Oxidation-reduction reaction of chromium (VI) and iron (III) with paracetamol: Kinetics and Mechanistic studies

摘要

Kinetics of the oxidation of paracetamol (PCM),C8H9NO2,byCr (VI) and Fe (III) werecarried out in aqueous HNO3 (0.06 moldm-3) medium at ionic strength of 0.01 moldm-3 (NaNO3). Thestoichiometries of the reactions were determined to be 1:3 (Cr2O7 2-:C8H9NO2) and 2:1 (Fe3+ : C8H9NO2).Thereaction products were identified as sodium acetate, ammonium ions and benzoquinone. The following infrared stretching frequencies; υ(C=O),1623.15 cm-1 and 1644.37 cm-1; υ(C-H), 880.77 cm-1 and 875.71 cm-1 (out of plane bending); and υ(C=C), 474.63 cm-1 and 453.41 cm- 1wereobserved for the oxidized products of Cr(VI) and Fe(III), respectively.