期刊
CHEMICAL ENGINEERING JOURNAL
卷 198, 期 -, 页码 246-253出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.05.112
关键词
Ordered mesoporous carbon; Selective adsorption; U(VI); Wet oxidation
资金
- National Natural Science Foundation of China [21101024]
- Key Project of Chinese Ministry of Education [211086]
- Project of Jiangxi Provincial Department of Education [GJJ10493, GJJ11139]
- China Postdoctoral Science Foundation [20110490857]
- Natural Science Foundation of Jiangxi Province [2010GQH0015]
- Open Project Foundation of the Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense of China [2010RGET08]
The mesoporous carbons (CMK-3) were functionalized with carboxyl group using sulfuric acid solution of ammonium persulfate (APS). The oxidized product (CMK-3-COOH) and CMK-3 were characterized by the small angle XRD, N-2 adsorption-desorption and FT-IR, and the results indicated the mesoporous and ordered structure of products did not change obviously after oxidation. The adsorption capacities for U(VI) from aqueous solution of CMK-3-COOH and CMK-3 were compared. The essential factors affected U(VI) adsorption such as initial pH, contact time and initial U(VI) concentration were investigated. In addition, the adsorption isotherm, kinetics and thermodynamics were investigated. The adsorption of U(VI) could be well-described by Langmuir, Freundlich isotherms and pseudo-second kinetic models. The monolayer adsorption maximum capacity of CMK-3-COOH and CMK-3 at 25 degrees C were 250.0 mg g(-1) and 178.6 mg g(-1). respectively, which indicate the adsorption capacity was improved by oxidation. The thermodynamic parameters (Delta H, Delta S and Delta G) showed the U(VI) adsorption on CMK-3-COOH and CMK-3 were all endothermic and spontaneous nature, respectively. Selective adsorption studies show that the CMK-3-COOH can selectively remove of U(VI), and the selectivity coefficients of mesoporous carbon were improved after oxidation in the presence of co-existing ions, Na(I), Ni(II), Sr(II), Mn(II), Mg(II) and Zn(II). Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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