Kinetic study on the electrodecolorization of C.I. Acid Yellow 23

Subject Areas : Journal of Physical & Theoretical Chemistry

N. Modirshahla ¹ , M.A. Behnajady ² , S. Kooshaiian ³

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Received: 2015-04-25 Accepted : 2015-04-25 Published : 2007-08-01

Keywords: Keywords:Electrodecolorization, Electrocoagulation, Kinetic, Acid Yellow 23, Tartrazine, Iron electrode,

Abstract :

The electrocoagulation (EC) is a simple and efficient method for the treatment of many water and wastewaters.The kinetics of decolorization of Acid Yellow 23 by EC using iron electrodes was studied. Theelectrodecolorization rate follows pseudo-first order kinetic with respect to the AY23 concentration havingkapp= 5.65 cm min-1 at T= 295 K. The rate equation is as follows:ln [AY23]t ln [AY23]0 = -kapp2336 cm t250 cmThe pseudo-first order rate constant (kapp) is sensitive to the operational parameters. The kapp is low in bothhighly acidic and basic conditions. For the optimum operating conditions in electrodecolorization of AY23, theactivation energy was 41.15 kJ mol-1, sludge volume was about 8 ml from 250 ml of the original AY23 solution.The electrical energy consumption required for this treatment was 7.74 × 10-4 kW h and the electrodeconsumption was 37.4 mg.