Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
J Hazard Mater. 2022 Oct 15;440:129735. doi: 10.1016/j.jhazmat.2022.129735. Epub 2022 Aug 8.
Uranium is an important fuel for nuclear power, with 4.5 billion tons of it stored in the oceans, 1,000 times more than on land. Polymer membrane materials are widely used in the marine resources fields, due to their convenient collection, good separation and can work continuously. Herein, a poly(amidoxime)-polyacrylonitrile blend membrane (PCP) with high flux, excellent antibacterial properties and uranium adsorption performance has been prepared by using the phase inversion method, and the prepared membrane was used for highly efficient uranium extraction from seawater. In static adsorption experiments, the PCP membrane reached adsorption equilibrium after 48 h, and the adsorption capacity was 303.89 mg/g (C =50 mg/L). In dynamic adsorption experiments, it was found that the lower flow rate and higher number of membrane layers were favorable for dynamic adsorption. In addition, the water flux of the PCP membrane was 7.4 times higher than that of the PAN membrane. The adsorption mechanism can be attributed to the chelation between amino and hydroxyl groups in CS, amidoxime group in poly(amidoxime) and uranyl ions. The simple preparation process coupled with the excellent adsorption performance indicated that the PCP membrane would be a promising material for the uranium extraction from seawater.
铀是核能的重要燃料，其在海洋中的储量为 45 亿吨，是陆地储量的 1000 倍。聚合物膜材料由于其方便的收集、良好的分离和可以连续工作，被广泛应用于海洋资源领域。本文采用相转化法制备了一种具有高通量、优异抗菌性能和铀吸附性能的聚（偕胺肟）-聚丙烯腈共混膜（PCP），并将其用于从海水中高效提取铀。在静态吸附实验中，PCP 膜在 48 小时后达到吸附平衡，吸附容量为 303.89mg/g（C=50mg/L）。在动态吸附实验中，发现较低的流速和较多的膜层数有利于动态吸附。此外，PCP 膜的水通量比 PAN 膜高 7.4 倍。吸附机理可以归因于壳聚糖中氨基和羟基、聚偕胺肟中偕胺肟基团与铀酰离子的螯合作用。简单的制备工艺结合优异的吸附性能表明，PCP 膜将是一种从海水中提取铀的有前途的材料。
