TY - JOUR
T1 - Uptake properties of Ni2+ by nCaO·Al2O 3·2SiO2 (n = 1-4) prepared from solid-state reaction of kaolinite and calcite
AU - Jha, Vinay Kumar
AU - Kameshima, Yoshikazu
AU - Nakajima, Akira
AU - Okada, Kiyoshi
AU - MacKenzie, Kenneth J.D.
N1 - Funding Information:
Jha thanks Ministry of Education, Culture, Sports, Science and Technology, Japan, for the award of a graduate fellowship (Monbukagakusho Scholarship) under which the present study was carried out. A part of this study was supported by The Steel Industrial Foundation for the Advancement of Environmental Protection Technology. The authors thank Dr. K. Kiguchi of Tokyo Institute of Technology for help of the ICP-OES measurements.
PY - 2005/8/31
Y1 - 2005/8/31
N2 - 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.
AB - 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.
KW - CaO-AlO-SiO system
KW - Calcite
KW - Kaolinite
KW - Mechanochemical treatment
KW - Ni uptake
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U2 - 10.1016/j.jhazmat.2005.04.023
DO - 10.1016/j.jhazmat.2005.04.023
M3 - Article
C2 - 15936874
AN - SCOPUS:21344453578
VL - 123
SP - 281
EP - 287
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
IS - 1-3
ER -