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Preparation and Characterization of Magnetic Iron Oxide Nanoparticles Functionalized by L- cysteine: Adsorption and Desorption Behavior for Rare Earth Metal Ions”
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2016 (Engelska)Ingår i: Journal of Environmental Chemical Engineering, ISSN 2160-6544, E-ISSN 2213-3437, Vol. 4, s. 3114-3121Artikel i tidskrift (Refereegranskat) [Forskning på konstnärlig grund] Published
Abstract [en]

In this work, magnetic iron oxide nanoparticles functionalized with l-cysteine (Cys-Fe3O4NPs) was synthesized and fully characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infra-red (FTIR), thermogravimetric analysis (TGA) and zeta potential measurements. The synthesized Cys-Fe3O4NPs has been evaluated as a highly adsorbent for the adsorption of a mixture of four rare earths RE3+ ions (La3+, Nd3+, Gd3+ and Y3+) from digested monazite solutions. The influence of various factors on the adsorption efficiency such as, the contact time, sample pH, temperature, and concentration of the stripping solution were investigated. The results indicate that Cys-Fe3O4 NPs achieve high removal efficiency 96.7, 99.3, 96.5 and 87% for La3+, Nd3+, Gd3+ and Y3+ ions, respectively, at pH = 6 within 15 min, and the adsorbent affinity for metal ions was found to be in order of Nd3+ > La3+ > Gd3+ > Y3+ ions. Using the Langmuir model, a maximum adsorption capacity of La3+, Nd3+, Gd3+ and Y3+ at room temperature was found to be 71.5, 145.5, 64.5 and 13.6 mg g−1, respectively. The Langmuir isotherm and pseudo-second order model fitted much better than the other isotherms and kinetic models. The obtained results for the thermodynamic parameters confirmed the spontaneous and endothermic nature of the process. Moreover, the desorption was carried out with 0.1 M nitric acid solutions. In addition, Cys-Fe3O4 NPs can be used as a highly efficient adsorbent for the adsorption of La3+, Nd3+, Gd3+ and Y3+ ions from digested monazite solutions.

Ort, förlag, år, upplaga, sidor
2016. Vol. 4, s. 3114-3121
Nyckelord [en]
Monazite; Magnetic nanoparticles; Adsorption; Rare earth elements; Desorption
Nationell ämneskategori
Kemi
Forskningsämne
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-200631DOI: 10.1016/j.jece.2016.06.022Scopus ID: 2-s2.0-84976874629OAI: oai:DiVA.org:kth-200631DiVA, id: diva2:1069721
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QC 20170201

Tillgänglig från: 2017-01-30 Skapad: 2017-01-30 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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Ashour, Radwa M.
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