Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, PR China.
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, PR China.
Carbohydr Polym. 2017 Oct 15;174:1192-1200. doi: 10.1016/j.carbpol.2017.07.050. Epub 2017 Jul 18.
This study aimed to provide a continuous method for the preparation of magnetic FeO/Chitosan nanoparticles (FeO/CS NPs) that can be applied to efficient removal of heavy metal ions from aqueous solution. Using a novel impinging stream-rotating packed bed, the continuous preparation of FeO/CS NPs reached a theoretical production rate of 3.43kg/h. The as-prepared FeO/CS NPs were quasi-spherical with average diameter of about 18nm and saturation magnetization of 33.5emu/g. Owing to the strong metal chelating ability of chitosan, the FeO/CS NPs exhibited better adsorption capacity and faster adsorption rates for Pb(II) and Cd(II) than those of pure FeO. The maximum adsorption capacities of FeO/CS NPs for Pb(II) and Cd(II) were 79.24 and 36.42mgg, respectively. In addition, the FeO/CS NPs shown excellent reusability after five adsorption-desorption cycles. All the above results provided a potential method for continuously preparing recyclable adsorbent with a wide prospect of application in wastewater treatment.
本研究旨在提供一种连续的方法来制备磁性 FeO/壳聚糖纳米粒子（FeO/CS NPs），可用于从水溶液中高效去除重金属离子。使用新型冲击流-旋转填充床，FeO/CS NPs 的连续制备达到了 3.43kg/h 的理论产率。所制备的 FeO/CS NPs 呈准球形，平均直径约为 18nm，饱和磁化强度为 33.5emu/g。由于壳聚糖具有很强的金属螯合能力，FeO/CS NPs 对 Pb(II)和 Cd(II)的吸附容量和吸附速率均优于纯 FeO。FeO/CS NPs 对 Pb(II)和 Cd(II)的最大吸附容量分别为 79.24 和 36.42mgg。此外，FeO/CS NPs 在经过五次吸附-解吸循环后表现出优异的可重复使用性。所有这些结果为连续制备可回收吸附剂提供了一种潜在的方法，在废水处理中有广阔的应用前景。
