期刊
CHEMICAL ENGINEERING JOURNAL
卷 259, 期 -, 页码 752-760出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.08.015
关键词
Uranium (VI); Graphene; Layered double hydroxides; Adsorption
资金
- National Natural Science Foundation of China [21353003]
- Special Innovation Talents of Harbin Science and Technology [2013RFQXJ145]
- Fundamental Research Funds of the Central University (HEUCFZ)
- Natural Science Foundation of Heilongjiang Province [B201316]
- Program of International S&T Cooperation special project [2013DFA50480]
- fund for Transformation of Scientific and Technological Achievements of Harbin [2013DB4BG011]
- Research and Development of Industrial Technology Project of Jilin Province [JF2012C022-4]
This study presents a facile route for the fabrication of a hierarchical three-dimensional composite (layered double hydroxide/graphene). The composite was obtained via in situ growth of layered double hydroxide (LDH) nanosheet arrays onto graphene sheets. The materials were characterized by transmission electron microscopy, scanning electron microscope, Fourier-transform infrared spectroscopy, X-ray diffraction and Brunauer-Emmett-Teller surface area measurement. This particularly structured composite has a large specific surface area and typical mesoporous characteristics, which are favorable for achieving high adsorption performance. The influence of conditions for uranium adsorption, including pH of aqueous solution, adsorbent dose, shaking time, and temperature were investigated. The results reveal that the maximum adsorption capacity of the layered double hydroxide/graphene toward uranium (VI) is 277.80 mg g(-1), displaying a high efficiency for the removal of uranium (VI) from aqueous solution. The thermodynamic parameters, such as Delta H degrees, Delta S degrees, and Delta G degrees show that the process is endothermic and spontaneous. The kinetic adsorption can be described by a pseudo-second-order rate equation. This work describes an efficient, fast, and convenient approach for the removal of uranium (VI) from aqueous solutions. (C) 2014 Elsevier B.V. All rights reserved.
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