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首页> 外文期刊>Chemical engineering journal >Removal of Cr (VI) from aqueous solutions using chitosan/MWCNT/Fe3O4 composite nanofibers-batch and column studies
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Removal of Cr (VI) from aqueous solutions using chitosan/MWCNT/Fe3O4 composite nanofibers-batch and column studies

机译：壳聚糖/ MWCNT / Fe3O4复合纳米纤维从水溶液中去除六价铬的研究

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摘要

In the present study, the chitosan/MWCNT/Fe3O4 composite nanofibrous adsorbent was fabricated by electrospinning process and its application for the removal efficiency of Cr (VI) ions from aqueous solutions was investigated. The prepared nanoflbers were characterized using XRD, FTIR, SEM and TEM analysis. The effects of sorption parameters such as contact time, initial concentration and temperature were evaluated in a batch system. The kinetic and equilibrium data were well described by pseudo-second-order kinetic and Langmuir isotherm models. The spontaneous and endothermic nature of Cr (VI) sorption by the chitosan/MWCNT/Fe3O4 nanofibrous adsorbent was achieved. In fixed bed column studies, the Cr (VI) sorption capacity was increased by increasing the flow rate up to 4 mL min(-1). Thomas model was well predicted the adsorption capacity of Cr (VI) by the chitosan/MWCNTs/Fe3O4 nanofibers in a fixed bed column. The removal efficiency of Cr (VI) ions by the regenerated nanofibers, did not significantly change in both batch and fixed-bed column studies. The results showed the high potential of chitosan/MWCNTs/Fe3O4 nanofibers for the removal of Cr (VI) ions from water and wastewater. (C) 2015 Elsevier B.V. All rights reserved.
机译：本研究采用电纺丝工艺制备了壳聚糖/ MWCNT / Fe3O4复合纳米纤维吸附剂，并研究了其在水溶液中去除Cr（VI）离子的应用。用XRD，FTIR，SEM和TEM分析对制备的纳米纤维进行表征。在间歇系统中评估了吸附参数如接触时间，初始浓度和温度的影响。动力学和平衡数据可以通过拟二阶动力学模型和Langmuir等温线模型很好地描述。实现了壳聚糖/ MWCNT / Fe3O4纳米纤维吸附剂对Cr（VI）的自发和吸热性质。在固定床色谱柱研究中，通过将流速提高到4 mL min（-1），可以提高Cr（VI）的吸附能力。托马斯模型很好地预测了壳聚糖/ MWCNTs / Fe3O4纳米纤维在固定床柱中对Cr（VI）的吸附能力。再生纳米纤维对Cr（VI）离子的去除效率在分批和固定床色谱柱研究中均没有显着变化。结果表明，壳聚糖/ MWCNTs / Fe3O4纳米纤维在去除水中和废水中的Cr（VI）离子方面具有很高的潜力。 （C）2015 Elsevier B.V.保留所有权利。

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