Journal
CARBOHYDRATE POLYMERS
Volume 121, Issue -, Pages 79-85Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.12.024
Keywords
Chitosan; Uranium; Polyacrylonitrile; Amidoxime; Response surface methodology (RSM)
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Funding
- Special Fund for Agro-scientific Research in the Public Interest [201103007]
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The amidoximated chitosan-grafted polyacrylonitrile (CTS-g-PAO) was prepared for the adsorption of uranium from water. The effects of pH, concentration of uranium and the solid liquid ratio on the adsorption of uranium by CTS-g-PAO were optimized using Doehlert design of response surface methodology (RSM). The adsorption capacity and removal efficiency achieved 312.06 mg/g and 86.02%, respectively. The adsorption process attained equilibrium only in 120 min. More than 80% of the absorbed uranium could be desorbed by 0.1 mol/l HCl or EDTA-Na, and CTS-g-PAO could be reused at least 3 times. The CTSg-PAO and U(VI) ions formed a chelate complex due to FTIR spectral analysis. The surface morphology of CTS-g-PAO was also investigated by SEM. The adsorption process was better described by Langmuir isotherm and pseudo second order kinetic model. Results obtained indicated that CTS-g-PAO was very promising in adsorption of uranium from water. (C) 2014 Elsevier Ltd. All rights reserved.
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