冠醚功能化聚偏氟乙烯微球的制备及其锂同位素分离性能  

Preparation and characterization of polyvinylidene difluoride microsphere grafted by benzo-15-crown-5 for lithium isotope separation

作　　者：张雅婷 敖银勇[1] 刘雪梅[1] 赵岩[1] 宋宏涛[1] 刘波[1] 黄玮[1] ZHANG Yating;AO Yinyong;LIU Xuemei;ZHAO Yan;SONG Hongtao;LIU Bo;HUANG Wei(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《辐射研究与辐射工艺学报》2018年第5期33-38,共6页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金项目(No.U1430234)资助~~

摘　　要：通过预辐射乳液接枝法制备了一种以聚偏氟乙烯(Polyvinylidene difluoride, PVDF)为载体,固载苯并15冠5(B15C5)螯合剂的功能微球。利用傅里叶红外光谱分析、元素分析、扫描电镜等手段表征微球的结构形貌,并研究其对锂同位素的吸附分离性能。结果表明:功能化后微球上冠醚的固载量可达1.2mmol/g,微球对锂离子的吸附平衡时间为20h;微球对阴离子软度较高的锂盐具有更好的吸附效果:在常温、中性溶液中对硫氰酸锂中Li^+的吸附容量最高,约为4.50 mg/g;微球对醋酸锂的同位素分离因子可达1.05±0.02。Polyvinylidene difluoride （PVDF） microspheres functionalized with aminobenzo- 15-crown-5 （PGB5） were prepared via pre-irradiation emulsion grafting polymerization of glycidyl methacrylate. The chemical structure and performance in lithium isotope separation of the PGB5 microspheres were characterized by Fourier-transform infrared （FT-IR） spectroscopy, elemental analysis, and scanning electron microscopy （SEM）. The loading capacity of aminobenzo-15-crown-5 was -1.2 mmol/g. The equilibrium adsorption time of PGB5 microspheres for Li＋ in aqueous solutions was about 20 h. Moreover, Li＋ is more easy to adsorb if the counter anion is softer. Under optimized condition, i.e., 25 ℃ and pH=7, the maximum adsorption capacity for Li＋reached 4.50 mg/g in a LiSCN solution, and the maximum isotope separation factor reached 1.05＋0.02 in a CH3COOLi solution.

关 键 词：苯并15冠5 锂同位素分离 预辐射乳液接枝 固液萃取 

分 类 号：TL13[核科学技术—核能科学]