Kinetics and thermodynamics of adsorption of methylene blue by a magnetic graphene-carbon nanotube composite
Kinetics and thermodynamics of adsorption of methylene blue by a magnetic graphene-carbon nanotube composite
复制标题
磁性石墨烯-碳纳米管复合材料吸附亚甲基蓝的动力学和热力学
DOI：
10.1016/j.apsusc.2013.11.010
复制
发表时间：
2014-01-30
影响因子：
6.7
通讯作者：
Qian, Jin
中科院分区：
文献类型：
--
作者：
Wang, Peifang;Cao, Muhan;Qian, Jin
采用溶剂热法制备了一种由石墨烯、多壁碳纳米管（MWCNTs）和Fe 3 O 4纳米颗粒组成的新型磁性复合吸附剂。采用X射线衍射、扫描电镜、X射线荧光光谱和傅里叶变换红外光谱对所制备的吸附剂进行了表征。对吸附前后的样品进行了傅里叶变换红外光谱分析和粒度分布测定。通过对亚甲基蓝的吸附研究了复合材料的性能。结果表明，样品的最大吸附量为65.79 mg g（-1），几乎等于磁性石墨烯和磁性MWCNTs的吸附量之和。研究了pH和温度对磁性吸附剂吸附亚甲基蓝的影响。动力学符合准二级动力学模型和粒内扩散模型，等温线符合Langmuir等温式。此外，所制备的复合材料被发现是可再生和可重复使用。并对人工染料废水的处理及成本估算进行了探讨。因此，磁性复合材料具有良好的吸附性能、磁性分离性和可回收性，是一种很有潜力的染料污染物吸附剂。(C)2013爱思唯尔有限公司版权所有。
A solvothermal method was employed to prepare a novel magnetic composite adsorbent composed of graphene, multi-walled carbon nanotubes (MWCNTs) and Fe3O4 nanoparticles. The prepared adsorbents were characterized by X-ray diffraction, scanning electron microscopy and X-ray fluorescence spectrometry and Fourier transform infrared spectroscopy. Fourier transform infrared spectroscopy and the particle size distribution of the samples before and after adsorption was also carried out. The performance of as-prepared composites was investigated by the adsorption of dye methylene blue. Results showed that the maximum adsorption capacity of the samples was up to 65.79 mg g(-1), which was almost equal to the sum of magnetic graphene and magnetic MWCNTs. The effect of pH and temperature on the adsorption performance of methylene blue onto the magnetic adsorbents was investigated. The kinetic was well-described by pseudo-second-order and intraparticle diffusion model, while the isotherm obeyed the Langmuir isotherm. Furthermore, the as-prepared composites were found to be regenerative and reusable. The application in the treatment of an artificial dye wastewater and its cost estimation were also discussed. Therefore, the as-prepared magnetic composites can be severed as a potential adsorbent for removal of dye pollutant, owing to its high adsorption performance, magnetic separability and efficient recyclable property. (C) 2013 Elsevier B.V. All rights reserved.