pH dependence of Phosphate sorption on aluminum

Z. Németh, L. Gáncs, G. Gémes, A. Kolics

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The sorption of phosphate ions on aluminum was studied by an in situ radiotracer technique. The kinetics and reversibility of sorption and the influence of the solution pH on phosphate coverage were followed in 0.1 mol dm-3 NaCl solution. It was found that phosphate adsorption on aluminum is determined by the surface charge and the protonation state of phosphate in the bulk solution. Despite the high chloride concentration, significant phosphate sorption was identified, indicating strong phosphate binding to the surface. Phosphate sorption increased with pH up to pH = 4.7. As the pH of the solution increased further, phosphate desorbed from aluminum. The exchange experiments indicated that the phosphate sorption on the passive aluminum surface is a largely irreversible process. It is assumed that, in near neutral solution, there is an ongoing surface transformation, i.e., oxide film growth, that entraps phosphate ions from the solution.

Original languageEnglish
Pages (from-to)2023-2027
Number of pages5
JournalCorrosion Science
Volume40
Issue number12
DOIs
Publication statusPublished - Dec 1998

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Aluminum
Sorption
Phosphates
Ions
Protonation
Film growth
Surface charge
Oxide films
Chlorides
Adsorption
Kinetics

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

pH dependence of Phosphate sorption on aluminum. / Németh, Z.; Gáncs, L.; Gémes, G.; Kolics, A.

In: Corrosion Science, Vol. 40, No. 12, 12.1998, p. 2023-2027.

Research output: Contribution to journalArticle

Németh, Z. ; Gáncs, L. ; Gémes, G. ; Kolics, A. / pH dependence of Phosphate sorption on aluminum. In: Corrosion Science. 1998 ; Vol. 40, No. 12. pp. 2023-2027.
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