کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
580243 | 1453150 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
BTEX and MTBE adsorption onto raw and thermally modified diatomite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
The removal of BTEX (benzene, toluene, ethyl-benzene and xylenes) and MTBE (methyl tertiary butyl ether) from aqueous solution by raw (DR) and thermally modified diatomite at 550, 750 and 950 °C (D550, D750 and D950 respectively) was studied. Physical characteristics of both raw and modified diatomite such as specific surface, pore volume distribution, porosity and pHsolution were determined, indicating important structural changes in the modified diatomite, due to exposure to high temperatures. Both adsorption kinetic and isotherm experiments were carried out. The kinetics data proved a closer fit to the pseudo-second order model. Maximum values for the rate constant, k2, were obtained for MTBE and benzene (48.9326 and 18.0996 g mgâ1 hâ1, respectively) in sample D550. The isotherm data proved to fit the Freundlich model more closely, which produced values of the isotherm constant 1/n higher than one, indicating unfavorable adsorption. The highest adsorption capacity, calculated through the values of the isotherm constant kF, was obtained for MTBE (48.42 mg kgâ1 (mg/L)n) in sample D950.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 178, Issues 1â3, 15 June 2010, Pages 136-143
Journal: Journal of Hazardous Materials - Volume 178, Issues 1â3, 15 June 2010, Pages 136-143
نویسندگان
Maria Aivalioti, Ioannis Vamvasakis, Evangelos Gidarakos,