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Articles by W.A.H.W. Ilias
Total Records ( 1 ) for W.A.H.W. Ilias
  M.A.K.M. Hanafiah , W.S.W. Ngah , S.C. Ibrahim , H. Zakaria and W.A.H.W. Ilias
  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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