Decolorization of Methylene Blue via Microsecond Pulsed Plasma in Atmospheric Gases
Keywords:
Non-thermal plasma, Pulsed corona discharge, Methylene blueAbstract
A novel vertical bubble reactor with microsecond plasma discharge was designed for methylene blue decolorization. The effect of changing the type of feed gas in the plasma reactor (air, oxygen, argon, and nitrogen) on the decolorization efficiency was investigated. All the feed gases achieved methylene blue decolorization higher than 95% within 30 min, while the energy required for 50% decolorization (Y50) was 1.415, 0.954, 0.786, and 0.586 g/kWh for oxygen, air, argon, and nitrogen, respectively. By fitting with ln(Ct/C0), the reaction time varied linearly with the reaction time, indicating that the decolorization reaction exhibited pseudo-first-order behavior. Finally, coumarin was used as an OH radical scavenger, demonstrating that OH radicals were the main active species in the decolorization reaction. These OH radicals may have been generated from ozone and hydrogen peroxide. Considering the economics and the decolorization efficiency, these results suggest that air is a promising feed gas candidate for methylene blue decolorization.
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