Effect of amino(poly)carboxylates on copper (II) sorption by aluminium oxide
Sorption of Cu(II) cations by crystalline aluminium oxide (γ-Al 2O 3) from aqueous solutions in the pH range of 3,5 to 10,5 was studied. Sorption of Cu(II) is increased as the pH increases (pH 50=5,7). The influence of some amino(poly)carboxylates (glycine, IDA, NTA, EDTA) on Cu(II) sorption is established. The desorbing effect of chelating agents decreases with the lowering of their complexonate stability in the sequence: EDTA>NTA>IDA>glycine. Possible mechanisms of sorption processes in comparison with mathematical modeling of equilibria in the systems Cu(II)-chelating agent-Al 2O 3 are discussed. The consequences of remobilization effect of chelating agents on the state of Cu(II) ions in environmental systems are analyzed.