Abstract
In this study, the decolorization ratio of methyl violet and energy consumption were individually investigated in dielectric barrier discharges of O2, He, and He + O2 gases. The results showed that the highest decolorization ratio was achieved in the O2 gas discharge, followed by the He + O2 and He gas discharges, and the decolorization was almost the same in the He + O2 and O2 gas discharges. For the He gas discharge, the energy consumption was lowest but the decolorization ratio was also lower than 50%. For the O2 gas discharge, a decolorization ratio of 99.5% was achieved but a high energy density of 32.5 kJ/L was required. For the He + O2 discharge, a decolorization ratio of 96% was achieved and the required energy density was only 7.7 kJ/L. Therefore, from the experimental results, the discharge in a mixture of He + O2 gases is optimal for the decolorization of methyl violet. When He is mixed into O2, a high decolorization ratio can be achieved and a low energy density is required.
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