Kinetics of Photo-Electro-Assisted Degradation of Remazol Red 5B
Kinetics of Photo-Electro-Assisted Degradation of Remazol Red 5B

Summary/Abstract: This research studies a kinetics of photo-electro-assisted degradation of dyes. The kinetics study applied the Buttler-Volmer kinetics for electro-assisted reaction in combination with the regular chemical kinetics for photodegradation. The result then being compared with the regular chemical kinetics application for both photo-electro-assisted degradation. The degradation cell was designed by separating the anodic and cathodic cell, in which the dye solution was placed in the anodic cell. As the solvent, water molecules, also be able to undergo electro-oxidation, therefore in this research pH of the solution was recorded during reaction whether in the anodic or cathodic cell. The result shows that oxidation of H2O occured in an anodic cell in competition with the dye oxidation. However, the dye oxidation proceeds faster than H2O oxidation. In which, the rate constant of dye oxidation is 2.7795 × 10-3. Meanwhile, the rate constant of H2O oxidation in the anodic cell is 7.9738 × 10-11. In addition, the study also found that the degradation cell undergoes polarization. It is indicated by the low value of the cathodic rate constant, i.e. 3.2805 × 10-10. The cathodic cell is only filled with water, therefore, the reducing species is only H2O molecules. The result also shows that Cu-TiO2/Graphite also has adsorption ability in which the dye molecules were adsorbed with adsorption constant of 5.56 ×10-2 ppm-1.

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