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Adsorption of 60Co on natural and dithizone-modified chitin

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Abstract

Immobilization of dithizone onto natural biopolymer chitin to enhance the ability of chitin to adsorb 60Co was performed. Natural and dithizone-modified chitin was characterized using surface area analyzer and infrared spectroscopy. The sorption was studied in relation to the contact time, pH, initial 60Co concentration, and adsorbent dosage. Batch adsorption models based on the assumption of the pseudo-first-order, pseudosecondorder, and intraparticle models were applied to examine the adsorption kinetics. The results showed that kinetic data followed closely the pseudo-first-order model. The Freundlich, Langmuir, and Redlich-Peterson isotherms were used for the mathematical description of the adsorption equilibrium, and the best fitting was attained using the Freundlich model. Sorption studies were also performed at different temperatures to obtain the thermodynamic parameters of the process. The quantity ΔG 0 decreases with an increase in temperature, indicating that the sorption is more favorable at higher temperatures. The positive value of ΔH 0 indicates that the sorption is endothermic.

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Authors and Affiliations

  1. Radiation Protection Department, Nuclear Research Centre, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt

    H. A. Omar

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  1. H. A. Omar
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Correspondence to H. A. Omar.

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Published in Russian in Radiokhimiya, 2013, Vol. 55, No. 1, pp. 68–73.

The text was submitted by the author in English.

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Omar, H.A. Adsorption of 60Co on natural and dithizone-modified chitin. Radiochemistry 55, 101–107 (2013). https://doi.org/10.1134/S1066362213010207

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  • DOI: https://doi.org/10.1134/S1066362213010207

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