Atmospheric-pressure air microplasma jets in aqueous media for the inactivation of <i>Pseudomonas fluorescens</i> cells

Zhang, Xianhui; Liu, Dongping; Song, Ying; Sun, Yue; Yang, Sui

doi:10.1063/1.4803190

Cited by 24 publications

(18 citation statements)

References 31 publications

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“…2 739. Briefly, the plasma device consists of 29 microplasma jet units housed in a glass cup (inner diameter: 50 mm).…”

Section: Methodsmentioning

confidence: 99%

“…Higher chemical reaction rates of thus-generated species translate to significantly improved killing efficacy, as demonstrated by efficient inactivation of Bacillus subtilis spores using a direct-current, cold atmospheric-pressure air plasma microjet generated in water6. Excellent plasma stability and extremely efficient killing of P. fluorescens cells within 5 min were reported for air microplasma produced in aqueous media by hollow-fiber based microplasma jets7.…”

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confidence: 99%

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Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media

Zhou

Zhang

et al. 2016

Sci Rep

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Atmospheric-pressure plasma and TiO2 photocatalysis have been widely investigated separately for the management and reduction of microorganisms in aqueous solutions. In this paper, the two methods were combined in order to achieve a more profound understanding of their interactions in disinfection of water contaminated by Escherichia coli. Under water discharges carried out by microplasma jet arrays can result in a rapid inactivation of E. coli cells. The inactivation efficiency is largely dependent on the feed gases used, the plasma treatment time, and the discharge power. Compared to atmospheric-pressure N2, He and air microplasma arrays, O2 microplasma had the highest activity against E. coli cells in aqueous solution, and showed >99.9% bacterial inactivation efficiency within 4 min. Addition of TiO2 photocatalytic film to the plasma discharge reactor significantly enhanced the inactivation efficiency of the O2 microplasma system, decreasing the time required to achieve 99.9% killing of E. coli cells to 1 min. This may be attributed to the enhancement of ROS generation due to high catalytic activity and stability of the TiO2 photocatalyst in the combined plasma-TiO2 systems. Present work demonstrated the synergistic effect of the two agents, which can be correlated in order to maximize treatment efficiency.

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“…2 739. Briefly, the plasma device consists of 29 microplasma jet units housed in a glass cup (inner diameter: 50 mm).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media

Zhou

Zhang

et al. 2016

Sci Rep

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“…This could have been be due to the NO x generated in the microplasmas. They react with water and produce nitric and nitrate acids (7,16,28). The pH values of the solutions treated by using O 2 and He microplasma arrays slightly increase with increasing treatment time.…”

Section: Chemical Reaction Rate Model and Inactivation Efficiencymentioning

confidence: 99%

“…These species can dissolve in the aqueous solution and then react with E. coli cells. A large number of microbubbles are formed close to the ends of hollow-core fibers (16). The atmosphericpressure microplasmas are generated inside these microbubbles.…”

Section: Chemical Reaction Rate Model and Inactivation Efficiencymentioning

confidence: 99%

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Inactivation of Escherichia coli Cells in Aqueous Solution by Atmospheric-Pressure N ₂ , He, Air, and O ₂ Microplasmas

Zhou

Zhang

et al. 2015

Appl Environ Microbiol

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bAtmospheric-pressure N 2 , He, air, and O 2 microplasma arrays have been used to inactivate Escherichia coli cells suspended in aqueous solution. Measurements show that the efficiency of inactivation of E. coli cells is strongly dependent on the feed gases used, the plasma treatment time, and the discharge power. Compared to atmospheric-pressure N 2 and He microplasma arrays, air and O 2 microplasma arrays may be utilized to more efficiently kill E. coli cells in aqueous solution. The efficiencies of inactivation of E. coli cells in water can be well described by using the chemical reaction rate model, where reactive oxygen species play a crucial role in the inactivation process. Analysis indicates that plasma-generated reactive species can react with E. coli cells in water by direct or indirect interactions.Plasma, called the fourth fundamental state of matter, in addition to solids, liquids, and gases, consists of equal numbers of positive ions and negative electrons (negative ions in some cases) and other reactive species, generally resulting from the ionization of neutral gases. Due to the reactive species in plasma, gas-based reactive plasmas are thought to be effective in killing various microorganisms (1-3). Therefore, recently, the inactivation of microorganisms in water by atmospheric-pressure cold plasmas (APCP) has attracted great attention for biomedical and environmental applications due to their lethal effects on bacteria and fungi (4-8), since APCP include many reactive species similar to those in the conventional methods of microorganism inactivation, such as ozone generation (9), UV irradiation (10), chemical agents (11), electrical fields (12, 13), and microwave irradiation (14).The chemical reaction rates of these plasma-activated species may be improved greatly when atmospheric-pressure nonequilibrium plasmas are generated in water (4-7, 15). These short-lived species can be formed in the vicinity of microorganisms and efficiently kill microorganisms in water. Usually, it is relatively hard to generate stable atmospheric-pressure plasmas in water. Among various plasma sources (4, 5, 7), atmospheric-pressure arc discharge has frequently been used for killing microorganisms in water. Compared to other sources, the strong arc discharges are less influenced by the aqueous environment while obviously leading to an increase in the water temperature with high energy consumption. This arc discharge can also cause serious damage to heat-sensitive materials, and the volume of treated aqueous solution is limited, since the arc plasma is usually controllable only in a small processing space.Previously (16), we designed an atmospheric-pressure air microplasma array to inactivate Pseudomonas fluorescens cells in aqueous media. The microplasma produced by hollow-fiberbased microplasma jets is stable and extremely efficient in killing P. fluorescens cells in aqueous media. This design demonstrates potential application for large-volume plasma inactivation of bacterial cells in water. In this study, we repor...

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On the Mechanism of Ring‐Shape Structure of Plasma Bullet

Xian

Yue

Liu

et al. 2014

Plasma Processes & Polymers

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Ring-shape is one of the feature characteristics of plasma bullet. However, regarding the mechanism of the ring-shape structure of the plasma bullet, it is still not clear. In this paper, a series of special designed experiments are carried out to investigate the mechanism of the ring-shape structure of the plasma bullet. In these experiments, the effects of the surface discharge and the effect of the surrounding gas diffusion, thus the effect of Penning ionization can be separated. It is found that both the diffusion of the surrounding air and the surface discharge play important role in the forming of the ringshape structure.

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Atmospheric-pressure air microplasma jets in aqueous media for the inactivation of Pseudomonas fluorescens cells

Cited by 24 publications

References 31 publications

Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media

Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media

Inactivation of Escherichia coli Cells in Aqueous Solution by Atmospheric-Pressure N ₂ , He, Air, and O ₂ Microplasmas

On the Mechanism of Ring‐Shape Structure of Plasma Bullet

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Atmospheric-pressure air microplasma jets in aqueous media for the inactivation of Pseudomonas fluorescens cells

Cited by 24 publications

References 31 publications

Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media

Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media

Inactivation of Escherichia coli Cells in Aqueous Solution by Atmospheric-Pressure N 2 , He, Air, and O 2 Microplasmas

On the Mechanism of Ring‐Shape Structure of Plasma Bullet

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Inactivation of Escherichia coli Cells in Aqueous Solution by Atmospheric-Pressure N ₂ , He, Air, and O ₂ Microplasmas