Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt.
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
Carbohydr Polym. 2021 Aug 1;265:118084. doi: 10.1016/j.carbpol.2021.118084. Epub 2021 Apr 19.
Metal organic frameworks (MOFs) have become premium candidates for the removal of hazardous contaminants from wastewater. However, MOFs have a vast obstacle which is their poor recyclability. In this study, ZIF-67 was decorated with magnetic FeO nanoparticles, and then embedded into aminated chitosan (AmCs) matrix to form core-dual shell FeO/ZIF-67@AmCs composite beads. Diverse analysis tools were utilized to ensure the successful fabrication of the magnetic composite beads. The fabricated magnetic composite beads were examined their adsorptive removal aptitude towards toxic Cr(VI) ions. The gained results refereed that a maximum adsorption capacity of 119.05 mg/g was attained by magnetic FeO/ZIF-67@AmCs composite beads at 25 °C. The process obeyed both of Langmuir and Freundlich isotherm models, and the pseudo 2nd order was more suitable kinetic model to represent the adsorption process. Besides, FeO/ZIF-67@AmCs composite showed an excellent recyclability for the removal of Cr(VI) ions from their aqueous solutions for seven consecutive cycles.
金属有机骨架（MOFs）已成为从废水中去除有害污染物的首选材料。然而，MOFs 存在一个巨大的障碍，即它们的回收性差。在本研究中，ZIF-67 用磁性 FeO 纳米粒子进行修饰，然后嵌入到氨基化壳聚糖（AmCs）基质中，形成核-壳双层 FeO/ZIF-67@AmCs 复合珠。利用多种分析工具来确保磁性复合珠的成功制备。研究了制备的磁性复合珠对有毒 Cr(VI)离子的吸附去除性能。结果表明，在 25°C 下，磁性 FeO/ZIF-67@AmCs 复合珠对 Cr(VI)离子的最大吸附容量为 119.05mg/g。该过程同时遵循 Langmuir 和 Freundlich 等温线模型，准二级动力学模型更适合描述吸附过程。此外，FeO/ZIF-67@AmCs 复合珠在从水溶液中去除 Cr(VI)离子的七个连续循环中表现出优异的可回收性。
