scholarly journals New Trident Molecule with Phosphoric Acid Functionality for Trivalent Rare Earth Extraction

2017 ◽  
Vol 17 (3) ◽  
pp. 491 ◽  
Author(s):  
Keisuke Ohto ◽  
Hiromasa Murashima ◽  
Hiroshi Murakami ◽  
Shintaro Morisada ◽  
Hidetaka Kawakita ◽  
...  
Keyword(s):  
Rare Earth ◽  
Phosphoric Acid ◽  
Rare Earths ◽  
Equilibrium Constants ◽  
Extraction Equilibrium ◽  
Ph Values ◽  
Extraction Behavior ◽  
Separation Factors ◽  
Trivalent Rare Earth ◽  
Rare Earth Extraction

Tripodal extraction reagent with three phosphoric acid groups, together with the corresponding monopodal molecule has been prepared to investigate some metals extraction behavior, in particular, trivalent rare earth elements (REEs). The tripodal reagent exhibited extremely high selectivity for metals with high valency such as Zr(IV), In(III), Lu(III), and Fe(III). Tripodal reagent also exhibited exceptionally high extraction ability compared with the corresponding monopodal one in the extraction of trivalent rare earths. The result for the stoichiometry of tripodal reagent to heavy rare earths showed the inflection point between Er (2:1 for a ligand with ion) and Tm (1:1). The extraction reactions were determined for all rare earths with both reagents. The extraction equilibrium constants (Kex), the separation factors (β), half pH values (pH1/2), difference half pH values (ΔpH1/2) for extraction of REEs with both reagents are estimated.

Studies on Extraction Equilibrium of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and 1-Phenyl-3-Methyl-4-Benzoyl-Pyrazolone-5

2012 ◽  
Vol 602-604 ◽  
pp. 887-891 ◽  
Author(s):  
Zhong Wei Pan ◽  
Jin Huo Lin ◽  
Wen Jie Li ◽  
Tian Ci Wu ◽  
Jin Ding Pan
Keyword(s):  
Ionic Liquid ◽  
Rare Earths ◽  
Equilibrium Constants ◽  
Complete Recovery ◽  
Liquid Extraction ◽  
Rare Earth Ions ◽  
Extraction System ◽  
Extraction Equilibrium ◽  
Extraction Solvent ◽  
Separation Factors

The extraction equilibrium of four rare earth ions (REn+, n = 3 or 4) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid as extraction solvent and 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP, HP) as extractant. The extraction percentage could be higher than 99%. The extracted species in the REn+-[Bmim]PF6-HP system was neutral REPn (n = 3 or 4) and complete recovery of REn+ extracted into [Bmim]PF6 can be achieved using diluent HCl as stripping agent. [Bmim]PF6 can be recycled in the experiment. The extraction equilibrium constants and the pH1/2 values of four REs and their separation factors between adjacent rare earths were estimated and comparatively studied.

Studies on Temperature Dependent Ionic Liquid Solid-Liquid Extraction Behavior of Rare Earth

2013 ◽  
Vol 401-403 ◽  
pp. 817-821 ◽  
Author(s):  
Zhong Wei Pan ◽  
Wen Ting Weng ◽  
Hui Bing Yan ◽  
Yu Li Yu ◽  
Tian Ci Wu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Equilibrium Constants ◽  
Liquid Extraction ◽  
Extraction Temperature ◽  
Temperature Dependent ◽  
Extraction Behavior ◽  
Separation Factors ◽  
Solid Liquid Extraction ◽  
Solid Liquid

Temperature dependent solid-liquid extraction behavior of eight rare earth elements (REs) was investigated using N-butyl pyridinium hexafluorophosphate ([BPPF6) as an ionic liquid solvent and 8-hydroxyquinoline (HQ) as an extractant at 80 °C. Parameters including the amount of [BPPF6, HQ concentration, extraction time, extraction temperature and pH were investigated and optimized. The extracted species was neutral REQ3 in the RE3+-[BPPF6-HQ solid-liquid extraction system. The extraction percentage of RE3+ could be higher than 99%. The recovery of RE3+ extracted into [BPPF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid as stripping agents. The extraction equilibrium constants and the pH1/2 values of eight REs and their separation factors between adjacent rare earths were estimated and comparatively studied. REs were extracted into solid ionic liquid phase with smaller volume and concentrated to some extent. Furthermore the temperature dependent solid-liquid extraction allows to recover [BPPF6 after the extraction procedures. These results indicate that the proposed procedure can be used for the preconcentration and separation of REs using [BPPF6 with high melting point.

scholarly journals Comparative Extraction of Aluminum Group Metals Using Acetic Acid Derivatives with Three Different-Sized Frameworks for Coordination

Separations ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 211
Author(s):  
Keisuke Ohto ◽  
Nako Fuchiwaki ◽  
Hiroaki Furugou ◽  
Shintaro Morisada ◽  
Hidetaka Kawakita ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Metal Ions ◽  
Spectroscopic Data ◽  
Equilibrium Constants ◽  
Structural Effects ◽  
Extraction Equilibrium ◽  
Ph Values ◽  
Slope Analysis ◽  
Coordination Sites ◽  
Extraction Properties

We prepared acetic acid derivatives using three different frameworks, calix[4]arene, alkenyltrimethylol, and trihydroxytriphenylmethane, which differ in the number and size of their coordination sites. We further investigated the extraction properties for aluminum group metal ions. All three extraction reagents exhibited increased extraction compared with the corresponding monomeric compounds, owing to structural effects. The extraction reaction and extraction equilibrium constants were determined using a slope analysis. Their extraction abilities, separation efficiencies, and potential coordination modes are discussed using the extraction equilibrium constants, half-pH values, and spectroscopic data. The calix[4]arene and trihydroxytriphenylmethane derivatives demonstrated allosteric co-extraction of indium ions (In3+) with an unexpected stoichiometry of 1:2.

Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and Benzoyl Acetone

2011 ◽  
Vol 335-336 ◽  
pp. 1428-1432 ◽  
Author(s):  
Zhong Wei Pan ◽  
Chang Ma ◽  
Ying Wu Zhang ◽  
Yu Xia Huang ◽  
Xing Lin Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Rare Earths ◽  
Liquid Extraction ◽  
Rare Earth Ions ◽  
Extraction System ◽  
Tetraacetic Acid ◽  
Extraction Percentage ◽  
Extraction Solvent ◽  
Extraction Behavior

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA. When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%. The extracted species in the RE3+-[Bmim]PF6-HA system was neutral REA3 and the recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.

Effects of Rare Earths and Yttrium on Striated Muscle and the Neuromuscular Junction

1972 ◽  
Vol 50 (6) ◽  
pp. 603-611 ◽  
Author(s):  
John M. Bowen
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Time Course ◽  
Striated Muscle ◽  
Ringer Solution ◽  
Solution Ph ◽  
Rare Earth Ion ◽  
End Plate ◽  
Trivalent Rare Earth ◽  
Frog Sartorius

Effects of several rare earths and yttrium on isolated frog sartorius muscles were investigated. Lanthanum (La), praseodymium, neodymium (Nd), samarium, gadolinium, dysprosium, erbium, thulium, ytterbium, and yttrium (Y) inhibited twitch tension of indirectly stimulated preparations. Concentrations required to reduce twitch tension to 50% of control tension in 15 min ranged between 0.52 mM and 1.10 mM (Ringer solution; pH 6.0). Similar concentrations (La, Nd, and Y) also inhibited twitch tension of directly stimulated, curarized preparations. A relationship between effect on twitch tension and atomic number was not found. La (0.3 mM) and Y (0.3 mM) reduced the amplitude, but did not appear to alter the time course, of extracellularly recorded end-plate potentials (E.P.P.'s). Amplitudes of intracellularly recorded E.P.P.'s were reduced by La (0.0125–0.05 mM) and Y (0.0125 and 0.025 mM). Effect on quantal contents of E.P.P.'s indicated that the principal action of both agents was an inhibition of transmitter release. La (0.025 and 0.05 mM) and Y (0.05 mM) significantly increased the frequency of miniature end-plate potentials. It is concluded that the prejunctional membrane does not differentiate significantly between the action of the trivalent rare earth ion lanthanum and the action of the trivalent rare-earth-like ion yttrium.

scholarly journals SORPTION OF RARE-EARTH METALS FROM NO EVAPORATED DIHYDRATE PHOSPHORIC ACID ON MACROPOROUS STRONGLY ACIDIC CATIONITE

2018 ◽  
Vol 59 (4) ◽  
pp. 50
Author(s):  
Aleksandr V. Firsov ◽  
Aleksandr V. Artamonov ◽  
Dar'ya N. Smirnova ◽  
Aleksandr P. Ilyin ◽  
Segreiy P. Kochetkov
Keyword(s):  
Rare Earth ◽  
Phosphoric Acid ◽  
Dynamic Characteristics ◽  
Rare Earths ◽  
Rare Earth Metals ◽  
Diffusion Region ◽  
External Diffusion

The kinetic and dynamic characteristics of the sorption of rare earths metals (REE) from no evaporated extration phosphoric acid (EPA) of dihydrate production on macroporous strongly acidic cation Rurolite C150 were investigated. The process of sorption of rare earth metals was established to take place in the external diffusion region.

Rare earth extraction from wet process phosphoric acid by emulsion liquid membrane

2016 ◽  
Vol 34 (7) ◽  
pp. 717-723 ◽  
Author(s):  
Lichang ZHANG ◽  
Qianlin CHEN ◽  
Chao KANG ◽  
Xin MA ◽  
Zunliang YANG
Keyword(s):  
Rare Earth ◽  
Phosphoric Acid ◽  
Liquid Membrane ◽  
Emulsion Liquid Membrane ◽  
Wet Process ◽  
Rare Earth Extraction

Sensibilisierte IR-Emission der dreiwertigen Seltenen Erden in Sr3La2W2O12 / Sensitized IR Emission of the Trivalent Rare Earths in Sr3La2W2O12

1984 ◽  
Vol 39 (11) ◽  
pp. 1115-1119
Author(s):  
R. Braun ◽  
S. Kemmler-Sack
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Rare Earths ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Trivalent Rare Earth ◽  
Ir Emission

By activation of the host lattice Sr3La2W2O12 with the trivalent rare earth ions Nd, Ho. Er. Tm and Yb an intense IR emission is observed, which can be sensitized by energy transfer from Nd3+ to Yb3+, from Er3+ to Ho3+ or Tm3+, from Tm3+ to Ho3+, and from Yb3+ to Ho3+ or Tm3+. For all other couples of trivalent rare earth ions no significant energy transfer is detected.

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