Decomposition of Crystal Violet by an Atmospheric Pressure RF Plasma Jet

The Role of Radicals, Ozone, Near-Interfacial Reactions and Convective Transport

H. Taghvaei, V. S.S.K. Kondeti, Peter J Bruggeman

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Cold atmospheric pressure plasma (CAP) oxidizes organic compounds in water through the generation of a variety of reactive species including O3 and OH radicals. While the energy efficiency and rate of decomposition of the chemical compound in water is already extensively studied, only few studies focused on the reactive species responsible for the decomposition. We report on an investigation of the chemical reactive species involved in the decomposition of crystal violet (CV), a model organic compound, by an RF driven plasma jet in different gas mixtures. Different gas mixtures lead to different concentrations of reactive species responsible for the decolorization of CV. Moreover, the effect of transport limitations on the efficiency of the plasma treatment is reported. A study of positive control measurements, the effect of scavengers of relevant reactive species and particle imaging velocimetry reveal the dominant role of short-lived species at the plasma–liquid interface in which OH most likely plays an important role. Moreover, the decolorization rate is limited by transport of CV to the near boundary region. The results suggest that for the optimization of water treatment by the short-lived species generated by a plasma, an optimum transport of the to-be-treated compounds to the interface might be more critical than effective reactive species production in the plasma.

Original languageEnglish (US)
Pages (from-to)729-749
Number of pages21
JournalPlasma Chemistry and Plasma Processing
Volume39
Issue number4
DOIs
StatePublished - Jul 15 2019

Fingerprint

Gentian Violet
Plasma jets
Ozone
Surface chemistry
plasma jets
ozone
Atmospheric pressure
atmospheric pressure
Decomposition
Plasmas
decomposition
Crystals
organic compounds
Organic compounds
Gas mixtures
crystals
gas mixtures
chemical compounds
Chemical compounds
water treatment

Keywords

  • Atmospheric pressure plasma
  • Crystal violet
  • Hydroxyl radical
  • Plasma–liquid interaction
  • Water treatment

Cite this

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abstract = "Cold atmospheric pressure plasma (CAP) oxidizes organic compounds in water through the generation of a variety of reactive species including O3 and OH radicals. While the energy efficiency and rate of decomposition of the chemical compound in water is already extensively studied, only few studies focused on the reactive species responsible for the decomposition. We report on an investigation of the chemical reactive species involved in the decomposition of crystal violet (CV), a model organic compound, by an RF driven plasma jet in different gas mixtures. Different gas mixtures lead to different concentrations of reactive species responsible for the decolorization of CV. Moreover, the effect of transport limitations on the efficiency of the plasma treatment is reported. A study of positive control measurements, the effect of scavengers of relevant reactive species and particle imaging velocimetry reveal the dominant role of short-lived species at the plasma–liquid interface in which OH most likely plays an important role. Moreover, the decolorization rate is limited by transport of CV to the near boundary region. The results suggest that for the optimization of water treatment by the short-lived species generated by a plasma, an optimum transport of the to-be-treated compounds to the interface might be more critical than effective reactive species production in the plasma.",
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