Mechanism of pH variation and H2O2 generation in water exposed to pulsed discharge plasma

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  • Mechanism of pH Variation and H<sub>2</sub>O<sub>2</sub> Generation in Water Exposed to Pulsed Discharge Plasma

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Positive and negative pulsed discharge plasma is generated above test liquid containing NaCl in Ar atmosphere, and the spatiotemporal variation of pH value in the liquid is visualized by a colorimetric method using bromothymol blue. Furthermore, polarity effects on H 2 O 2 generation are examined by electrochemical calculation and a colorimetric method using titanium sulfate. When the positive pulsed discharge plasma is generated, the pH value of the liquid is decreased by H + generation through the dissociation of H 2 O +, formed by the charge exchange reaction between Ar + and H 2 O, while the pH value of the vicinity of an earthed electrode is increased by OH - generation through the electrolysis of water. When the negative pulsed discharge plasma is generated, the pH value of the liquid is increased by OH - generation and H + reduction, respectively, through the reaction of hydrated electrons with H 2 O and H +, while the pH value in the vicinity of the earthed electrode is decreased by H + generation through the electrolysis of water. The generation of H 2 O 2 is found to be promoted when the positive pulsed discharge plasma is generated, and this increase rate of H 2 O 2 is in approximate agreement with the calculated generation rate of H 2 O 2, which is produced from OH generated by electrolysis.

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