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Corona Electric Discharge as a Source of Chemically Active Species
Plasma Chemistry and Plasma Processing ( IF 3.6 ) Pub Date : 2021-05-26 , DOI: 10.1007/s11090-021-10180-9
Igor M. Piskarev

The yields of oxidation of substances in aqueous solutions under the action of a corona electric discharge were studied. The possibilities of reducing the energy consumption for the oxidation of organic compounds by hydroxyl radicals by initiating and maintaining chain reactions are considered. Hydroxyl radicals were generated in a corona electric discharge on a point solid electrode located above the surface of an aqueous solution. Under the experimental conditions, an ozone-hydroxyl mixture is formed, in which the lifetime of hydroxyl radicals increases to 0.2 s. The conditions for the development of a chain reaction were analysed. Experiments were carried out for aqueous solutions of phenol with COD values from 710 to 2900 mg O/L, oxalic acid with a COD of 2000 mg O/L and 0.1 M solution KI for treated liquid volumes from 2.5 to 35 L. Oxalic acid was used as a detector of hydroxyl radicals, KI solution – detector OH + O3. At a low concentration of dissolved organic substances (COD ~ 700 mgO/L), initiation of a chain reaction is impossible. It is shown that there are conditions, when take place the inhibition of chain oxidative reactions of phenol. The reasons for inhibition are a decrease in the pH of the medium, the transformation of primary radicals into inactive secondary ones, and the occurrence of reverse reactions. The yield of hydroxyl radicals is ~ 0.2 (100 eV)−1, while the oxidation yield reaches ~ 7.5 (100 eV)−1 and increases with an increase in the volume of the treated liquid.



中文翻译:

电晕放电作为化学活性物质的来源

研究了在电晕放电作用下水溶液中物质的氧化产率。考虑了通过引发和维持链反应来减少通过羟基自由基氧化有机化合物的能量消耗的可能性。在位于水溶液表面上方的点状固体电极上,在电晕放电中会产生羟基自由基。在实验条件下,形成臭氧-羟基混合物,其中羟基自由基的寿命增加至0.2 s。分析了发生链反应的条件。针对COD值为710至2900 mg O / L的苯酚水溶液,COD为2000 mg O / L的草酸和0.1 M KI溶液进行了实验,处理液体积为2.5至35 L.  + O 3。在低浓度的溶解有机物(COD〜700 mgO / L)下,不可能引发链式反应。结果表明,在一定条件下,发生苯酚链氧化反应的抑制作用。抑制的原因是培养基的pH降低,伯自由基转变为无活性的仲自由基以及发生逆反应。羟基自由基的产率为〜0.2(100 eV)-1,而氧化产率达到〜7.5(100 eV)-1,并随着处理液体积的增加而增加。

更新日期:2021-05-26
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