Degradation rate of Methyl Orange organic dye by high voltage spark plasma

Subject Areas : Water and Environment

faezeh rahimi ¹ , mahdi momeni ² , mansour arab chamjangali ³

1 - MSc of plasma physics, faculty of physics and nuclear engineering, Shahroud University of Technology, Semnan, Iran. *(Corresponding Author)
2 - Assistant Professor of plasma physics, faculty of physics and nuclear engineering, Shahroud University of Technology, Semnan, Iran.
3 - Professor of analytical chemistry, chemistry faculty, Shahroud University of Technology, Semnan, Iran.

Received: 2021-04-21 Accepted : 2021-12-10 Published : 2022-12-22

Keywords: Electrical discharge, decoloration, electrical characteristics, Atmospheric pressure plasma,

Abstract :

Background and Objective: One of the most important problems of modern society is water pollution.  Among these pollutants are organic dyes pollutant in industrial factories effluent, which the removal them is very important. The purpose of this study is to provide a solution to eliminate the methyl orange organic dye in industrial factories wastewater by Spark plasma. Material and Methodology: In this study, the decolorization and degradation of methyl orange solution were investigated by electrical discharge plasma method at the water-gas interface. The electrical discharge device used in the present work is spark type plasma with needle-plate electrode structure, with effective voltage 1-12 KV and constant frequency 13 KHz. Findings: The results show that decolorization and degradation of methyl orange dye solution begins at the air-gas-air interface, which can be due to ultraviolet radiation and production of OH radical and highly reactive species H2O2 at the air-gas interface. The effects of the discharge device parameters such as the applied voltage, electrode gap, treatment time and also chemical effects of the solution such as the concentration of the dye have a significant role on decolorization. The results showed that with increasing voltage and increasing treatment time, the amount of decolorization increases, and also by keep the electrical power of the device constant, the amount of decolorization decreases with increasing concentration. Selecting a distance of 2 cm between the electrodes, the highest amounts of decolorization in solution have been observed.    Discussion and Conclusion: In this reactor, the initial pH has no significant effect on decolorization efficiency. Also, the highest decolorization rate of 99.8% occurred at a concentration of 30 ppm, effective voltage 10 KV, electrode gap of 2 cm, initial pH = 3 and in 30 minutes treatment time.  

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