoxidationequilibriaatthesolidliquidinterface
AT idreesmuhammad confocalfluorescencemicroscopyandkineticsofthecr3chromateionoxidationequilibriaatthesolidliquidinterface
AT nomefaruk confocalfluorescencemicroscopyandkineticsofthecr3chromateionoxidationequilibriaatthesolidliquidinterface
AT fiedlerhaidid confocalfluorescencemicroscopyandkineticsofthecr3chromateionoxidationequilibriaatthesolidliquidinterface
AT nomerenea confocalfluorescencemicroscopyandkineticsofthecr3chromateionoxidationequilibriaatthesolidliquidinterface
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