Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies
Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies
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使用负载混合大环化合物的吸附剂同时分离和回收 Cs(I) 和 Sr(II)。
DOI：
10.1080/00223131.2016.1175979
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发表时间：
2016-05
影响因子：
1.2
通讯作者：
Wei Yuezhou
中科院分区：
文献类型：
--
作者：
Wu Yan;Zhang XiaoXia;Kim Seong-Yun;Wei Yuezhou
本文研究了硅基复合吸附剂同时从硝酸溶液中分离回收Cs(I)和Sr(II)的方法。将两种超分子识别剂1，3-[(2，4-diethylheptylethoxy)oxy]-2，4-crown-6-Calix[4]-arene(Calix[4]arene-R14)和4‘，4’(5“)-二(叔丁基环己基)-18-冠-6先后浸渍和固定在硅基聚合物载体(SiO_2-P)上，制备了吸附剂。然后对Cs(I)和Sr(II)的吸附特性、表征、平衡动力学和动态吸附特性进行了评价。在298K时，用3M HNO3对Cs(I)和Sr(II)的分配系数(Kd)均大于102cm3/g，且Kd值随温度的升高而减小。吸附动力学和平衡研究分别符合准二级模型和Redlich-Peterson等温线模型。加入10−3∼4 M硝酸后，水相总有机碳值保持不变。动态吸附/洗脱实验结果表明，即使在1.5cm3/min的流速下，Cs(I)和Sr(II)也能被有效地同时捕获和洗脱。
ABSTRACT In this study, simultaneous separation and recovery of Cs(I) and Sr(II) from nitric acid solution was investigated using a silica-based hybrid adsorbent. The adsorbent was prepared by successive impregnation and fixing of two supramolecular recognition agents namely, 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix[4]-arene(Calix[4]arene-R14) and 4',4' (5")-di(tert-butylcyclohexano)-18-crown-6, onto a silica-based polymer support(SiO2-P). Uptake properties, characterization, equilibrium kinetics, and dynamic adsorption properties of Cs(I) and Sr(II) were then assessed. Distribution coefficients (Kd) higher than 102 cm3/g for Cs(I) and Sr(II) were obtained using 3 M HNO3 at 298 K, and the Kd values decreased with increasing temperature. Adsorption kinetics and equilibrium studies fitted well with pseudo-second-order model and Redlich–Peterson isotherm model, respectively. The constant total organic carbon values in the aqueous phase were obtained after adding 10−3 ∼ 4 M HNO3. Results of the dynamic adsorption/elution test indicated that Cs(I) and Sr(II) were efficiently and simultaneously captured and eluted even under a flow rate of 1.5 cm3/min.
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影响因子：
1.5
作者：
Wei, Y;Kumagai, M;Odoj, R
通讯作者：
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影响因子：
8.6
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通讯作者：
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影响因子：
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作者：
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