Department of Chemistry, Gaziosmanpasa University, 60250 Tokat, Turkey.
J Hazard Mater. 2009 Nov 15;171(1-3):973-9. doi: 10.1016/j.jhazmat.2009.06.101. Epub 2009 Jun 26.
This paper presents the equilibrium, thermodynamic and kinetic studies on aluminum biosorption from aqueous solution by brown algae (Padina pavonica) biomass. Optimum biosorption conditions were determined as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm of Al(III) by P. pavonica biomass. The biosorption capacity of P. pavonica biomass was found as 77.3mg/g. The metal ions were desorbed from P. pavonica using 1M HCl. The high stability of P. pavonica permitted a slight decrease about 20% in the recovery of Al(III) ions after 10 times of adsorption-elution process. The mean free energy value evaluated from the D-R model indicated that the biosorption of Al(III) onto P. pavonica biomass was taken place by chemical ion exchange. The calculated thermodynamic parameters, DeltaG degrees , DeltaH degrees and DeltaS degrees showed that the biosorption of Al(III) onto P. pavonica biomass was feasible, spontaneous and endothermic under examined conditions. Experimental data was also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of Al(III) onto P. pavonica biomass followed well pseudo-second-order kinetics.
本文介绍了从水溶液中用褐藻（Padina pavonica）生物质吸附铝的平衡、热力学和动力学研究。确定了最佳吸附条件，作为 pH 值、生物量剂量、接触时间和温度的函数。朗缪尔、弗雷德里希和杜宾-拉什科夫斯基（D-R）模型被用来描述 P. pavonica 生物质对 Al(III)的吸附等温线。P. pavonica 生物质的吸附容量为 77.3mg/g。用 1M HCl 从 P. pavonica 上解吸金属离子。P. pavonica 的高稳定性允许在 10 次吸附-洗脱过程后，Al(III)离子的回收率略有下降约 20%。从 D-R 模型评估的平均自由能值表明，Al(III)在 P. pavonica 生物质上的吸附是通过化学离子交换发生的。计算得到的热力学参数 DeltaG degrees 、DeltaH degrees 和 DeltaS degrees 表明，在所研究的条件下，Al(III)在 P. pavonica 生物质上的吸附是可行的、自发的和吸热的。实验数据也根据准一级和准二级动力学模型进行了吸附动力学测试。结果表明，Al(III)在 P. pavonica 生物质上的吸附过程很好地遵循了准二级动力学。
