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Degradation of Methylene Blue by RF Plasma in Water

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Abstract

Radio frequency (RF) plasma in water was used for the degradation of methylene blue. The fraction of decomposition of methylene blue and the intensity of the spectral line from OH radical increased with RF power. RF plasma in water also produced hydrogen peroxide. The density of hydrogen peroxide increased with RF power and exposure time. When pure water (300 mL) is exposed to plasma at 310 W for 15 min, density of hydrogen peroxide reaches to 120 mg/L. Methylene blue after exposed to plasma degraded gradually for three weeks. This degradation may be due to chemical processes via hydrogen peroxide and tungsten. The comparison between the experimental and calculated spectral lines of OH radical (A–X) shows that the temperature of the radical is around 3,500 K. Electron density is evaluated to be ≃3.5 × 1020 m−3 from the stark broadening of the Hβ line.

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Acknowledgements

The present work was partially supported by Grants-in Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan (No. 17654118) (T. Maehara) and (No. 17560636) (H. Toyota). The authors thank Mr. H. Okumura for technical support.

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Author notes

  1. A. Iwamae

    Present address: ITER Diagnostics Group, Division of ITER Project, Japan Atomic Energy Agency, Ibaraki, 311-0193, Japan

Authors and Affiliations

  1. Graduate School of Science and Engineering, Ehime University, Matsuyama, 790-8577, Japan

    T. Maehara, I. Miyamoto, K. Kurokawa, Y. Hashimoto, H. Yamashita, S. Mukasa, H. Toyota & S. Nomura

  2. Graduate School of Engineering, Kyoto University, Kyoto, 606-8501, Japan

    A. Iwamae

  3. Integrated Center for Science, Ehime University, Matsuyama, 790-8577, Japan

    M. Kuramoto

  4. Faculty of Agriculture, Ehime University, Matsuyama, 790-8566, Japan

    A. Kawashima

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  1. T. Maehara
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  2. I. Miyamoto
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  3. K. Kurokawa
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  4. Y. Hashimoto
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  7. H. Yamashita
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  8. S. Mukasa
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  9. H. Toyota
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  10. S. Nomura
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Correspondence to T. Maehara.

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Maehara, T., Miyamoto, I., Kurokawa, K. et al. Degradation of Methylene Blue by RF Plasma in Water. Plasma Chem Plasma Process 28, 467–482 (2008). https://doi.org/10.1007/s11090-008-9142-2

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  • DOI: https://doi.org/10.1007/s11090-008-9142-2

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