Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, PR China; College of Material Science and Chemical Engineering, Harbin Engineering University, 150001, PR China.
College of Material Science and Chemical Engineering, Harbin Engineering University, 150001, PR China.
Chemosphere. 2021 May;271:129548. doi: 10.1016/j.chemosphere.2021.129548. Epub 2021 Jan 4.
In this study, a swelling layer was constructed on the surface of the nano-polyacrylonitrile (PAN) fiber fabric prepared by electrospinning to enrich uranium (U (VI)) adsorption from seawater. The constructed swelling layer composes of a polyethyleneimine (PEI) containing a huge amount of amino groups and imino groups with strong hydrophilicity. The molecular chain swelled in an aqueous solution by forming a swelling layer on the PAN surface. In addition, p-aminobenzenesulfonic acid (SA) was used as the side chain end group grafted on the PAN surface, the benzene ring as the side chain can hinder the rotation of the PEI chain, thereby increasing the rigidity. The increasing of the rigidity leads to stretch the conformation of the PEI molecular chain, increasing the probability of collision with U (VI), which is beneficial for adsorption. The adsorption capacity of the prepared adsorbent in the adsorption experiment reached 215.25 mg g, and the adsorption capacity in the 8 ppm spiked simulated seawater reached 144.5 mg g. The adsorption mechanism of U (VI) was analyzed by XPS. The sulfonic acid group in SA as the terminal group and amino group in the swelling layer formed a coordination structure with U (VI). The swelling layer constructed on the surface of polyacrylonitrile fibers is used to effectively extract uranium from seawater.
在这项研究中，通过静电纺丝制备的纳米聚丙烯腈 (PAN) 纤维织物表面构建了一个溶胀层，以从海水中富集铀 (U(VI))。构建的溶胀层由含有大量氨基和亚氨基的聚乙烯亚胺 (PEI) 组成，具有很强的亲水性。分子链在水溶液中溶胀，在 PAN 表面形成溶胀层。此外，对氨基苯磺酸 (SA) 被用作接枝在 PAN 表面的侧链端基，苯环作为侧链可以阻碍 PEI 链的旋转，从而增加刚性。刚性的增加导致 PEI 分子链的构象伸展，增加与 U(VI)碰撞的概率，有利于吸附。在吸附实验中，制备的吸附剂的吸附容量达到 215.25mg g，在 8ppm 加标模拟海水中的吸附容量达到 144.5mg g。通过 XPS 分析了 U(VI)的吸附机理。SA 中的磺酸基作为端基和溶胀层中的氨基与 U(VI)形成配位结构。在聚丙烯腈纤维表面构建的溶胀层可有效从海水中提取铀。
