Synthesis of ketoxime-functionalized Fe3O4@C core–shell magnetic microspheres for enhanced uranium(VI) removal

Qi Liu; Wenting Li; Wei Zhao; Lichao Tan; Xiaoyan Jing; Jingyuan Liu; Dalei Song; Hongsen Zhang; Rumin Li; Lianhe Liu; Jun Wang

doi:10.1039/C5RA22758E

Synthesis of ketoxime-functionalized Fe₃O₄@C core–shell magnetic microspheres for enhanced uranium(vi) removal

Qi Liu,^a Wenting Li,^a Wei Zhao,^c Lichao Tan,^ad Xiaoyan Jing,^a Jingyuan Liu,^a Dalei Song,^a Hongsen Zhang,^a Rumin Li,*^a Lianhe Liu^b and Jun Wang*^ab

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* Corresponding authors

^a Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
E-mail: zhqw1888@sohu.com
Fax: +86 451 8253 3026
Tel: +86 451 8253 3026

^b Institute of Advanced Marine Materials, Harbin Engineering University, China

^c Institute of Scientific and Technical Information of Heilongjiang Province, Harbin 150028, China

^d Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China

Abstract

Ketoxime-functionalized carbon coated iron oxide (Fe₃O₄@C–KO) was synthesized and characterized by transmission electron microscopy, X-ray diffraction, Fourier transformed infrared spectroscopy, and magnetic measurements. The essential factors affecting uranium(VI) adsorption from an aqueous solution of Fe₃O₄@C–KO, such as initial pH, contact time and temperature, were investigated. The adsorption is highly dependent on solution pH. Analysis of the experimental data using sorption kinetic models, reveal that the process follows a pseudo-second-order kinetic model. In addition, adsorption isotherms and thermodynamics were investigated. The adsorption of uranium(VI) from an aqueous solution onto Fe₃O₄@C–KO was fitted to Langmuir and Freundlich adsorption isotherms. The adsorption of uranium(VI) is well-described by the Langmuir isotherm. Thermodynamic parameters further show that the sorption is an endothermic and spontaneous process. Fe₃O₄@C–KO is a powerful and promising sorbent for the efficient removal of uranium(VI) from aqueous solutions.

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Synthesis of ketoxime-functionalized Fe₃O₄@C core–shell magnetic microspheres for enhanced uranium(vi) removal

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Synthesis of ketoxime-functionalized Fe₃O₄@C core–shell magnetic microspheres for enhanced uranium(VI) removal

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