tailieunhanh - Removal of uranium from aqueous solution by alginate beads

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 alginate beads were characterized by using scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Fourier transform infrared spectra indicated that hydroxyl and alkoxy groups are present at the surface of the beads. | Removal of uranium from aqueous solution by alginate beads N u c l e a r E n g i n e e r i n g a n d T e c h n o l o g y 4 9 ( 2 0 1 7 ) 5 3 4 e5 4 0 Available online at ScienceDirect Nuclear Engineering and Technology journal homepage: Original Article Removal of Uranium from Aqueous Solution by Alginate Beads Jing Yu a,b, Jianlong Wang a,c,*, and Yizhou Jiang b a Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, , Tsinghua Yuan, Beijing 100084, P. R. China b Northwest Institute of Nuclear Technology, 28, Pingyu Road, Baqiao District, Xian, 710024, P. R. China c Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, , Tsinghua Yuan, Beijing 100084, P. R. China article info abstract Article history: The adsorption of uranium (VI) by calcium alginate beads was examined by batch exper- Received 19 February 2016 iments. The effects of environmental conditions on U (VI) adsorption were studied, Received in revised form including contact time, pH, initial concentration of U (VI), and temperature. The alginate 24 July 2016 beads were characterized by using scanning electron microscopy, transmission electron Accepted 13 September 2016 microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectros- Available online 5 October 2016 copy. Fourier transform infrared spectra indicated that hydroxyl and alkoxy groups are present at the surface of the beads. The experimental results showed that the adsorption of Keywords: U (VI) by alginate beads was strongly dependent on pH, the adsorption increased at pH 3~7, Adsorption then decreased at pH 7~9. The adsorption reached equilibrium within 2 minutes. The Biosorbent adsorption kinetics of U (VI) onto alginate beads can be described by a pseudo first-order Alginate kinetic model. The adsorption isotherm can be described by the Redlich-Peterson .