کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
584799 877898 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Equilibrium, kinetic and thermodynamic studies of adsorption of fluoride onto plaster of Paris
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Equilibrium, kinetic and thermodynamic studies of adsorption of fluoride onto plaster of Paris
چکیده انگلیسی
Batch sorption system using plaster of Paris as an adsorbent was investigated to remove fluoride ions from aqueous solutions. The system variables studied include initial concentration of the sorbate, agitation time, adsorbent dose, pH, co-ions and temperature. The experimental data fitted well to the Freundlich and Langmuir isotherms. Thermodynamic parameters such as ΔH°, ΔS° and ΔG° were calculated indicating that the adsorption was a spontaneous and exothermic. Kinetic studies reveal that the adsorption is first order. A mechanism involving three stages (external surface adsorption, intraparticle diffusion and final equilibrium) has been proposed for the adsorption of F− onto plaster of Paris. XRD patterns of the adsorbent were recorded to get a better in sight into the mechanism of adsorption process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 141, Issue 1, 6 March 2007, Pages 98-105
نویسندگان
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