Novel polysiloxane resin functionalized with dicyclohexano-18-crown-6 (DCH18C6): Synthesis, characterization and extraction of Sr(II) in high acidity HNO3 medium.
Novel polysiloxane resin functionalized with dicyclohexano-18-crown-6 (DCH18C6): Synthesis, characterization and extraction of Sr(II) in high acidity HNO3 medium.
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DOI：
10.1016/j.jhazmat.2012.04.020
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发表时间：
2012-07
影响因子：
13.6
通讯作者：
G. Ye;Feifei Bai;Jichao Wei;Jianchen Wang;J. Chen
中科院分区：
文献类型：
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作者：
G. Ye;Feifei Bai;Jichao Wei;Jianchen Wang;J. Chen
采用后处理方法合成了一种新型的二环己基-18-冠-6(DCH18C6)官能化聚硅氧烷树脂。首先合成了含氨基的DCH18C6基团，然后通过亲核取代反应在二氧化硅前驱体P-(CH2)3-Cl(其中P代表三维聚合二氧化硅基质)上进行了共价接枝反应，用29Si和13C固体核磁共振、FT-IR、XPS、TGA、ESEM和元素分析等手段系统地表征了官能化树脂的结构、热性能和表面形态。结果表明，DCH18C6配体与聚硅氧烷树脂成功键合，接枝率为33.6wt.%。由于有机硅骨架的坚固和配体的共价固定化，官能化树脂具有良好的热稳定性和耐酸性。批量实验表明，该树脂能有效地分离高酸度介质中的锶。在5.0mol/L硝酸溶液中，分配系数可达43.6cm~3/g。考察了HNO3的接触时间和酸度对树脂萃取性能的影响。考察了干扰离子对锶(II)离子的选择性和重复使用性。DCH18C6功能化树脂可用于高放废液中放射性锶的去除。
A novel kind of polysiloxane resin functionalized with dicyclohexano-18-crown-6 (DCH18C6) was synthesized through a post-modification approach. The DCH18C6 moieties bearing amino groups were firstly prepared, followed by covalent grafting to a silica precursor P-(CH2)3-Cl (Where P represents a 3-dimentional polymerized silica matrix) based on nucleophilic substitution reaction.29Si and13C solid-state NMR, FT-IR, XPS, TGA, ESEM and elemental analysis were employed to systematically characterize the structure, thermal property and surface morphology of the functionalized resin. The results indicated that the DCH18C6 ligands were successfully bonded to the polysiloxane resin with a satisfactory grafting degree (33.6wt.%). Due to the robust organosilica framework and the covalent immobilization of the ligands, the functionalized resin had excellent thermal stability and acid resistance. Batch experiments showed that the resin could effectively separate Sr(II) in high acidity mediums. The distribution coefficient (Kd) of 43.6cm3/g could be achieved in 5.0mol/L HNO3solution. The influences of contact time and acidity of HNO3on the resin's extraction performance were examined. The reusability and the selectivity to Sr(II) over interference ions were investigated. The DCH18C6-functionalized resin might be potentially applied for the radiostrontium removal in the high level liquid waste (HLLW).