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Plasma Chemistry and Plasma Processing

, Volume 28, Issue 4, pp 467–482 | Cite as

Degradation of Methylene Blue by RF Plasma in Water

  • T. MaeharaEmail author
  • I. Miyamoto
  • K. Kurokawa
  • Y. Hashimoto
  • A. Iwamae
  • M. Kuramoto
  • H. Yamashita
  • S. Mukasa
  • H. Toyota
  • S. Nomura
  • A. Kawashima
Original Paper

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.

Keywords

Radio frequency plasma In water Degradation AOPs 

Notes

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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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • T. Maehara
    • 1
    Email author
  • I. Miyamoto
    • 1
  • K. Kurokawa
    • 1
  • Y. Hashimoto
    • 1
  • A. Iwamae
    • 2
    • 3
  • M. Kuramoto
    • 4
  • H. Yamashita
    • 1
  • S. Mukasa
    • 1
  • H. Toyota
    • 1
  • S. Nomura
    • 1
  • A. Kawashima
    • 5
  1. 1.Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan
  2. 2.Graduate School of EngineeringKyoto UniversityKyotoJapan
  3. 3.ITER Diagnostics Group, Division of ITER ProjectJapan Atomic Energy AgencyIbarakiJapan
  4. 4.Integrated Center for ScienceEhime UniversityMatsuyamaJapan
  5. 5.Faculty of AgricultureEhime UniversityMatsuyamaJapan

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