Rahbari Meysam, Goharrizi Ataallah Soltani
Chemical Engineering Department, Shahid Bahonar University, Kerman, Iran.
Water Environ Res. 2009 Jun;81(6):598-607. doi: 10.2175/106143008x370511.
Adsorption of lead(II) from water on carbon nanotubes (CNTs) was investigated using a series of batch adsorption experiments. The adsorption rate was studied experimentally at various temperatures, contact times, and initial pH and lead(II) concentrations. It was observed that a considerable amount of lead(II) was adsorbed during the first 5 minutes of contact time. The pH of the solution strongly influenced the amount of adsorption, and the best results were obtained when pH value was approximately 6. For the adsorption isotherm, the experimental data were analyzed by three two-parameter isotherms (Langmuir, Freundlich, and Temkin) and four three-parameter isotherms (Redhich-Peterson, Sips, Toth, and Khan). The three kinetic models used to test the experimental data were Lagergren first-order, second-order, and the Elovich equation. The results obtained from the study of the thermodynamic parameters showed that the adsorption of lead(II) onto CNTs was a spontaneous and endothermic process.
通过一系列批量吸附实验研究了碳纳米管（CNTs）对水中铅（II）的吸附。在不同温度、接触时间、初始pH值和铅（II）浓度下对吸附速率进行了实验研究。观察到在接触的前5分钟内有大量的铅（II）被吸附。溶液的pH值对吸附量有很大影响，当pH值约为6时获得了最佳结果。对于吸附等温线，实验数据通过三种双参数等温线（朗缪尔等温线、弗伦德利希等温线和坦金等温线）和四种三参数等温线（雷迪希-彼得森等温线、西普斯等温线、托特等温线和汗等温线）进行分析。用于测试实验数据的三种动力学模型分别是 Lagergren 一级模型、二级模型和埃洛维奇方程。对热力学参数研究获得的结果表明，铅（II）在碳纳米管上的吸附是一个自发的吸热过程。
