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Journal of Applied Sciences

Year: 2006 | Volume: 6 | Issue: 13 | Page No.: 2762-2767
DOI: 10.3923/jas.2006.2762.2767
Kinetics and Thermodynamic Study of Lead Adsorption from Aqueous Solution onto Rubber (Hevea brasiliensis) Leaf Powder
M.A.K.M. Hanafiah, W.S.W. Ngah, S.C. Ibrahim, H. Zakaria and W.A.H.W. Ilias

Abstract: The ability of rubber or Hevea Brasiliensis (HB) leaf powder to adsorb Pb2+ from aqueous solution has been investigated through batch experiments. The Pb2+ adsorption was found to be dependent on contact time, initial Pb2+ concentration and temperature. The kinetic processes of Pb2+ adsorption onto HB leaf powder were described by applying pseudo-first-order and pseudo-second-order rate equations. The kinetics data for the adsorption process obeyed pseudo-second-order equation. The equilibrium data were described well by the Langmuir and Freundlich isotherms. The maximum adsorption capacity determined from the Langmuir isotherm was found to be 46.73 mg g-1 at 303 K. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were also calculated. The adsorption process was found to be exothermic and spontaneous in nature. The studies showed that HB leaf powder could be used as a good adsorbent material for Pb2+ removal from aqueous solution.

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M.A.K.M. Hanafiah, W.S.W. Ngah, S.C. Ibrahim, H. Zakaria and W.A.H.W. Ilias, 2006. Kinetics and Thermodynamic Study of Lead Adsorption from Aqueous Solution onto Rubber (Hevea brasiliensis) Leaf Powder. Journal of Applied Sciences, 6: 2762-2767.

Keywords: Rubber leaf powder, adsorption, lead, kinetics, thermodynamic and isotherm

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