Sorption of uranium(VI) from aqueous solutions by akaganeite


Yusan S. , Akyil S.

JOURNAL OF HAZARDOUS MATERIALS, cilt.160, ss.388-395, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 160
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.jhazmat.2008.03.009
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Sayfa Sayıları: ss.388-395

Özet

Removal of U(VI) ions from aqueous solutions was investigated using synthetic akaganeite-type nanocrystals. Nanocrystals of iron oxyhydroxides were synthesized with two different methods and then compared their adsorption capacities. Akaganeite (beta-FeOOH) was synthesized in the laboratory by precipitation from aqueous solution of Fe(III) chloride and different precipitating agents. The relative importance of test parameters like solution pH, contact time, temperature and concentration of adsorbate on adsorption performance of akaganeite for U(VI) ion were studied. Typical adsorption isotherms (Langmuir, Freundlich, Dubinin-Raduskevich) were determined for the mechanism of sorption process. Also the thermodynamic constants (Delta H degrees, Delta S degrees and Delta G degrees) were calculated. The product materials were examined by powder X-ray diffraction for crystalline phase identification and scanning electron microscope (SEM). (C) 2008 Elsevier B.V. All rights reserved.