The Role of Pulse Voltage Amplitude on Chemical Processes Induced by Streamer Discharge at Water Surface

Ruma,; Hosano, Hamid; Sakugawa, Takashi; Akiyama, H.

doi:10.3390/catal8050213

Cited by 20 publications

(9 citation statements)

References 34 publications

(41 reference statements)

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“…This colour change can be quantified by the change in absorption at 605 nm (Bader and Hoigné 1981). This indigo reaction has been widely used to characterise other plasma-liquid systems (Gao et al 2013;Wright et al 2018b;Ruma et al 2018). Firstly, a calibration curve was obtained by measuring the transmitted light intensity for known dilutions of the initial indigo dye solution.…”

Section: Mass Transfer Experimentsmentioning

confidence: 99%

An integrated microfluidic chip for generation and transfer of reactive species using gas plasma

Ogunyinka

Wright

Bolognesi

et al. 2020

Microfluid Nanofluid

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Reactive species produced by atmospheric-pressure plasma (APP) are useful in many applications including disinfection, pretreatment, catalysis, detection and chemical synthesis. Most highly reactive species produced by plasma, such as ·OH, 1O2 and $$ {\text{O}}_{2}^{ \cdot - } $$O2·-, are short-lived; therefore, in situ generation is essential to transfer plasma products to the liquid phase efficiently. A novel microfluidic device that generates a dielectric barrier discharge (DBD) plasma at the gas–liquid interface and disperses the reactive species generated using microbubbles of ca. 200 µm in diameter has been developed and tested. As the bubble size affects the mass transfer performance of the device, the effect of operating parameters and plasma discharge on generated bubbles size has been studied. The mass transfer performance of the device was evaluated by transferring the reactive species generated to an aqueous solution containing dye and measuring percentage degradation of the dye. Monodisperse microbubbles (polydispersity index between 2 and 7%) were generated under all examined conditions, but for gas flow rate exceeding a critical value, a secondary break-up event occurred after bubble formation leading to multiple monodisperse bubble populations. The generated microbubble size increased by up to ~ 8% when the device was operated with the gas plasma in the dispersed phase compared to the case without the plasma due to thermal expansion of the feed gas. At the optimal operating conditions, initial dye concentration was reduced by ~ 60% in a single pass with a residence time of 5–10 s. This microfluidic chip has the potential to play a significant role in lab-on-a-chip devices where highly reactive species are essential for the process.

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Section: Mass Transfer Experimentsmentioning

confidence: 99%

An integrated microfluidic chip for generation and transfer of reactive species using gas plasma

Ogunyinka

Wright

Bolognesi

et al. 2020

Microfluid Nanofluid

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“…It also depends on the characteristics of the dielectric layer. On the other hand, under various electric discharge conditions will lead to the generation of OH•, O•, H• free radicals as well as O, H, O3, H2O2 active species were different (Sengupta et al 1994;Sengupta et al 1998;Burlicaa et al 2004;Kogelschatz et al 2002;Joshi et al 1995;Nishioka et al 2009;Ruma et al 2018;Barni et al 2019). These are agents that has high redox properties (Kanazawa et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Application of electrochemical plasma on iron electrodes for treating 2,4-Dichlorophenoxyacetic acid (2,4-D) and 2,4,5-Trichlorophenoxyacetic acid (2,4,5-T) in water environment

Tran

Nguyen²,

Tran³

et al. 2021

Preprint

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The herbicide compounds contain aromatic ring and chlorine atom such as 2,4-dichlorophenoxylacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic (2,4,5-T) cause serious environmental pollution. However, it is very difficult to decompose by chemical, physical and biological methods. The high voltage direct current electrochemical method can be control to form plasma on metallic electrodes. Thus, it creates active species like as H 2 , O 2 , H 2 O 2 and free radicals such as: H•, O•, OH•. Especially, OH• free radicals that has a high oxidation potential, so it is possible to oxidize benzene oring compounds more effective. The iron electrode is used in the studing to combine the dissolve process of the iron anode electrode with aims is to create Fe 2+ ions and electrochemical fenton reaction. Besides, the flocculation process by Fe(OH) 2 also happen. The plasma will appear with a voltage of 5 kV on the iron electrode in a solution of 30 mg/L 2,4-D or 2,4,5 T. After a period time of the reaction, the aromatic oring compounds contaning the chlorine was treated, the electric conductivity of the solution increases due to the amount of Cl - ions releasing in the solution. The degradable products of the 2,4-D and 2,4,5-T were analyzed qualitatively by the gas chromatograph mass spectrometer GC-MS 6890-5975 Agilent system. The results described that the straight chain carboxylic acids were formed in the solution. These compounds are easy to oxidize thoroughly under appropriate conditions in solution by OH• free radicals . Moreover, the 2,4-D and 2,4,5-T were also analyzed quantitatively by a calibration curve from GC-MS 6890-5975 Agilent system or high performance liquid chromatograph HPLC 1100 Agilent system. The treatmental process can be controlled to achieve optimum performance by technological factors such as input voltage, distance between anode and cathode electrodes, initial concentration of 2,4-D and 2,4,5-T as well as flowing air through solution. The analysis results showed that the degradation efficiency of 2.4-D and 2,4,5-T reached at 99.98%; 99.83%, respectively.

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“…The advantage of this method is a simultaneous contact of the discharge plasma with gas and liquid molecules. Atmospheric WSD combines the gas phase discharge formed on the water surface with the liquid discharge, without requiring any additional supplementary gas [36]. WSD initiates several physical and chemical processes, resulting in intense EFs, UV emission, shock waves, and reactive radicals, ions, and molecular species in the air at the surface and in the water.…”

Section: Introductionmentioning

confidence: 99%

“…Primary radicals or ions generated in the gas-liquid interface are injected into the water to react and form secondary molecular species, e.g., OH radicals, H 2 O 2 , and ozone, which are very efficient to degrade organic pollutants in water [36]- [39].…”

Section: Introductionmentioning

confidence: 99%

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

2019

Self Cite

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Water quality improvement and collecting safe water are two of the paramount concerns in today's world. Numerous water treatment and pollutant removal processes are introduced that vary with the type of pollutants. Among the proposed pollutant degradation methods, pulsed power is one of the effective methods that can be applied not only to degrade a wide range of contaminants but also to address the environmental issues associated with water treatment chemicals. The effectiveness of the pulsed power technology in water treatment was studied for a wide range of pollutants including microorganisms, nutrient pollution, emerging pollutants, and organic pollutants. This paper presents a review of pulsed power systems developed for organic and inorganic pollutants degradation in different water treatment applications. Also, it presents the effectiveness of several factors like the electrical characteristics of the pulse voltages and treatment time on degradation rates of different pollutants.

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The Role of Pulse Voltage Amplitude on Chemical Processes Induced by Streamer Discharge at Water Surface

Cited by 20 publications

References 34 publications

An integrated microfluidic chip for generation and transfer of reactive species using gas plasma

An integrated microfluidic chip for generation and transfer of reactive species using gas plasma

Application of electrochemical plasma on iron electrodes for treating 2,4-Dichlorophenoxyacetic acid (2,4-D) and 2,4,5-Trichlorophenoxyacetic acid (2,4,5-T) in water environment

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

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