Experimental analysis reveals 99.39% methylene blue removal using tungsten–iron electrodes, suggesting electrode selection is crucial.
Low-voltage pulsed submerged arc (SA) plasma discharge is promising for water treatment due to its cost-effectiveness and high degradation efficiency. This study investigated methylene blue (MB) degradation with different electrode pairs, including graphite and iron as anodes, and iron, titanium, and tungsten as cathodes. A maximum removal ratio of 99.39% was achieved with a tungsten cathode and iron anode in 70 seconds. The experimental results indicated that electrode erosion might contributes to MB removal through adsorption and chemical reactions. Besides, the iron ion hydrolysis produced flocculent precipitates, which will further improve the MB degradation. This study provides insights into electrode material selection and the mechanisms influencing MB degradation.
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Mo et al. (2025) studied this question.
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