Generation of Hydrogen Peroxide in Gas Bubbles Using Pulsed Plasma for Advanced Oxidation Processes

Saeki, Ryo; Yasuda, Kôichi

doi:10.1109/tps.2015.2424977

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…A pulsed gliding arc discharge with droplets achieved the highest energy efficiency [19]; however, it is difficult to maintain such a discharge stably with water at a high conductivity, as is the case with produced water. Therefore, we focused on plasma generated with a water electrode [15,[20][21][22][23][24][25][26][27][28][29][30][31][32][33], which can be generated easily regardless of the conductivity of the solution. In this study, the production mechanism of liquid-phase H 2 O 2 was investigated in the case of dc plasma generated over a water surface -because of its relatively high generation rate and efficiency, and the ease in the analyses including a numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the production mechanism of liquid-phase H 2 O 2 was investigated in the case of dc plasma generated over a water surface -because of its relatively high generation rate and efficiency, and the ease in the analyses including a numerical simulation. Although a pulsed plasma achieves a higher energy efficiency in H 2 O 2 generation than a dc plasma [33], there is basically a tradeoff between the efficiency and the generation rate. It is expected that the knowledge obtained in this study will improve the H 2 O 2 generation rate and efficiency in various types of plasma.…”

Section: Introductionmentioning

confidence: 99%

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Generation mechanism of hydrogen peroxide in dc plasma with a liquid electrode

Takeuchi

Ishibashi

2018

Plasma Sources Sci. Technol.

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The production mechanism of liquid-phase H 2 O 2 in dc driven plasma in O 2 and Ar with a water electrode was investigated. When a water anode was used, the concentration of H 2 O 2 increased linearly with the treatment time. The production rate was proportional to the discharge current, and there was no dependence on the gap distance. On the other hand, the production rate was much smaller with a water anode. We concluded that the production of gas-phase H 2 O 2 in the cathode sheath just above a water cathode and diffusion of this H 2 O 2 into the water constitute the key mechanism in the production of liquid-phase H 2 O 2 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation mechanism of hydrogen peroxide in dc plasma with a liquid electrode

Takeuchi

Ishibashi

2018

Plasma Sources Sci. Technol.

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“…33 Free radical formation in the micro/nano-bubble water system was recognized as the plasma-nano bubble technique, 17 in which gas bubbles were produced into any liquid. 34 After the electrical current is released in micro/nano water bubbles in a short time, many reactive species such as radicals, hydroxyl radicals, OH°; superoxide radical (O 2 -), H 2 O 2 , etc. are generated, 35,36 which could be rechecked by optical emission spectroscopy (OES).…”

Section: Discussionmentioning

confidence: 99%

Comparative active compounds and antioxidant activity between the sweet- and sour-type star fruit (Averrhoa carambola L.) In Vitro

Kaju¹,

Leelarungrayub²,

Natakankitkul³

et al. 2022

JAMS

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Background: Star fruit (Averrhoa carambola L.) is seasonal and originates from many Southeast Asia countries, including Thailand. Previous evidence claimed that it has various antioxidative compounds such as phenolics, saponins, flavonoid C-glycosides, tannin and L-ascorbic acid. In Thailand, the sweet-type of star fruit (SF) is cultivated and marketed more than the sour-type, but their different antioxidant and active compounds between both types have not been investigated. Objectives: This study aimed to compare the active compounds and anti-oxidant activity between sweet- and sour-type SF in vitro. Materials and methods: Active compounds such as total phenolic compound, total flavonoids and L-ascorbic acid in extracts were evaluated between sweet- and sour-type SF crude extracts by using Folin-Ciocalteau reagent, aluminum chloride colorimetric assay and high-performance liquid chromatography, respectively. Antioxidant activity on scavenging radicals such as the 2,2'-azino-bis (3-ethylbenzthiazoline-6-sulphonic acid) (ABTS•+) cation and 1,1-diphenyl-2-picrylhydrazyl (DPPH) cation and nitric oxide (NO) was analyzed. Moreover, the protective activity of glutathione (GSH) oxidation from free radicals generated by high voltage (HV)-stimulation in a mixture of plasma micro/nanobubble water; the same as that of protein oxidation in bovine serum albumin (BSA) and malondialdehyde (MDA) from 2,2’-Azobic (2-amidinopropane) dihydrochloride (AAPH), was evaluated in vitro. Results: Sour-type SF extract at 1 gm showed higher total phenolics (1,625±2.3 µg equivalent gallic acid [GAE]), total flavonoid (245±3.6 µg equivalent quercetin), and ascorbic acid (Vit C) (565±4.5 µg) than sweet-type (520±3.5 µg GAE, 187±2.5 µg, and 513±2.6 µg). In addition, sour-type SF showed a lower dose of inhibitory concentration of 50% (IC50) than sweet-type on scavenging DPPH (32.32±2.3 & 58.9±2.4 mg) and NO (23.1 ± 1.1 mg & undetected). However, IC50 on ABTS•+ scavenging of sweet-type was lower than that of sour-type (348.8±2.5 & 511.9±2.6 mg). Sweet-type showed protective effects with a dose response at 0.25-1.0 mg of extract, 125-500 µg of protein carbonyl and 62.5-500 µg of lipid peroxidation. However, sour-type at high doses showed pro-oxidant activity on increased GSH oxidation, protein carbonyl and MDA formation. Conclusion: Sour-type SF showed higher active antioxidants, such as total phenolics, total flavonoids and Vit C as well as radical scavenging of DPPH and NO, than sweet-type SF. However, high concentrations aggravated GSH, protein and lipid oxidation. Whereas, sweet-type SF showed beneficial protective effects.

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“…It is known that the production energy efficiency of H 2 O 2 using plasma heavily depends on the electrode configuration, gas composition, and discharge parameters. [65][66][67] If the supply ratio of O 3 to H 2 O 2 is maintained at a suitable value, 51) then the improvement of H 2 O 2 production efficiency directly leads to the improvement of TOC decomposition efficiency. Therefore, a diaphragm discharge plasma, which can achieve a higher production rate of H 2 O 2 at a higher energy efficiency compared to the plasma generated within gas bubbles, was combined with an ozonizer.…”

Section: Characteristics Of Acetic Acidmentioning

confidence: 99%

Review of plasma-based water treatment technologies for the decomposition of persistent organic compounds

Takeuchi

Yasuda

2020

Jpn. J. Appl. Phys.

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The establishment of economical and eco-friendly technologies for water treatment is a crucial issue for the realization of a sustainable society. Plasma-based treatments are promising methods for the decomposition of persistent organic compounds. This progress report summarizes recent improvements to plasma-based water treatment technologies by focusing on two types of contaminated solutions: solutions containing high concentrations of acetic acid and solutions containing surfactants, such as perfluorooctane sulfonic acid. Decomposition processes were analyzed based on chemical and physical characteristics, such as chemical reactions, the transportation of reactive species, and characteristics of target compounds. When treating solutions containing acetic acid, the optimization of bulk reactions involving ozone, which regenerates OH radicals from hydrogen peroxide, is a key factor for achieving high decomposition rates and energy efficiency. In contrast, the treatment of surfactants involves interfacial reactions at the plasma–liquid interface, where the accumulation of surfactants is a major concern.

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Generation of Hydrogen Peroxide in Gas Bubbles Using Pulsed Plasma for Advanced Oxidation Processes

Cited by 7 publications

References 13 publications

Generation mechanism of hydrogen peroxide in dc plasma with a liquid electrode

Generation mechanism of hydrogen peroxide in dc plasma with a liquid electrode

Comparative active compounds and antioxidant activity between the sweet- and sour-type star fruit (Averrhoa carambola L.) In Vitro

Review of plasma-based water treatment technologies for the decomposition of persistent organic compounds

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