title: Uranium biosorption from aqueous solution onto Eichhornia crassipes.
abstract: Batch experiments were conducted to investigate the biosorption of U(VI) from aqueous solutions onto the nonliving biomass of an aquatic macrophyte Eichhornia crassipes. The results showed that the adsorption of U(VI) onto E. crassipes was highly pH-dependent and the best pH for U(VI) removal was 5.5. U(VI) adsorption proceeded rapidly with an equilibrium time of 30 min and conformed to pseudo-second-order kinetics. The Langmuir isotherm model was determined to best describe U(VI) biosorption with a maximum monolayer adsorption capacity of 142.85 mg/g. Thermodynamic calculation results indicated that the U(VI) biosorption process was spontaneous and endothermic. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis implied that the functional groups (amino, hydroxyl, and carboxyl) may be responsible for the U(VI) adsorption process, in which the coordination and ion exchange mechanisms could be involved. We conclude that E. crassipes biomass is a promising biosorbent for the removal of uranium pollutants.
authors: Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China; School 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.
authors: Zheng-ji
authors: ZJ
authors: Yi
authors: School 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. Electronic address: yaojun@ustb.edu.cn.
authors: Jun
authors: J
authors: Yao
authors: School 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.
authors: Hui-lun
authors: HL
authors: Chen
authors: School 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.
authors: Fei
authors: F
authors: Wang
authors: School 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.
authors: Zhi-min
authors: ZM
authors: Yuan
authors: Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China.
authors: Xing
authors: X
authors: Liu
mesh_terms: D000327:Adsorption; D031806:Eichhornia / Q000378:metabolism*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014501:Uranium / Q000378:metabolism*; D014875:Water Pollutants, Radioactive / Q000378:metabolism*
chemical_list: D014875:Water Pollutants, Radioactive; D014501:Uranium
keywords: Biosorption; Eichhornia crassipes; Isotherm; Kinetics; Uranium