Easily prepared and stable functionalized magnetic ordered mesoporous silica for efficient uranium extraction

作     者：Wenlu Guo Changming Nie Lin Wang Zijie Li Lin Zhu Liuzheng Zhu Zhentai Zhu Weiqun Shi Liyong Yuan 

作者机构：School of Chemistry and Chemical EngineeringUniversity of South ChinaHengyang 421001China Laboratory of Nuclear Energy ChemistryInstitute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China State Key Laboratory of NBC Protection for CivilianBeijing 102205China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2016年第59卷第5期

页      面：629-636页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China (11275219, 11275090, U1432103) the “Strategic Priority Research program” of the Chinese Academy of Sciences (XDA030104) the State Key Laboratory of NBC Protection for Civilian (SKLNB201412) the Scientific Research Fund of Hunan Provincial Education Department (12A116) 

主　　题：aminopropyls magnetic ordered mesoporous silica uranium sorption 

摘      要：Functionalized magnetic Fe_3O_4@SiO_2 composite nanoparticles were prepared by simply embedding iron oxide nanoparticles into MCM-41 through one-step synthesis process, followed by aminopropyls grafting on the mesopore channels, aiming to efficiently and conveniently uptake U(VI) from aqueous solution. The resultant material possesses highly ordered mesoporous structure with large surface area, uniform pore size, excellent thermal stability, quick magnetic response, and desirable acids resistance, confirmed by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), N_2 adsorption/desorption experiments, powder X-ray diffraction(PXRD), and thermogravimetric analysis(TGA). Detailed U(VI) sorption test indicated that this material is indeed an effective U(VI) sorbent with fast sorption kinetics of less than 2 h, large sorption capacity of 160 mg/g at p H 5.0±0.1, and desirable selectivity towards U(VI) ions over a range of competing metal ions. The absorbed U(VI) can be easily desorbed by 0.01 mol/L or more concentrated HNO_3 solution, and the reclaimed sorbent can be reused with no obvious decrease of sorption capacity even after 4 sorption-desorption cycles. The present results suggest the vast opportunities of this kind of magnetic composite on the solid-phase extraction of U(VI).