Nanosecond Pulsed Plasma Discharge in Oxygen–Water Mixture: Effect of Discharge Parameters on Pre- and Post-Breakdown Characteristics

Farooq, Muhammad; Ijaz, Usama; Anjum, Zakia; Rehman, N. U.

doi:10.1109/tps.2022.3161072

Cited by 5 publications

(3 citation statements)

References 54 publications

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“…However, at low frequency (used in this study), one can measure the electric field using Laplacian ( E = −∇ v /∇ r ) as a first approximation. The same is used to estimate the electron density using physical electrical measurement as N normale = J μ normale e E where N e is electron number density, J is current density, μ e is the mobility of electrons, e is a charge on the electron, and E is the electric field . The variation of electron number density with different applied voltages and molecular gas content is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…The same is used to estimate the electron density using physical electrical measurement as where N e is electron number density, J is current density, μ e is the mobility of electrons, e is a charge on the electron, and E is the electric field. 76 The variation of electron number density with different applied voltages and molecular gas content is shown in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

“…where N e is electron number density, J is current density, μ e is the mobility of electrons, e is a charge on the electron, and E is the electric field. 76 The variation of electron number density with different applied voltages and molecular gas content is shown in Figure 6. It is clear from Figure 6 that the number density increases with an increase in applied voltage and decreases with increasing molecular gas concentration.…”

Section: ■ Experimental Setupmentioning

confidence: 99%

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Metrology of Ar–N₂/O₂ Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

et al. 2023

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Atmospheric pressure plasma jets are gaining a lot of attention due to their widespread applications in the field of bio-decontamination, polymer modification, material processing, deposition of thin film, and nanoparticle fabrication. Herein, we are reporting the disinfection of Pseudomonas aeruginosa, Staphylococcus aureus, and Escherichia coli bacteria using plasma jet. In this regard, Ar–O2, Ar–N2, and Ar–O2–N2 mixture plasma is generated and characterized using optical and electrical characterization. Variation in plasma parameters like electron temperature, electron density, and reactive species production is monitored with discharge parameters such as applied voltage and feed gas concentration. Results show that the peak average power consumed in Ar–O2, Ar–N2, and Ar–O2–N2 mixture plasma is found to be 4.45, 2.93, and 4.35 W respectively, at 8 kV. Moreover, it is noted that by increasing applied voltage, the electron temperature, electron density, and reactive species production also increases. It is worth noting that electron temperature increases with increase in oxygen concentration in the mixture ( , while it decreases with increase in nitrogen concentration in the mixture (Ar–N2). Similarly, a decreasing trend in electron temperature is noted for Ar–O2–N2 mixture plasma. On the other hand, a decreasing trend in electron density is noted for all the mixtures. Reduction in viable colonies of Pseudomonas aeruginosa, Staphylococcus Aureus, and Escherichia coli were confirmed by the serial dilution method. The inactivation efficiency of pulsed DC plasma generated, in the Ar–N2 mixture at 8 kV and 6 KHz, was evaluated against P. aeruginosa, S. aureus and E. coli bacteria by measuring the number of surviving cells versus plasma treatment time. Results showed that after 240 s of plasma treatment, the number of survival colonies of the mentioned bacteria was reduced to less than 30 CFU/mL.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Setupmentioning

confidence: 99%

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Metrology of Ar–N₂/O₂ Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

et al. 2023

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Efficacy of Plasma Enhanced Advanced Oxidation Processes for Decontamination of Water Containing Arsenic

Farooq,

Rasheed,

Rehman

2023

Plasma Chem Plasma Process

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Nanosecond pulsed plasma discharge for remediation of simulated wastewater containing thiazine and azo dyes as model pollutants

Farooq

Ismail

Rehman

2022

Journal of Vacuum Science &Amp; Technology A

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Plasmas generated over and under the surface of water have immense scope for wastewater remediation due to in situ generation of redox-rich species. Remediation of simulated wastewater using underwater plasma discharge is reported in this paper. During the plasma discharge, an increase in energy coupling from source to discharge channel was noted with an increase in the applied pulsed DC voltage from [Formula: see text] to [Formula: see text]. Higher energy coupling resulted in elevation of gas temperature and electron temperature. Concentrations of hydroxyl radicals and hydrogen peroxide, estimated spectrochemically in effluent water, also increased with the applied voltage. On the other hand, ozone concentration showed a decreasing trend with increasing applied voltage and the peak ozone density was obtained at the lower end of the applied voltage, i.e., at [Formula: see text]. With higher energy dissipation, a pronounced discharge and, hence, greater emission intensities of ultraviolet radiation, atomic oxygen, and atomic hydrogen were observed in discharge spectra. The oxidative-reductive stress produced by underwater discharge resulted in a degradation efficiency of [Formula: see text] for methylene blue solution (thiazine dye) corresponding to energy yields of [Formula: see text]. Similarly, the degradation efficiency of [Formula: see text] for methyl orange solution (azo dye) with an energy yield of [Formula: see text] was achieved with this discharge. From the considerations of collision theory, activation energies of [Formula: see text] for methylene blue and [Formula: see text] for methyl orange degradation were estimated for the plasma discharge. Fourier-transform infrared spectroscopy was utilized to further reveal the possible effects of plasma therapy on different bonds of the dyes. Additionally, gas chromatography mass spectrometry analyses were used to suggest the possible degradation pathways of the two dyes. Instant dye degradation in flowing samples was compared with contemporary dye degradation results listed in literature to show the effectiveness of the used technique.

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Nanosecond Pulsed Plasma Discharge in Oxygen–Water Mixture: Effect of Discharge Parameters on Pre- and Post-Breakdown Characteristics

Cited by 5 publications

References 54 publications

Metrology of Ar–N₂/O₂ Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

Metrology of Ar–N₂/O₂ Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

Efficacy of Plasma Enhanced Advanced Oxidation Processes for Decontamination of Water Containing Arsenic

Nanosecond pulsed plasma discharge for remediation of simulated wastewater containing thiazine and azo dyes as model pollutants

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Nanosecond Pulsed Plasma Discharge in Oxygen–Water Mixture: Effect of Discharge Parameters on Pre- and Post-Breakdown Characteristics

Cited by 5 publications

References 54 publications

Metrology of Ar–N2/O2 Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

Metrology of Ar–N2/O2 Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

Efficacy of Plasma Enhanced Advanced Oxidation Processes for Decontamination of Water Containing Arsenic

Nanosecond pulsed plasma discharge for remediation of simulated wastewater containing thiazine and azo dyes as model pollutants

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Product

Resources

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Metrology of Ar–N₂/O₂ Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination

Metrology of Ar–N₂/O₂ Mixture Atmospheric Pressure Pulsed DC Jet Plasma and its Application in Bio-Decontamination