Amidoxime compounds have been widely used in metal separation and recovery because of their excellent chelating properties to metal ions, especially to uranium (VI). In this study, N, N-bis (2-hydroxyethyl) malonamide was obtained from ethanolamine and dimethyl malonate, and used to prepare a two-dimensional network polymer, then the obtained polymer was immobilized in an environmentally friendly chitosan biomembrane, which enhanced its stability and hydrophobicity, meanwhile the amidoxime functionalization was achieved by oximation reaction of bromoacetonitrile, the application of the material further extends to uranium (VI) separation in solutions. Due to the synergistic action of amide group and amidoxime group, poly (ethanolamine-malonamide) based amidoxime biomembranes (PEA-AOM) showed extraordinary adsorption effect on uranium (VI), among which the saturation adsorption capacity of PEA-AOM-2 was 748.64 mg/g. PEA-AOM-2 also had good reusability (following five cycles of adsorption-desorption, the recovery rate maintained at 88%) and selectivity for uranium (VI), showing satisfactory results in competitive ion coexistence system and simulated seawater experiments. This study demonstrated that PEA-AOM-2 provided a new option for uranium (VI) separation in complex environment and low-concentration uranium background.

偕胺肟类化合物因其对金属离子，特别是铀（VI）具有优异的螯合性能而广泛应用于金属分离和回收。本研究以乙醇胺和丙二酸二甲酯为原料，制备了N,N-双(2-羟乙基)丙二酰胺，并用于制备二维网络聚合物，然后将所得聚合物固定在环保的壳聚糖生物膜中，增强了其稳定性和疏水性，同时通过溴乙腈的肟化反应实现偕胺肟功能化，该材料的应用进一步扩展到溶液中铀（VI）的分离。由于酰胺基团和偕胺肟基团的协同作用，聚乙醇胺-丙二酰胺基偕胺肟生物膜（PEA-AOM）对铀（VI）表现出非凡的吸附效果，其中PEA-AOM-2的饱和吸附容量为748.64毫克/克。PEA-AOM-2还具有良好的可重复使用性（经过5次吸附-解吸循环，回收率保持在88%）和对铀（VI）的选择性，在竞争离子共存体系和模拟海水实验中显示出令人满意的结果。该研究表明，PEA-AOM-2为复杂环境和低浓度铀背景下的铀（VI）分离提供了新的选择。