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首页> 外文期刊>The Canadian Journal of Chemical Engineering >Kinetics, Equilibrium and Thermodynamic Studies on the Adsorptive Removal of Nickel, Cadmium and Cobalt from Wastewater by Superparamagnetic Iron Oxide Nanoadsorbents
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Kinetics, Equilibrium and Thermodynamic Studies on the Adsorptive Removal of Nickel, Cadmium and Cobalt from Wastewater by Superparamagnetic Iron Oxide Nanoadsorbents

机译：超顺磁性氧化铁纳米吸附剂吸附去除废水中镍镉钴的动力学，平衡与热力学研究。

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摘要

Because of its unique properties, such as specific functionality and large specific surface area, iron oxide nanoadsorbents had showed potential for energy and environmental applications. This work investigated the adsorptive removal of different metal ions from wastewater by superparamagnetic iron oxide nanoadsorbents (Fe3O4). Batch-adsorption technique was employed to assess the kinetic behaviour and adsorption equilibrium of cadmium, cobalt and nickel. Accordingly, the effect of the following variables on the adsorption reaction was tested, namely: solution pH, contact time and temperature. Metal ion adsorption was found to be highly pH dependent with a maximum uptake achieved around pH 5.5. Kinetic studies showed that adsorption was fast and equilibrium was achieved in less than 60min. The external mass transfer kinetic model was applied to the experimental results and provided reasonable overall volumetric mass transfer coefficients. Adsorption isotherms were determined and appropriately described by the Freundlich and Langmuir models, with a better fit to the Freundlich model. The amount of metal ion adsorbed increased as the temperature increased, suggesting an endothermic adsorption process. The thermodynamics studies indicated that the adsorption process was spontaneous and endothermic in nature.
机译：由于其独特的性能，例如特定的功能和较大的比表面积，氧化铁纳米吸附剂已显示出在能源和环境应用方面的潜力。这项工作研究了超顺磁性氧化铁纳米吸附剂（Fe3O4）对废水中不同金属离子的吸附去除。采用间歇吸附技术评价了镉，钴和镍的动力学行为和吸附平衡。因此，测试了以下变量对吸附反应的影响，即：溶液pH，接触时间和温度。发现金属离子吸附高度依赖pH，在pH 5.5左右达到最大吸收。动力学研究表明，吸附速度很快，在不到60分钟的时间内即可达到平衡。将外部传质动力学模型应用于实验结果，并提供了合理的整体体积传质系数。确定了吸附等温线，并通过Freundlich和Langmuir模型进行了适当描述，更适合Freundlich模型。随着温度的升高，金属离子的吸附量增加，表明吸热吸附过程。热力学研究表明，吸附过程是自发的并且是吸热的。

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