Proceedings of The International Conference on Research in Science and Technology
Surface modification of olive stone wastes for enhanced sorption properties of cadmium and lead ions
Mahmoud Belalia, Meriem Bendjelloul, Abdallah Aziz and El hadj Elandaloussi
This paper reports the synthesis and characterization of an efficient anionic olive stone wastes-based material as new ion-exchanger adsorbent. The olive stone wastes were subjected to an alkaline pretreatment in order to enhance their reactivity towards maleic anhydride. The maleated material MOS was characterized by FTIR, 13C NMR, TGA and DSC. The resulting sodiated material NaMOS was subjected to batch experiments in order to evaluate its cadmium and lead removal efficiency. Adsorption experimental data showed a uniform and rapid process. Both Langmuir and Freundlich isotherm models were found to fit adequately the equilibrium isotherm data. The sorption capacities reached 240.96 mgCd g−1 and 127.38 mgPb g−1. Thermodynamic parameters showed that the process was exothermic and the adsorption occurred spontaneously. Desorption experiments show a quantitative recovery of the metal ions from NaMOS material.
Keywords: alkaline treatment; functionalization; metal removal; olive stone; regeneration; sorption.