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 language | English (US) |
|---|---|
| Pages (from-to) | 729-749 |
| Number of pages | 21 |
| Journal | Plasma Chemistry and Plasma Processing |
| Volume | 39 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jul 15 2019 |
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Keywords
- Atmospheric pressure plasma
- Crystal violet
- Hydroxyl radical
- Plasma–liquid interaction
- Water treatment
Cite this
Decomposition of Crystal Violet by an Atmospheric Pressure RF Plasma Jet : The Role of Radicals, Ozone, Near-Interfacial Reactions and Convective Transport. / Taghvaei, H.; Kondeti, V. S.S.K.; Bruggeman, Peter J.
In: Plasma Chemistry and Plasma Processing, Vol. 39, No. 4, 15.07.2019, p. 729-749.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Decomposition of Crystal Violet by an Atmospheric Pressure RF Plasma Jet
T2 - The Role of Radicals, Ozone, Near-Interfacial Reactions and Convective Transport
AU - Taghvaei, H.
AU - Kondeti, V. S.S.K.
AU - Bruggeman, Peter J
PY - 2019/7/15
Y1 - 2019/7/15
N2 - 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.
AB - 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.
KW - Atmospheric pressure plasma
KW - Crystal violet
KW - Hydroxyl radical
KW - Plasma–liquid interaction
KW - Water treatment
UR - http://www.scopus.com/inward/record.url?scp=85061737921&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061737921&partnerID=8YFLogxK
U2 - 10.1007/s11090-019-09965-w
DO - 10.1007/s11090-019-09965-w
M3 - Article
VL - 39
SP - 729
EP - 749
JO - Plasma Chemistry and Plasma Processing
JF - Plasma Chemistry and Plasma Processing
SN - 0272-4324
IS - 4
ER -