焦粉基碳吸附材料对铜(Ⅱ)离子的吸附特性

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

采用硝酸预氧化焦粉、氯化锌化学活化法制备了焦粉基碳吸附材料。考察了焦粉基碳吸附材料对水中铜(Ⅱ)离子的吸附特性。实验结果表明,焦粉基碳吸附材料吸附平衡时间90min,该吸附过程符合Langmuir型吸附模型;不同温度下的ΔHθ>0、ΔGθ<0,证实其吸附过程是一个自发吸热过程;ΔSθ>0,表明铜离子在固液界面有序性减小、混乱度增大。对实验数据进行数学模型拟合,二级相关系数R2=0.9991,显示吸附过程动力学与二级动力学模型相关性较好。

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 ΔHθ 〉 0, ΔGθ 〈 0 at different temperatures reveal that the adsorption was a spontaneous endothermic process, and that ΔSθ 〉 0 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.