期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 508, 期 -, 页码 303-312出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.08.068
关键词
Graphene oxide; Schiff base; Quaternary ammonium; Thorium; Uranium; Adsorption
资金
- National Natural Science Foundation of China [11475120]
- National Fund for Fostering Talents of Basic Science [J1210004]
- Doctor Research Foundation of Southwest University of Science and Technology [16zx7156]
A novel approach for facile covalent functionalization of graphene oxide (GO) was proposed in the present study in order to effectively avoid necessary anhydrous conditions and the usage of harsh reagents during the chemical functionalization of GO. Herein, a GO derivative that was functionalized with a primary amine derivative bearing a positively charged quaternary ammonium group, GO-S, was synthesized through a Schiff base condensation reaction between the amine groups of the primary amine derivative and the aldehyde groups of GO. The introduction of the quaternary ammonium groups can prevent GO from stacking and improve the dispersibility of GO after modification. The formation of imine bonds (-N=CH) between the primary amine and GO has been confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy. The GO-S demonstrated good dispersion stability in aqueous medium and also exhibited better adsorption performance than GO for Th(IV) and U(VI), with a maximum thorium adsorption capacity of 2.22 mmol/g and a maximum uranium adsorption capacity of 0.83 mmoli g, suggesting a great potential for the application of graphene oxide-based materials for facilitating the removal of Th(IV) and U(VI) from nuclear waste solutions. (C) 2017 Elsevier Inc. All rights reserved.
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