Spectrophotometric examination of the isopolyacide of molybdenum

Püngor, E.; Halász, A.

doi:10.1016/0022-1902(70)80114-2

Cited by 25 publications

(10 citation statements)

References 2 publications

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“…The formation of heptamolybdate ion, Mo 7 O 6− 24 , has been studied in the range (10,15) (10,15,(19)(20)(21)(22)(23)(24)(25)(26) in the region of pH < 1. As shown in Equation (1), the formation of nonstoichiometric polymers proceeds with an increase of [H + ], but in more acidic solutions at pH < 1, polymers dissociate into cationic species, HMoO 3 + , and H 3 MoO + 4 , which are considered to be dominant (24,25).…”

Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 99%

“…With an increase of the concentration of molybdenum, MoO 2− 4 ions polymerize to form isopolymolybdates. The formation mechanism of the isopolymolybdates, which is called meshing (10), has been investigated by many researchers (10)(11)(12)(13)(14)(15)(16)(17)(18)(19). The overall equation for the formation of the polymeric species of molybdenum in aqueous solutions can be written,…”

Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 99%

“…This observation agrees with that of the co-extraction of molybdenum with UO 2+ 2 in the PUREX solvent extraction. It has been reported that the cationic species give absorption spectra having an absorption peak at 246 nm (15). We obtained absorption spectra of 1 × 10 −3 M molybdenum in 0.09 M HNO 3 by absorption spectrometry.…”

Section: Extraction Of Molybdenum From Nitric Acid 137mentioning

confidence: 99%

“…The chemistry of molybdenum(VI) in aqueous solutions has been an area of intense activity since the late 1950s (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27). Because of the existence of anionic, cationic, and polymeric species, the behavior of molybdenum in the extraction experiments is complicated to understand.…”

Section: Introductionmentioning

confidence: 99%

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EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

Fujii

Yamana

Watanabe³

et al. 2001

Solvent Extraction and Ion Exchange

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The extraction behavior of molybdenum(VI) under the conditions of transuranium extraction (TRUEX) process was studied by using octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide. The extraction behavior of molybdenum(VI) under the condition of PUREX process was also investigated for comparison. The extraction of molybdenum with the copresence of uranium(VI), dysprosium(III), and the effect of oxalic acid were examined. Under the PUREX conditions, molybdenum was less extractable, while under the TRUEX process conditions, a higher distribution ratio of molybdenum was observed. Under the TRUEX conditions, the addition of oxalic acid was effective in depressing molybdenum extraction. It was concluded that, at the concentration of nitric acid ORDER REPRINTS 128FUJII ET AL.around 1 mol dm −3 or higher, Mo(VI) is extracted predominantly as cationic species, while at lower concentration of nitric acid, the coextraction of anionic molybdenum as a mixed complex with other metal, that is, UO 2+ 2 , occurs.

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Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 99%

Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 99%

Section: Extraction Of Molybdenum From Nitric Acid 137mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

Fujii

Yamana

Watanabe³

et al. 2001

Solvent Extraction and Ion Exchange

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“…The absorption spectrum is rather featureless, with two shoulders in between 330 and 340 nm and a tail toward the visible spectral region. It has been found using analytical ultracentrifugation that larger clusters absorb at longer wavelengths 16–18 . The featureless reflection spectrum of Na 2 Mo 2 O 7 powder obtained after the process of USP is also shown in Fig.…”

Section: Resultsmentioning

confidence: 89%

Novel Low‐Temperature Synthesis of Disodium Dimolybdate by Ultrasonic Spray Pyrolysis

Jovanović

Validžić

Janković

et al. 2007

Journal of the American Ceramic Society

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A new method for the synthesis of disodium dimolybdate (Na2Mo2O7) in the process of ultrasonic spray pyrolysis using acidified aqueous solutions of thermodynamically stable molybdenum (VI) oxide clusters as a precursor is described. Na2Mo2O7 particles were collected in alcohols (ethanol, 2‐propanol, isobutyl alcohol), and ultracentrifugation was used to isolate solid material from solution. Scanning electron microscopy revealed the formation of uniform spherical Na2Mo2O7 particles with an average diameter of about 0.25 μm. The X‐ray diffraction analysis undoubtedly confirmed the formation of orthorhombic Na2Mo2O7 for samples synthesized at a temperature as low as 300°C.

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The reduction of bromate at molybdenum oxide film cathodes

Bertotti

Pletcher

1996

Electroanalysis

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The catalytic reduction of bromate at vitreous carbon electrodes modified with a molybdenum oxide film at pH 3 has been investigated further. In addition, the reduction has been investigated at lower pH using molybdenum oxide films formed in situ from solutions containing both MoV' and BrOj. It is shown that in both systems, the variation of the current for bromate reduction with potential passes through a maximum and, hence, at more negative potentials, the surface is markedly less active for bromate reduction. With MoV' in solution, a recovery in the catalytic activity slowly occurs and this effect has also been investigated.

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Spectrophotometric examination of the isopolyacide of molybdenum

Cited by 25 publications

References 2 publications

EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

Novel Low‐Temperature Synthesis of Disodium Dimolybdate by Ultrasonic Spray Pyrolysis

The reduction of bromate at molybdenum oxide film cathodes

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