Separation of Transition Metal Ions in an Inhomogeneous Magnetic Field

Fujiwara, M.; Kodoi, D.; Duan, and W.; Tanimoto, Yoshifumi

doi:10.1021/jp003562d

Cited by 39 publications

(52 citation statements)

References 2 publications

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“…If the metal ions are paramagnetic ( > 0), F GMF works in the direction where the field intensity increases and the metal ions are attracted to move toward the maximum field [22,23]. As observed, the maximum intensity × gradient was estimated to be ∼700 T 2 m −1 at x = 0 and the maximum F GMF for the Cu 2+ ions calculated from Eq.…”

Section: Movement Of Paramagnetic Cu 2+ and Fe 2+ Ions In An Inhomogementioning

confidence: 55%

“…Extensive studies have demonstrated that Cu 2+ ions discharged into the water can cause serious damages to aquatic plants and living organisms [20]. Different from Se(IV), As(V), and As(III), Cu 2+ is paramagnetic ( = 1460 × 10 −9 L mol −1 ) [21] and will be attracted toward the maximum field in an inhomogeneous MF [22,23]. ZVI is ferromagnetic and can be magnetized in an external WMF.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced paramagnetic Cu2+ ions removal by coupling a weak magnetic field with zero valent iron

Xiao

Qiao

et al. 2015

Journal of Hazardous Materials

123

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Section: Movement Of Paramagnetic Cu 2+ and Fe 2+ Ions In An Inhomogementioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Enhanced paramagnetic Cu2+ ions removal by coupling a weak magnetic field with zero valent iron

Xiao

Qiao

et al. 2015

Journal of Hazardous Materials

123

View full text Add to dashboard Cite

“…The idea of complexation is to modify the properties such as the interaction between the ions/complexes with the adsorptive materials in adsorption process 39 . Furthermore, the complex formation and pH variation were also reported to enhance the separation in other mentioned methods [34][35][36][37][38][39][40][41] . Various separation methods for ionic species are summarized in Table 1.…”

Section: General Methods To Separate Metal Ionsmentioning

confidence: 99%

“…Some alternative methods can be chosen to separate ionic compounds including the most common solvent extraction 34 , ion exchange 35 , electrophoresis 36 , chromatography 37 , magnetic field 38 , adsorption 39 , membrane separation 40 , and also IL separation 41 . Each separation method has been studied separately to improve the performance.…”

Section: General Methods To Separate Metal Ionsmentioning

confidence: 99%

Solvent extraction of gold using ionic liquid based process

Makertihartha

Zunita

Rizki

et al. 2017

AIP Conference Proceedings

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Abstract. In decades, many research and mineral processing industries are using solvent extraction technology for metal ions separation. Solvent extraction technique has been used for the purification of precious metals such as Au and Pd, and base metals such as Cu, Zn and Cd. This process uses organic compounds as solvent. Organic solvents have some undesired properties i.e. toxic, volatile, excessive used, flammable, difficult to recycle, low reusability, low Au recovery, together with the problems related to the disposal of spent extractants and diluents, even the costs associated with these processes are relatively expensive. Therefore, a lot of research have boosted into the development of safe and environmentally friendly process for Au separation. Ionic liquids (ILs) are the potential alternative for gold extraction because they possess several desirable properties, such as a the ability to expanse temperature process up to 300°C, good solvent properties for a wide range of metal ions, high selectivity, low vapor pressures, stability up to 200°C, easy preparation, environmentally friendly (commonly called as "green solvent"), and relatively low cost. This review paper is focused in investigate of some ILs that have the potentials as solvent in extraction of Au from mineral/metal alloy at various conditions (pH, temperature, and pressure). Performances of ILs extraction of Au are studied in depth, i.e. structural relationship of ILs with capability to separate Au from metal ions aggregate. Optimal extraction conditon in order to gain high percent of Au in mineral processing is also investigated.

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“…A magnetic force was applied to migration analysis of micro-particles in solution and in air, [3][4][5][6][7][8][9][10] utilizing the proportionality between the magnetic force and the particle's magnetic susceptibility. Although a magnetic force is expected to be used as a non-contact and controllable force on a single micro-particle or molecular monolayer, serious difficulties exist in applications to diamagnetic organic molecules, because of the small magnetic susceptibility.…”

mentioning

confidence: 99%

Effects of a Magnetic Force on Surface-Enhanced Raman Spectra of a Cysteamine Linking Magnetic Particle and a Silver Colloid Plate

2007

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The controlled adsorption of alkanethiol on a metal surface is crucial for the fabrication of molecular sensors and organic electronics. Control of a molecular conformation and an orientation on the surface is highly required to attain high charge carrier mobility of a plastic circuit. 1 A self-assembled monolayer (SAM) of alkanethiol is known as a highly ordered monolayer, and a patterned SAM has been fabricated for bioelectronics with a microcontact printing method. 2 Another method to control the molecular conformation and the orientation is thought to be the application of an external force.Any particles are magnetized under magnetic field gradients, and a magnetic force works on the particles. A magnetic force was applied to migration analysis of micro-particles in solution and in air, [3][4][5][6][7][8][9][10] utilizing the proportionality between the magnetic force and the particle's magnetic susceptibility. Although a magnetic force is expected to be used as a non-contact and controllable force on a single micro-particle or molecular monolayer, serious difficulties exist in applications to diamagnetic organic molecules, because of the small magnetic susceptibility. Then, the use of magnetic particles (MPs) possessing a high magnetic susceptibility is promising for the application of magnetic forces on an organic molecule and a monolayer. The present study demonstrates the effects of magnetic forces on the conformation of cysteamine linking a MP and a silver colloid, by means of surface-enhanced Raman scattering (SERS) spectroscopy.Silver nitrate (99.9999%, Aldrich), tri-sodium citrate dehydrate (Nacalai Tesque, Inc., Japan), (3-aminopropyl)-trimethoxysilane (APTMS, 97%, Aldrich), glutaraldehyde (25%, Wako Pure Chemical Industries, Ltd., Japan), and cysteamine hydrochloride (98%, Sigma) were used as received. Super-paramagnetic amine-terminated particles (mean diameter = 1 μm, BioMag Plus Amine, Polysciences, Inc., USA) were washed 10 times with distilled water. All solutions were prepared with distilled and deionized water by a Milli-Q system (resistivity ≈18.2 MΩ cm -1 ). A citrate-reduced silver colloid solution was prepared according to a Lee and Meisel method. 11 A silver nitrate solution (1.1 mM, 200 ml) mixed with a sodium citrate solution (1% (w/w), 4 ml) was refluxed for 90 min. A glass plate (26 × 30 mm 2 ) was chemically modified with APTMS. A silver colloid solution (300 μl) was deposited on an APTMS activated plate for 1 night, and then washed with distilled water.The washed amine-terminated magnetic particles (MPs) were activated with 5% glutaraldehyde solution by shaking for 2 h. The activated MP solution was then added to a 17.6 mM cysteamine solution and shaken for 1 h. The MP solution was washed 20 times with distilled water to remove any unreacted cysteamine (final residue ≈6 pM), and deposited onto a silver colloid plate for 2 h. The sample plate was washed with distilled water just before measurements.Magnetic field gradients generated by two permanent magnets induced a magnetic force...

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Separation of Transition Metal Ions in an Inhomogeneous Magnetic Field

Cited by 39 publications

References 2 publications

Enhanced paramagnetic Cu2+ ions removal by coupling a weak magnetic field with zero valent iron

Enhanced paramagnetic Cu2+ ions removal by coupling a weak magnetic field with zero valent iron

Solvent extraction of gold using ionic liquid based process

Effects of a Magnetic Force on Surface-Enhanced Raman Spectra of a Cysteamine Linking Magnetic Particle and a Silver Colloid Plate

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