Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Degradation of synthetic dye in water by solution plasma process

  • Panomsuwan, Gasidit (NU-PPC Plasma Chemical Technology Laboratory, The Petroleum and Petrochemical College, Chulalongkorn University) ;
  • Morishita, Tetsunori (Department of Materials, Physics and Energy Engineering, Nagoya university) ;
  • Kang, Jun (Division of Marine Engineering, Korea Marinetime and Ocean Engineering) ;
  • Rujiravanit, Ratana (The Petroleum and Petrochemical College, Chulalongkorn University) ;
  • Ueno, Tomonaga (Department of Materials, Physics and Energy Engineering, Nagoya university) ;
  • Saito, Nagahiro (Department of Materials, Physics and Energy Engineering, Nagoya university)
  • Received : 2016.11.23
  • Accepted : 2016.12.12
  • Published : 2016.12.31
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Abstract

In this study, the solution plasma process was utilized with the aim of degrading synthetic dyes in water at atmospheric pressure. The experiments were conducted in a batch-type reactor consisting of a symmetric wire-wire electrode configuration with rhodamine B (RhB) as the target synthetic dye. The effects of the plasma treatment time and initial dye concentration on the RhB degradation were investigated by monitoring the change in absorbance of RhB solutions. The RhB solutions turned lighter in color and finally colorless with prolonged plasma treatment time, indicating the destruction of dye molecules. The RhB solutions were found to have degraded, following the first-order kinetic process. However, for high initial RhB concentrations, another kinetic process or factor seems to play a dominant role at the initial degradation stage. The fitted first-order rate constant decreased as the initial concentration increased. This result suggests that the degradation behavior and kinetic process of the RhB solution strongly depends on its initial concentration. The RhB degradation is considered to be due to a combination of factors, including the formation of chemically oxidative species, as well as the emission of intense UV radiation and high-energy electrons from the plasma. We believe that the solution plasma process may prove to be an effective and environment-friendly method for the degradation or remediation of synthetic dye in wastewater.

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References

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