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| The adsorption mechanism and adsorptive products of Escherichia coli and uranium(VI) in water |
| HUANG Rong1, QIN YI-lin1, NIE XIAO-qin1, DONG Fa-qin2, LIU MING-xue3, YANG Gang3, MA Jia-lin1, GONG JUN-yuan1, HUANG WEN-bo1, CHEN Bo1 |
1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
3. School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China |
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Abstract The accumulation behavior, adsorption model and adsorptive product for dry Escherichia coli powder adsorbing U(Ⅵ) were investigated by the batch absorption experiment, mesoscopic and spectroscopy characterization methods. The maximum biosorption capacity was 276.89mg/g when pH was 5and the initial U(Ⅵ) concentration was 50mg/L. The adsorption process could be well described by Langmuir isothermal model and the pseudo-second order model. FTIR (876.16cm-1, UO22+), SEM-EDS (2.4~4.4keV, U) and XRD results certified that U(Ⅵ) were successfully adsorbed on the cell surface of Escherichia coli. UO22+ mainly reacted with alkyl, amino, carboxyl and intermolecular hydrogen bond on the surface of Escherichia coli, especially complexing with P containing groups (PO2-, P(OH)2, PO43- and PO3-). After adsorption, U(Ⅵ) were transformed to uranium containing phosphate, such as CaU(PO4)2、Ca(UO2)2(PO4)2×xH2O and NaUO2(PO3)3.
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Received: 10 December 2015
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