Some peculiarities in the specific adsorption of phosphate ions on hematite and γ-Al2O3 as reflected by radiotracer studies

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Abstract

The specific adsorption of radiolabeled phosphate ions from perchlorate supporting electrolyte onto γ-Al2O3 and hematite powder has been investigated. The pH dependence of the adsorption of phosphate species was compared with that of sulfate ions. It was demonstrated that in contrast to the behavior of sulfate ions the pH dependence of phosphate ions goes through a maximum. On the other hand, it was found that the reversible adsorption of phosphate ions is accompanied by the formation of strongly chemisorbed species. Results obtained from a study of the competitive adsorption of sulfate and phosphate ions at various pH values are reported and interpreted. An attempt is made to correlate the experimental findings with the models for anion adsorption reported in the literature.

Original languageEnglish
Pages (from-to)12-17
Number of pages6
JournalJournal of Colloid and Interface Science
Volume247
Issue number1
DOIs
Publication statusPublished - 2002

Fingerprint

Hematite
hematite
phosphates
Phosphates
Ions
Adsorption
adsorption
Sulfates
sulfates
ions
Powders
Electrolytes
Anions
perchlorates
ferric oxide
Negative ions
electrolytes
anions

Keywords

  • γ-AlO
  • Hematite
  • Phosphate
  • Radiotracer technique
  • Specific adsorption

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

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abstract = "The specific adsorption of radiolabeled phosphate ions from perchlorate supporting electrolyte onto γ-Al2O3 and hematite powder has been investigated. The pH dependence of the adsorption of phosphate species was compared with that of sulfate ions. It was demonstrated that in contrast to the behavior of sulfate ions the pH dependence of phosphate ions goes through a maximum. On the other hand, it was found that the reversible adsorption of phosphate ions is accompanied by the formation of strongly chemisorbed species. Results obtained from a study of the competitive adsorption of sulfate and phosphate ions at various pH values are reported and interpreted. An attempt is made to correlate the experimental findings with the models for anion adsorption reported in the literature.",
keywords = "γ-AlO, Hematite, Phosphate, Radiotracer technique, Specific adsorption",
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T1 - Some peculiarities in the specific adsorption of phosphate ions on hematite and γ-Al2O3 as reflected by radiotracer studies

AU - Horányi, G.

AU - Joó, P.

PY - 2002

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N2 - The specific adsorption of radiolabeled phosphate ions from perchlorate supporting electrolyte onto γ-Al2O3 and hematite powder has been investigated. The pH dependence of the adsorption of phosphate species was compared with that of sulfate ions. It was demonstrated that in contrast to the behavior of sulfate ions the pH dependence of phosphate ions goes through a maximum. On the other hand, it was found that the reversible adsorption of phosphate ions is accompanied by the formation of strongly chemisorbed species. Results obtained from a study of the competitive adsorption of sulfate and phosphate ions at various pH values are reported and interpreted. An attempt is made to correlate the experimental findings with the models for anion adsorption reported in the literature.

AB - The specific adsorption of radiolabeled phosphate ions from perchlorate supporting electrolyte onto γ-Al2O3 and hematite powder has been investigated. The pH dependence of the adsorption of phosphate species was compared with that of sulfate ions. It was demonstrated that in contrast to the behavior of sulfate ions the pH dependence of phosphate ions goes through a maximum. On the other hand, it was found that the reversible adsorption of phosphate ions is accompanied by the formation of strongly chemisorbed species. Results obtained from a study of the competitive adsorption of sulfate and phosphate ions at various pH values are reported and interpreted. An attempt is made to correlate the experimental findings with the models for anion adsorption reported in the literature.

KW - γ-AlO

KW - Hematite

KW - Phosphate

KW - Radiotracer technique

KW - Specific adsorption

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