|
|||||
|
|
Chemical enrichment and separation of uranyl ions in aqueous media using novel polyurethane foam chemically grafted with different basic dyestuff sorbents |
|
| Authors: | MF El-Shahat AB Farag |
| Institution: | a Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt b Chemistry Department, Faculty of Science, Mansoura University, Damietta, Egypt c Chemistry Department, Faculty of Science, Helwan University, Ain Helwan, Egypt |
| Abstract: | 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. |
| Keywords: | Uranium(VI) Enrichment Separation Polyurethane foam Basic dyestuff |
| 本文献已被 ScienceDirect 等数据库收录！ | |