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Temperature effect on phosphate sorption by iron hydroxide.

S Mustafa1, G Nawab, A Naeem

  • 1National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan.

Environmental Technology
|March 19, 2004
PubMed
Summary
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Phosphate sorption on iron(III) hydroxide involves anion exchange, where phosphate ions replace hydroxide ions. Higher temperatures favor the uptake of dibasic phosphate anions, forming a binuclear complex.

Area of Science:

  • Environmental Chemistry
  • Surface Chemistry
  • Materials Science

Background:

  • Phosphate contamination in water bodies is a significant environmental concern.
  • Iron(III) hydroxide (Fe(OH)3) is a common adsorbent used for removing pollutants.
  • Understanding the mechanism of phosphate sorption on Fe(OH)3 is crucial for optimizing water treatment processes.

Purpose of the Study:

  • To investigate the ion exchange sorption mechanism of phosphate on Fe(OH)3.
  • To determine the influence of temperature and concentration on phosphate sorption.
  • To elucidate the specific phosphate species involved in the sorption process.

Main Methods:

  • Batch sorption experiments were conducted at varying temperatures (25-55 °C) and phosphate concentrations (1.49-3.23 mmol L⁻¹).

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  • Langmuir formalism was applied to model the sorption data.
  • Isosteric heat of sorption was calculated to understand the thermodynamics of the process.

    • Main Results:

    • The sorption mechanism was identified as an anion exchange process, with phosphate ions (H2PO4⁻ and HPO4²⁻) replacing surface hydroxyl (OH⁻) groups.
    • Sorption data fitted well with the Langmuir equation, indicating monolayer adsorption.
    • Isosteric heat of sorption confirmed the anion exchange mechanism and revealed a preference for HPO4²⁻ at higher temperatures, leading to binuclear complex formation.

    Conclusions:

    • Fe(OH)3 effectively removes phosphate through an anion exchange mechanism.
    • Temperature plays a critical role in the speciation of sorbed phosphate, favoring HPO4²⁻ at elevated temperatures.
    • The findings provide valuable insights for designing efficient phosphate removal systems using Fe(OH)3.