Formation of Reverse Micelles and Extraction of Aluminum and Beryllium by Mixture of Bis(2-Ethylhexyl) Phosphoric Acid and Dinonylnaphthalene Sulfonic Acid.

Mashimo, Miki; Satō, Hiroshi; Komasawa, Isao

doi:10.1252/jcej.30.712

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Aerosol OT or sodium bis(2-ethyl-1-hexyl) sulfosuccinate (AOT) is the best known representative of this class of surfactants and has been studied by numerous methods [1]. Alteration of the interface due to the addition of a second surfactant can often give rise to enhancement of the solubilization capacity of mixed surfactant systems, which in turn can provide better performance in the activity of enzyme [2], extraction of protein [3], synthesis of nanoparticles [4,5], and other applications. The mechanism of water solubilization and phase separation due to the coalescence of droplets in reverse micellar systems has been modeled by Shah et al [6][7][8] and verified by Zana et al [9,10], Derouiche and Tondre [11], Abuin et al [12], Paul and Mitra [13] for both single and mixed surfactant systems.…”

Section: Introductionmentioning

confidence: 99%

Interface of AOT/Brij mixed reverse micellar systems: Conductometric and spectrophotometric investigations

Chatterjee

Mitra

Paul

et al. 2006

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Interface of AOT/Brij mixed reverse micellar systems: Conductometric and spectrophotometric investigations

Chatterjee

Mitra

Paul

et al. 2006

Journal of Colloid and Interface Science

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“…The effect of the formation of reverse micelles on the synergistic effect of metals has been investigated in the D2EHPA/DNNSA (dinonylnaphthalene sulfonic acid), , D2EHPA/M2EHPA [mono(2-ethylhexyl)phosphoric acid], and HEHφP (2-ethylhexyl phenylphosphonic acid)/DNNSA 77 systems. For the case of the D2EHPA/DNNSA system, when employed in the extraction of Al and Be, the distribution ratio is dependent on the relative magnitudes of the DNNSA concentration and the critical micelle concentration (CMC).…”

Section: Effect Of Chemical Reactions For Extracted Species In the Or...mentioning

confidence: 99%

Review of Advanced Liquid−Liquid Extraction Systems for the Separation of Metal Ions by a Combination of Conversion of the Metal Species with Chemical Reaction

Nishihama¹,

Hirai²,

Komasawa³

2001

Ind. Eng. Chem. Res.

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Recent developments in an advanced liquid-liquid extraction system for the separation of metal ions by combining a modification or chemical reaction of the metal species in the aqueous and organic phases demonstrate considerable potential. Possible techniques for the chemical conversion of aqueous-phase metal species include redox reactions for the metal ions, masking effects through the addition of water-soluble complexing agents, and complexing reactions with salting-out agents. For the conversion of organic-phase metal species, a synergistic effects through the addition of additional extractants and redox reactions for the extracted species are also useful. The separation of metal ions is effectively improved by the introduction of such chemical reactions to the extraction system.

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“…Dependences of the apparent rate constant of the phos phorylation of PEI 1 (1), PEI 2 (2, 3), PEI 3 (4, 5), and PEI 4 (6) in mixed micellar CTAB-PM solutions in chloro form on the mole fraction of CTAB and PM in the solu tion; C PEI = 0.01(1,2,(4)(5)(6),…”

mentioning

confidence: 99%

Mixed micelles of cetyltrimethylammonium bromide and poly(ethylene glycol)-600 monolaurate as catalysts of polyethylenimine phosphorylation in chloroform

et al. 2006

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Micelle formation in a cetyltrimethylammonium bromide-poly(ethylene glycol) 600 monolaurate-chloroform system in the absence and presence of hydroxybenzylated poly ethylenimines (PEI) was studied by dielcometric titration, NMR self diffusion, light scatter ing, and kinetic methods. A catalytic effect of mixed micelles on the reaction of 4 nitro phenylbis(chloromethyl)phosphinate with PEI was shown. The catalytic effect depends on the degree of substitution of PEI and composition of a surfactant mixture.Mixtures of surfactants are often used in detergent, cosmetic, pharmaceutical, and other compositions. 1 Mixed systems are of interest because of their ability to enhance metal extraction 2 and act as media for biocatalytic reactions 3 or catalysts of chemical processes. 4 Therefore, it is necessary to study the properties of mixed micellar systems. The most part of works 1,5-7 in this area concern aqueous solutions of surfactants. It is known that reverse micellar systems, including those of the mixed type, can act as nanoreactors for the synthesis of practically impor tant compounds. 8,9In the present work, we studied the micelle formation in a mixture of cationic (cetyltrimethylammonium bro mide, CTAB) and nonionogenic (poly(ethylene gly col) 600 monolaurate, PM) surfactants in chloroform and the effect of reverse micelles on the reaction of 4 nitrophenylbis(chloromethyl)phosphinate (NCP) with branched polyethylenimines (PEI) containing 2 hydroxybenzyl substituents at the secondary and ter tiary nitrogen atoms: CH 2 C 6 H 4 OH 2 (PEI 1) and CH 2 C 6 H 3 (OH 2)(i C 9 H 19 5) (PEI 2-PEI 4). The de gree of substitution (the number of substituted fragments per unsubstituted PEI fragment) for PEI 1, PEI 2, PEI 3, and PEI 4 was 0.3, 0.12, 0.16, and 0.3, respectively. ExperimentalCetyltrimethylammonium bromide (Sigma) was purified by recrystallization from an acetone-ethanol mixture, PM (Ferak) was used without preliminary purification, and NCP was syn thesized using an earlier described procedure. 10 Samples of hydroxybenzylated PEI were prepared by refluxing branched PEI (M 10 000) with 2 dimethylaminomethylphenol or 2 di methylaminomethyl(4 isononyl)phenol (transamination reac tion) on reflux for 5-10 h in p xylene followed by removal of volatiles and evacuation at 150 °С to constant weight. A sample of the initial PEI (Aldrich) was used as received. The molecular weight of monomeric units of PEI was determined by potentio metric titration. 11 Prior to use chloroform was purified by a standard method. 12 The reaction kinetics was studied spectrophotometrically under pseudo molecular conditions on a Specord UV-Vis spec trophotometer. Reaction rate constants were determined by the first order equation. The substrate concentration in kinetic ex periments was 5•10 -5 -2•10 -4 mol L -1 . The PEI concentration (mol L -1 ) was calculated from the molecular weight of the mo nomeric unit. 31 P NMR spectra were recorded on a Bruker MSL 400 in strument (162 MHz) using H 3 PO 4 as external standard. The concentration NCP and PE...

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Formation of Reverse Micelles and Extraction of Aluminum and Beryllium by Mixture of Bis(2-Ethylhexyl) Phosphoric Acid and Dinonylnaphthalene Sulfonic Acid.

Cited by 9 publications

References 7 publications

Interface of AOT/Brij mixed reverse micellar systems: Conductometric and spectrophotometric investigations

Interface of AOT/Brij mixed reverse micellar systems: Conductometric and spectrophotometric investigations

Review of Advanced Liquid−Liquid Extraction Systems for the Separation of Metal Ions by a Combination of Conversion of the Metal Species with Chemical Reaction

Mixed micelles of cetyltrimethylammonium bromide and poly(ethylene glycol)-600 monolaurate as catalysts of polyethylenimine phosphorylation in chloroform

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