Abstract
Factors influencing the adsorption behavior of heavy metals, viz Cu(II), Zn(II), Cd(II), Pb(II) and Ni(II), onto Al2O3 from aqueous solutions containing complexing ligands were investigated using batch adsoption experiments. For the Cu(II)/NTA/ γ-Al2O3, system, increasing the system ionic strength reduced Cu adsorption through activity coefficient and surface electrical double layer effects. The presence of alkaline earth cations (Ca(II) and Mg(II)) also reduced Cu removal from solution by lowering the ability of NTA to prevent Cu(OH)2 precipitation and through specific adsorption to the alumina surface. The adsorption of the heavy metals on Al2O3 from solutions containing NTA followed the sequence: Cu >Zn > Cd > Pb ≈ Ni. Increase in system temperature tended to decrease metal adsorption.
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