Uptake properties of Ni2+ by nCaO·Al2O 3·2SiO2 (n = 1-4) prepared from solid-state reaction of kaolinite and calcite

Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada, Kenneth J D MacKenzie

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A series of nCaO·Al2O3·2SiO2 samples (n = 1-4) were prepared by solid-state reaction of mechanochemically treated mixtures of kaolinite and calcite fired at 600-1000°C for 24 h. All the samples were X-ray amorphous after firing at 600-800°C but had crystallized by 900°C. The main crystalline phases were anorthite (n = 1), gehlenite (n = 2 and 3) and larnite (n = 4). The uptake of Ni2+ by nCaO·Al2O3·2SiO2 samples fired at 800 and 900°C was investigated at room temperature using solutions with initial Ni2+ concentrations of 0.1-50 mmol/l. Amorphous samples (fired at 800°C) showed a higher Ni2+ uptake capacity than crystalline samples (fired at 900°C). Ni2+ uptake was found to increase with increasing of CaO content. Amorphous 4CaO·Al 2O3·2SiO2 showed the highest Ni 2+ uptake capacity (about 9 mmol/g). The Ni2+ uptake abilities of the present samples are higher than those of other materials reported in the literature. Since the sorbed Ni2+/released Ca 2+ ratios of these samples are close to unity, ion replacement of Ni2+ for Ca2+ is thought to be the principal mechanism of Ni2+ uptake by the present samples.

Original languageEnglish
Pages (from-to)281-287
Number of pages7
JournalJournal of Hazardous Materials
Volume123
Issue number1-3
DOIs
Publication statusPublished - Aug 31 2005
Externally publishedYes

Fingerprint

Kaolin
anorthite
Calcium Carbonate
Kaolinite
Calcite
Solid state reactions
kaolinite
calcite
replacement
X-Rays
Ions
Temperature
ion
Crystalline materials
temperature
X rays
firing
solid state
material

Keywords

  • Calcite
  • CaO-AlO-SiO system
  • Kaolinite
  • Mechanochemical treatment
  • Ni uptake

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

Cite this

Uptake properties of Ni2+ by nCaO·Al2O 3·2SiO2 (n = 1-4) prepared from solid-state reaction of kaolinite and calcite. / Jha, Vinay Kumar; Kameshima, Yoshikazu; Nakajima, Akira; Okada, Kiyoshi; MacKenzie, Kenneth J D.

In: Journal of Hazardous Materials, Vol. 123, No. 1-3, 31.08.2005, p. 281-287.

Research output: Contribution to journalArticle

Jha, Vinay Kumar ; Kameshima, Yoshikazu ; Nakajima, Akira ; Okada, Kiyoshi ; MacKenzie, Kenneth J D. / Uptake properties of Ni2+ by nCaO·Al2O 3·2SiO2 (n = 1-4) prepared from solid-state reaction of kaolinite and calcite. In: Journal of Hazardous Materials. 2005 ; Vol. 123, No. 1-3. pp. 281-287.
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