Adsorption of Copper Ion to Coke-based Material for Carbon Absorption

Coke-based carbon absorption material was prepared by nitric acid pre-oxidation of coke powder followed by zinc chloride chemical activation. The absorption characteristics were studied for the coke-based carbon absorbing copper ions in water. The results show that the absorption equilibrium time was 90 min,and the absorption accorded with the Langmuir model. In addition,the results of ΔHθ0,ΔGθ0 at different temperatures reveal that the adsorption was a spontaneous endothermic process,and that ΔSθ0 indicates that the order reduced and the chaos increased for the copper ion adsorption the solid-liquid interface. Finally,the experimental data were fitted to second order kinetics model and the correlation coefficient(R2) was 0.9991,suggesting that the adsorption followed second order kinetics.