کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9451903 | 1307848 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sorption of cadmium, copper, and zinc ions onto bone char using Crank diffusion model
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
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چکیده انگلیسی
The rates of adsorption of cadmium, copper and zinc ions onto bone char have been studied in three single component systems using an agitated batch adsorber. The effects of initial metal ion solution concentration and bone char mass have been studied. The capacities of the three metals on bone char are 0.477, 0.709 and 0.505 mmol gâ1 for cadmium, copper and zinc respectively which are much higher than most other adsorbents reported in the literature for these three metals. In order to model the experimental concentration decay curves, a film-surface diffusion equation proposed by Crank (1979) has been solved. The model results correlate the experimental better than a previously applied film-pore diffusion model. However, the results indicate that the surface diffusion coefficient was a variable function of initial metal ion concentration. The surface diffusivities vary from 3.00 Ã 10â9 to 8.80 Ã 10â9 cm2 sâ1, 2.11 Ã 10â9 cm2 sâ1 to 5.4 Ã 10â9 cm2 sâ1 and 3.10 Ã 10â9 to 8.49 Ã 10â9 cm2 sâ1 for cadmium, copper and zinc respectively, for metal ion solution concentrations of 2.10-5.40 mmol dmâ3.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 60, Issue 8, August 2005, Pages 1141-1150
Journal: Chemosphere - Volume 60, Issue 8, August 2005, Pages 1141-1150
نویسندگان
Keith K.H. Choy, Gordon McKay,