In this study, a novel kind of amidoxime calixarene fiber (ACF) was prepared for the first time, which was used for the adsorption of hexavalent uranium (U (VI)). The ACF was prepared by three steps, including Michael addition reaction to prepare cyano-calixarene, amidoxime reaction to prepare amidoxime calixarene, and electrospinning of ACF. The ACF was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA). These results indicated that the ACF was successfully prepared. The fibers had uniform diameter and rough surface morphology, and amidoxime was evenly distributed on the fibers surface. The comprehensive effect of pH value on Zeta potential and adsorption capacity of U (VI) was analyzed, and the adsorption kinetic and isotherm were also studied. The results showed that the solution with pH value of 7 was most suitable for the adsorption of U (VI) at 25 °C. The equilibrium adsorption capacity of ACF was 101.2 mg/g at 240 min, which maintained the desorption of 64% after five cycles. The adsorption behavior of ACF fitted the pseudo-second-order adsorption kinetic model and Langmuir adsorption isotherm model. And the intra-particle diffusion was not the only adsorption controlling mechanism during adsorption process. These results indicated that the adsorption mechanism of ACF was mainly attributed to monolayer chemical adsorption and secondary to physical adsorption. This research provides a new strategy for development the high-efficient adsorbent for uranium.

本研究首次制备了一种新型偕胺肟杯芳烃纤维（ACF），用于吸附六价铀（U（VI））。ACF的制备分为三个步骤，包括制备氰基杯芳烃的迈克尔加成反应、制备偕胺肟杯芳烃的偕胺肟反应和ACF的静电纺丝。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）、热重分析（TGA）对ACF进行表征。这些结果表明 ACF 制备成功。纤维直径均匀，表面形貌粗糙，偕胺肟均匀分布在纤维表面。分析了pH值对Zeta电位和U(VI)吸附能力的综合影响，并研究了吸附动力学和等温线。结果表明，pH值为7的溶液在25℃时最适合吸附U(VI)。ACF在240 min时的平衡吸附量为101.2 mg/g，5次循环后仍保持64%的解吸率。ACF的吸附行为符合准二级吸附动力学模型和Langmuir吸附等温线模型。并且颗粒内扩散不是吸附过程中唯一的吸附控制机制。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。结果表明，pH值为7的溶液在25℃时最适合吸附U(VI)。ACF在240 min时的平衡吸附量为101.2 mg/g，5次循环后仍保持64%的解吸率。ACF的吸附行为符合准二级吸附动力学模型和Langmuir吸附等温线模型。并且颗粒内扩散不是吸附过程中唯一的吸附控制机制。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。结果表明，pH值为7的溶液在25℃时最适合吸附U(VI)。ACF在240 min时的平衡吸附量为101.2 mg/g，5次循环后仍保持64%的解吸率。ACF的吸附行为符合准二级吸附动力学模型和Langmuir吸附等温线模型。并且颗粒内扩散不是吸附过程中唯一的吸附控制机制。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。5个循环后保持64%的解吸。ACF的吸附行为符合准二级吸附动力学模型和Langmuir吸附等温线模型。并且颗粒内扩散不是吸附过程中唯一的吸附控制机制。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。5个循环后保持64%的解吸。ACF的吸附行为符合准二级吸附动力学模型和Langmuir吸附等温线模型。并且颗粒内扩散不是吸附过程中唯一的吸附控制机制。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。这些结果表明，ACF的吸附机理主要归因于单层化学吸附，其次是物理吸附。该研究为开发高效铀吸附剂提供了新的策略。