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Selective separation of rare earth ions from aqueous solution using functionalized magnetite nanoparticles: kinetic and thermodynamic studies
KTH, School of Engineering Sciences (SCI), Applied Physics, Functional Materials, FNM. Nuclear Materials Authority, Egypt.
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2017 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 327, p. 286-296Article in journal (Refereed) Published
Abstract [en]

Separation of rare earth ions (RE3+) from aqueous solution is a tricky problem due to their physico-chemical similarities of properties. In this study, we investigate the influence of the functionalized ligands on the adsorption efficiency and selective adsorption of La3+, Nd3+, Gd3+ and Y3+ from aqueous solution using Magnetite (Fe3O4) nanoparticles (NPs) functionalized with citric acid (CA@Fe3O4 NPs) or L-cysteine (Cys@Fe3O4 NPs). The microstructure, thermal behavior and surface functionalization of the synthesized nanoparticles were studied. The general adsorption capacity of Cys@Fe3O4 NPs was found to be high (98 mg g−1) in comparison to CA@Fe3O4 NPs (52 mg g−1) at neutral pH 7.0. The adsorption kinetic studies revealed that the adsorption of RE3+ ions follows a pseudo second-order model and the adsorption equilibrium data fits well to the Langmuir isotherm. Thermodynamic studies imply that the adsorption process was endothermic and spontaneous in nature. Controlled desorption within 30 min of the adsorbed RE3+ ions from both Cys@Fe3O4 NPs and CA@Fe3O4 NPs was achieved with 0.5 M HNO3. Furthermore, Cys@Fe3O4 NPs exhibited a higher separation factor (SF) in the separation of Gd3+/La3+, Gd3+/Nd3+, Gd3+/Y3+ ions compared to CA@Fe3O4 NPs.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 327, p. 286-296
Keywords [en]
Adsorption, Citric acid, Functionalization, L-cysteine, Magnetic nanoparticles, Rare earths
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-212210DOI: 10.1016/j.cej.2017.06.101ISI: 000408663800031Scopus ID: 2-s2.0-85026552653OAI: oai:DiVA.org:kth-212210DiVA, id: diva2:1134710
Note

QC 20170821

Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2017-09-27Bibliographically approved

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