Removal of Heavy Metals by Sawdust Adsorption: Equilibrium and Kinetic Studies

  • Lim, Ji-Hyun (Department of Civil Engineering, Kyunghee University) ;
  • Kang, Hee-Man (Korea Highway & Transportation Technology Institute) ;
  • Kim, Lee-Hyung (Department of Civil and Environmental Eng., Kongju National University) ;
  • Ko, Seok-Oh (Department of Civil Engineering, Kyunghee University)
  • Published : 2008.06.28


Adsorption of heavy metals by sawdust was investigated to evaluate the effectiveness of using sawdust to remove heavy metals from aqueous solutions. Kinetic and isotherm studies were carried out by considering the effects of initial concentration and pH. The adsorption isotherms of heavy metals fitted the Langmuir or Freundlich model reasonably well. The adsorption capacity of metal was in the order $Pb^{2+}$ > $Cu^{2+}$ > $Zn^{2+}$. A high concentration of co-existing ions such as $Ca^{2+}$ and $Mg^{2+}$ depressed the adsorption of heavy metal. Adsorption data showed that metal adsorption on sawdust follows a pseudo-second-order reaction. Kinetic studies also indicated that both surface adsorption and intraparticle diffusion were involved in metal adsorption on sawdust. Column studies prove that sawdust could be effective biosorbent for the removal of heavy metals from aqueous phase.


Adsorption;Breakthrough;Heavy metal;Isotherm;Kinetics;Sawdust


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