硝酸
核化学
褐藻酸
水溶液中的金属离子
锶
造粒
金属
聚合物
钡
选择性
电子探针
离子交换
材料科学
离子
化学
无机化学
催化作用
矿物学
冶金
有机化学
复合材料
生物化学
作者
Yan Wu,Mohammad Outokesh,Hidenori Mimura,Yuichi Niibori
标识
DOI:10.1016/j.pnucene.2007.11.062
摘要
The granulation of TBP extractant is effective for the enhancement of uptake efficiency. The granulation was accomplished by microencapsulating techniques using alginate gel polymers (alginate and alginic acid gel polymers; calcium alginate, barium alginate and nitric alginate (CaALG, BaALG and HALG)). The characterization of hybrid microcapsules was examined by SEM/EPMA, and the uptake properties and the selectivity of various nuclides, Fe(III), Sr(II), Co(II), U(VI) and Pu(IV), were examined by batch methods. A relatively high uptake (%) of Fe(III), Sr(II) and Co(II) above 80% was obtained in the presence of 10−3 M HNO3, and the uptake equilibrium was attained within 5 h. The uptake rate of U(VI) and Pu(IV) attained equilibrium within 1 h and 3 h, respectively. At higher HNO3 concentration ranging from 10−3 M to 5 M, the uptake (%) of Fe(III), Sr(II) and Co(II) was considerably lowered. In contrast, the uptake (%) of U(VI) and Pu(IV) about 60% was obtained even in the presence of 5 M HNO3. The uptake of U(VI) for MCs (TBP–CaALG) was governed by the extraction with TBP micro droplets and ion-exchange reaction in the CaALG matrices. Energy dispersive spectra (EDS) showed that U(VI) ions were incorporated into both phases of TBP and CaALG in microcapsules.
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