Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 154, Issue -, Pages 43-51Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2016.01.012
Keywords
Uranium; Biosorption; Eichhornia crassipes; Isotherm; Kinetics
Categories
Funding
- National Natural Science Foundation of China [41273131, 41273092, 41430106, 41573080]
- Aid programs for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Key Discipline of Hunan Province
Ask authors/readers for more resources
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. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available