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Sorption of cadmium, copper, and zinc ions onto bone char using Crank diffusion model [An article from: Chemosphere]
Book Details
Author(s)K.K.H. Choy, G. McKay
PublisherElsevier
ISBN / ASINB000RR5GOG
ISBN-13978B000RR5GO7
MarketplaceFrance 🇫🇷
Description
This digital document is a journal article from Chemosphere, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
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 mmolg^-^1 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 3.00x10^-^9 to 8.80x10^-^9 cm^2s^-^1, 2.11x10^-^9 cm^2s^-^1 to 5.4x10^-^9 cm^2s^-^1 and 3.10x10^-^9 to 8.49x10^-^9 cm^2s^-^1 for cadmium, copper and zinc respectively, for metal ion solution concentrations of 2.10-5.40 mmoldm^-^3.
Description:
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 mmolg^-^1 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 3.00x10^-^9 to 8.80x10^-^9 cm^2s^-^1, 2.11x10^-^9 cm^2s^-^1 to 5.4x10^-^9 cm^2s^-^1 and 3.10x10^-^9 to 8.49x10^-^9 cm^2s^-^1 for cadmium, copper and zinc respectively, for metal ion solution concentrations of 2.10-5.40 mmoldm^-^3.
