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Uptake properties of Ni^2^+ by nCaO.Al"2O"3.2SiO"2 (n=1-4) prepared from solid-state reaction of kaolinite and calcite [An article from: Journal of Hazardous Materials]
Description
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Description:
A series of nCaO.Al"2O"3.2SiO"2 samples (n=1-4) were prepared by solid-state reaction of mechanochemically treated mixtures of kaolinite and calcite fired at 600-1000^oC for 24h. All the samples were X-ray amorphous after firing at 600-800^oC but had crystallized by 900^oC. The main crystalline phases were anorthite (n=1), gehlenite (n=2 and 3) and larnite (n=4). The uptake of Ni^2^+ by nCaO.Al"2O"3.2SiO"2 samples fired at 800 and 900^oC was investigated at room temperature using solutions with initial Ni^2^+ concentrations of 0.1-50mmol/l. Amorphous samples (fired at 800^oC) showed a higher Ni^2^+ uptake capacity than crystalline samples (fired at 900^oC). Ni^2^+ uptake was found to increase with increasing of CaO content. Amorphous 4CaO.Al"2O"3.2SiO"2 showed the highest Ni^2^+ uptake capacity (about 9mmol/g). The Ni^2^+ uptake abilities of the present samples are higher than those of other materials reported in the literature. Since the sorbed Ni^2^+/released Ca^2^+ ratios of these samples are close to unity, ion replacement of Ni^2^+ for Ca^2^+ is thought to be the principal mechanism of Ni^2^+ uptake by the present samples.
Description:
A series of nCaO.Al"2O"3.2SiO"2 samples (n=1-4) were prepared by solid-state reaction of mechanochemically treated mixtures of kaolinite and calcite fired at 600-1000^oC for 24h. All the samples were X-ray amorphous after firing at 600-800^oC but had crystallized by 900^oC. The main crystalline phases were anorthite (n=1), gehlenite (n=2 and 3) and larnite (n=4). The uptake of Ni^2^+ by nCaO.Al"2O"3.2SiO"2 samples fired at 800 and 900^oC was investigated at room temperature using solutions with initial Ni^2^+ concentrations of 0.1-50mmol/l. Amorphous samples (fired at 800^oC) showed a higher Ni^2^+ uptake capacity than crystalline samples (fired at 900^oC). Ni^2^+ uptake was found to increase with increasing of CaO content. Amorphous 4CaO.Al"2O"3.2SiO"2 showed the highest Ni^2^+ uptake capacity (about 9mmol/g). The Ni^2^+ uptake abilities of the present samples are higher than those of other materials reported in the literature. Since the sorbed Ni^2^+/released Ca^2^+ ratios of these samples are close to unity, ion replacement of Ni^2^+ for Ca^2^+ is thought to be the principal mechanism of Ni^2^+ uptake by the present samples.
