Adsorption Property of Cesium onto Modified Macroporous Silica鈥揅alix[4]arene-crown Based Supramolecular Recognition Materials

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• 作者：Anyun Zhang ; Zhifang Chai
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：May 2, 2012
• 年：2012
• 卷：51
• 期：17
• 页码：6196-6204
• 全文大小：465K
• 年卷期：v.51,no.17(May 2, 2012)
• ISSN：1520-5045

文摘

The adsorption behavior of Cs(I), one of the heat generators, in HNO₃ medium was investigated at 298 K. The impact of U(VI), some typical elements, and temperature on the adsorption of Cs(I) was evaluated. It was performed by macroporous silica-based 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) impregnated supramolecular recognition materials (Calix[4] + M)/SiO₂鈥揚. They were modified with tri-n-butyl phosphate (TBP), octanol (Oct), and methyloctyl-2-dimethylbutanemide (MODB). The excellent adsorption ability and high selectivity of (Calix[4] + M)/SiO₂鈥揚 for Cs(I) except Rb(I) and U(VI) were confirmed. The adsorption ability of Cs(I) onto the modified supramolecular recognition materials was (Calix[4] + Oct)/SiO₂鈥揚 > (Calix[4] + TBP)/SiO₂鈥揚 > (Calix[4] + MODB)/SiO₂鈥揚. The chromatographic separation of Cs(I) from a 4.0 M HNO₃ solution containing La(III), Sr(II), Ru(III), Cs(I), Rb(I), U(VI), Mo(VI), Zr(IV), Gd(III), and Pd(II) was carried out with a (Calix[4] + TBP)/SiO₂鈥揚 packed column. Cs(I) was eluted effectively with water. The possibility and feasibility of effective partitioning of Cs(I) from highly active liquid waste by the (Calix[4] + M)/SiO₂鈥揚 materials was evaluated.