The biosorption characteristics of U(VI) from aqueous solution onto a nonliving aquatic macrophyte, Hydrilla verticillata (dry powder), were investigated under various experimental conditions by using batch methods. Results showed that the adsorption reached equilibrium within 60 min and the experimental data were well fitted by the pseudo-first-order kinetic model. U(VI) adsorption was strongly pH dependent, and the optimum pH for U(VI) removal was 5.5. Isotherm adsorption data displayed good correlation with the Langmuir model, with a maximum monolayer adsorption capacity of 171.52 mg/g. Thermodynamic studies suggested that U(VI) adsorption onto H. verticillata was an exothermic and spontaneous process in nature. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy indicated that the amino and hydroxyl groups on the algal surface played an important role in U(VI) adsorption. The mechanisms responsible for U(VI) adsorption could involve electrostatic attraction and ion exchange. In conclusion, H. verticillata biomass showed good potential as an adsorption material for the removal of uranium contaminants in aqueous solution.
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Research Article|
December 23 2016
Uranium biosorption from aqueous solution by the submerged aquatic plant Hydrilla verticillata
Zheng-ji Yi;
Zheng-ji Yi
1School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China
2Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
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Jun Yao;
1School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China
E-mail: yaojun@ustb.edu.cn
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Mi-jia Zhu;
Mi-jia Zhu
1School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China
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Hui-lun Chen;
Hui-lun Chen
1School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China
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Fei Wang;
Fei Wang
1School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China
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Xing Liu
Xing Liu
2Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
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Water Sci Technol (2017) 75 (6): 1332–1341.
Article history
Received:
July 02 2016
Accepted:
December 05 2016
Citation
Zheng-ji Yi, Jun Yao, Mi-jia Zhu, Hui-lun Chen, Fei Wang, Xing Liu; Uranium biosorption from aqueous solution by the submerged aquatic plant Hydrilla verticillata. Water Sci Technol 23 March 2017; 75 (6): 1332–1341. doi: https://doi.org/10.2166/wst.2016.592
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