Analysis of Electrical Discharge Plasma in a Gas‐Liquid Flow Reactor Using Optical Emission Spectroscopy and the Formation of Hydrogen Peroxide

Hsieh, Kevin; Wang, Huihui; Locke, Bruce R.

doi:10.1002/ppap.201500204

Cited by 34 publications

(31 citation statements)

References 46 publications

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“…This window contains the (0,0) band of the N 2 (C 3 Π u → B 3 Π g ) transition. The rotational temperature obtained from this band is believed to reliably reflect the translational temperature of gas [19,29,30,31].…”

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 98%

State-by-state emission spectra fitting for non-equilibrium plasmas: OH spectra of surface barrier discharge at argon/water interface

Voráč¹,

Synek²,

Procházka³

et al. 2017

J. Phys. D: Appl. Phys.

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Abstract. Optical emission spectroscopy applied to non-equilibrium plasmas in molecular gases can give important information on basic plasma parameters, including the rotational, vibrational temperatures and densities of the investigated radiative states. In order to precisely understand the non-equilibrium of rotational-vibrational state distribution from investigated spectra without limiting presumptions, a state-bystate temperature-independent fitting procedure is the ideal approach. In this paper we present a novel software tool developed for this purpose, freely available for scientific community. The introduced tool offers a convenient way to construct Boltzmann plots even from partially overlapping spectra, in user-friendly environment.We apply the novel software to the challenging case of OH spectra in surface streamer discharges generated from the triple-line of argon/water/dielectrics interface. After the barrier discharge is characterised by ICCD and electrical measurements, the spatially and phase resolved rotational temperatures from N 2 (C-B) and OH(A-X) spectra are measured, analysed and compared. The precise analysis shows that OH(A) states with quantum numbers (v = 0, 9 ≤ N ≤ 13) are overpopulated with respect to the found two-Boltzmann distribution. We hypothesise that fast vibrational-energy transfer is responsible for this phenomenon observed here for the first time. Finally, the vibrational temperature of the plasma and the relative populations of hot and cold OH(A) states are quantified spatially and phase resolved.PACS numbers: 52.30.-q, 52.50. Dg,

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Section: Experimental Setup and Data Acquisitionmentioning

confidence: 98%

State-by-state emission spectra fitting for non-equilibrium plasmas: OH spectra of surface barrier discharge at argon/water interface

Voráč¹,

Synek²,

Procházka³

et al. 2017

J. Phys. D: Appl. Phys.

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“…Temperature measurements carried out by Hsieh et al indicated the significant effect of O 2 in the mixture, which increased the plasma temperature. The authors also pointed out that higher power can be related to the change in UV radiation and affecting H 2 O 2 production [32]. Results obtained by Wang et al [33] indicate that NO x production depends mainly on vibrational excitation of N 2 and to a lesser extent on the thermal process.…”

Section: Introductionmentioning

confidence: 94%

Evaluation of Oxidative Species in Gaseous and Liquid Phase Generated by Mini-Gliding Arc Discharge

Pawłat

Terebun

Kwiatkowski

et al. 2019

Plasma Chem Plasma Process

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The gliding arc discharge plasma reactors are known as a source of non-equilibrium plasma at atmospheric pressure. In the present study, generation of dominant reactive oxygen and nitrogen species in gaseous and liquid phase in water by the compact gliding arc device (mini-GAD) and corresponding bactericidal effects were investigated. Water and phosphate buffer solutions were used as model liquids. Mini-GAD is a strong source of nitrogen oxides (up to 800 ppm NO and 200 ppm NO 2) that result in high concentrations of nitrites and nitrates in water solutions. The highest bactericidal efficacy towards Escherichia coli was achieved for non-buffered water solution.

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“…In addition, other less probable pathways such as OH + H 2 O * → H 2 O 2 + H2728 are also possible. In fact, there exist many reports on the H 2 O 2 formation by discharge plasma operated over and inside aqueous solutions272829303132333435. However, the determining factors which influence the H 2 O 2 production from the plasma-water interactions remain unclear.…”

mentioning

confidence: 99%

Direct synthesis of hydrogen peroxide from plasma-water interactions

Liu

Chen

et al. 2016

Sci Rep

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Hydrogen peroxide (H2O2) is usually considered to be an important reagent in green chemistry since water is the only by-product in H2O2 involved oxidation reactions. Early studies show that direct synthesis of H2O2 by plasma-water interactions is possible, while the factors affecting the H2O2 production in this method remain unclear. Herein, we present a study on the H2O2 synthesis by atmospheric pressure plasma-water interactions. The results indicate that the most important factors for the H2O2 production are the processes taking place at the plasma-water interface, including sputtering, electric field induced hydrated ion emission, and evaporation. The H2O2 production rate reaches ~1200 μmol/h when the liquid cathode is purified water or an aqueous solution of NaCl with an initial conductivity of 10500 μS cm−1.

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Analysis of Electrical Discharge Plasma in a Gas‐Liquid Flow Reactor Using Optical Emission Spectroscopy and the Formation of Hydrogen Peroxide

Cited by 34 publications

References 46 publications

State-by-state emission spectra fitting for non-equilibrium plasmas: OH spectra of surface barrier discharge at argon/water interface

State-by-state emission spectra fitting for non-equilibrium plasmas: OH spectra of surface barrier discharge at argon/water interface

Evaluation of Oxidative Species in Gaseous and Liquid Phase Generated by Mini-Gliding Arc Discharge

Direct synthesis of hydrogen peroxide from plasma-water interactions

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