Sorption of lead on Iranian bentonite and zeolite: kinetics and isotherms |
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| Authors: | Mohsen Hamidpour Mahmoud Kalbasi Majid Afyuni Hossein Shariatmadari Gerhard Furrer |
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| Institution: | (1) Department of Soil Science, Isfahan University of Technology, 83156-8111 Isfahan, Iran;(2) ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, 8092 Zurich, Switzerland |
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| Abstract: | This study deals with the use of the natural, low-cost sorbents bentonite and zeolite for the removal of lead from aqueous
solutions. The mineral material is from large deposits of bentonite and zeolite that have been discovered recently in Iran.
Experimental and modeling data from our kinetic and equilibrium investigations reveal that (1) the pseudo-second-order kinetic
model gave the best fit, and (2) the Koble–Corrigan sorption model describes the interaction between Pb(II) and the two mineral
materials better than the Freundlich and Langmuir models. However, the sorption of Pb(II) ions by zeolite and bentonite is
complex and probably involves several mechanisms. The experimental data show that natural zeolite and bentonite used in this
study exhibited a reasonable sorption capacity for Pb(II), and thus may be useful for the immobilization of Pb(II) from polluted
sites. |
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