Equilibrium and kinetic studies of selective adsorption and separation for strontium using DtBuCH18C6 loaded resin
Equilibrium and kinetic studies of selective adsorption and separation for strontium using DtBuCH18C6 loaded resin
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DOI：
10.1080/00223131.2012.660022
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发表时间：
2012-02
影响因子：
1.2
通讯作者：
Yan Wu;Seongyun Kim;D. Tozawa;T. Ito;T. Tada;K. Hitomi;E. Kuraoka;H. Yamazaki;K. Ishii
中科院分区：
文献类型：
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作者：
Yan Wu;Seongyun Kim;D. Tozawa;T. Ito;T. Tada;K. Hitomi;E. Kuraoka;H. Yamazaki;K. Ishii
将4′，4 ′（5″）-二（叔丁基环己基）-18-冠-6（DtBuCH 18 C6）及其分子改性剂1-十二醇浸渍固定在多孔SiO2/聚合物复合载体（SiO2-P颗粒）上，制备了冠醚负载树脂。采用热重分析、差热分析和电子探针等方法对DtBuCH 18 C6负载树脂进行了表征。采用间歇吸附法研究了Sr（II）、Cs（I）、Ru（III）、Pd（II）、La（III）、Nd（III）、Sm（III）、Gd（III）、Zr（IV）和Mo（VI）的吸附行为。此外，进行了Sr（II）的柱试验。通过改变振荡时间、HNO 3浓度和金属离子的初始浓度进行了批实验。在3 M HNO 3存在下，Sr（II）的Kd值大于182 cm 3/g。相反，Cs（I）、Ru（III）、Pd（II）、La（III）、Nd（III）、Sm（III）、Gd（III）、Zr（IV）和Mo（VI）的Kd值显著低于10 cm 3/g。Sr（II）的吸附受化学吸附机制控制，符合Langmuir型吸附方程。Sr（II）的穿透曲线呈S形，以水为淋洗剂，淋洗率可达99.9%。
A crown ether loaded resin was prepared by successive impregnation and fixing the 4′,4′(5″)-di(tert-butylcyclohexano)-18-crown-6 (DtBuCH18C6) and its molecule modifier, 1-dodecanol, onto the porous silica/polymer composite support (SiO2-P particles). The characterization of DtBuCH18C6 loaded resin was examined by thermal gravimetry and differential thermal analysis and electron probe microanalysis. The adsorption behavior of Sr(II), Cs(I), Ru(III), Pd(II), La(III), Nd(III), Sm(III), Gd(III), Zr(IV), and Mo(VI) was investigated by the batch method. Furthermore, the column test for Sr (II) was performed. The batch experiments were carried out by varying the shaking times, HNO3 concentration, and initial concentration of metal ions. A relatively large K d value above 182 cm3/g for Sr(II) was obtained in the presence of 3 M HNO3. In contrast, the K d values of Cs(I), Ru(III), Pd(II), La(III), Nd(III), Sm(III), Gd(III), Zr(IV), and Mo(VI) were considerably lower than 10 cm3/g. The adsorption of Sr(II) was found to be controlled by chemisorption mechanism, and followed a Langmuir-type adsorption equation. The breakthrough curve of Sr(II) had S-shaped profile, and the elution percentage was estimated to be 99.9% by using the eluent of H2O.