Adsorption of thorium(IV) on magnetic multi-walled carbon nanotubes

The influences of pH, contact time, solid-liquid ratio, temperature and C 60 (C(COOH) 2 ) n on Th(IV) adsorption onto the magnetic multi-walled carbon nanotubes (MMWCNTs) were studied by batch technique. The dynamic process showed that the adsorption of Th(IV) onto MMWCNTs could reach equilibrium in...

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Bibliographic Details
Published in:Science China. Chemistry 2014-11, Vol.57 (11), p.1483-1490
Main Authors: Liu, Peng, Qi, Wei, Du, YaoFang, Li, Zhan, Wang, Jing, Bi, JuanJuan, Wu, WangSuo
Format: Article
Language:English
Subjects:
Adsorption
Buckminsterfullerene
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Endothermic reactions
Multi wall carbon nanotubes
Thorium
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Summary:The influences of pH, contact time, solid-liquid ratio, temperature and C 60 (C(COOH) 2 ) n on Th(IV) adsorption onto the magnetic multi-walled carbon nanotubes (MMWCNTs) were studied by batch technique. The dynamic process showed that the adsorption of Th(IV) onto MMWCNTs could reach equilibrium in 40 h and matched the pseudo-second-order kinetics model. The adsorption of Th(IV) onto MMWCNTs was significantly dependent on pH values, the adsorption ratio increased markedly at pH 3.0–5.0, and then maintained a steady state as pH values increased. At low pH, different C 60 (C(COOH) 2 ) n content could enhance the adsorption content of Th(IV) onto MMWCNTs, but restrained it at higher pH. Through simulating the adsorption isotherms by Langmuir, Freundlich and Dubini-Radushkevich models, it could be seen respectively that the adsorption pattern of Th(IV) onto MMWCNTs was mainly surface complexation, and that the adsorption process was endothermic and irreversible.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-014-5204-x