Application of an Algerian clays in the retention of lead ions

Author(s): Fatima Zohra Choumane, Belkacem Benguella

The aim objective of this work is to study the adsorption of lead ion by an algerian claysminerals. Thesematerialswere characterized by x fluorescence, FTIR spectroscopy, surface area and cation exchange capacities CEC. The Adsorption tests were carried out by the batch technique at room temperature. The uptake of Pb(II) from aqueous solutions to the clays has been studied as function of contact time, temperature, pH and agitation speed which were regarded as a principal factors in the analysis of the adsorption process, the contact time for the maximumadsorptio required is 180m The adsorption kinetics is in better agreement with pseudo-second order kinetics. The results show that the uptake of Pb(II) increases with the pH increasing in the pH range of 2.0–12.0. The increase of the temperature influence negatively the adsorption, what shows the phenomenon of the physisorption of lead ion on the tested materials. The studies on the retention of lead ion showed that it is mainly influenced by the physico-chemical properties of used clays, results show that sorption of lead ion was higher by bentonite clay than for others clays. In consequence, the tests allowed us to choose the bentonite as the material which presents a capacity raised for the adsorption.

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