LIQUID-LIQUID SOLVENT EXTRACTION OF FE (III) USING 1, 5-DIMETHYL- 2-PHENYL-4-[(E)-(2,3,4-TRIHYDROXYLPHENYL)DIAZENYL]-1,2-DIHYDRO-3H-PYRAZOL-3-ONE.

I.J. Opara, P.O. Ukoha, N.R. Ekere

Abstract


The work reports the synthesis and use of an azo ligand, 1,5-dimethyl- 2- phenyl-4-[(E)-(2,3,4-trihydroxylphenyl) diazenyl]- 1,2-dihydro-3H-pyrazol-3-one (H3L) in solvent extraction studies of its Iron (III) complex. Extraction studies at pH range 1-13, indicates that quantitative extraction of Fe (III) using 8.0×10-3   % H3L/CH2Cl2 is observed at pH 6. Fe(III) was quantitatively extracted at pH 6 up to 98.75%  as well as  in 0.001 M HClO4 up to 96.25% within five minutes. Extraction up to 96.25 % was observed with 10-3 MHClO4 and it was observed that as the concentration of various mineral acids increases the amount extracted decreases. 10-3 M KClO4 and Na2SO4 proved to be good salting out agents for the extraction of Fe (III). The ligand has potentials for use in large scale environmental clean-up of iron overload and other analytical determinations of Iron (III) ions.

 Keywords:  Iron (III), liquid-liquid, extraction, chelation, H3L, synthesis, ligand, spectrophotometry


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Chemical Society of Nigeria