Indirect radiotracer study of the adsorption of chromate ions on γ-Al2O3 and direct study of the adsorption of sulfate ions on Cr2O3 using 35S-labelled H2SO4

G. Horányi, L. Gáncs

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7 Citations (Scopus)

Abstract

The specific adsorption of sulfate ions on Cr2O3 was studied by a radiotracer technique using 35Slabelled sulfuric acid in low concentrations (c <10-3 mol dm-3) in the presence of a large excess of perchlorate supporting electrolyte. The pH and concentration dependence were determined. It was found that the extent of adsorption is determined by the protonation of the surface sites, similar to other oxides studied previously. A comparison of Cr2O3 and Al2O3 in this respect shows that the protonation of the former takes place at significantly lower pH values than that of the latter. The indirect radiotracer study of the adsorption of chromate on Al2O3 was carried out using labelled sulfate ions as indicator species. The results obtained show that the adsorption strength of chromate species is very low in comparison to sulfate ions and a regular Langmuir-like adsorption behaviour can be observed. It is believed that the observations presented may contribute to a better understanding of the behaviour of surface layers with a mixed oxide content.

Original languageEnglish
Pages (from-to)485-489
Number of pages5
JournalJournal of Solid State Electrochemistry
Volume6
Issue number7
DOIs
Publication statusPublished - Sep 2002

Fingerprint

Chromates
chromates
Sulfates
sulfates
Ions
Adsorption
adsorption
Protonation
ions
Oxides
mixed oxides
sulfuric acid
perchlorates
Sulfuric acid
Electrolytes
low concentrations
surface layers
electrolytes
oxides

Keywords

  • Aluminum oxide
  • Chromate ions
  • Chromium oxide
  • Radiotracer technique
  • Sulfate ions

ASJC Scopus subject areas

  • Electrochemistry

Cite this

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title = "Indirect radiotracer study of the adsorption of chromate ions on γ-Al2O3 and direct study of the adsorption of sulfate ions on Cr2O3 using 35S-labelled H2SO4",
abstract = "The specific adsorption of sulfate ions on Cr2O3 was studied by a radiotracer technique using 35Slabelled sulfuric acid in low concentrations (c <10-3 mol dm-3) in the presence of a large excess of perchlorate supporting electrolyte. The pH and concentration dependence were determined. It was found that the extent of adsorption is determined by the protonation of the surface sites, similar to other oxides studied previously. A comparison of Cr2O3 and Al2O3 in this respect shows that the protonation of the former takes place at significantly lower pH values than that of the latter. The indirect radiotracer study of the adsorption of chromate on Al2O3 was carried out using labelled sulfate ions as indicator species. The results obtained show that the adsorption strength of chromate species is very low in comparison to sulfate ions and a regular Langmuir-like adsorption behaviour can be observed. It is believed that the observations presented may contribute to a better understanding of the behaviour of surface layers with a mixed oxide content.",
keywords = "Aluminum oxide, Chromate ions, Chromium oxide, Radiotracer technique, Sulfate ions",
author = "G. Hor{\'a}nyi and L. G{\'a}ncs",
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AU - Horányi, G.

AU - Gáncs, L.

PY - 2002/9

Y1 - 2002/9

N2 - The specific adsorption of sulfate ions on Cr2O3 was studied by a radiotracer technique using 35Slabelled sulfuric acid in low concentrations (c <10-3 mol dm-3) in the presence of a large excess of perchlorate supporting electrolyte. The pH and concentration dependence were determined. It was found that the extent of adsorption is determined by the protonation of the surface sites, similar to other oxides studied previously. A comparison of Cr2O3 and Al2O3 in this respect shows that the protonation of the former takes place at significantly lower pH values than that of the latter. The indirect radiotracer study of the adsorption of chromate on Al2O3 was carried out using labelled sulfate ions as indicator species. The results obtained show that the adsorption strength of chromate species is very low in comparison to sulfate ions and a regular Langmuir-like adsorption behaviour can be observed. It is believed that the observations presented may contribute to a better understanding of the behaviour of surface layers with a mixed oxide content.

AB - The specific adsorption of sulfate ions on Cr2O3 was studied by a radiotracer technique using 35Slabelled sulfuric acid in low concentrations (c <10-3 mol dm-3) in the presence of a large excess of perchlorate supporting electrolyte. The pH and concentration dependence were determined. It was found that the extent of adsorption is determined by the protonation of the surface sites, similar to other oxides studied previously. A comparison of Cr2O3 and Al2O3 in this respect shows that the protonation of the former takes place at significantly lower pH values than that of the latter. The indirect radiotracer study of the adsorption of chromate on Al2O3 was carried out using labelled sulfate ions as indicator species. The results obtained show that the adsorption strength of chromate species is very low in comparison to sulfate ions and a regular Langmuir-like adsorption behaviour can be observed. It is believed that the observations presented may contribute to a better understanding of the behaviour of surface layers with a mixed oxide content.

KW - Aluminum oxide

KW - Chromate ions

KW - Chromium oxide

KW - Radiotracer technique

KW - Sulfate ions

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