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Comparison Study of Dimensionally Stable Anodes for Degradation of Chlorpyrifos in Water


Affiliations
1 Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka
2 Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, India
3 Department of Chemical and Process Engineering, University of Peradeniya, Sri Lanka
 

In the present study, two dimensionally stable anodes, Ti/IrO2 and Ti/IrO2-SnO2, have been developed in order to degrade chlorpyrifos in chloride-free environment. The chemical oxygen demand (COD) results revealed that Ti/IrO2-SnO2 electrode had degraded 78.2% of COD after 6 h of electrolysis. COD removal followed pseudo second-order kinetics. Radical scavenger studies confirmed that the hydroxyl radical can be the major factor responsible for degrading chlorpyrifos. The anodic charge decreased from 153.76 to 145.15 mC while accelerated lifetime showed 7 h increment, indicating the higher stability of Ti/IrO2- SnO2 anode. The qualitative identification of oxides of both electrodes was studied by X-ray diffraction. Roughness parameters and topography were determined using AFM images.

Keywords

Chlorpyrifos, Chloride Free Environment, Dimensionally Stable Anode.
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  • Comparison Study of Dimensionally Stable Anodes for Degradation of Chlorpyrifos in Water

Abstract Views: 382  |  PDF Views: 146

Authors

Gayani Chathurika Pathiraja
Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka
Pavithra Bhakthi Jayathilaka
Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka
Chandima Weerakkody
Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, India
Parakrama Karunarathne
Department of Chemical and Process Engineering, University of Peradeniya, Sri Lanka
Nadeeshani Nanayakkara
Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, India

Abstract


In the present study, two dimensionally stable anodes, Ti/IrO2 and Ti/IrO2-SnO2, have been developed in order to degrade chlorpyrifos in chloride-free environment. The chemical oxygen demand (COD) results revealed that Ti/IrO2-SnO2 electrode had degraded 78.2% of COD after 6 h of electrolysis. COD removal followed pseudo second-order kinetics. Radical scavenger studies confirmed that the hydroxyl radical can be the major factor responsible for degrading chlorpyrifos. The anodic charge decreased from 153.76 to 145.15 mC while accelerated lifetime showed 7 h increment, indicating the higher stability of Ti/IrO2- SnO2 anode. The qualitative identification of oxides of both electrodes was studied by X-ray diffraction. Roughness parameters and topography were determined using AFM images.

Keywords


Chlorpyrifos, Chloride Free Environment, Dimensionally Stable Anode.



DOI: https://doi.org/10.18520/cs%2Fv107%2Fi2%2F219-226