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Parametric and thermodynamic study of molybdenum(VI) extraction by a 1-hydroxyhexadecylene-1,1-diphosphonic acid

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Abstract

The extraction of molybdenum(VI) from aqueous solutions has been investigated using 1-hydroxyhexadecylene-1,1-diphosphonic acid HPHPA which was synthesized and characterized by different analytical techniques. A parametric study of the extraction of molybdenum(VI) was carried out on different factors. The optimum conditions obtained were: contact time = 25 min, [Mo(VI)] = 0.0005M, [HNO3] = 0.001M, (Vaq/Vorg) = 1, [HPHPA] = 0.3M, and temperature = 20 °C. The values of the thermodynamic properties ΔH°, ΔS°, and ΔG° of the molybdenum(VI) extraction show respectively the exothermic nature of the extraction process, the low affinity of the extractant towards molybdenum(VI), and its slightly favorable feasibility at low temperature.

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Abbreviations

D:

Distribution coefficient

FTIR:

Fourier transform infrared

HPHPA:

1-Hydroxyhexadecylene-1,1-diphosphonic acid

[HPHPA]:

HPHPA acid concentration (M)

H4L:

Extracting agent (HPHPA)

[HNO3]:

Nitric acid concentration (M)

m f :

Mass of metal after extraction (g)

m i :

Initial mass of metal in the aqueous phase (g)

[Mo(VI)]:

Molybdenum (VI) concentration (M)

R :

Synthesis yield (%)

NMR:

Nuclear magnetic resonance

t :

Agitation time (min)

TMS:

Tetramethylsilane

UV–Visible:

Ultraviolet–Visible

V org :

Volume of the organic phase (ml)

V aq :

Volume of the aqueous phase (ml)

V aq/V org :

Volume ratio

ΔH°:

Apparent standard molar enthalpy (kJ/mol)

ΔS°:

Apparent standard molar entropy (J/mol·K)

ΔG°:

Apparent standard Gibbs free energy (kJ/mol)

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Authors and Affiliations

  1. Laboratory of Valorization of Fossil Energies, Department of Chemical Engineering, Polytechnic National School, Algiers, Algeria

    O. Rebas

  2. Division of Materials Process Engineering, CRND, Draria, Algiers, Algeria

    O. Rebas

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Rebas, O. Parametric and thermodynamic study of molybdenum(VI) extraction by a 1-hydroxyhexadecylene-1,1-diphosphonic acid. J Radioanal Nucl Chem 328, 455–464 (2021). https://doi.org/10.1007/s10967-021-07661-8

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  • DOI: https://doi.org/10.1007/s10967-021-07661-8

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