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首页> 外文期刊>Separation and Purification Technology >Gliding Arc Discharge (GAD) assisted catalytic degradation of bisphenol A in solution with ferrous ions
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Gliding Arc Discharge (GAD) assisted catalytic degradation of bisphenol A in solution with ferrous ions

机译：滑弧放电（GAD）有助于亚铁离子溶液中双酚A的催化降解

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摘要

The degradation of an endocrine disruptor (ED), the bisphenol A (BPA), was studied using Gliding Arc Discharge (GAD). This kind of discharge generates a non-thermal plasma at atmospheric pressure and quasi-ambient temperature. The resulting plasma is the source of several chemical reactions that lead to the hydroxyl radical formation. Hydroxyl radicals, ~·OH, are very powerful and non-selective oxidizing agents (E°_(~·OH/H2O) 2.8 V vs. normal hydrogen electrode) able to degrade compounds resistant to conventional treatment GAD belongs to the group of advanced oxidation processes (AOPs).Under different working gases such as air, argon, oxygen/argon mixture (20/80, v/v), a BPA aqueous solution (120 μM) was submitted to GAD. The evolution of BPA concentration was followed by high per- formance liquid chromatography (HPLC) method. The global oxidation of the organic matter was followed by chemical oxygen demand (COD) measurement. The mineralization was determined from the total organic carbon (TOC). The GAD treatment of the aqueous solution is accompanied by a massive production of hydrogen peroxide. The addition of Fe (II) to the reaction allows a better elimination of the organic matter through the production of additional ~·OH radicals, issued from the decomposition of hydrogen peroxide according to Fenton reaction. The optimized system - GAD with oxygen/argon (20/80) as working gas, in presence of Fe (II) - was very efficient for BPA treatment: the compound disappeared after 30 min, the abatement of the COD was total after 120 min and the TOC diminished by 70%.
机译：使用滑弧放电（GAD）研究了内分泌干扰物（ED），双酚A（BPA）的降解。这种放电会在大气压和准环境温度下产生非热等离子体。产生的等离子体是导致羟基自由基形成的几种化学反应的来源。羟基自由基〜·OH是非常强大的非选择性氧化剂（相对于普通氢电极，E°_（〜·OH / H2O）2.8 V）能够降解对常规处理有抗性的化合物GAD属于先进的氧化过程（AOP）在不同的工作气体如空气，氩气，氧气/氩气混合物（20/80，v / v）下，将BPA水溶液（120μM）提交给GAD。高效液相色谱（HPLC）方法跟踪BPA浓度的变化。在有机物的整体氧化之后，进行化学需氧量（COD）测量。根据总有机碳（TOC）确定矿化程度。水溶液的GAD处理伴随大量生成过氧化氢。向反应中添加铁（II）可以通过产生额外的〜·OH自由基来更好地消除有机物，该自由基由Fenton反应根据过氧化氢的分解而产生。优化的系统-氧气/氩气（20/80）作为工作气体，在铁（II）的存在下GAD对于BPA处理非常有效：化合物在30分钟后消失，在120分钟后COD总量减少并且TOC减少了70％。

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