Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran.
Sci Rep. 2023 Mar 25;13(1):4924. doi: 10.1038/s41598-023-32097-3.
In this research, magnetic metal-organic framework nanofibers were produced by the electrospinning method. The nanocomposite was functionalized by third generation hyperbranched poly(amidoamine) dendrimer (PAMAM) to improve its dye adsorption efficiency from aqueous media. The characteristics of the synthesized magnetic nanocomposite was determined by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) along with elemental mapping analysis and scanning electron microscopy (SEM). Central composite design (CCD) based on response surface methodology (RSM) was performed to optimize the adsorption variables and the values of coefficient of determination (R) and adjusted R were 0.9837 and 0.9490, respectively. The results obtained demonstrated remarkable properties of the synthesized nanofiber as adsorbent for methylene blue from aqueous solutions with the removal efficiency of 95.37% and maximum methylene blue (MB) adsorption capacity of 940.76 mg g under optimized conditions. In addition, it was shown that kinetics and adsorption isotherm of the dye removal process followed Langmuir and pseudo-second-order models, respectively. Thermodynamic study of the dye removal indicated that the process was spontaneous and favorable at higher temperatures. Also, the reusability study shows favorable dye removal efficiency of 80.67% even after 4 cycles. To investigate the performance of the adsorbent for the removal of MB in real samples, a sewage sample from a local hospital was used. The result showed good efficiency of the adsorbent.
在这项研究中，通过静电纺丝法制备了磁性金属有机骨架纳米纤维。通过第三代超支化聚（酰胺-胺）树状大分子（PAMAM）对纳米复合材料进行功能化，以提高其从水介质中吸附染料的效率。通过傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、能谱（EDS）以及元素映射分析和扫描电子显微镜（SEM）来确定合成的磁性纳米复合材料的特性。基于响应面法（RSM）的中心复合设计（CCD）用于优化吸附变量，确定系数（R）和调整 R 的值分别为 0.9837 和 0.9490。结果表明，所合成的纳米纤维作为吸附剂，对水溶液中的亚甲基蓝具有显著的吸附性能，在优化条件下，去除效率为 95.37%，最大亚甲基蓝（MB）吸附容量为 940.76mg/g。此外，结果表明，染料去除过程的动力学和吸附等温线分别遵循朗缪尔和拟二级模型。染料去除的热力学研究表明，该过程在较高温度下是自发和有利的。此外，重复使用研究表明，即使经过 4 次循环，染料去除效率仍为 80.67%。为了研究吸附剂在实际样品中去除 MB 的性能，使用当地医院的污水样品进行了研究。结果表明，吸附剂具有良好的效率。
