Home > Articles > Highly efficient and selective extraction of uranium from aqueous solution by a magnetic device: succinyl-ß-cyclodextrin-APTES@maghemite nanoparticles
Resumen: The removal of radio-elements, notably uranium, from waste-waters is crucial for public health and environmental remediation. To this end, succinyl-ß-cyclodextrin (SßCD) is grafted onto maghemite nanoparticles (NPs) synthesized by the polyol method. The nanocomposite was well characterized. The adsorption of U(VI) by SßCD-APTES@Fe2O3 is pH-dependent with a maximum at pH 6. Adsorption occurs mainly by complex formation and displays a very good selectivity for U(VI) compared to other cations such as Cs+, K+, Na+, Mg2+ and Al3+. The data were plotted according to the Langmuir, Freundlich, Elovich, Temkin and Halsey isotherms. The Langmuir isotherm maximum adsorption capacity (qmax) is 286 mg U g-1 and higher than for other reported sorbents. Moreover, Cs-corrected STEM visualizes the uranium on the NP surface, which is consistent with the Halsey isotherm model for multilayer adsorption. The U(VI) adsorbed on SßCD-APTES@Fe2O3 is easily recovered by magnetic sedimentation and desorption performed in a small volume in order to concentrate the extract. The nanocomposite can be regenerated and re-used at least tenfold. Idioma: Inglés DOI: 10.1039/C7EN00902J Año: 2018 Publicado en: Environmental science. Nano 5, 1 (2018), 158-168 ISSN: 2051-8153 Factor impacto JCR: 7.704 (2018) Categ. JCR: ENVIRONMENTAL SCIENCES rank: 11 / 250 = 0.044 (2018) - Q1 - T1 Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 17 / 94 = 0.181 (2018) - Q1 - T1 Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 24 / 172 = 0.14 (2018) - Q1 - T1 Factor impacto SCIMAGO: 1.936 - Materials Science (miscellaneous) (Q1) - Environmental Science (miscellaneous) (Q1)