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1
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The effect of pH on the sorption of copper ions by alginates

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Kwiatkowska-Marks S., Miłek J., Wójcik M.
Polish Journal of Chemical Technology
|
2008
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vol. 10
|
issue 1
28-30
EN
The effect of pH on copper ions sorption by alginates has been investigated. The granules of the sorbent obtained from sodium alginate (type DMF, manufactured by KELCO) have been applied. By using a new method of gelation a biosorbent containing from 11.3 to 20.3% mas. of alginate has been produced. Investigations have been carried out at a constant temperature of 25°C and the pH values ranging from 3 to 5. The obtained experimental results have been described by the Langmuir equation. It has been found that with the increasing pH of the solution the maximum biosorbent sorption capacity increased.
2
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An alternative method to determine the diffusion coefficient for the shrinking core model

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Kwiatkowska-Marks S., Wójcik M., Kopiński L.
Polish Journal of Chemical Technology
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2011
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vol. 13
|
issue 2
54-56
EN
A new method to determine the effective diffusion coefficient of sorbate in sorbent granule based on the analytical solution of the shrinking core model (SCM) has been proposed. The experimental data presented by Lewandowski and Roe1 concerning the sorption of copper ions by alginate granules have been applied to compare the analytical and numerical methods. The results obtained by both methods are very close.
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