Photo-Electrocatalytic Degradation of Aqueous Rhodamine-B Dye using Titanium Electrodes Coated with RuO2/IrO2/TaO2

IJEP 42(3): 328-335 : Vol. 42 Issue. 3 (March 2022)

R. Rathinam1*, T. Brindha2, M. Petchiammal3 and A. Mohamed Ibrahim4

1. Sri Eshwar College of Engineering, Department of Chemistry, Coimbatore – 641 202, Tamil Nadu, India
2. Karpagam Academy of Higher Education, Department of Chemistry, Faculty of Engineering, Coimbatore -641 021, Tamil Nadu, India
3. Karpagam Institute of Technology, Department of Chemistry, Coimbatore – 641 105, Tamil Nadu, India
4. Hindustan College of Engineering and Technology, Department of Chemistry, Coimbatore – 641 032, Tamil Nadu, India


This work is focused on the study of photo-electrocatalytic degradation of Rhodamine B (RhB) dye by RuO2/IrO2/TaO2 coated titanium electrodes. Combining electrochemical and photo-catalysis technologies called photo-electrocatalytic technology offers the opportunity to separate electron–hole, photo-generated and promote the formation of highly reactive, oxidising species that contribute e-/h+ and to prevent their recombination. Experiment was carried out with various operating parameters, such as initial pH, applied current density, dye concentration, supporting electrolyte concentration, stirring speed and treatment time. The experimental results revealed that the colour removal increases with increase in current density and NaCl concentration, while it was found to decrease with the increase in initial dye concentration. Under the neutral medium, the decolourization efficiency reached  100% in 30 min of electrolysis time. The pH was found to be an important parameter for the process, the maximum efficiency of colour removal was achieved at pH 7.0. The GC-MS confirms the degradation of Rhodamine B from aqueous solution.


Photo-electrocatalytic oxidation, Rhodamine B dye, RuO2/IrO2/TaO2 coated titanium electrode, Colour removal


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