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首页> 外文期刊>Chemical engineering journal >Actions of nitrogen plasma in the 4-chrolophenol degradation by pulsed high-voltage discharge with bubbling gas
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Actions of nitrogen plasma in the 4-chrolophenol degradation by pulsed high-voltage discharge with bubbling gas

机译：氮气在鼓泡气体脉冲高压放电中4-氯苯酚降解中的作用

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摘要

Air is often used as bubbling gas with the purpose of improving the liquid discharge performance in some pulsed high-voltage discharge systems. Nitrogen in air could dissociate into active species that might participate in a series of liquid chemical reactions. In the discharge system with 4-chlorophenol as target contaminant, some more toxic intermediates were formed and the energy efficiency was decreased by bubbling air and nitrogen. The G_(50) (energy cost at 50% conversion) is about 0.91 g (KW h)~(-1) 0.70 g (KW h)~(-1) and 0.49 g (KW h)~(-1) respectively by bubbling oxygen, air and nitrogen. Nitro- compounds such as 4-chloro-2-nitrophenol and 4-nitrocatechol were identified, providing evidence for the formation of nitro group. Chloride ion (Cl~-) dropped in the degradation process could be activated and react with non-degradable 4-chlorophenol to form 2,6-dichlorophenol. Phenol was also identified for higher yield of reductive radicals. Comparing 4-chlorophenol degradation by bubbling air or nitrogen with that by oxygen, the degradation rates of original contaminants and intermediate products were lower under same energy input. By discharging for 60min with applied input energy density of 175 WL~(-1), almost all of aromatic substances were removed with bubbling oxygen but they still remained at about 8.83% with bubbling air and 12.79% with nitrogen/Furthermore, nitrogen in the bubbling gas was transformed into inorganic nitrogen such as NO2~- and NO3~- that increased linearly with discharge time and achieved a formation rate twice as the degradation rate of original target contaminant.
机译：为了改善某些脉冲高压放电系统中的液体放电性能，经常将空气用作鼓泡气体。空气中的氮会分解成可能参与一系列液体化学反应的活性物种。在以4-氯苯酚为目标污染物的排放系统中，形成了更多有毒的中间体，并且通过鼓入空气和氮气降低了能量效率。 G_（50）（50％转换时的能源成本）分别约为0.91 g（KW h）〜（-1）和0.70 g（KW h）〜（-1）和0.49 g（KW h）〜（-1）通过鼓泡氧气，空气和氮气。确定了硝基化合物，例如4-氯-2-硝基苯酚和4-硝基邻苯二酚，为形成硝基提供了证据。降解过程中滴落的氯离子（Cl〜-）可以被活化并与不可降解的4-氯苯酚反应生成2,6-二氯苯酚。还发现苯酚具有较高的还原自由基产率。将空气或氮气鼓泡与氧气进行4-氯苯酚降解相比，在相同的能量输入下，原始污染物和中间产物的降解率较低。通过以175 WL〜（-1）施加的输入能量密度放电60分钟，几乎所有的芳族物质都被鼓泡的氧气除去，但是在鼓泡的空气中它们仍然保持在约8.83％的水平，而在氮气下仍保持在12.79％的水平，此外，鼓泡气体被转化为无机氮，例如NO2〜-和NO3〜-随放电时间的增加而线性增加，其形成速率是原始目标污染物的降解速率的两倍。

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