Removal of Cr(VI) and Pb(II)

from aqueous solution by activated sawdust

 

K. Elmerzouki1*, A. Khalidi1, R. Abdelhedi2, I. Bimaghra3, P. Taxil4, B. Lafage4, A. Savall4

1 Laboratoire d’Electrochimie et de Chimie Physique, Faculté des Sciences et Techniques Mohammedia,

B..P 146 - Avenue Hassan II - 20650 Mohammedia, Morocco.

2 Laboratoire d’Electrochimie et d’Environnement, Ecole Nationale d’Ingénieurs de Sfax, BPW, 3038 Sfax, Tunisia.

3 Ecole Normale Supérieure Route d’El-Jadida, Km 7, Casablanca, Morocco.

4 Université de Toulouse, CNRS, Laboratoire de Génie Chimique, F-31062 Toulouse, cedex 09, France.

* Corresponding author. E-mail: elmer_khad@yahoo.fr

Received: 14 February 2012; revised version accepted: 28 March 2012

 

Abstract

    Developing countries are the more exposed to pollution problems. To combat this, they must develop policies for the integrated management of the environment (water management, water and air treatment, treatment of industrial effluents etc.). As a consequence, different methods of treatment must be used to reduce these problems. This work was aimed to evaluate the feasibility of the fixation of heavy metals such as chromium (VI) and lead (II) by using activated carbon (AC) prepared from inexpensive precursor (white wood sawdust) by chemical and thermal activation. Adsorption efficiency depends on several parameters such as initial solution pH, contact time, initial metal ion concentration and mass of AC. Adsorption kinetics data were tested using pseudo-first-order and pseudo-second-order chemisorption models, and the best one was chosen according to the comparison of their correlation coefficient results. The analyse the experimental data of the isotherms reveal that the adsorption process for the two heavy metal ions Pb(II) and Cr(VI) follows respectively the Temkin and Freundlich equations.

 

Keywords: Activated carbon; Adsorption; Cr(VI); Pb(II); Isotherms; Kinetics.

 


 

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