Ostroski Indianara C, Barros Maria A S D, Silva Edson A, Dantas João H, Arroyo Pedro A, Lima Oswaldo C M
State University of Maringá, Chemical Engineering Department, Maringá - Brazil 5790 Colombo Av., Bl. D-90, 87020-900 Maringá, Brazil.
J Hazard Mater. 2009 Jan 30;161(2-3):1404-12. doi: 10.1016/j.jhazmat.2008.04.111. Epub 2008 May 3.
The uptake capacity of Fe(III) and Zn(II) ions in NaY zeolite was investigated. Experiments were carried out in a fixed bed column at 30 degrees C, pH 3.5 and 4.5 for Fe(III) and Zn(II), respectively, and an average particle size of 0.180 mm. In order to minimize the diffusional resistances the influence of flow rate on the breakthrough curves at feed concentrations of 1.56 meq/L for Fe(III) and 0.844 meq/L for Zn(II) was investigated. Flow rate of the minimal resistance in the bed according to mass transfer parameter were 2.0 mL/min for iron and 8.0 mL/min for zinc ions. Freundlich and Langmuir isotherm models have been used to represent the column equilibrium data. The iron dynamic isotherm was successfully modeled by the Langmuir equation and this mathematical model described well the experimental breakthrough curves for feed concentrations from 0.1 up to 3.5 meq/L. The zinc dynamic isotherm was successfully modeled by the Freundlich equation. This equilibrium model was applied to mathematical model. Experimental breakthrough curves could be predicted. Experiments were also carried out in a batch reactor to investigate the kinetics adsorption of the ions Fe(III) and Zn(II). Langmuir kinetic model fit well both experimental data.
研究了NaY沸石对Fe(III)和Zn(II)离子的吸附容量。实验在固定床柱中进行，温度为30℃，Fe(III)对应的pH值为3.5，Zn(II)对应的pH值为4.5，平均粒径为0.180 mm。为了使扩散阻力最小化，研究了流速对进料浓度为1.56 meq/L的Fe(III)和0.844 meq/L的Zn(II)的穿透曲线的影响。根据传质参数，床层中阻力最小的流速，铁离子为2.0 mL/min，锌离子为8.0 mL/min。Freundlich和Langmuir等温线模型已被用于表示柱平衡数据。铁的动态等温线成功地用Langmuir方程建模，该数学模型很好地描述了进料浓度从0.1到3.5 meq/L的实验穿透曲线。锌的动态等温线成功地用Freundlich方程建模。该平衡模型应用于数学模型。可以预测实验穿透曲线。还在间歇反应器中进行了实验，以研究Fe(III)和Zn(II)离子的动力学吸附。Langmuir动力学模型与两个实验数据都拟合得很好。
