苯并15-冠-5醚接枝壳聚糖薄膜分离锂同位素性能研究

发布时间：2018-04-02 19:25

  本文选题：锂同位素分离　切入点：　出处：《高分子学报》2017年12期

【摘要】：以壳聚糖与4'-甲酰基苯并-15-冠-5醚为原料,通过希夫碱反应制备了苯并-15-冠-5醚接枝壳聚糖薄膜,采用固-液萃取法研究薄膜吸附锂离子动力学和热力学行为,及其锂同位素吸附分离性能.结果表明:冠醚接枝壳聚糖薄膜对锂离子的吸附过程更加适合于准二级动力学方程和Langmuir吸附等温模型,薄膜对锂离子的吸附是一个由化学吸附控制的单层表面吸附,是一个自发进行的放热过程.此外以水-碘化锂/冠醚接枝壳聚糖薄膜(冠醚固载量为2.98 mmol/g)作为萃取体系,其单级分离因子高达1.053(10oC).且轻同位素6Li富集于薄膜相,重同位素7Li富集于液相.
[Abstract]:Chitosan films grafted with benzo-15-crown-5 ethers were prepared by the Schiff base reaction of chitosan with 4L-formylbenzo-15-crown-5 ethers. The kinetics and thermodynamic behavior of adsorbed lithium ions in the films were studied by solid-liquid extraction method.And its adsorption and separation properties of lithium isotopes.The results show that the adsorption process of lithium ion on chitosan film is more suitable for the quasi-second-order kinetic equation and Langmuir adsorption isotherm model. The adsorption of lithium ion on the film is a monolayer surface adsorption controlled by chemisorption.It is a spontaneous exothermic process.In addition, using water-lithium iodide / crown ether grafted chitosan film (crown ether immobilization capacity of 2.98 mmol / g) as extraction system, the single-stage separation factor was as high as 1.053 ~ 10oC ~ (-1).The light isotope 6Li is enriched in the thin film phase, and the heavy isotope 7Li is enriched in the liquid phase.
【作者单位】： 天津工业大学分离膜与膜过程国家重点实验室/分离膜科学与技术国家级国际合作研究中心;天津工业大学材料科学与工程学院;天津工业大学环境与化学工程学院;
【基金】：国家自然科学基金(基金号51303130,21376176) 长江学者和创新团队发展计划(项目号IRT13084)资助
【分类号】：TQ051.893
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本文编号：1701774