Int J Phytoremediation. 2014;16(7-12):889-908. doi: 10.1080/15226514.2013.803025.
In the present study a novel biomass, derived from the pulp of Saccharum bengalense, was used as an adsorbent material for the removal of Pb (II) ions from aqueous solution. After 50 minutes contact time, almost 92% lead removal was possible at pH 6.0 under batch test conditions. The experimental data was analyzed using Langmuir, Freundlich, Timken and Dubinin-Radushkevich two parameters isotherm model, three parameters Redlich-Peterson, Sip and Toth models and four parameters Fritz Schlunder isotherm models. Langmuir, Redlich-Peterson and Fritz-Schlunder models were found to be the best fit models. Kinetic studies revealed that the sorption process was well explained with pseudo second-order kinetic model Thermodynamic parameters including free energy change (AG degrees), enthalpy change (AH degrees) and entropy change (AS degrees) have been calculated and reveal the spontaneous, endothermic and feasible nature of the adsorption process. The thermodynamic parameters of activation (deltaG(#), deltaH(#) and deltaS(#)) were calculated from the pseudo-second order rate constant by using the Eyring equation. Results showed that Pb (II) adsorption onto SB is an associated mechanism and the reorientation step is entropy controlled.
在本研究中，一种新型生物质材料，来源于糖蔗渣浆，被用作吸附剂材料，从水溶液中去除 Pb(II)离子。在批式实验条件下，接触时间为 50 分钟，pH 值为 6.0 时，铅的去除率可达近 92%。实验数据使用 Langmuir、Freundlich、Timken 和 Dubinin-Radushkevich 双参数等温模型、Redlich-Peterson、Sip 和 Toth 三参数模型以及 Fritz Schlunder 四参数等温模型进行了分析。结果表明，Langmuir、Redlich-Peterson 和 Fritz-Schlunder 模型是最佳拟合模型。动力学研究表明，吸附过程很好地符合准二级动力学模型。热力学参数包括自由能变化 (ΔG°)、焓变 (ΔH°)和熵变 (ΔS°)，通过使用 Eyring 方程，从准二级速率常数中计算出热力学参数活化能 (ΔG#)、焓变 (ΔH#)和熵变 (ΔS#)。结果表明，Pb(II)在 SB 上的吸附是一个缔合机制，重取向步骤是熵控制的。
