The study of H2O2 generation by DC diaphragm discharge in liquids

Stará, Zdeňka; Krčma, František

doi:10.1007/bf03166529

Cited by 43 publications

(26 citation statements)

References 2 publications

(5 reference statements)

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“…The possibility of an excitation source for determination of metallic atoms in the solution has been already mentioned above [14]. Next useful process studied by our works is production of hydrogen peroxide [15]. Fig.…”

Section: Examples Of Diaphragm Discharge Applicationsmentioning

confidence: 72%

Diaphragm discharge in liquids: Fundamentals and applications

Krčma

Stará

Procházková

2010

J. Phys.: Conf. Ser.

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Paper describes results of our research on DC diaphragm discharge creation in water solutions of electrolytes from the viewpoint of its principles, properties and applications. The thermal theory of discharge ignition in bubbles of evaporated solution has been confirmed by both high speed camera and sound records. Static current-voltage characteristics revealed a significant dependence of discharge breakdown on the solution conductivity. Determined breakdown parameters lay in the range of 900-1300 V and 40-100 mA, respectively, for NaCl solution conductivity varying from 150 to 1300 µS•cm-1. Time resolved electrical characteristics showed a simultaneous appearance of current, voltage and sound oscillations as well as a light emission. Plasma diagnostics by optical emission spectroscopy confirmed formation of reactive species (hydroxyl, hydrogen and oxygen radicals) and excitation of metallic atoms presented in the solution. Moreover, rotational temperature was calculated from the obtained OH spectrum. Experiments focused on the diaphragm discharge applications are outlined in the paper. Results of hydrogen peroxide production, organic dye decomposition and treatment of humic acid solutions are compared from the viewpoint of experimental conditions.

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Section: Examples Of Diaphragm Discharge Applicationsmentioning

confidence: 72%

Diaphragm discharge in liquids: Fundamentals and applications

Krčma

Stará

Procházková

2010

J. Phys.: Conf. Ser.

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“…With an increase of ∼ 8 • C in temperature, ∼ 14 % higher initial rate is found. 16 At fixed applied power, the initial solution conductivity in the range of 100 ÷ 500 µS cm −1 appears to have only negligible effect on k H 2 O 2 [ Fig. 6].…”

Section: Resultsmentioning

confidence: 99%

“…For the other measurements the same relative error was assumed. [17]); the applied power was however not specified [16]. A correlation between the temperature of aqueous solution T heated by the discharge and k H 2 O 2 is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen peroxide production in capillary underwater discharges

et al. 2006

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Hydrogen peroxide production by an AC driven capillary underwater discharge was investigated quantitatively. Concentration of formed hydrogen peroxide was measured by a colorimetric method using a specific reaction between H2O2 and a titanium reagent. It comes out that the amount of H 2 O 2 increases linearly during the first hour of the discharge duration and is slightly higher at the high voltage side of the capillary. The initial rate of H2O2 formation by the capillary discharge was therefore determined for initial electrical conductivity of aqueous solution in the range of 100 ÷ 500 µS cm −1 . The initial rate of H2O2 formation increases with applied power at fixed initial conductivity of aqueous solution. Experiments performed at fixed applied power indicate that the initial conductivity appears to have only negligible effect on the initial rate of H2O2 formation.

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“…This difference in H 2 O 2 formation in opposite polarities of the DC regime is caused by different energy dissipation around the pinhole in the dielectric barrier. More details about hydrogen peroxide formation initiated by the DC non-pulsing discharge at various conditions were published in our several papers [10,22,23]. In case of the high frequency discharge, production rates of hydrogen peroxide are almost the same at lower conductivities up to 500 µS cm −1 as in the cathode part of the DC discharge, but they reached lower values when higher conductivities are used.…”

Section: Resultsmentioning

confidence: 99%

Generation of High Frequency Pin-hole Discharge in Water Solutions

2014

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This paper presents results on electric discharge generation by high frequency high voltage (15-100 kHz) in NaCl solutions with different initial conductivity (100-1300 mS cm -1 ), and compares them with DC discharge in the same electrode configuration. A batch plasma reactor in the pin-hole configuration contained a ceramic dielectric barrier separating two planar stainless steel electrodes; barrier thickness of 0.6 mm and pin-hole diameter of 0.6 mm was used. Lissajous charts were evaluated from electric measurements for different discharge phases (electrolysis, bubble formation and discharge regular operation). Breakdown moments for different solution conductivities were determined from discharge power evaluation as a function of applied frequency. Breakdown voltage amplitude was decreased by the increasing conductivity in both regimes while frequency and current decreased. Changes of physical parameters (temperature, solution conductivity and pH) as well as production of hydrogen peroxide at different solution conductivities were compared. Solution conductivity was increased in both discharge regimes and with the initial conductivity value. Solution temperature was increased by the discharge in both regimes and with the increasing initial conductivity, too. Solution pH dropped to acidic conditions when HF or DC positive regime was applied while it was enhanced by DC negative regime.

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The study of H2O2 generation by DC diaphragm discharge in liquids

Cited by 43 publications

References 2 publications

Diaphragm discharge in liquids: Fundamentals and applications

Diaphragm discharge in liquids: Fundamentals and applications

Hydrogen peroxide production in capillary underwater discharges

Generation of High Frequency Pin-hole Discharge in Water Solutions

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