The removal of heavy metal ions (Cu(2+) and Ni(2+)) from aqueous solution using oyster shell particles was studied. The adsorption amount of Cu(2+) and Ni(2+) onto the adsorbents was in the following order; Heat treated oyster shell> ethanol treate...
The removal of heavy metal ions (Cu(2+) and Ni(2+)) from aqueous solution using oyster shell particles was studied. The adsorption amount of Cu(2+) and Ni(2+) onto the adsorbents was in the following order; Heat treated oyster shell> ethanol treated oyster shell> raw oyster shell. The adsorption equilibrium data for Cu(2+) and Ni(2+) onto the adsorbents were correlated with three adsorption model such as the Langmuir, Freundlich and Sips isotherm. Among them, the Freundlich isotherm gave the best fit to our data. The differences in the rate of adsorption for Cu(2+) and Ni(2+) onto the adsorbents are primarily attributable to the differences in the equilibrium.