Biosorption of U(VI) from aqueous systems by malt spent rootlets. Kinetic, equilibrium and speciation studies

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• 作者：V. Anagnostopoulos ; B. Symeopoulos…
• 关键词：Uranium ; Uptake ; Isotherm ; Kinetics ; Titration ; Modelling
• 刊名：International Journal of Environmental Science and Technology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：13
• 期：1
• 页码：285-296
• 全文大小：992 KB
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• 作者单位：V. Anagnostopoulos (1) (4)
  B. Symeopoulos (1)
  K. Bourikas (2)
  A. Bekatorou (3)
  
  1. Laboratory of Radiochemistry, Department of Chemistry, University of Patras, 26500, Patras, Greece
  4. Applied Research Center, Florida International University, 10555 W Flagler Str, EC 2100, Miami, FL, 33174, USA
  2. School of Science and Technology, Hellenic Open University, 26223, Patras, Greece
  3. Food Biotechnology Group, Department of Chemistry, University of Patras, 26500, Patras, Greece
  
• 刊物主题：Environment, general; Environmental Science and Engineering; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Soil Science & Conservation; Ecotoxicology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1735-2630

文摘

Α low-cost and environmentally friendly clean-up technique is evaluated in this study, based on the use of a brewery by-product, malt spent rootlets, as potential biosorbent for U(VI) sequestration from aquatic systems. Uranium uptake was rapid (2.5 h at 25 °C), and MSR exhibited capability of removing U(VI) from effluents of high acidity (pH 1.5) and salinity (0.5 M NaCl and NaNO₃). Maximum uptake was 157 mg U(VI) g−1 at 25 °C. The pseudo-second-order model gave the best fit for kinetic data, whereas film diffusion was the rate-controlling step. Langmuir adsorption isotherm was the best fitting model. Activation energy, thermodynamic data and the extent of sorption reversibility implied that sorption of U(VI) is predominantly chemical. FTIR studies showed that lignin moieties are mainly responsible for U(VI) uptake. Speciation modeling showed that only positively charged and uncharged uranium species can be retained on the biomass. Finally, desorption studies revealed that Na₂CO₃ was the most efficient eluent with 78 % of U(VI), previously bound on the biosorbent’s surface, recovered. Keywords Uranium Uptake Isotherm Kinetics Titration Modelling