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Removal of Uranium from Aqueous Solution by Alginate Beads
Jing Yu,Jianlong Wang,Yizhou Jiang 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
The adsorption of uranium (VI) by calcium alginate beads was examined by batch experiments. The effects of environmental conditions on U (VI) adsorption were studied,including contact time, pH, initial concentration of U (VI), and temperature. The alginatebeads were characterized by using scanning electron microscopy, transmission electronmicroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Fourier transform infrared spectra indicated that hydroxyl and alkoxy groups arepresent at the surface of the beads. The experimental results showed that the adsorption ofU (VI) by alginate beads was strongly dependent on pH, the adsorption increased at pH 3~7,then decreased at pH 7~9. The adsorption reached equilibrium within 2 minutes. Theadsorption kinetics of U (VI) onto alginate beads can be described by a pseudo first-orderkinetic model. The adsorption isotherm can be described by the Redlich-Peterson model,and the maximum adsorption capacity was 237.15 mg/g. The sorption process is spontaneousand has an exothermic reaction.