Separation of Ho3+ in Static Magnetic Field

Kołczyk, K.; Wojnicki, Marek; Kutyła, Dawid; Kowalik, Remigiusz; Żabiński, Piotr; Cristofolini, Andrea

doi:10.1515/amm-2016-0308

Cited by 19 publications

(20 citation statements)

References 9 publications

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“…where Abs λ is the absorbance value at a given λ wavelength [nm], ε λ is the molar absorption coefficient [dm 3 cm −1 mol −1 ], l is the optically active path length [cm] and C is a concentration of Ho(III) ions [moldm −3 ]. The values ε λ and l are constant and known [15] so it is possible to define the relationship between the concentration and absorbance as linear. The differences in the Ho(III) ions concentration from the two outputs were calculated as follows:…”

Section: Methods Of Analysismentioning

confidence: 99%

“…Among other things, the direct separation of ions allows solutions of certain metals to be concentrated with no need for nanoparticle synthesis or processes of adsorption and desorption on their surface which can make the processes last longer. Scientific works have dealt with the separation of ions of metals displaying ferromagnetic properties (Fe) [11] or ions of rareearth metals (REMs) [10,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Works [12,13] analyzed the change in the concentration of Dy(III) ions under the magnetic field generated by a neodymium magnet placed on the top of the solution. In other works [14,15] the separation was analyzed in a Ho(III) solution. In these cases, neodymium magnets were placed at the bottom of the solution.…”

Section: Introductionmentioning

confidence: 99%

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Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

et al. 2019

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An attempt is made to achieve a continuous enrichment of rare-earth metal ions from aqueous solutions in a microflow device by applying magnetic forcing. An aqueous solution containing holmium(III) ions is pumped through a small channel which was exposed to a strong inhomogeneous magnetic field. At the outflow, the near-and far-field parts of the flow are separated and analyzed using UV-Vis spectroscopy. The relative change of ion concentration is determined from the measured absorbance. Results are reported for three different types of flow cells at different flow rates and magnetic field strengths and for a cascaded application of cells. The change of concentration is found to be small, and no clear trend can currently be stated due to the error margin of the concentration measurement. Keywords Microflow. Spectrophotometry. Rare-earth elements. Magnetic field. Continuous separation Highlights • The influence of a magnetic field gradient on the transport of Ho(III) ions in microflow cells was studied. • The magnetic field gradient dependent on the orientation of the cell in the magnetic field was simulated. The distribution of Ho(III) ions is analyzed using UV/Vis spectroscopy. • A detailed analysis of different aspects influencing ion transport in the continuous flow process is presented.

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Section: Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

et al. 2019

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“…5 More recently, additional encouraging results on magnetomigration of ions have been published in the literature. 6- 12 Fujiwara et al demonstrated the separation of transition metals induced by magnetic field gradients of 40 mT 2 cm −1 . Silica gel supports were used to spot metal ions, which moved different distances depending on their magnetic susceptibilities.…”

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confidence: 99%

Magnetomigration of Rare-Earth Ions Triggered by Concentration Gradients

Rodrigues

Lukina

Dehaeck

et al. 2017

J. Phys. Chem. Lett.

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Mach-Zehnder interferometry was applied to explore the effects of inhomogeneous magnetic fields on the mobility of rare-earth ions in aqueous solutions. No migration of ions was observed in a thermodynamically closed system when a homogeneous solution was subjected to a magnetic field gradient alone. However, magnetomigration could be triggered by a concentration gradient of the rare-earth ions in the solution. When a concentration gradient was introduced in the sample by solvent evaporation, consistent migration of paramagnetic Dy ions from the bulk solution to regions with stronger magnetic fields was observed. By contrast, no movement was detected for diamagnetic Y ions in the presence of a concentration gradient.

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“…movement of paramagnetic ions of one type under the influence of a magnetic field, rather than magnetic separation. 14,15 Fujiwara et al demonstrated the motion of transition metal ions in solutions spotted on a silica gel support in the presence of magnetic fields. [16][17][18][19] Mach-Zehnder interferometry (MZI) was used to observe in situ the migration of Mn 2+ and Gd 3+ paramagnetic ions exposed to magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Susceptibility Gradient on the Magnetomigration of Rare-Earth Ions

et al. 2019

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Magnetomigration of rare-earth ions activated by thermal and evaporation-based gradients was demonstrated with the help of Mach-Zehnder interferometry. Magnetic susceptibility gradients were induced in aqueous solutions of rare-earth ions by local heating/cooling or by evaporation of the solvent. Both methods yielded the enrichment of strongly paramagnetic Dy 3+ ions in the region of the highest magnetic field. Three different orientations of the magnetic field were tested using temperature as the source of magnetic susceptibility gradient. Enhanced magnetomigration was observed when gradients of magnetic field and magnetic susceptibility were non-collinear, indicating that the rotational component of the magnetic force drives the process. Additionally, four rare-earth ions with distinct values of magnetic susceptibility were studied: the diamagnetic ion Y 3+ , and the paramagnetic ions Nd 3+ , Gd 3+ and Dy 3+. A strong correlation between the obtained magnetomigration and the magnetic susceptibility of the rare-earth ions was found. When heating/cooling or evaporation were stopped during magnetization experiments, the magnetic effect gradually faded. This demonstrates that the presence of magnetic susceptibility gradients in the system is crucial for the magnetomigration. These findings are of importance for the development of a magnetic separation process for rare-earth ions.

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Separation of Ho3+ in Static Magnetic Field

Cited by 19 publications

References 9 publications

Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

Magnetomigration of Rare-Earth Ions Triggered by Concentration Gradients

Effect of Magnetic Susceptibility Gradient on the Magnetomigration of Rare-Earth Ions

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