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

Yating ZHANG; Yinyong AO; Xuemei LIU; Yan ZHAO; Hongtao SONG; Bo LIU; Wei HUANG

doi:10.11889/j.1000-3436.2018.rrj.36.050303

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

RADIATION CHEMISTRY | 更新时间：2021-12-10

- Preparation and characterization of polyvinylidene difluoride microsphere grafted by benzo-15-crown-5 for lithium isotope separation
- Journal of Radiation Research and Radiation Processing Vol. 36, Issue 5, (2018)
- 作者机构：
  
  1.中国工程物理研究院核物理与化学研究所绵阳 621900
- 作者简介：
- 基金信息：
  
  "NSAF" joint fund(U1430234)
- DOI：10.11889/j.1000-3436.2018.rrj.36.050303
  CLC：
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Yating ZHANG, Yinyong AO, Xuemei LIU, et al. Preparation and characterization of polyvinylidene difluoride microsphere grafted by benzo-15-crown-5 for lithium isotope separation. [J]. Journal of Radiation Research and Radiation Processing 36(5):050303-6(2018)
DOI：

Yating ZHANG, Yinyong AO, Xuemei LIU, et al. Preparation and characterization of polyvinylidene difluoride microsphere grafted by benzo-15-crown-5 for lithium isotope separation. [J]. Journal of Radiation Research and Radiation Processing 36(5):050303-6(2018) DOI： 10.11889/j.1000-3436.2018.rrj.36.050303.

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1.2 mmol/g，微球对锂离子的吸附平衡时间为20 h；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。

Abstract

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 CH,3,COOLi 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

Keywords

Benzo-15-crown-5Lithium isotope separationPre-irradiation emulsion graftingSolid-liquid extraction

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