Magnetic solid-phase extraction of strontium using core–shell structured magnetic microspheres impregnated with crown ether receptors: a response surface optimization
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- 作者：Rong Yi ; Gang Ye ; Fengcheng Wu ; Dachao Lv…
- 关键词：Strontium ; Crown ether ; Magnetic microspheres ; Magnetic solid ; phase extraction (MSPE) ; Response surface methodology (RSM)
- 刊名：Journal of Radioanalytical and Nuclear Chemistry
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：308
- 期：2
- 页码：599-608
- 全文大小：1,420 KB
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Gang Ye (1) (2)
Fengcheng Wu (1)
Dachao Lv (1)
Jing Chen (1) (2)
1. Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China
2. Beijing Key Lab of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Nuclear Chemistry
Physical Chemistry
Nuclear Physics, Heavy Ions and Hadrons
Diagnostic Radiology
Inorganic Chemistry - 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
- ISSN：1588-2780
文摘
A new kind of core–shell structured magnetic microspheres impregnated with di-tert-butyl cyclohexano-18-crown-6 (DtBuCH18C6) receptors in the encapsulation layer was developed in this study, and was utilized for selective removal of strontium in strong HNO3 solutions via magnetic solid-phase extraction (MSPE). The magnetic microspheres, labelled as Fe3O4@SiO2@DtBuCH18C6, exhibited good magnetism (M s = 52.2 emu g−1), fast response under applied magnetic field and easy redispersion ability due to the superparamagnetic nature. Adsorption behaviors and mechanism were comprehensively studied, showing that the adsorption of Sr(II) by Fe3O4@SiO2@DtBuCH18C6 was most likely to be a monolayer chemisorption process via forming complexation between the crown ether receptors and Sr(II) (i.e. Langmuir model). More importantly, central composite design based on response surface methodology was utilized for optimizing the operational conditions of the adsorption process. A quadratic model was obtained to describe the relationship between adsorption capacity and the independent factors such as initial Sr(II) concentration, HNO3 concentration etc. The simulated model well predicted the optimum HNO3 concentration (~1.7 mol L−1) to achieve the best Sr(II) adsorption capacity. On this basis, a conceptual MSPE process was proposed for an effective separation of strontium in simulated high level liquid wastes.