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Temperature effect on phosphate sorption by iron hydroxide.

Authors
  • Mustafa, S
  • Nawab, G
  • Naeem, A
  • Rehana, N
  • Dilara, B
Type
Published Article
Journal
Environmental technology
Publication Date
Jan 01, 2004
Volume
25
Issue
1
Pages
1–6
Identifiers
PMID: 15027644
Source
Medline
License
Unknown

Abstract

The ion exchange sorption of phosphate on Fe(OH)3 is studied as a function of temperature (25-55 degrees C) and concentration (1.49-3.23 mmol l(-1)). The mechanism of sorption is observed to be the exchange of OH- anions from the adsorbent surface by those of H2PO4- and HPO4(2-) from the aqueous solution. An equation developed in the Langmuir formalism is used to explain the ion exchange sorption of phosphate on Fe(OH)3. The isosteric heat of sorption illustrates that the uptake of phosphate on Fe(OH)3 takes place through an anion exchange process, involving both the phosphate anions H2PO4- and HPO4(2-). Further, at higher temperature the solid prefers the HPO4(2-) anions forming a binuclear bridging complex.

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