Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2006.2762.2767Hevea brasiliensis) Leaf Powder]]>M.A.K.M. Hanafiah W.S.W. Ngah S.C. Ibrahim H. Zakaria W.A.H.W. Ilias 122006613The 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.]]>Anonymous,2000Atkins, P.W.,19955th Edn.,Azizian, S.,20042764752Benhammou, A., A. Yaacoubi, L. Nibou and B. Tanouti,2005282320326Dimitrova, S.V. and D.R. Mehandgiev,19983232893292Dimitrova, S.V.,20023640014008Freundlich, H.M.F.,190657385470Gupta, V.K., C.K. Jain, I. Ali, M. Sharma and V.K. Saini,20033740384044Hanafiah, M.A.K.M., S. Shafiei, M.K. Harun and M.Z.A. Yahya,2006Hevea Brasiliensis) leaf powder.]]>517217221Horsfall, Jr. M. and A.A. Abia,2003Manihot eculenta cranz).]]>3749134923Ho, Y.S. and G. McKay,199933578584Ho, Y.S.,20033723232330Keskinkan, O., M.Z.L. Goksu, M. Basibuyuk and C.F. Forster,2004Ceratophyllum demersum).]]>92197200Kobya, M., E. Demirbas, E. Senturk and M. Ince,20059615181521Lagergren, S.,189824139Langmuir, I.,19184013611403Li, Y.H., Z. Di, J. Ding, D. Wu, Z. Luan and Y. Zhu,20052+ on carbon nanotubes.]]>39605609Low, K.S., C.K. Lee and S.C. Liew,2000365964Meena, A.K., G.K. Mishra, P.K. Rai, C. Rajagopal and P.N. Nagar,2005122161170Ngah, W.S.W., C.S. Endud and R. Mayanar,200250181190Ngah, W.S.W., A. Kamari and Y.J. Koay,200434155161Ngah, W.S.W. and A. Fatinathan,2006277214222Quek, S.Y., D.A.J. Wase and C.F. Forster,199824251256Rivera-Utrilla, J., I. Bautista-Toledo, M.A. Ferro-Garcia and C. Moreno-Castilla,200341323330Sekar, M., V. Sakthi and S. Rengaraj,2004279307313Singh, S.P., Q.Y. Ma and W.G. Harris,20013019611968Taty-Costodes, V.C., H. Fauduet, C. Porte and A. Delacroix,2003B105121142Wong, K.K., C.K. Lee, K.S. Low and M.J. Haron,2003502328Yan, G. and T. Viraraghavan,20033744864496Yu, L.J., S.S. Shukla, K.L. Dorrisa, A. Shuklab and J.L. Margrave,20031005363