双功能离子液体萃取稀土动态界面性质及动力学规律的研究和应用

This project is designed to further advance the application of bifunctional ionic liquids extractants(Bif-ILEs) in green separation technique for rare earths (REs) based on the research of liquid-liquid extraction of REs with Bif-ILE. It will explore and solve the following problems：(1) Synthesis and screen Bif-ILEs with the great potential of industrial application and investigate the dynamical interfacial properties between ionic liquid and aqueous phase in the extraction process of REs (2)Under the guidance of interface parameters, to explore mass transfer regularities and kinetics mechanisms of REs in Bif-ILEs extraction systems; (3) Introduce the representative technology for REs recovery with Bif-ILE from REs secondary resources-the representative REs fluorescent lamp, optimize the extraction conditions and improve REs comprehensive utilization. This research start from the interaction between Bif-ILEs or REs at liquid/liquid dynamical interface. To discuss the major influence factors of REs mass transfer rates and extraction rates with Bif-ILEs and deduce the kinetics model, then to make reasonable analysis and scientific decision. This project provides theoretical basis and feasibility evaluation for the industrial applications of Bif-ILEs in REs separation process.

本项目在双功能离子液体液液萃取分离稀土的研究基础上，进一步推进双功能离子液体萃取剂在稀土绿色分离工艺中的应用，探索和解决下述几个问题：（1）合成并筛选具有工业应用前景的双功能离子液体，研究其在萃取稀土过程中离子液体/水相双相体系的动态界面性质；(2)在界面参数的指导下，探讨双功能离子液体萃取剂萃取稀土过程中的传质规律及动力学机理；（3）将具有代表性的双功能离子液体萃取剂引入以稀土节能荧光灯为代表的稀土二次资源回收新工艺中，优化萃取条件，提高稀土综合利用率。上述研究从分子离子相互作用的动态界面入手，从源头上探索影响双功能离子液体萃取稀土的传质速率及萃取率的主要因素，从而对双功能离子液体萃取稀土动力学模式做出合理分析和科学判定，为推广双功能离子液体在萃取分离领域的工业应用提供理论基础和可行性评估。

本项目在双功能离子液体液液萃取分离稀土的研究基础上，(1)合成并筛选了具有工业应用前景的双功能离子液体[A336][CA-12]，初步探索其在萃取稀土过程中传质规律及动力学机理，及离子液体/水相体系的动态界面性质，后续相关研究内容仍然在进行中；(2)合成双功能离子液体A336-1,3-二酮类离子液体萃取剂,研究其萃取稀土过程中热力机制和分离性能；（3）将具有代表性的一种双功能离子液体[P6, 6, 6, 14][P204]/[P6, 6, 6, 14][P507]萃取剂引入以稀土节能荧光灯为代表的稀土二次资源回收新工艺中，优化萃取条件，提高稀土综合利用率。（4）实验中进一步将回收的稀土离子用来制备Yb3+/Er3+/Gd3+共掺NaYF4上转换纳米材料，并对其发光性能进行研究，使研究课题向更广的领域进行延伸。