Solvent extraction separation studies of iron (III), cobalt (II), nickel (II) and copper (II) from aqueous solution with 1-phenyl-3-methyl-4-(p-nitrobenzoyl)-5-pyrazolone

Ogwuegbu, M. O. C.; Oforka, N. C.

doi:10.1016/0304-386x(94)90072-8

Cited by 16 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the past 3 decades, a considerable amount of work has been carried out and reported [3][4][5][6][7][8][9][10][11][12][13][14] on iron(III) removal from solutions by solvent extraction. Most of these studies, however, examine the extraction of iron when its concentration in solution is not very high, which will be the condition if pure iron oxide is produced in bulk through solvent extraction techniques.…”

Section: Introductionmentioning

confidence: 99%

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Sahu

Das

1997

Metall Mater Trans B

View full text Add to dashboard Cite

The extraction of iron(III) from chloride solutions at macrolevel concentration by different solvents such as tri-n-butyl phosphate (TBP), di(2-ethylhexyl) phosphoric acid (D2EHPA), and their mixture in various proportions has been investigated at different acid concentrations. The synergistic extraction of iron(III) with a mixture of TBP and D2EHPA was studied and the results were compared with that of the extraction by individual solvent alone. An increase in the concentration of the synergist, TBP, in the D2EHPA-TBP solvent system resulted in an increase in the synergistic coefficient value. The experimental data are treated graphically to explain the formation of organic phase extracted species, and the equilibrium extraction constants for the species are determined. It is found that a maximum of two molecules of TBP are adducted to the extracted species of the corresponding nonsynergistic system. Stripping of iron(III) with hydrochloric acid from loaded D2EHPA was found to increase with an increase in acid concentration. In the case of D2EHPA-TBP mixtures, stripping efficiency was increased with an increase in acid concentration up to a certain level and then it was decreased. The experimental results indicate that an iron exchange reaction between loaded D2EHPA and TBP proceeds during stripping at a higher concentration of hydrochloric acid (from mixed loaded solvent system). A plausible mechanism for iron(III) extraction and stripping has been discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Sahu

Das

1997

Metall Mater Trans B

View full text Add to dashboard Cite

show abstract

“…From the results in figure 3, it was possible to predict the separability or otherwise of one of the metal ions from the other using 0.02 M HBPy in chloroform. The degree of separation was determined in terms of ‗Separation Factor', S f , defined as the ratio of the respective equilibrium constant (K ex ) for the desired metal ion, M 1 to that of the contaminant metal ion M 2 (Ogwuegbu & Oforka, 1994). Thus: S f = K ex (W)/ Kex (Mn) = -7.48/ -6.91 = 1.08…”

Section: Separation Of Mn (Ii) From W (Vi)mentioning

confidence: 99%

Liquid-liquid Extraction Separation of Manganese (II) and Tungsten (VI) by 4-butanoyl-3-methyl-1-phenylpyrazol-5-one in Chloroform

A.I.C¹,

Ibe²,

Achinihu³

et al. 2014

IOSRJAC

View full text Add to dashboard Cite

The extraction of manganese (II) and tungsten (VI) from aqueous solution using in chloroform was studied as a function of extractant's concentrations and pH. The results indicate that the degree of extraction of Mn (II) and W (VI) is dependent on the extractant's concentrations by a factor of two (2). This means that two moles of the HBPy ligand anion were complexed by one mole each of the Mn(II) and W (VI) ions, indicating that the extracted species both have metal-ligand mole ratio of 1:2, hence the Mn (II) and W (VI) complexes extracted are of composition, Mn(BPy) 2 and WO 2 (BPy) 2 respectively. The extractant equilibrium constants are log K ex = -0.36 and -0.98 for the Mn(BPy) 2 and WO 2 (BPy) 2 respectively, showing that the HBPy is a more effective extractant for Mn (II) than W (VI). Again, the metals are more quantitatively recovered from the aqueous solution at higher acidity (lower pH). The separation factor for these metals using the reagent is reported and shows that the metals can be separated effectively from their mixtures by proper adjustment of the pH of the medium.

show abstract

“…However, the extraction of Fe(II), Cu(II), Th(IV), the alkaline earths and the actinides under these conditions is insignificant. This makes it possible for selective separation and isolation of Co(II) in the presence of these elements [9]. The presence of a nitro group in the extractant is expected to increase the acid properties (pka = 3.610 ± 0.3) and making it more extractive than most of the existing reagents.…”

Section: Effect Of Extractant Concentrationmentioning

confidence: 99%

“…Available reports on solvent extraction methods for cobalt (Co) appear to focus more on the use of organophosphorus compounds or extractants [1][2][3][4] and little has been published on the use of pyrazolones; and that is why this study is important. Pyrazolones are prominent analytical reagents [5][6][7][8] and potent drugs or pharmaceutical agents [9][10][11][12]. The importance of these compounds lies in their ability to form complexes with many metal ions under varied experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Studies on Extraction Behaviour of Cobalt(II) with Nitrobenzoylprazolone-5

Gerald¹,

Judith²,

Martin³

2013

JMMCE

View full text Add to dashboard Cite

The extraction of Cobalt(II) from aqueous solution using 1-phenyl-3-methyl-4-(p-nitrobenzoyl)pyrazolone (HPMNP) in various organic solvents was studied as a function of pH and extractant concentration. Extraction into organic chloroform phase was more efficient than with any other solvent. The extraction equilibrium constant was found to be log K ex = −7.04. Optimum conditions for extraction of Co(II) exist at pH of between 5.5 and 7.0, ionic strength of 0.3 M and constant extractant concentration of 0.02 M. Shaking the organic Co(II) chelate complex with 0.2 M acid strips the Co(II) ions into the aqueous phase. It was established that Co(II) complex extracted is of composition, Co(PMNP) 2 .

show abstract

Solvent extraction separation studies of iron (III), cobalt (II), nickel (II) and copper (II) from aqueous solution with 1-phenyl-3-methyl-4-(p-nitrobenzoyl)-5-pyrazolone

Cited by 16 publications

References 10 publications

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Liquid-liquid Extraction Separation of Manganese (II) and Tungsten (VI) by 4-butanoyl-3-methyl-1-phenylpyrazol-5-one in Chloroform

Studies on Extraction Behaviour of Cobalt(II) with Nitrobenzoylprazolone-5

Contact Info

Product

Resources

About