Kinetics and Mechanism of Solvent Extraction of Manganese(II), Lanthanum(III) and Zirconium(III) from Aqueous Solution with Chloroform Solution of 3-Methyl-1-Phenyl-4-Stearoylpyrazol-5-One

International Journal of Applied Chemistry

© 2021 by SSRG - IJAC Journal

Volume 8 Issue 3

Year of Publication : 2021

Authors : Appolinus.I. Ehirim, Kenneth O. Amanze, Prisca C. Ikechukwu-Nwankwo, Martin O.C. Ogwuegbu.

10.14445/23939133/IJAC-V8I3P102

How to Cite?

Appolinus.I. Ehirim, Kenneth O. Amanze, Prisca C. Ikechukwu-Nwankwo, Martin O.C. Ogwuegbu., "Kinetics and Mechanism of Solvent Extraction of Manganese(II), Lanthanum(III) and Zirconium(III) from Aqueous Solution with Chloroform Solution of 3-Methyl-1-Phenyl-4-Stearoylpyrazol-5-One," SSRG International Journal of Applied Chemistry, vol. 8,  no. 3, pp. 10-17, 2021. Crossref, https://doi.org/10.14445/23939133/IJAC-V8I3P102

Abstract:

Kinetics and mechanism of solvent extraction of manganese(II), lanthanum(III), and zirconium(III) in their aqueous solutions with chloroform solution of 3-methyl-1-phenyl-4-stearoylpyrazol-5-one (HSPy) have been investigated at various conditions of pH and HSPy concentrations. Experimental observation shows that the rate is first order with rate law: -d[Mn+] /dt = kf[Mn+][SPy-]; and is proportional to [Mn+], [HSPy] and [H+]-1; where Mn+ = Mn2+, La3+ and Zr3+. The rate constants, kf were determined to be 0.8324 min-1 for Mn2+, 0.9977 min-1 for La3+ and 0.9971 min-1 for Zr3+; the order of rates of extraction for the metals being La3+ > Zr3+ > Mn2+. This suggests that the rates increase with larger size and higher ionic charges. The mechanism was proposed in which the rate-determining step is the formation of the first chelate ring of the mono-pyrazolonato metal complex; [Mn(H2O)4(SPy)]+; [La(H2O)4SPy]2+ and [Zr(H2O)4SPy]2+.

Keywords:

Kinetics, Mechanism, Solvent extraction, Acylpyrazolones, Formation constant, Metals.

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