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Title: The Co{sup 2+} adsorption properties of Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, TiO{sub 2}, and MnO{sub 2} evaluated by modeling with the Frumkin isotherm

Abstract

Adsorption of Co(II) ions on metal oxides is related to radioactive {sup 60}Co(II) (de)contamination of nuclear power plants, Co(II) ion retention in soils as a plant nutrient, concentration of Co(II) in deep-sea manganese nodules, and other applications. Here, the amount of adsorbed Co(II) on metal oxides was measured as a function of the pH and concentration of Co(II) ions, and the adsorption properties of metal oxides were evaluated with a model that considers simultaneous (1:1) and (1:2) exchange reactions between Co{sup 2+} aqua ions and surface hydroxyl protons obeying the Frumkin isotherm. The possibility of participation of mono- and polynuclear Co(II) hydroxo complexes in the absorption was examined, and it was suggested that these species play no role under the conditions here. From the model parameters, it was found that the Co{sup 2+} adsorption ability of metal oxides increases in the order Al{sub 2}O{sub 3} < Fe{sub 2}O{sub 3} < TiO{sub 2} < Fe{sub 3}O{sub 4} < MnO{sub 2}, showing a good correlation to the electronegativity X{sub i} of the lattice metal ions of the oxides. The Co{sup 2+} adsorption was divided into two processes: (1) deprotonation of surface hydroxyl sites and (2) bonding of Co{sup 2+} to the deprotonatedmore » sites with a negative charge. With increasing X{sub i}, process 1 increases possibly due to the decrease in the donor electron density responsible for covalent bonds with protons, while process 2 changes only slightly. It was suggested that process 2 is due to ionic bond formation (electrostatic contact adsorption), which is independent of the donor electron density, and the correlation of the overall process to X{sub i} found here was ascribed to process 1 above.« less

Authors:
;  [1];  [2]
  1. Hokkaido Univ., Sapporo (Japan)
  2. Asahikawa National College of Technology (Japan)
Publication Date:
OSTI Identifier:
596998
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 195; Journal Issue: 1; Other Information: PBD: 1 Nov 1997
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 05 NUCLEAR FUELS; COBALT; ADSORPTION; ALUMINIUM OXIDES; IRON OXIDES; TITANIUM OXIDES; SORPTIVE PROPERTIES; RADIOACTIVE WASTE PROCESSING; COBALT 60; ENVIRONMENTAL TRANSPORT; COOLANT CLEANUP SYSTEMS

Citation Formats

Tamura, Hiroki, Furuichi, Ryusaburo, and Katayama, Noriaki. The Co{sup 2+} adsorption properties of Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, TiO{sub 2}, and MnO{sub 2} evaluated by modeling with the Frumkin isotherm. United States: N. p., 1997. Web. doi:10.1006/jcis.1997.5148.
Tamura, Hiroki, Furuichi, Ryusaburo, & Katayama, Noriaki. The Co{sup 2+} adsorption properties of Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, TiO{sub 2}, and MnO{sub 2} evaluated by modeling with the Frumkin isotherm. United States. doi:10.1006/jcis.1997.5148.
Tamura, Hiroki, Furuichi, Ryusaburo, and Katayama, Noriaki. Sat . "The Co{sup 2+} adsorption properties of Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, TiO{sub 2}, and MnO{sub 2} evaluated by modeling with the Frumkin isotherm". United States. doi:10.1006/jcis.1997.5148.
@article{osti_596998,
title = {The Co{sup 2+} adsorption properties of Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, TiO{sub 2}, and MnO{sub 2} evaluated by modeling with the Frumkin isotherm},
author = {Tamura, Hiroki and Furuichi, Ryusaburo and Katayama, Noriaki},
abstractNote = {Adsorption of Co(II) ions on metal oxides is related to radioactive {sup 60}Co(II) (de)contamination of nuclear power plants, Co(II) ion retention in soils as a plant nutrient, concentration of Co(II) in deep-sea manganese nodules, and other applications. Here, the amount of adsorbed Co(II) on metal oxides was measured as a function of the pH and concentration of Co(II) ions, and the adsorption properties of metal oxides were evaluated with a model that considers simultaneous (1:1) and (1:2) exchange reactions between Co{sup 2+} aqua ions and surface hydroxyl protons obeying the Frumkin isotherm. The possibility of participation of mono- and polynuclear Co(II) hydroxo complexes in the absorption was examined, and it was suggested that these species play no role under the conditions here. From the model parameters, it was found that the Co{sup 2+} adsorption ability of metal oxides increases in the order Al{sub 2}O{sub 3} < Fe{sub 2}O{sub 3} < TiO{sub 2} < Fe{sub 3}O{sub 4} < MnO{sub 2}, showing a good correlation to the electronegativity X{sub i} of the lattice metal ions of the oxides. The Co{sup 2+} adsorption was divided into two processes: (1) deprotonation of surface hydroxyl sites and (2) bonding of Co{sup 2+} to the deprotonated sites with a negative charge. With increasing X{sub i}, process 1 increases possibly due to the decrease in the donor electron density responsible for covalent bonds with protons, while process 2 changes only slightly. It was suggested that process 2 is due to ionic bond formation (electrostatic contact adsorption), which is independent of the donor electron density, and the correlation of the overall process to X{sub i} found here was ascribed to process 1 above.},
doi = {10.1006/jcis.1997.5148},
journal = {Journal of Colloid and Interface Science},
number = 1,
volume = 195,
place = {United States},
year = {1997},
month = {11}
}