Effect of coexisting alkaline metal ions on the extraction selectivity of lanthanide ions with calixarene car☐ylate derivatives

Ohto, Keisuke; Yano, Masayuki; Inoue, Katsutoshi; Nagasaki, Takeshi; Goto, Masahiro; Nakashio, Fumiyuki; Shinkai, Seiji

doi:10.1016/s0277-5387(96)00470-6

Cited by 52 publications

(28 citation statements)

References 15 publications

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“…It was suggested that extraction of Ba and Ce ions were improved by co-extraction of alkali metal ions [8]. These results suggested that the pH of metal solution influenced the complexation ability of 1.…”

Section: Extraction Ability From Metal Solutionsmentioning

confidence: 96%

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High Selective Extraction Ability for Platinum-group Metals Based on Thiacalix[6]arene Derivatives

Kondo

Ulzii

Itoh

et al. 2014

Int.J.Soc.Mater.Eng.Resour.

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Two kinds of new thiacalix [6]arene (TC6A) derivatives, TC6A-CH 2 COOH (1) and TC6A-CSN(CH 3 ) 2 (2), were synthesized through modify at the lower rims of TC6A. The extraction of 1 or 2 for rare metal ions from platinum-group metals (PGM) solution containing eight rare metals (Rh, Pd, Pt, Zr, Ce, Ba, La, Y) and one base metal (Al) were investigated. Compound 1 showed selective extractability for Pd and Zr ions, which the extraction rates were 70% and 91%, respectively. The extraction rates of the other metal ions were below 5% by using 1 and 2. Compound 1 also showed stripping extraction ability of Pd ion by 7N HCl where the stripping ratio was ca. 70%. On the other hand, compound 2 indicated high selectivity of almost 100% Pd ion extraction from PGM solution.

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Section: Extraction Ability From Metal Solutionsmentioning

confidence: 96%

“…50% over pH 1.2, though the extraction rate was 0% at pH 0.8. It seems that the extraction ability of 1 for Ba ion was improved in the presence of alkali metal ion (Na + ) where pH value was increased [8].…”

Section: Extraction Ability From Pgm Solutionmentioning

confidence: 99%

High Selective Extraction Ability for Platinum-group Metals Based on Thiacalix[6]arene Derivatives

Kondo

Ulzii

Itoh

et al. 2014

Int.J.Soc.Mater.Eng.Resour.

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“…It is interesting that the extract ability of 3 was increased when pH value gets higher, where 87% of the highest extract ability was done. Why the reason of high extractability of 3 at high pH value, it might be explained by the effect of coexisting alkaline metal ions on the extraction selectivity [21] , where the uptake of Na cations takes saturated phenoxy oxygens of 3 with Na cations. As a result, all of the phenoxyl oxgens of 3 might be combined at the near position withNa cation, rigidifying and preorganizing the extractant, which will make higher extractability of 3.…”

Section: +mentioning

confidence: 99%

Selective Extraction Ability of Thiacalix[6]arene Derivatives from Rare Metal Mixed Solution

Itoh

Yamada

et al. 2010

Int.J.Soc.Mater.Eng.Resour.

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In this study, a synthesis and extraction capability of two new thiacalix [6]arene (TC[6]A) derivatives modified at the lower or upper rims, which are TC[6]A-CH 2 CONEt 2 (1) and TC[6]A-CH 2 SCOCH 3 (2), respectively, will be discussed. The metal extraction properties of 1, 2, and TC[6]A (3), from automotive catalyst residue solution containing platinum-group metal cations (PGM solution) have been investigated. Compound 3 shows highest extraction capability for Zr cation which is ca. 87% (in pH 4.0 PGM solution). On the other hand, 1 shows the highest extraction capability for Zr cation which is ca. 63% (in pH 3.0 of PGM solution), 2 shows the highest extractability for Pd cation which is ca. 86% (in pH 1.5 of PGM solution) and second highest one for Zr cation which is ca. 57% (in pH 4.0 of PGM solution) respectively.

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“…Calix [4]arene is well-known to be capable of taking several conformations, 1 among those conformations, cone conformation makes possible the selective complexation with specific metal ions due to its rigid steric molecular structure and preorganized coordination structure to form the metal complex.…”

mentioning

confidence: 99%

“…[23][24][25] In the present paper, the silver ion selective electrode using calix[4]arene substituted by methyl ketonic groups at the lower rim is reported, to evaluate the silver ion selectivity against various metal ions. And this electrode is compared with that using calix [4]arene substituted by carboxylate groups at the lower rim. …”

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confidence: 99%

Silver Ion Selective Electrode Based on Calix[4]arene Methyl Ketonic Derivative

et al. 2001

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Calixarene has been studied as a selective complexing reagent for various metal ions and organic compounds to apply for separations and analyses. Calix [4]arene is well-known to be capable of taking several conformations, 1 among those conformations, cone conformation makes possible the selective complexation with specific metal ions due to its rigid steric molecular structure and preorganized coordination structure to form the metal complex.In our previous works, various functional groups have been introduced onto phenolic hydroxyl groups on the lower rim of calix [4]arene (focused to the cone conformation), and extractive separation characteristics have been examined. [2][3][4][5][6][7][8][9][10][11][12][13] In general, according to HSAB theory, ionophores having nitrogen or sulfur atoms in a molecule are favorable to complexation with soft heavy metal ions. For the sensing materials of silver ion-selective electrode, most works have been carried out on acyclic and cyclic poly ethers containing nitrogen and/or sulfur atoms, such as thia crown ethers and cryptands, with all or some oxygen atoms in poly ether bridge substituted by sulfur and/or nitrogen. 14-22 These compounds were employed as an ion-recognizable element of the silver ionselective electrode by the affinity of donor atom to silver ion as well as by a size effect of the cavity to each molecule during complexation. However, the ionophore having nitrogen atom as the coordination site tends to suffer from undesirable pH effects due to the interaction with hydrogen ion. Also, the compounds having sulfur atom as coordination site experience the lowering of silver ion selectivity against interfering ions due to the strong affinity of sulfur to soft metal ions. From our solvent extraction study, it was already revealed that 25,26,27,28-tetrakis (acetomethoxy)-5,11,17,23-tetrakis(1,1,3,3-tetramethylbutyl)-calix[4]arene (abbreviated to 1) has high selectivity for silver ion. Furthermore, such silver ion selectivity was maintained even in the highly acidic concentration region. 5 Basically, extractants containing nitrogen and sulfur atom as the binding sites have selectivity for multivalent metal ions among noble metal ions, such as palladium and gold. The development of the ionophore 1 as a solvent extraction reagent for silver ion was based on the strategy that the combination of both weak binding factors, fitting cavity size for silver ion and the coordination of hard and neutral carbonyl groups. The strategic aim was achieved and selectivity was brought to more preferable monovalent silver ion from multivalent hard and soft metal ions by a solvation extraction mechanism. However, from the viewpoint of solvent extraction technique, it is difficult to apply to commercial scale employment due to poor solubility of calixarene derivatives into organic solvents. That is the reason why we apply it as the ionophore for ion selective electrodes.Most research projects concerned with ion selective electrode using calixarene derivatives have been addressed to alkal...

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Effect of coexisting alkaline metal ions on the extraction selectivity of lanthanide ions with calixarene car☐ylate derivatives

Cited by 52 publications

References 15 publications

High Selective Extraction Ability for Platinum-group Metals Based on Thiacalix[6]arene Derivatives

High Selective Extraction Ability for Platinum-group Metals Based on Thiacalix[6]arene Derivatives

Selective Extraction Ability of Thiacalix[6]arene Derivatives from Rare Metal Mixed Solution

Silver Ion Selective Electrode Based on Calix[4]arene Methyl Ketonic Derivative

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