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首页> 外文期刊>Applied Surface Science >Removal of lead(Ⅱ) by adsorption onto Viscum album L.: Effect of temperature and equilibrium isotherm analyses
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Removal of lead(Ⅱ) by adsorption onto Viscum album L.: Effect of temperature and equilibrium isotherm analyses

机译：吸附在Viscum album L上的去除铅（Ⅱ）：温度和平衡等温线分析的影响

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摘要

The removal efficiency of Viscum album L. from lead containing aqueous solutions was investigated. The effect of adsorbent mass, pH of solution, initial Pb(Ⅱ) concentration and temperature was investigated using a batch adsorption technique. The optimum pH for Pb(Ⅱ) adsorption was found as 3.0 for Viscum album L. Results were analyzed by the Langmuir, Freundlich, Temkin and Harkins-Jura, equation using linearized correlation coefficient at different temperature. The characteristic parameters for each isotherm have been determined. The Langmuir model agrees very well with experimental data than the other models. According to Langmuir isoterm, the monolayer saturation capacity (Q_o) is 769.23 mg/g at 25℃. Models and the isotherm constant were evaluated depending on temperature. Thermodynamic parameters such as ΔH~o, ΔS~o and ΔG~o were calculated. The adsorption process was found to be endothermic and spontaneous. The experimental data were analyzed using the first- and the second-order kinetic models. The rate constants of adsorption for both kinetics models have been calculated. The second-order model provides the best correlation of the data.
机译：研究了Viscum album L.从含铅水溶液中的去除效率。采用间歇吸附技术研究了吸附剂质量，溶液pH，初始Pb（Ⅱ）浓度和温度的影响。对于Viscum album L，Pb（Ⅱ）的最佳吸附pH为3.0。采用Langmuir，Freundlich，Temkin和Harkins-Jura等式，使用线性相关系数在不同温度下对结果进行了分析。已经确定了每个等温线的特征参数。与其他模型相比，Langmuir模型与实验数据非常吻合。根据Langmuir等项，在25℃下单层饱和容量（Q_o）为769.23 mg / g。根据温度评估模型和等温常数。计算了ΔH〜o，ΔS〜o和ΔG〜o等热力学参数。发现吸附过程是吸热的和自发的。使用一阶和二阶动力学模型分析了实验数据。已经计算了两种动力学模型的吸附速率常数。二阶模型提供了数据的最佳相关性。

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