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The adsorption of multi-metal ions of lead (Pb), copper (Cu), and chromium (Cr) was carried out in a binary solution systems of Pb(II)-Cr(III), Cr(III)-Cu(II), and Pb(II)-Cu(II) using a diphenylcarbazide immobilized silica gel adsorbent (Si-DPZIDA) by bath adsorption method at pH 2 and 8 hours stirring time. The binary solution system consists of major metal ions and co-cations, wherein the co-cation metal concentration were varies from 0.5, 1.0, and 1.5 mM, while concentration of major metal ions remained 5.0 mM. The purpose of this multi ion metal adsorption is to know the effect of the presence of co-cation on the adsorption of major metal ions. The results showed that the presence of Cr(III) and Cu(II) as co-cation gave a synergistic effect on the absorption capacity of Pb(II). The highest synergistic occurred at Cr(III) concentration of 1.5 M and that of Cu(II) of 1.0 mM with absorption capacity of Pb(II) each 0.5808 and 0.5867 mmol/g. The adsorption power of Cr(III) metal experiences a synergistic effect in the presence of co-cations Pb(II) and Cu(II). The largest synergistic effect occurred at the Pb(II) concentrations of 0.5 mM and Cu(II) 0.5 mM, respectively with Cr(III) sorption 0.1041 and 0.1010 mmol/g. In the adsorption of major Cu(II) metal ions, the presence of Cr(III) and Pb(II) gives antagonistic effects. The highest antagonistic effect occurred in the presence of Cr(III) and Pb(II) co-cations at 0.5 mM and 0.5 mM concentrations, with Cu(II) absorption of 0.2768 and 0.2736 mmol /g.

ADSORPSI MULTI LOGAM BERAT KROM(III), TIMBAL(II), DAN TEMBAGA(II) DALAM SISTEM LARUTAN BINARY OLEH SILIKA GEL TERIMOBILISASI DIFENILKARBAZIDA