Generation of ozone by pulsed corona discharge over water surface in hybrid gas–liquid electrical discharge reactor

Lukeš, Petr; Člupek, M.; Babický, V.; Janda, V.; Šunka, P.

doi:10.1088/0022-3727/38/3/010

Cited by 196 publications

(118 citation statements)

References 53 publications

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“…5 However, the rate and efficiency of H 2 O 2 formation is not necessarily dependent on the electrode material. 6 Another efficient strategy which can be applied to enhance the generation of active species and the consequent pollutant degradation is the combination of non-thermal plasma reactors with different advanced oxidation processes, such as ozonation, 7 TiO 2 photo-catalysis, [8][9][10] alumina and silica gel (resulting in adsorption) 11 and homogeneous (e.g., Fe…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on methylene blue decolorization in aqueous medium in electrical discharge plasma reactor

Benetoli¹,

Cadorin²,

Postiglione³

et al. 2011

J. Braz. Chem. Soc.

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Este estudo investigou o efeito da temperatura da solução sobre a descoloração do azul de metileno em um reator de plasma de descarga elétrica do tipo ponta-plano. Os resultados mostraram um aumento da porcentagem inicial de descoloração do corante com o aumento da temperatura da solução de 4 para 28 o C, mas de 28 para 37 o C não houve alteração. Entretanto, quando a temperatura foi elevada para 47 o C a porcentagem de descoloração inicial do corante diminuiu. A formação de peróxido de hidrogênio em água durante o tratamento por plasma diminuiu com o aumento da temperatura de 4 para 47 o C. A reação de descoloração ocorreu por um complexo mecanismo onde processos de zero e primeira ordem ocorreram numa mesma temperatura, seguindo ordem zero no início do processo e primeira ordem com o progresso da reação. A energia de ativação envolvida no processo de primeira ordem foi de 13,09 kJ mol o C. The dye decolorization reaction occurred via a complex mechanism where zero-and first-order processes took place at the same temperature, following zero-order in the initial step and first-order with the progress of the reaction. The activation energy involved in the first-order process was 13.09 kJ mol -1 .

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Section: Introductionmentioning

confidence: 99%

Effect of temperature on methylene blue decolorization in aqueous medium in electrical discharge plasma reactor

Benetoli¹,

Cadorin²,

Postiglione³

et al. 2011

J. Braz. Chem. Soc.

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“…A number of studies have utilized pulsed gas phase discharges generated over a water surface to produce in the gas or at the gas-liquid interface strongly oxidative species, such as OH radicals, O atoms, ozone (O 3 ) and hydrogen peroxide (H 2 O 2 ) [16,19,24,25]. Due to the microsecond lifetime of radicals such as OH and O, only O 3 and H 2 O 2 , produced above the water surface (in the gaseous phase), can diffuse into the aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

Influence of iron ions on the phenol oxidation

2006

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An influence of iron ions presence in water contaminated with phenol on phenol degradation induced by the corona discharge in air-like gas mixture was studied. DC positive corona discharge was generated between a hollow needle, through which air with 1.5 % CO 2 flowed, and the water surface. Concentration of phenol and iron sulphate in water was 0.6 mM and 0.08 mM, respectively. It was observed that phenol degradation was not enhanced by the presence of iron ions. There was no Fenton reaction producing OH radicals, in spite of significant production of hydrogen peroxide. Instead of going into Fenton reaction with hydrogen peroxide molecules, iron ions react with ozone which is produced in gas phase and then dissolves in water.PACS : 52.80.Wq

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“…The phenol decomposition rate at 60 min is greatest (56%) in pure O 2 , it has the second highest value (42%) in pure N 2 , and lesser values (under 40%) are obtained in other N 2 -O 2 mixtures. When N 2 -O 2 is used as the background gas, the following reactions can be induced in a pulsed discharge plasma [5,[7][8][9][10]12]:…”

Section: Influence Of Charging Voltage and Number Of Needle Electrodementioning

confidence: 99%

“…Kuroki and colleages [4] generated pulsed discharge plasma above an aqueous phenol solution with air, Ar, and H 2 O 2 gas sparging and described the reactions in the plasma in the case of each sparging gas. Lukes and colleagues [5] generated pulsed discharge plasma above water in the air and reported that oxidizing agents such as OH, O 3 , O, and H 2 O 2 were produced in the plasma. Furthermore, they reported that OH radicals were also produced by the reaction between H 2 O vapor and nitrogen molecules excited in the metastable state [hereafter described as N 2 (A)].…”

Section: Introductionmentioning

confidence: 99%

Pulsed discharge purification of water containing nondegradable hazardous substances

Miyazaki

Satoh

2010

Electrical Engineering Japan

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SUMMARYWe investigate the decomposition characteristics of phenol in an aqueous solution under exposure to pulsed discharge plasma. The investigation is carried out with different electrode configurations, applied voltages, and humidity levels and compositions of the background gas. It is possible that in the case of all gases, OH radicals are responsible for the decomposition of phenol in the solution. In pure O 2 , the decomposition rate of phenol increases due to the generation of O and O 3 . In pure N 2 , OH radicals produced by N 2 , which is excited in the metastable state, contribute to phenol decomposition. In N 2 -O 2 , the decomposition rate of phenol remains low, and the NO x produced by the pulsed plasma in a N 2 -O 2 mixture destroys O 3 , and the production of the NO x inhibits O 3 production. In Ar-O 2 , the decomposition rate of phenol increases with an increase in the concentration of Ar in the mixture. It is possible that excited Ar atoms are responsible for the decomposition of phenol in the solution at higher concentrations of Ar in Ar-O 2 . Further, it is found that the decomposition rate of phenol in aqueous solution exposed to a pulsed discharge is almost the same as that of phenol in aqueous solution exposed to a DC corona discharge.

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Generation of ozone by pulsed corona discharge over water surface in hybrid gas–liquid electrical discharge reactor

Cited by 196 publications

References 53 publications

Effect of temperature on methylene blue decolorization in aqueous medium in electrical discharge plasma reactor

Effect of temperature on methylene blue decolorization in aqueous medium in electrical discharge plasma reactor

Influence of iron ions on the phenol oxidation

Pulsed discharge purification of water containing nondegradable hazardous substances

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