Investigation of RONS Production and Complex Molecules Degradation Induced by an APPJ Generated by Two Different Sources

Invernizzi, Laurent; Muja, Cristina; Sainct, Florent P.; Guillot, Philippe

doi:10.1109/trpms.2019.2918623

Cited by 9 publications

(10 citation statements)

References 44 publications

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“…Atmospheric pressure discharges can achieve the needs of many applications through the control of the plasma chemistry [1][2][3][4][5][6][7][8][9][10][11]. This control can be approached by source design, feed gas control or voltage waveform choices.…”

Section: Introductionmentioning

confidence: 99%

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H₂O at atmospheric pressure

Brisset

Harris

Dickenson

et al. 2022

Plasma Sources Sci. Technol.

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Control of the plasma chemistry is essential for the effectiveness of atmospheric pressure plasmas in many applications. For this, the effects of the humidity of the feed gas on the discharge chemistry need to be considered. Detailed studies are scarce and many of them are dominated by surface interactions, obscuring any volume effects. Here, a negative nanosecond pulsed discharge is generated in a pin-pin 3 mm gap geometry in He+H2O that enables the study of volume kinetics due to minimal surface area. The effect of humidity on the discharge development, electric field and electron density is investigated through experiments and modelling. It is found that the presence of water vapour affects both the electron density at the start of the pulse (remaining from the previous pulse) and the ionisation rates during the ignition phase, leading to a complex dependence of the discharge development speed depending on the water concentration. The electron decay is studied using the 0D global kinetics model GlobalKin. The dominant reactions responsible for the electron decay depending on the concentration of water vapour are determined by comparing experimental and simulated results and these reactions are grouped in simplified kinetic models. It is found that with water concentrations increasing from 0 to 2500 ppm, the complexity of the dominant reactions increases with in particular O2 +, H2O3 + and water clusters becoming important for high water concentrations. This work also provides experimental data for validation of kinetic models of plasmas in controlled environments.

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Section: Introductionmentioning

confidence: 99%

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H₂O at atmospheric pressure

Brisset

Harris

Dickenson

et al. 2022

Plasma Sources Sci. Technol.

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“…Non-equilibrium atmospheric-pressure plasmas are known to be efficient sources of reactive species [1][2][3][4][5][6][7][8][9][10][11][12][13] and have been investigated for several different applications, in particular surface processing, environmental applications and plasma medicine [7,. One of the challenges is tailoring the plasma gas-phase chemistry to each specific application.…”

Section: Introductionmentioning

confidence: 99%

“…For biomedical applications the emphasis has been on understanding and optimising the production of reactive oxygen and nitrogen species (RONS) due to their high oxidative power and their natural roles in major biological functions (in particular in the immune system, or as signalling molecules in cellular functions [1,3,4,16,23,24]). In the presence of water, which can come from the biological target, itself or may be intentionally introduced to the feed gas, hydrogen peroxide (H2O2) attracts particular attention.…”

Section: Introductionmentioning

confidence: 99%

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

Brisset

Gibson

Schröter

et al. 2021

J. Phys. D: Appl. Phys.

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This work presents experiments and modelling of OH densities in a radio-frequency driven atmospheric-pressure plasma in a plane-parallel geometry, operated in helium with small admixtures of oxygen and water vapour (He+O2+H2O). The density of OH is measured under a wide range of conditions by absorption spectroscopy, using an ultra-stable laser-driven broad-band light source. These measurements are compared with 0D plasma chemical kinetics simulations adapted for high levels of O2 (1%). Without O2 admixture, the measured density of OH increases from 1.0×10 14 to 4.0×10 14 cm -3 for H2O admixtures from 0.05% to 1%. The density of atomic oxygen is about 1×10 13 cm -3 and grows with humidity content. With O2 admixture, the OH density stays relatively constant, showing only a small maximum at 0.1% O2. The simulations predict that the atomic oxygen density is strongly increased by O2 addition. It reaches 10 15 cm -3 without humidity, but is limited to 10 14 cm -3 beyond 0.05% water content. The addition of O2 has a weak effect on the OH density because, while atomic oxygen becomes a dominant precursor for the formation of OH, it makes a nearly equal contribution to the loss processes of OH. The small increase in the density of OH with the addition of O2 is instead due to reaction pathways involving increased production of HO2 and O3. The simulations show that the densities of OH, O and O3 can be tailored relatively independently over a wide range of conditions. The densities of O and O3 are strongly affected by the presence of small quantities (0.05%) of water vapour, but further water addition has little effect. Therefore, a greater range and control of the reactive species mix from the plasma can be obtained by the use of well-controlled multiple gas admixtures, instead of relying on ambient air mixing.

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“…The configuration of the high-voltage electrode influences the energy yield of the discharge as well as the production of reactive species in the liquid phase. Moreover, it has been found that the energy efficiency of this type of plasma discharge improves by decreasing the distance between the electrode and the water surface [ 64 ]. It has been reported that the distance between the electrodes in the plasma reactor can determine the amount of ROS formed, which affects the degradation efficiency [ 65 ].…”

Section: Plasma Discharge and Chemistrymentioning

confidence: 99%

Degradation of Bacterial Antibiotic Resistance Genes during Exposure to Non-Thermal Atmospheric Pressure Plasma

Courti¹,

Muja²,

Maho³

et al. 2022

Antibiotics

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Bacterial resistance to antibiotics has become a major public health problem in recent years. The occurrence of antibiotics in the environment, especially in wastewater treatment plants, has contributed to the development of antibiotic-resistant bacteria (ARB) and the spread of antibiotic resistance genes (ARGs). Despite the potential of some conventional processes used in wastewater treatment plants, the removal of ARB and ARGs remains a challenge that requires further research and development of new technologies to avoid the release of emerging contaminants into aquatic environments. Non-thermal atmospheric pressure plasmas (NTAPPs) have gained a significant amount of interest for wastewater treatment due to their oxidizing potential. They have shown their effectiveness in the inactivation of a wide range of bacteria in several fields. In this review, we discuss the application of NTAPPs for the degradation of antibiotic resistance genes in wastewater treatment.

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Investigation of RONS Production and Complex Molecules Degradation Induced by an APPJ Generated by Two Different Sources

Cited by 9 publications

References 44 publications

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H₂O at atmospheric pressure

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H₂O at atmospheric pressure

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

Degradation of Bacterial Antibiotic Resistance Genes during Exposure to Non-Thermal Atmospheric Pressure Plasma

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Investigation of RONS Production and Complex Molecules Degradation Induced by an APPJ Generated by Two Different Sources

Cited by 9 publications

References 44 publications

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H2O at atmospheric pressure

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H2O at atmospheric pressure

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O2 + H2O radiofrequency plasma

Degradation of Bacterial Antibiotic Resistance Genes during Exposure to Non-Thermal Atmospheric Pressure Plasma

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Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H₂O at atmospheric pressure

Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H₂O at atmospheric pressure

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma