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Journal of Environmental Science and Technology

Year: 2011 | Volume: 4 | Issue: 5 | Page No.: 520-533
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Authors

A.B. Dekhil

Y. Hannachi

A. Ghorbel

T. Boubaker

Keywords

Research Article

Comparative Study of the Removal of Cadmium from Aqueous Solution by using Low-cost Adsorbents

A.B. Dekhil, Y. Hannachi, A. Ghorbel and T. Boubaker
The removal of Cd (II) from aqueous solution by different adsorbents was investigated. Grafted cellulosic fabrics with itaconic acid, green alga (Caulerpa racemosa), clarified sludge (a steel industry waste material), were used for the adsorption studies. The influence of pH, contact time, initial metal concentration, adsorbent nature and concentration on the selectivity and sensitivity of the removal process was investigated. The adsorption process was found to follow a first-order rate mechanism and rate constant was evaluated at 30°C. Langmuir and Freundlich adsorption isotherms fit well in the experimental data and their constants were evaluated. The thermodynamic studies showed that the adsorption was spontaneous and exothermic in nature. Results of the study showed that locally available materials such as green macroalga (Caulerpa racemosa), clarified sludge and grafted cellulosic fabrics can be used as efficient sorbents for cadmium ions removal, representing an effective and environmentally clean utilization of waste matter.
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