Synthesis, characterization, and application of polystyrene adsorbents containing tri-n-butylphosphate for solid-phase extraction of uranium (VI) from aqueous nitrate solutions
| Autor: | Mohamed E. Sheta, Ahmed H. Moustafa, H. M. Killa, Ahmad A. Tolba, Mohamed G. Mahfouz |
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| Rok vydání: | 2014 |
| Předmět: |
Aqueous solution
Health Toxicology and Mutagenesis Extraction (chemistry) Inorganic chemistry Public Health Environmental and Occupational Health Langmuir adsorption model Divinylbenzene Pollution Analytical Chemistry Styrene chemistry.chemical_compound symbols.namesake Adsorption Nuclear Energy and Engineering chemistry Desorption symbols Radiology Nuclear Medicine and imaging Polystyrene Spectroscopy |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 301:739-749 |
| ISSN: | 1588-2780 0236-5731 |
| DOI: | 10.1007/s10967-014-3214-y |
| Popis: | Polystyrene adsorbent for solid-phase extraction of U(VI) was developed through in situ copolymerization of styrene and divinylbenzene in the presence of tri-n-butylphosphate and its magnetic form was obtained by addition of fine particles of magnetite in an amount of 15 wt% of the total monomers used. The obtained adsorbents were characterized by means of scanning electron microscope, FTIR spectroscopy and X-ray powder diffraction. The adsorption behavior of U(VI) from aqueous nitrate solutions onto non-magnetic adsorbent RI (St–DVB–TBP) and its magnetic form RII (St–DVB–TBP–Fe3O4) at different experimental condition was studied using batch method. The adsorption results were found to fit Langmuir model. The magnetite-containing adsorbent showed higher uptake values relative to the corresponding magnetite-free one. The adsorption of U(VI) onto RI followed pseudo-first order kinetics whereas the adsorption onto RII followed pseudo-second order. Thermodynamic studies revealed that the adsorption process was a spontaneous exothermic reaction. Desorption of the loaded U(VI) was carried out using distilled water and found to be 97 and 93 % for RI and RII, respectively. |
| Databáze: | OpenAIRE |
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