TY - JOUR
T1 - Simultaneous uptake of ammonium and phosphate ions by composites of γ-alumina/potassium aluminosilicate gel
AU - Okada, Kiyoshi
AU - Temuujin, Jadambaa
AU - Kameshima, Yoshikazu
AU - MacKenzie, Kenneth J.D.
N1 - Funding Information:
JT thanks Japan Society for the Promotion of Sciences for the award of a Research Fellowship under which present research was carried out.
PY - 2003/4/30
Y1 - 2003/4/30
N2 - 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.
AB - 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.
KW - A. Ceramics
KW - A. Composites
KW - B. Chemical synthesis
KW - D. Surface properties
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U2 - 10.1016/S0025-5408(03)00064-3
DO - 10.1016/S0025-5408(03)00064-3
M3 - Article
AN - SCOPUS:0038558419
SN - 0025-5408
VL - 38
SP - 749
EP - 756
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 5
ER -