载银磷酸基功能化铁树叶纤维吸附海水中铀的性能及机理研究OA

The uranium reserve in seawater is approximately 1,000 times that of terrestrial reserves.Therefore,the extraction of uranium from seawater is of great strategic signifi-cance for the sustainable development of nuclear energy in China.Plant fibers,owing to their abundant sources and biodegradability,have emerged as one of the most cost-effective materials for uranium extraction from seawater.However,biofouling remains a major challenge in this process.Therefore,this study extracted plant fibers from Cycas leaves,modified them with phosphate via an impregnation-curing method,and subsequently prepared silver-loaded phosphate-functionalized Cycas leaf fibers(Ag@P-CLF)through in-situ reduction.The uranium adsorption performance,antibacterial properties,and reus-ability of the material were systematically investigated.The results show that under condi-tions of pH=5.0 and an initial uranium concentration of 5 mg/L,the adsorption capacity of 0.2 g/L Ag@P-CLF for U(Ⅵ)is 23.48 mg/g,with an adsorption selectivity parameter Kd(U(Ⅵ))of 1 317.2 g/L.In simulated seawater with pH=8.15 and an initial u-ranium concentration of 5 mg/L,the adsorption capacity still reaches 23.45 mg/g.Mean-while,the inhibition zone diameters of the material against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)are(9.75±0.3)mm and(10.75±0.25)mm,re-spectively.After five adsorption-desorption cycles,the adsorption and desorption efficien-cies of Ag@P-CLF for U(Ⅵ)remain at 80%and 89%,respectively.This study provides a novel adsorbent material with both excellent adsorption performance and antibacterial properties for uranium extraction from seawater.