Far Hossein Shahriyari, Hasanzadeh Mahdi, Nashtaei Mohammad Shabani, Rabbani Mahboubeh, Haji Aminoddin, Hadavi Moghadam Bentolhoda
Department of Chemistry, Iran University of Science and Technology, P.O. Box, Narmak 16846-13114, Tehran, Iran.
Department of Textile Engineering, Yazd University, P.O. Box, 89195-741 Yazd, Iran.
ACS Appl Mater Interfaces. 2020 Jun 3;12(22):25294-25303. doi: 10.1021/acsami.0c04953. Epub 2020 May 21.
Herein, a magnetic zirconium-based metal-organic framework nanocomposite was synthesized by a simple solvothermal method and used as an adsorbent for the removal of direct and acid dyes from aqueous solution. To enhance its adsorption performance, poly(propyleneimine) dendrimer was used to functionalize the as-synthesized magnetic porous nanocomposite. The dendrimer-functionalized magnetic nanocomposite was characterized by field-emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption/desorption isotherms, and vibration sample magnetometer. The obtained results revealed the successful synthesis and functionalization of the magnetic nanocomposite. The adsorbents exhibited good magnetic properties with high saturation magnetization and high specific surface area. The adsorption isotherms and kinetics of anionic dyes were described by the Freundlich and pseudo-second-order models, respectively. It was found that the kinetics of adsorption of both the investigated dyes by the dendrimer-functionalized magnetic composite is considerably faster than the magnetic composite under the same condition. The adsorption capacity of the dendrimer-functionalized magnetic composite for investigated direct and acid dyes was 173.7 and 122.5 mg/g, respectively, which was higher than those of the existing magnetic adsorbents. This work provides new insights into the synthesis and application of hybrid magnetic adsorbents with synergistic properties of nanoporous metal-organic frameworks and dendrimer with a large number of functional groups for the removal of organic dyes.
在此，通过简单的溶剂热法合成了一种磁性锆基金属有机框架纳米复合材料，并将其用作从水溶液中去除直接染料和酸性染料的吸附剂。为了提高其吸附性能，使用聚（丙烯亚胺）树枝状大分子对合成的磁性多孔纳米复合材料进行功能化。通过场发射扫描电子显微镜、X射线衍射、傅里叶变换红外光谱、氮吸附/脱附等温线和振动样品磁强计对树枝状大分子功能化的磁性纳米复合材料进行了表征。所得结果表明成功合成并功能化了磁性纳米复合材料。吸附剂表现出良好的磁性，具有高饱和磁化强度和高比表面积。阴离子染料的吸附等温线和动力学分别用Freundlich模型和准二级模型描述。发现在相同条件下，树枝状大分子功能化的磁性复合材料对两种研究染料的吸附动力学比磁性复合材料快得多。树枝状大分子功能化的磁性复合材料对研究的直接染料和酸性染料的吸附容量分别为173.7和122.5 mg/g，高于现有磁性吸附剂。这项工作为具有纳米多孔金属有机框架和具有大量官能团的树枝状大分子协同特性的混合磁性吸附剂的合成和应用提供了新的见解，用于去除有机染料。
