Simultaneous uptake of ammonium and phosphate ions by composites of γ-alumina/potassium aluminosilicate gel

Kiyoshi Okada, Jadambaa Temuujin, Yoshikazu Kameshima, Kenneth J.D. MacKenzie

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The simultaneous uptake of ammonium and phosphate ions from solution by composites of γ-alumina/potassium aluminosilicate (KAS) gel has been investigated. The composites were prepared by selective leaching of calcined kaolinite (Al2Si2O5(OH)4) using KOH solution, followed by neutralization of the leachate at pH 5.5 with nitric acid. The composites were reacted with solutions containing various concentrations of (NH4)2HPO4 at pH 5, 7 and 10 at room temperature for 24 h to examine their uptake of ammonium and phosphate ions. Simultaneous uptake of ammonium and phosphate ions was found, the uptake of ammonium ions being greater than for phosphate ions, especially at pH = 7. This observation is considered to result mainly from the porous properties of the composites, which should therefore be controlled to enhance the simultaneous uptake of both ions, especially phosphate ion.

Original languageEnglish
Pages (from-to)749-756
Number of pages8
JournalMaterials Research Bulletin
Volume38
Issue number5
DOIs
Publication statusPublished - Apr 30 2003
Externally publishedYes

Keywords

  • A. Ceramics
  • A. Composites
  • B. Chemical synthesis
  • D. Surface properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Simultaneous uptake of ammonium and phosphate ions by composites of γ-alumina/potassium aluminosilicate gel'. Together they form a unique fingerprint.

  • Cite this