Characterization of a microwave plasma jet (TIAGO) in‐contact with water: Application in degradation of methylene blue dye

Hamdan, Ahmad; Gagnon, Clara; Aykul, Melisa; Profili, Jacopo

doi:10.1002/ppap.201900157

Cited by 11 publications

(8 citation statements)

References 42 publications

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“…Non-thermal atmospheric pressure plasmas, such as plasma jets [1][2][3][4] and dielectric barrier discharges [5,6], have been extensively studied during the past century. In principle, such plasmas can be sustained in various regimes, such as streamers [7], spark [8], corona [9], and glow [10], among others [11], and they are used in numerous applications, including surface processing, thin film deposition, and biomedicine [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…In the latter case, the plasma and the liquid can be coupled directly or indirectly. Indirectly coupled plasmas such as plasma jets in contact with liquid are independent of the liquid medium [2,17,18]; however, their dynamics and properties are strongly influenced by the liquid [19]. Meanwhile, directly coupled plasmas are electrically connected to the liquid, which is considered as an electrode in the system [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Time and space-resolved imaging of an AC air discharge in contact with water

Diamond

Hamdan

Profili

et al. 2020

J. Phys. D: Appl. Phys.

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Numerous physical and chemical phenomena are involved in liquid plasmas. These phenomena are highly sensitive to the plasma source and to experimental conditions. In this study, we investigate the temporal dynamics of an AC-sustained plasma produced in air by a discharge between a pin electrode and water. Depending on the gap distance (d), a discharge transition is observed at d = 4.5 mm. At d < 4.5 mm, voltage drop is observed during both positive and negative half-periods (i.e. when water is cathode and anode, respectively). Meanwhile, at d > 4.5 mm, voltage drop is observed only during the negative half-period (i.e. when water is anode). Before transition and when water is cathode, the plasma emission in the gap space consists of two components: a conical-like emission at the water surface and a cylindrical-like emission in the gap. When water is anode, strong emission is observed at the electrode pin, along with a disc-like emission at the water surface. Increasing d beyond 4.5 mm (i.e. after transition) modifies the emission structure at the water surface, forming an inner homogeneous spot at the center of an outer ring. The temporal evolution of the emission in the gap and at the water surface is also discussed, and its relationship with the injected power is assessed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time and space-resolved imaging of an AC air discharge in contact with water

Diamond

Hamdan

Profili

et al. 2020

J. Phys. D: Appl. Phys.

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“…In this regard, to maintain a generation of a plasma in a conductive media, advanced technology is usually needed, e.g., high-voltage source with very fast rising time [14], although electrode erosion is always manifesting once it is in contact with plasma. Very recently, a MWPJ in TIAGO (Torche à Injection Axiale sur Guide d'Onde, in French) configuration has been studied and it shows very high potential to remove organic pollutants from water at high conductivity [30].…”

Section: Methylene Blue Degradation As a Function Of σWmentioning

confidence: 99%

Microwave Plasma Jet in Water: Effect of Water Electrical Conductivity on Plasma Characteristics

Hamdan

Profili

Suk

2019

Plasma Chem Plasma Process

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Plasma-induced water treatment is a novel water treatment technique that has shown high efficiency and flexibility. Although the electrical conductivity of impure water varies depending on the degree of pollution, its influence on plasma treatment efficiency is not well understood. In this study, we investigate the fundamentals of a microwave plasma jet submerged in water with electrical conductivities (σw) ranging from 10 to 10000 µS/cm. The plasma characteristics, namely composition, electron density, and temperature, and their variations as a function of σw, are derived using optical emission spectroscopy. The plasmabubble dynamics is investigated using space-and time-resolved high-speed imaging. The results show that the plasma fills the bubble volume at relatively low flow rate (typically, < 2 L/min) and high σw (typically, > 1000 µS/cm). The influence of σw on the degradation of methylene blue, a standard water pollutant, is also assessed, and the obtained results indicate that the plasma becomes extremely inefficient at high σw. These findings are of great importance for the community of plasma-induced liquid processing, particularly wastewater treatment.

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“…As a result, eliminating water and air pollution has been a rising scientific issue in recent decades. Different techniques have been introduced for air and water pollutants' treatment, including plasma-based techniques [3][4][5]. When dealing with air pollution, it is important to first identify harmful gases.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

et al. 2021

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Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as CO2 gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical analyses for all the prepared nanomaterials were performed using X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), and UV/Vis spectrophotometer devices, respectively. According to the XRD analysis, the crystal sizes of ZnO and ZnO/CNTs were approximately 50.4 and 65.2 nm, respectively. CNTs have average inner and outer diameters of about 3 and 13 nm respectively, according to the transmitted electron microscope (TEM), and a wall thickness of about 5 nm. The detection of CO2 is accomplished by passing varying rates of the gas from 30 to 150 sccm over the prepared thin-film electrodes. At 150 sccm, the sensitivities of ZnO and ZnO/CNTs sensors are 6.8% and 22.4%, respectively. The ZnO/CNTs sensor has a very stable sensitivity to CO2 gas for 21 days. Moreover, this sensor has a high selectivity to CO2 in comparison with other gases, in which the ZnO/CNTs sensor has a higher sensitivity to CO2 compared to H2 and C2H2.

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Characterization of a microwave plasma jet (TIAGO) in‐contact with water: Application in degradation of methylene blue dye

Cited by 11 publications

References 42 publications

Time and space-resolved imaging of an AC air discharge in contact with water

Time and space-resolved imaging of an AC air discharge in contact with water

Microwave Plasma Jet in Water: Effect of Water Electrical Conductivity on Plasma Characteristics

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

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