Repetitive pulsed gas–liquid discharge in different atmospheres: from discharge characteristics to plasma–liquid interactions

Lu, Xu; Zhang, Li; Wang, Sen; Fang, Zhi

doi:10.1039/d3cp01074k

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…The concentration of long-lived reactive species was quantified using a UV-vis spectrophotometer (Jinghua, UV1800, China), as previously described in references [24,25]. The degradation products at different treatment times are analyzed by liquid chromatography-mass spectrometry (LC-MS, Agilent, 1290UPLC/Q-TOF6550).…”

Section: Experimental Setup Of Plasma Source and Tetracycline Degrada...mentioning

confidence: 99%

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

WANG 王,

ZHOU 周,

WANG 王

et al. 2024

Plasma Sci. Technol.

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Plasma-catalysis is considered as one of the most promising technologies for antibiotic degradation in water. In the plasma-catalytic system, one of the factors affecting the degradation effect is the performance of the photocatalyst, which is usually restricted by the rapid recombination of electrons and holes as well as narrow light absorption range. In this research, a photocatalyst g-C3N4/TiO2 was prepared and coupled with gas-liquid discharge (GLD) to degrade tetracycline (TC). The performance was examined, and the degradation pathways and mechanisms were studied. Results show that a 90% degradation rate is achieved in the GLD with g-C3N4/TiO2 over a 10 min treatment. Increasing the pulse voltage is conducive to increasing the degradation rate, whereas the addition of excessive g-C3N4/TiO2 tends to precipitate agglomerates, resulting in a poor degradation efficiency. The redox properties of the g-C3N4/TiO2 surface promote the generation of oxidizing active species (H2O2, O3) in solution. Radical quenching experiments showed that ·OH, hole (h+), play important roles in the TC degradation by the discharge with g-C3N4/TiO2. Two potential degradation pathways were proposed based on the intermediates. The toxicity of tetracycline was reduced by treatment in the system. Furthermore, the g-C3N4/TiO2 composites exhibited excellent recoverability and stability.Keywords: Gas-liquid discharge; Plasma-catalysis; g-C3N4/TiO2; TC degradation

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Section: Experimental Setup Of Plasma Source and Tetracycline Degrada...mentioning

confidence: 99%

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

WANG 王,

ZHOU 周,

WANG 王

et al. 2024

Plasma Sci. Technol.

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“…The effects of the operating parameters such as applied voltage, pulse frequency and gas flow rate on the generation of ˙OH radicals both in gas and liquid phase were also investigated [10]. The repetitive pulsed gasliquid discharge in different working gases demonstrated that the Ar tip spark discharge could increase the plasma-liquid interaction efficiency and H 2 O 2 production was dominated by ˙OH radicals [11]. Wang and Bruggeman [12] investigated ˙OH flux and loss probability on quartz surface by microscopic LIF, boasting a spatial resolution of 10 µm to accurately resolve the near surface gradient of ˙OH radicals.…”

Section: Introductionmentioning

confidence: 99%

Quantitative estimation of ^·OH-radical density from fluorescence decay behavior near the plasma-liquid interface by incident microscopic LIF spectroscopy

Yang,

Qiao,

Sun

et al. 2024

J. Phys. D: Appl. Phys.

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The formation and transportation of short-lived species on/within the plasma-liquid interfacial layer plays a crucial role in various applications because of their high chemical reactivity. However, the experimental detection and quantification of these short-lived species, such as OH radicals, at the gas-liquid interface still pose formidable challenges. This study confronts this challenge by employing incident microscopic laser-induced fluorescence (mLIF) method to capture the OH-LIF signals on the interfacial layer at different time moments of the post-discharge phase under high spatial resolution. The temporal evolution of OH density is subsequently quantified by fitting the OH-LIF decay behavior to a reaction-dissolution model. Results reveal that increasing the pulse width serves better to enhance OH generation on liquid surface, reaching a density of 1.25x1016 cm-3. Furthermore, the cathode-solution interface demonstrates significantly enhanced OH production compared to the anode-solution interface. These results underscore the efficacy of incident mLIF in quantitatively probing short-lived OH-radical production at the interfacial layer in pulsed-driven plasma-solution interactions, with potential applicability to other reactive species.

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“…Plasma technology, known for its versatile discharge types, offers multiple pathways for CO 2 conversion, including corona discharge, dielectric barrier discharge (DBD), microwave plasma and gliding arc discharge [12,13]. Recently, gas-liquid discharge plasma stands out for its unique advantages, primarily its ability to generate plasma in direct contact with a liquid phase, thereby enhancing gas-liquid mass transfer and chemical reaction kinetics [14][15][16][17]. This interaction between plasma-generated species and the liquid phase facilitates the efficient production of valuable products like CO and H 2 under ambient conditions, highlighting the potential of gas-liquid discharge plasma in energy conversion endeavors.…”

Section: Introductionmentioning

confidence: 99%

Efficient synthesis of CO and H₂O₂ via nanosecond pulsed CO₂ bubble discharge

Gao,

Zhou,

Hong

et al. 2024

J. Phys. D: Appl. Phys.

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In the context of escalating global efforts to mitigate carbon emissions and explore sustainable energy resources, the transformation of CO2 into valuable chemicals and fuels via plasma technology has garnered significant attention. This study demonstrated a new pathway of CO2 conversion into CO and H2O2 via the bubble-enabled gas-liquid discharge driven by a nanosecond pulse. Results showed that the increased discharge frequency and larger pulse widths could enhance CO2 conversion rates and H2O2 yields, albeit potentially at the cost of reduced energy efficiency. Conversely, the rising time of pulse showed negligible impact on the process, whereas varying gas flow rates significantly altered CO and H2O2 yields, underscoring the nuanced influence of these parameters on the efficiency and selectivity of conversion processes. Through illuminating the dynamics of bubble discharge-assisted CO2 transformation, this study contributes to the broader understanding of gas-liquid discharge driven by nanosecond pulse, underlining its potential for addressing environmental and energy challenges.energy challenges.

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Repetitive pulsed gas–liquid discharge in different atmospheres: from discharge characteristics to plasma–liquid interactions

Abstract: Intense Ar spark discharge leads to the most efficient plasma–liquid interactions, energetic He particles give rise to multiple synthesis pathways for H2O2, and OH plays different roles in aqueous physicochemical reactions in different atmospheres.

Cited by 3 publications

References 48 publications

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

Quantitative estimation of ^·OH-radical density from fluorescence decay behavior near the plasma-liquid interface by incident microscopic LIF spectroscopy

Efficient synthesis of CO and H₂O₂ via nanosecond pulsed CO₂ bubble discharge

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Repetitive pulsed gas–liquid discharge in different atmospheres: from discharge characteristics to plasma–liquid interactions

Abstract: Intense Ar spark discharge leads to the most efficient plasma–liquid interactions, energetic He particles give rise to multiple synthesis pathways for H2O2, and OH plays different roles in aqueous physicochemical reactions in different atmospheres.

Cited by 3 publications

References 48 publications

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C3N4/TiO2

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C3N4/TiO2

Quantitative estimation of ·OH-radical density from fluorescence decay behavior near the plasma-liquid interface by incident microscopic LIF spectroscopy

Efficient synthesis of CO and H2O2 via nanosecond pulsed CO2 bubble discharge

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Product

Resources

About

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

Quantitative estimation of ^·OH-radical density from fluorescence decay behavior near the plasma-liquid interface by incident microscopic LIF spectroscopy

Efficient synthesis of CO and H₂O₂ via nanosecond pulsed CO₂ bubble discharge