کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1737746 1521580 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Uranium biosorption from aqueous solution onto Eichhornia crassipes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Uranium biosorption from aqueous solution onto Eichhornia crassipes
چکیده انگلیسی


• Biosorption of uranium onto Eichhornia crassipes is strongly pH dependent.
• Langmuir isotherm and pseudo-second-order kinetics best describe U(VI) biosorption.
• The U(VI) biosorption onto E. crassipes is spontaneous and endothermic.
• Coordination and ion exchange mechanisms could be involved U(VI) biosorption.

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 154, April 2016, Pages 43–51
نویسندگان
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