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

Abstract

The electrocoagulation (EC) is a simple and efficient method for the treatment of many water and wastewaters.<br />The kinetics of decolorization of Acid Yellow 23 by EC using iron electrodes was studied. The<br />electrodecolorization rate follows pseudo-first order kinetic with respect to the AY23 concentration having<br />kapp= 5.65 cm min-1 at T= 295 K. The rate equation is as follows:<br />ln [AY23]t – ln [AY23]0 = -kapp<br />2<br />3<br />36 cm t<br />250 cm<br />The pseudo-first order rate constant (kapp) is sensitive to the operational parameters. The kapp is low in both<br />highly acidic and basic conditions. For the optimum operating conditions in electrodecolorization of AY23, the<br />activation energy was 41.15 kJ mol-1, sludge volume was about 8 ml from 250 ml of the original AY23 solution.<br />The electrical energy consumption required for this treatment was 7.74 × 10-4 kW h and the electrode<br />consumption was 37.4 mg.