Journal of Radioanalytical and Nuclear Chemistry

, Volume 299, Issue 3, pp 1469–1477 | Cite as

Removal of uranium(VI) from aqueous solutions using nanoporous ZnO prepared with microwave-assisted combustion synthesis

  • Ümit H. Kaynar
  • Mehmet Ayvacıklı
  • Sermin Çam Kaynar
  • Ümran Hiçsönmez
Article
First Online:
Received:

Abstract

The adsorption of the uranyl ions from aqueous solutions on the nanoporous ZnO powders has been investigated under different experimental conditions. The adsorption of uranyl on nanoporous ZnO powders were examined as a function of the contact times, pH of the solution, concentration of uranium(VI) and temperature. The ability of this material to remove U(VI) from aqueous solution was followed by a series of Langmuir and Freunlinch adsorption isotherms. The adsorption percent and distribution coefficient for nanoporous ZnO powders were 98.65 % ± 1.05 and 7,304 mL g−1, respectively. The optimum conditions were found as at pH 5.0, contact time 1 h, at 1/5 Zn2+/urea ratio, 50 ppm U(VI) concentration and 303 K. The monomolecular adsorption capacity of nanoporous ZnO powders for U(VI) was found to be 1,111 mg g−1 at 303 K. Using the thermodynamic equilibrium constants obtained at different temperatures, various thermodynamic parameters, such as ΔG°, ΔH° and ΔS°, have been calculated. Thermodynamic parameters (ΔH° = 28.1 kJ mol −1, ΔS° = 160.30 J mol−1 K−1, ΔG° = −48.54 kJ mol−1) showed the endothermic and spontaneous of the process. The results suggested that nanoporous ZnO powders was suitable as sorbent material for recovery and adsorption of U(VI) ions from aqueous solutions.

Keywords

Adsorption Uranium Nanoporous ZnO powders Combustion synthesis 
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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  • Ümit H. Kaynar
    • 1
  • Mehmet Ayvacıklı
    • 2
  • Sermin Çam Kaynar
    • 2
  • Ümran Hiçsönmez
    • 3
  1. 1.Education Faculty, Primary School Science TeachingCelal Bayar UniversityDemirci, ManisaTurkey
  2. 2.Department of PhysicsCelal Bayar UniversityManisaTurkey
  3. 3.Department of ChemistryCelal Bayar UniversityManisaTurkey

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