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Advances in Physical Chemistry
Volume 2013 (2013), Article ID 159712, 9 pages
Research Article

Comparative Biosorption Studies of Hexavalent Chromium Ion onto Raw and Modified Palm Branches

Surface Chemistry and Catalysis Laboratory, National Research Centre, El-Dokki, Cairo 12622, Egypt

Received 29 March 2013; Revised 20 May 2013; Accepted 9 June 2013

Academic Editor: Marc Koper

Copyright © 2013 Mona A. Shouman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The waste of palm branches (PB) was tested for its ability to remove chromium (VI) from aqueous solution by batch and column experiments. Palm branches chemically modified with an oxidizing agent (sulphuric acid) then coated with chitosan and surfactant (hexadecyl trimethyl ammonium bromide surfactant, HDTMA), respectively, were carried out to improve the removal performance of PB. The results of their Cr (VI) removal performances are pH dependent. The adsorption data could be well interpreted by the Langmuir, Freundlich, and Flory-Huggins isotherm models. The maximum adsorption capacity obtained from the Langmuir model for the chitosan coated oxidized palm branches is 55 mg/mg. The adsorption process could be described by pseudo-second-order kinetic model. The intraparticle diffusion study revealed that film diffusion might be involved. The biosorbents were successfully regenerated using 1 M HCL solution.