NaOH改性粉煤灰对废水中Pb^(2+)的吸附特性研究

Adsorption Behaviors of Pb^(2+)in Wastewater by NaOH Modified Fly Ash

采用批吸附试验探究NaOH改性粉煤灰对含Pb2+废水吸附特性。结果表明,NaOH改性粉煤灰对Pb2+具有较强的吸附效果,在固液比为0.9 g/L、温度为25℃、Pb^(2+)溶液质量浓度为100 mg/L条件下,吸附反应在30 min基本达到平衡,Pb2+去除率为96.02%,吸附容量为106.69 mg/g。由吸附等温线模型得出吸附主要在单分子层表面进行。吸附动力学特征表明吸附主要限速步骤为化学吸附。吸附反应存在物理吸附和化学吸附。

In this paper,batch adsorption experiments were used to explore the adsorption characteristics of NaOH modified fly ash on Pb^(2+)containing wastewater.The results show that NaOH modified fly ash has a strong adsorption effect on Pb^(2+).Under the conditions of the solid-liquid ratio of 0.9 g/L,the temperature of 25℃and Pb^(2+)solution concentration of 100 mg/L,the adsorption reaction basically reached equilibrium in 30 min,the removal rate of Pb^(2+)reached 96.02%,and the adsorption capacity reached 106.69 mg/g.The adsorption isotherm model showed that the adsorption mainly took place on the surface of the monolayer.The adsorption kinetics showed that the main rate-limiting step was chemical adsorption.There were both physical adsorption and chemical adsorption in the adsorption reaction.