کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9674226 | 1453200 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Uptake properties of Ni2+ by nCaO·Al2O3·2SiO2 (n = 1-4) prepared from solid-state reaction of kaolinite and calcite
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
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·Al2O3·2SiO2 showed the highest Ni2+ 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 Ca2+ 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 123, Issues 1â3, 31 August 2005, Pages 281-287
Journal: Journal of Hazardous Materials - Volume 123, Issues 1â3, 31 August 2005, Pages 281-287
نویسندگان
Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada, Kenneth J.D. MacKenzie,