Author/Authors :
Salim Reza Khan Muhammad نويسنده Department of Chemistry, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh , Abdul Motin Muhammad نويسنده Department of Chemistry, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh , Hafiz Mia Muhammad. A . نويسنده Department of Chemistry, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh , Matiar Rahman Muhammad نويسنده Department of Chemistry, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh , Abdul Aziz Muhammad نويسنده Department of Chemistry, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh , Abul Hasem Muhammad نويسنده Department of Leather Engineering, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh
Abstract :
The redox behavior of Fe(III) in presence of Catechol (Cc) has been carried out in
buffer solution of different pH, scan rate, variation of Fe(III) concentration and Cc
concentration. Uncoordinated Fe(III) or Cc has been found to undergo reversible electrode
reaction whereas coordinated Fe-Cc is irreversible. The peak positions of the voltammogram
of Fe- Cc shifted with respect to that of free Fe(III) or Cc and also developed a new peak at
0.12 V. The peak current of Fe-Cc decreases significantly compared with that of free Fe(III)
or Cc in the same experimental conditions. These behaviors ascribed the formation of
complex of Fe with Cc. The complex was formed either by the addition of Cc into Fe(III) or
by the addition of Fe(III) into Cc. The effect of pH of Fe-Cc complex was studied by varying
pH from 2 to 8.5. The electrochemical oxidation of Fe-Cc is facilitated in lower pH media.
The slope of the plots of anodic peak current, Ep against pH of Fe-Cc complex is 30 mV,
indicates that the oxidation of Fe-Cc complexes proceeded via the 2e?/2H+ processes. The
current functions (1/v-1/2) of the anodic peak of Fe-Cc decreased with the increasing of scan
rate demonstrated that the behavior of electrode reaction of Fe-Cc is of ECE type
