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首页> 外文期刊>Journal of industrial and engineering chemistry >Removal of sudan dyes from aqueous solution by magnetic carbon nanotubes: Equilibrium, kinetic and thermodynamic studies
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Removal of sudan dyes from aqueous solution by magnetic carbon nanotubes: Equilibrium, kinetic and thermodynamic studies

机译：磁性碳纳米管去除水溶液中的苏丹红：平衡，动力学和热力学研究

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In this study, magnetic carbon nanotubes (MCNTs) have been synthesized by hydrothermal synthesis of Fe3O4 nanoparticles onto carbon nanotubes, and characterized by Fourier transform infrared spectroscopy, transmission electron microscope and physical property measurement system. They were used as adsorbents for the removal of sudan I, sudan II, sudan III, and sudan IV from aqueous solution. The effects of experimental parameters on adsorption were fully studied. The results showed that 5 mg MCNTs can remove sudan dyes sufficiently from 20 mL aqueous solution within 60 min at pH in the range of 4-7. Moreover, the existence of NaCl favored the adsorption. The sorbents can be reused more than ten times with 2% acetic acid ethanol as desorption solution. The equilibrium, kinetic and thermodynamic studies were investigated. The resultant kinetic data were well described by the pseudo-second-order model. The Freundlich model fitted sudan dyes sorption isotherms better than the Langmuir model. The thermodynamic data calculated from the temperature dependent sorption isotherms demonstrated that sudan dyes sorption on the MCNTs was a spontaneous process. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：在这项研究中，磁性碳纳米管（MCNTs）是通过将Fe3O4纳米颗粒水热合成到碳纳米管上而合成的，并通过傅里叶变换红外光谱，透射电子显微镜和物理性质测量系统进行了表征。它们用作吸附剂，用于从水溶液中去除苏丹红I，苏丹II，苏丹III和苏丹IV。充分研究了实验参数对吸附的影响。结果表明，5 mg MCNTs可以在60 min内，在4-7的pH值范围内从20 mL水溶液中充分去除苏丹红染料。而且，NaCl的存在有利于吸附。用2％乙酸乙醇作为解吸溶液，吸附剂可以重复使用十次以上。研究了平衡，动力学和热力学研究。所得的动力学数据通过伪二级模型很好地描述了。 Freundlich模型拟合苏丹染料的吸附等温线优于Langmuir模型。由温度依赖性吸附等温线计算的热力学数据表明，苏丹染料吸附在MCNT上是自发过程。 （C）2014韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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