“…Since it is known that polyoxometalates of the Keggin-type with cesium countercations are insoluble, we hypothesized that an appropriate surfactant, cesium dodecyl sulfate (CDS), could be used to prepare micelles in water upon which Keggin-type polyoxometalates (POM), such as H 3 PMo 12 O 40 , could be deposited and precipitated, yielding spherical polyoxometalate nanoparticles with a surfactant core and polyoxometalate surface (Scheme ). 1 Cryo-TEM image of micelle directed polyoxometalate nanoparticles. 1 Idealized Cartoon of the Cross Section of a CDS Micelle−POM Particle…”
Micelle directed polyoxometalate nanoparticles were synthesized by depositing H3+xPVxMo12-xO40 (x = 0, 2) by precipitation on micelles prepared from cesium dodecyl sulfate. The cryo-TEM image showed particles of about approximately 10 nm roughly consistent with the particle size computed from an idealized model. HRTEM coupled with EELS imaging to map the distribution of the elements also supported the formation of micelle directed polyoxometalate nanoparticles. In the aerobic oxidation of various sulfides to sulfoxides and sulfones, the clustered polyoxometalate assemblies supported on hydrophilic silica showed significantly higher catalytic activity versus that of nonclustered assemblies.
“…Since it is known that polyoxometalates of the Keggin-type with cesium countercations are insoluble, we hypothesized that an appropriate surfactant, cesium dodecyl sulfate (CDS), could be used to prepare micelles in water upon which Keggin-type polyoxometalates (POM), such as H 3 PMo 12 O 40 , could be deposited and precipitated, yielding spherical polyoxometalate nanoparticles with a surfactant core and polyoxometalate surface (Scheme ). 1 Cryo-TEM image of micelle directed polyoxometalate nanoparticles. 1 Idealized Cartoon of the Cross Section of a CDS Micelle−POM Particle…”
Micelle directed polyoxometalate nanoparticles were synthesized by depositing H3+xPVxMo12-xO40 (x = 0, 2) by precipitation on micelles prepared from cesium dodecyl sulfate. The cryo-TEM image showed particles of about approximately 10 nm roughly consistent with the particle size computed from an idealized model. HRTEM coupled with EELS imaging to map the distribution of the elements also supported the formation of micelle directed polyoxometalate nanoparticles. In the aerobic oxidation of various sulfides to sulfoxides and sulfones, the clustered polyoxometalate assemblies supported on hydrophilic silica showed significantly higher catalytic activity versus that of nonclustered assemblies.
“…Phillips and Price using the method of continuous variations have reported that no complex is formed between aluminum and this ligand in slightly acidic aqueous solution (11). These authors also observed a yellow fluorescence when aluminum ions were added to fused 2-methyl-8-quinolinol but cautioned that the observation need not be interpreted as evidence for chelation (9).…”
Section: Complexation Of Aluminummentioning
confidence: 99%
“…These authors also observed a yellow fluorescence when aluminum ions were added to fused 2-methyl-8-quinolinol but cautioned that the observation need not be interpreted as evidence for chelation (9).…”
Section: It Is Wellmentioning
confidence: 99%
“…Inoeganic ion exchangers have received increased attention recently (1,8,12) because of their high resistance to radiation and their very ef-ficient separation of alkali metal ions. Naturally occurring exchangers such as the zeolites have been known for a very long time, but the recent work has been with synthetic exchangers (1,4,6,(8)(9)(10)(11)(12)(13).…”
mentioning
confidence: 99%
“…In Hara's work no attempt was made to remove the cesium that had been adsorbed on TPM. In other work (1, 4, [8][9][10][11][12][13] the synthetic inorganic ion exchangers have been used in column form and alkali metals have been adsorbed and subsequently eluted, the usual eluent being ammonium salt of rather high concentration (>3M in general). Nitric acid is sometimes used.…”
Co!umn Ratio m e , M1. EDTA to titrate V+L Metal ione V*:M+" em. Theory Actual Difference V*: Fe+a 1:lO 1 . 2 X 6 1.02 V +I: Fe +* 1:25 1 . 2 X 16 0.98
The ion exchange behaviour of pyridinium molybdoarsenate has been investigated with some uni-and bi-valent cations. The slopes of the isotherms are widely different for various cations suggesting that separation of these ions is feasible. Barrer's equation has been applied to the exchange reaction and various thermodynamic parameters, viz. interaction energy between the ions on surface, thermodynamicequilibrium constant and free energy change for the exchange process, have been evaluated. This exchanger is found to be highly specific for TI+ ions and can be used for its removal from mixtures of various uni-and bi-valent cations.
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