胍基抗菌型超高分子量聚乙烯纤维海水提铀吸附材料的制备及其性能

Preparation and properties of guanidine-based antimicrobial ultra-high molecular weight polyethylene fiber for uranium extraction from seawater

吸附纤维是最具经济性的海水提铀材料之一,海洋中的微生物易附着在吸附纤维上,严重影响纤维的吸附性能。本研究采用辐射诱导接枝聚合技术在超高分子量聚乙烯(UHMWPE)纤维上同时引入胍基和偕胺肟基,制备了一种新型抗菌海水提铀材料(UHMWPE-g-GEAO)。胍基的引入赋予纤维材料良好的抗生物污损能力,使其能够杀灭99.9%的大肠杆菌(E.coli)和金黄色葡萄球菌(S.aureus)。UHMWPE-g-GEAO纤维表现出较快的铀吸附速率和较高的吸附容量,在水溶液中的铀吸附容量可达到156.00 mg/g,14 d内在真实加标海水中的吸附容量达到1.39 mg/g。此外,经过5次吸附-脱附循环后,该材料仍能保持94.5%以上的吸附效率和96.2%以上的脱附效率,表现出良好的可重复使用性。本工作开发了一种可重复使用的UHMWPE抗菌吸附纤维,该纤维在海水提铀中具有良好的应用潜力。

Fiber absorbents are among the most economical materials for uranium extraction from seawater.Marine organisms are prone to fouling while being deployed in the sea,severely impairing the adsorption properties of the fiber.In this study,a novel antimicrobial adsorbent(UHMWPE-g-GEAO)was prepared by grafting guanidino and amidoxime groups onto ultra-high molecular weight polyethylene(UHMWPE)using radiation-induced graft polymerization technique.The guanidino groups endowed the fiber with excellent resistance to biofouling,enabling it to kill 99.9%of Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus).UHMWPE-g-GEAO fibers exhibited a fast uranium adsorption rate and high adsorption capacity,reaching 156.00 mg/g in aqueous solution and 1.39 mg/g in real seawater within 14 days.Additionally,the adsorbent exhibited superior reusability,preserving more than 94.5% of its adsorption efficiency and 96.2% of its desorption efficiency after five adsorption-desorption cycles.In this study,a reusable UHMWPE antimicrobial adsorbent fiber with promising potential for uranium extraction from seawater was developed.