摘要
采用静态法用活性炭吸附处理含铅废水,考察了活性炭对含铅废水的吸附特性。结果表明:活性炭对铅离子吸附平衡时间为100 m in;吸附等温方程为:Ce/qe=0.4298+0.0594Ce(25℃),该方程符合Langmu ir型吸附模式,不同温度下吸附平衡参数0<RL<1,表示该吸附为有利吸附。实验数据应用数学模型拟合,二级相关系数R2=0.9998,显示吸附过程动力学与二级动力学模型相关性较好;计算不同温度下各热力学参数:△Hθ大于零、△Gθ小于零,证实该吸附过程是一个自发吸热过程。△Sθ大于零,表明铅离子在固液界面有序性减小、混乱度增大。△Hθ值很小,说明该过程为物理吸附。
Activated carbons were used to adsorb the divalent lead ions in wastewater by a static method in order to study the absorption characteristics.The results showed that the absorption equilibrium time was 100 min.The adsorption isotherm equation was Ce/qe=0.4298＋0.0594Ce（25℃）,and the equation was consistent with the Langmuir absorption model.The adsorption equation parameters（RL）,which were between 0 and 1 at different temperatures,proved that adsorption was beneficial to process.The experiment was well fitted by mathematical model with the secondary correlation coefficient（R^2） being 0.9998.Meanwhile the adsorption was confirmed as a spontaneous endothermic process by the results of △H^θ〉0 and △G^θ〈0 at different temperatures;and the order reduced and the chaos increased of the divalent lead ions in the solid-liquid interface with △S^θ〉0.In addition,small value of △H^θshowed that the absorption was a physical process.
出处
《环境工程学报》
CAS
CSCD
北大核心
2010年第2期373-376,共4页
Chinese Journal of Environmental Engineering
关键词
活性炭
含铅废水
吸附等温线
吸附动力学
吸附热力学
activated carbon leaded wastewater adsorption isotherm adsorption dynamics adsorption thermodynamic
