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| Adsorption behavior of Th (IV) ion on a novel surface imprinting magnetic chitosan in aqueous solution |
| 1.Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for
National Defense, East China Institute of Technology, Nanchang, Jiangxi 330013, China; 2. School
of Chemical and Biomolecular Engineering, University of Sydney, Sydney NSW 2006, Australia |
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Abstract The performance of a novel surface imprinting magnetic chitosan (SIMC), which was
coated with magnetic fluids and crosslinked with epichlorohydrin and thorium ion as template
agent, was investigated for the adsorption of thorium(IV) in aqueous solution. Infrared spectra
and energy dispersive spectrometer before and after adsorption show that Th (IV) ion is
successfully adsorbed onto the SIMC. The influences of adsorbent dosage, pH value of solution
and contact time on the adsorption were discussed to obtain optimum process conditions.
Experimental equilibrium data were determined and correlated by both Freundlich and Langmuir
isotherms to calculate adsorption potential. The results show that the Langmuir isotherm model
fits the experimental data well with maximum Th (IV) adsorption capacity of 95.2 mg·g-1. Two
simplified models of pseudofirst order and pseudosecond order equation were used to fit the
adsorption processes. The experimental data for the adsorption kinetics correlates well with the
pseudosecond order equation. The adsorbed Th (IV) ions can be removed from the exhausted SIMC
effectively with 1 mol·L-1 sulfuric acid solution.
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Received: 15 January 2012
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2013, Vol. 34 
