Multi-component adsorption of heavy metal ions from aqueous solutions onto low cost adsorbent based on rice husks

  • 1 Institute of General and Inorganic Chemistry-Bulg.Acad.Sci., Sofia, Bulgaria
  • 2 University of Chemical Technology and Metallurgy-Sofia,, Bulgaria


A novel low cost adsorbent based on rice husks was obtained by slow pyrolysis at temperature 350°C and was characterized by means of SEM, Hg-porosimetry and N2-adsorption. The adsorption properties of the investigated material towards Fe(III), Pb(II), Cr(III) and Cu(II) ions in multi-component aqueous solutions with different concentrations and acidity were studied in a batch system. The adsorption of metals is significantly affected by the pH value. Equilibrium experimental data were fitted to linear Langmuir and Freundlich model and maximum adsorption capacities were calculated. Kinetic of adsorption in multi-component solutions was also investigated



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