Analysis of metal interactions in the simultaneous adsorption of Ni(II), Cu(II) and Cd(II) on olive stones activated carbon

Th. Bohli, A. Ouederni, I. Villaescusa


This article reports the synergistic and inhibitory adsorption effects involved in the multicomponent removal of heavy metal ions (Cu(II), Ni(II), Cd(II)) from binary systems using olive stones activated carbon (COSAC) as adsorbent. In order to evaluate the adsorption capacity of COSAC to remove studied heavy metals, adsorption isotherms of single and binary systems were conducted. Mono-solute adsorption isotherms fitted into Langmuir and Sips model and the maximum adsorption capacity of COSAC decreased in the order: Cd(II)>Ni(II)>Cu(II). In binary systems the effect of initial concentration of interfering metal ions on the removal of target ones was studied. Different mutual interactions between metals ions dealing to the decrease and the enhancement of inhibitory and synergistic effects were detected. Results showed that the effects on the adsorption of the metal ions of the binary mixture strongly depend on the initial concentration of both metal ions in the solution. In most of the sceneries studied the sum of total amount of metal ions sorbed was higher than the sum of the ones obtained in single solutions suggesting synergistic interactions between the two metal ions. This study proofs that COSAC is an effective sorbent for the removal of heavy metals from multicomponent systems.

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