Analysis of Time-Resolved Plasma Jet Emissions That Drive Methylene Blue Dye Decomposition

Gott, Ryan; Thompson, Marisa; Staton, Brandon C.; Williams, Brandon M.; Xu, Kunning G.

doi:10.1109/tps.2021.3089852

Cited by 4 publications

(4 citation statements)

References 40 publications

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“…14 RhB degradation rate as a function of gas flowrate for 0.2 mM RhB solution. Experimental conditions: 5 LPM argon gas flowrate, 1000 rpm rotational speed, and 5 W discharge power Figure 14 shows the degradation rates of 0.2 mM RhB for different gas flowrates, which generally show an increase in removal with flowrate as reported previously in literature [45,47]. However, the trend observed in Figure 14 does not quite follow that of hydrogen peroxide observed in Figure 13, which could be explained by a transition from laminar to turbulent gas flow that occurs as the gas flowrate increases from 2 LPM (Re = 1171) to 10 LPM (Re = 5857).…”

Section: The Effect Of Gas Flowrate On the Reactor Performancesupporting

confidence: 64%

“…Gas flowrate did not affect the discharge power (data not shown). The increase in H2O2 production rates with gas flowrate could be attributed to the increased water vapor content in the gas phase, which could have originated from either the humid gas or from the evaporation or sputtering induced by the (turbulent) gas flow [25,28,45]. High gas velocities could also reduce OH radical losses and enhance H2O2 formation by minimizing mixing between the plasma plume and surrounding residual air [46].…”

Section: The Effect Of Gas Flowrate On the Reactor Performancementioning

confidence: 99%

“…The interfacial concentration of RhB was represented by its equilibrium surface excess, Γ, which depends on the underlying subsurface RhB concentration. Therefore, by assuming mass flux continuity between the subsurface and interface, a relation between the surface excess concentration of RhB at the interface a subsurface RhB concentration can be established [45]:…”

Section: Residence Time and Dye Degradation Ratementioning

confidence: 99%

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Characterization and Treatment Performance of an Atmospheric Pressure Plasma Jet-Operated Spinning Disc Reactor for the Treatment of Rhodamine B Dye

Ganzallo,

Su,

Yatom

et al. 2023

Plasma Chem Plasma Process

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A spinning disc reactor is a design widely adopted in chemical process industries because of its capability to produce thin fast-moving films, which enhance the diffusive and convective transport of solutes.However, this configuration has yet to be explored for plasma-based water treatment, where mass transport limitations in the bulk liquid often limit reactor degradation efficiency. This study presents a novel plasma spinning disc reactor (PSDR) for degrading rhodamine B dye and characterizes its performance. The impact of discharge power, gas flowrate, liquid flowrate, disc rotational speed, and bulk liquid concentration on dye degradation was investigated. The results indicate that mass transport limitations within the fluid were the primary limitation to efficient degradation. Higher degradation rates were achieved primarily through changes in the plasma area, fluid velocity across the disc, and increased bulk liquid concentration, resulting in enhanced contact between the solute and the plasma. Residence time, a function of plasma area and fluid velocity, was used to describe and predict degradation rates on the PSDR using a 1-D fluid element model, which indicated that lower residence times favored dye degradation, especially for systems limited by small plasma areas.

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Section: The Effect Of Gas Flowrate On the Reactor Performancesupporting

confidence: 64%

Section: The Effect Of Gas Flowrate On the Reactor Performancementioning

confidence: 99%

Section: Residence Time and Dye Degradation Ratementioning

confidence: 99%

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Characterization and Treatment Performance of an Atmospheric Pressure Plasma Jet-Operated Spinning Disc Reactor for the Treatment of Rhodamine B Dye

Ganzallo,

Su,

Yatom

et al. 2023

Plasma Chem Plasma Process

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show abstract

“…In another commonly used configuration, a single dielectric material separates the HV and the ground electrode [11,16]. Both configurations of the plasma jets have been studied for different applications including biomedicine and water purification [17][18][19][20][21]. Despite the scale of their applications, there is considerable ambiguity as to their relative characteristics and merits for the aforementioned applications, thus making direct comparisons between studies difficult.…”

Section: Introductionmentioning

confidence: 99%

Contrasting the characteristics of atmospheric pressure plasma jets operated with single and double dielectric material: physicochemical characteristics and application to bacterial killing

Ghimire¹,

Briggs²,

Sysoeva³

et al. 2023

J. Phys. D: Appl. Phys.

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This study reports an experimental study of two types of plasma jets in terms of their fundamental plasma characteristics and efficacy in bacterial sterilization. The plasma jets are fabricated by inserting a high voltage electrode inside a one-end closed (double DBD plasma jet) or both ends open (single DBD plasma jet) quartz tubes which are further enclosed inside a second quartz tube containing a ground electrode. Both plasma jets are operated in contact with water surface by using a unipolar pulsed DC power supply with helium as the working gas. Results from electrical and time-resolved imaging show that the single DBD configuration induces 3-4 times higher accumulation of charges onto the water surface with significantly faster propagation of plasma bullets. These results are accompanied by the higher discharge intensity as well as stronger emissions from short-lived reactive species which were analyzed through optical emission spectroscopy at the plasma-water interface. The rotational temperature for the single DBD configuration was observed to be higher making it unsafe for direct treatments of sensitive biological targets. These characteristics of the single DBD configuration result in the production of more than two times higher concentration of H$_2$O$_2$ in plasma activated water. Our results suggest that the shielding of the HV electrode reduces the plasma potential which in turn reduces the electric field \& electron energy at the plasma-water interface. The reduced electric field for the double DBD configuration was lower by $\approx$463Td than the single DBD configuration. The bactericidal efficacy of the two configurations of the plasma jets were tested against \textit{Escherichia coli}, a well studied Gram-negative bacterium that can be commensal and pathogenic in human body. Our results demonstrate that although single DBD plasma jet result in stronger antibacterial effects, the double DBD configuration could be safer.

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Plasma for Crewed Transit and Planetary Habitation: Research Efforts at Kennedy Space Center

Engeling

Gott

2023

IEEE Trans. Plasma Sci.

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Analysis of Time-Resolved Plasma Jet Emissions That Drive Methylene Blue Dye Decomposition

Cited by 4 publications

References 40 publications

Characterization and Treatment Performance of an Atmospheric Pressure Plasma Jet-Operated Spinning Disc Reactor for the Treatment of Rhodamine B Dye

Characterization and Treatment Performance of an Atmospheric Pressure Plasma Jet-Operated Spinning Disc Reactor for the Treatment of Rhodamine B Dye

Contrasting the characteristics of atmospheric pressure plasma jets operated with single and double dielectric material: physicochemical characteristics and application to bacterial killing

Plasma for Crewed Transit and Planetary Habitation: Research Efforts at Kennedy Space Center

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