کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1246062 | 969745 | 2007 | 6 صفحه PDF | دانلود رایگان |
The new type of the grafted polyurethane foam sorbents were prepared by coupling polyether polyol, toluene diisocyanate and basic dyestuff (Methylene blue, Rhodamine B and Brilliant green). The Me.B-PUF, Rh.B-PUF and Br.G-PUF were characterized using UV/vis, IR and TGA. The adsorption properties and chromatographic behaviour of these new adsorbents for preconcentration and separation of uranium(VI) ions at low concentrations from aqueous thiocyanate media were investigated by a batch process. The maximum sorption of U(VI) was in the pH ranges 1–4. The kinetics of sorption of the U(VI) by the Grafted-PUF were found to be fast with half life of sorption (t1/2) in 2.43 min. The average sorption capacity of different sorbents 0.124 meq g−1 for uranyl ions, enrichment factors ≈40 and the recovery 98–100% were achieved (R.S.D. ≈ 0.73%). The basic dyestuff Grafted-PUF could be used many times without decreasing their capacities significantly. The value of the Gibbs free energy (ΔG) for the sorbents is −7.3 kJ mol−1, which reflects the spontaneous nature of sorption process. The sorption mechanism of the metal ion onto Grafted-PUF was also discussed.
Journal: Talanta - Volume 71, Issue 1, 15 January 2007, Pages 236–241