累托石吸附处理含铅废水试验结果

Rectorite Adsorption Treatment Results of Lead-Containing Wastewater

选取累托石作为吸附剂用于废水中铅离子的去除,探究铅离子初始浓度、吸附剂投加量、反应时间、温度等因素对铅离子去除的影响。实验结果表明:REC吸附处理Pb(II)的最佳条件为:初始浓度100 mg•L−1、累托石用量5 g•L−1、吸附温度25℃、吸附时间40 min,Pb(II)去除率可达62.12%。累托石吸附Pb(II)能较好地拟合Langmuir模型,该材料吸附处理铅离子过程更加符合准二级动力学模型。累托石对Pb(II)的去除过程以化学吸附为主导,反应过程与累托石表面的活性位点和吸附质之间的离子交换速率、表面沉淀有关。

The rectorite was applied to remove lead-containing ion of wastewater in laboratory experiment. The influencing factors such as the initial lead ion concentration, rectorite dosage, reaction time and the temperature were investigated. The experiment results and optimal conditions for rectorite adsorption treatment of Pb(II) are that the initial concentration, rectorite dosage, adsorption temperature and time are 100 mg∙L−1, 25˚C, 5 g∙L−1 and 40 min, respectively. The removal rate of lead ion can reach 62.12%. The adsorption isotherm was well described by Langmuir model and the process of adsorption kinetic data fitted a pseudo-second-order model. The removal process of rectorite for Pb(II) was dominated by chemical adsorption and related to the ion exchange and surface precipitation between the active sites on rectorite surface and adsorbate.