Investigation of the loss mechanisms of hydroxyl radicals in the decomposition of organic compounds using plasma generated over water
Investigation of the loss mechanisms of hydroxyl radicals in the decomposition of organic compounds using plasma generated over water
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DOI：
10.7567/jjap.54.116201
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发表时间：
2015-10
影响因子：
1.5
通讯作者：
N. Takeuchi;Mizuki Ando;K. Yasuoka
中科院分区：
文献类型：
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作者：
N. Takeuchi;Mizuki Ando;K. Yasuoka
许多类型的等离子体工艺已被研究作为使用羟基自由基（OH）分解水中持久性有机化合物的潜在试剂，并且已经观察到在减少总有机碳（TOC）方面的广泛的能量效率。在这项研究中，使用在乙酸溶液中产生的等离子体研究了限制能量效率的乙醇的损失机制。各种实验，包括分解过程的分析，参数研究和数值模拟，揭示了有两个主要的损失机制：（i）自猝灭反应，产生过氧化氢（H2O2）和（ii）的H2O2和过氧化氢自由基（HO2OH）的反应。在溶液中，NH4OH与这些清除剂反应，而不是与目标化合物反应。可以利用具有低电流密度、低重复率和短脉冲持续时间的脉冲等离子体来实现高效率。
Many types of plasma processes have been investigated as potential agents for decomposing persistent organic compounds in water using hydroxyl radicals (∙OH), and a wide range of energy efficiency in the reduction of total organic carbon (TOC) has been observed. In this study, loss mechanisms of ∙OH that limit the energy efficiency were investigated using a plasma generated over an acetic acid solution. Various experiments, including the analysis of the decomposition process, a parametric study, and a numerical simulation, revealed that there are two main loss mechanisms: (i) a self-quenching reaction that generates hydrogen peroxide (H2O2) and (ii) a reaction of ∙OH with H2O2 and hydroperoxyl radicals (HO2∙). In the solution, ∙OH reacts with these scavengers rather than target compounds. A pulsed plasma with a low current density, low repetition rate, and short pulse duration can be utilized to achieve high efficiency.