活性炭对含铅废水吸附特性研究

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0RL1,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。

Study on adsorption characteristics of activated carbon to leaded wastewater

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 C_e/q_e = 0. 4298 +0. 0594C_e ( 25 ℃) , and the equation was consistent with the Langmuir absorption model. The adsorption equation parameters ( R_L) , which were between 0 and 1 at different temperatures, proved that adsorption was beneficial to process. The experiment was well fitted by math-ematical model with the secondary correlation coefficient ( R~2 ) being 0. 9998. Meanwhile the adsorption was con-firmed 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~θ showed that the absorption was a physical process.