摘要
利用批实验方法在293K下研究了蒙脱石对水溶液中Pb2+的吸附行为。对吸附平衡时间、溶液酸碱度和初始浓度等吸附条件进行了研究。对实验数据分别采用Langmuir,Freundlich和Dubinin-Radushkevich (D-R)等温吸附模型进行了拟合,结果表明Langmuir吸附等温方程拟合效果最好,相关系数R为0.9989。通过Langmuir等温吸附模型得出在293K时,蒙脱石对铅离子的理论饱和吸附容量为133mg/g。通过D-R等温吸附模型得到吸附自由能为2.43kJ/mol,表明此吸附过程主要为物理吸附。利用准二级动力学方程拟合实验数据得到了相关系数为1。
In this paper,the adsorption of lead（Ⅱ） from aqueous solution by montmorillonite was studied at 293 K using batch equilibrium approach.The adsorption conditions,such as the contact time,solution pH and the initial concentrations were studied.The adsorption was well described by the Langmuir adsorption isotherm model,Freundlich isotherm model and Dubinin-Radushkevich（D-R） isotherm model,in which the fit effect of Langmuir adsorption isotherm model is best with the correlation coefficient of 0.998 9.The theoretical saturated adsorption capacity of montmorillonite for lead（Ⅱ） at 293 K calculated by Langmuir constants was 133 mg/g.The value of the adsorption mean energy calculated by D-R constants was 2.43 kJ/mol,which indicated that the adsorption process was predominant by physical adsorption process.The pseudo second-order kinetic model provided the best correlation to the experimental data.
出处
《环境科技》
2010年第3期5-8,共4页
Environmental Science and Technology
基金
国家高技术研究发展计划(863)课题(2007AA06A410-01)
关键词
蒙脱石
吸附
铅离子
Montmorillonite
Adsorption
Lead ion
