Effective radical formation and VOC decomposition using pulsed discharge plasma above an water surface

研究在水面上产生的放电等离子体的特性、由等离子体产生的自由基和分解特性，以开发使用放电等离子体的VOC（挥发性有机化合物）处理。测量了水面上放电等离子体的光辐射，并由此导出了等离子体中电子的基本性质--电子温度Te和电子密度ne。本文用原位红外吸收光谱法研究了Ar-O_2气氛中水面直流电晕放电产生的自由基。放电等离子体中产生了HO_2自由基。采用气相色谱-质谱联用技术研究了苯酚水溶液在脉冲放电等离子体作用下的分解副产物，推测了苯酚的分解过程。

The characteristics of discharge plasma generated above water, produced radicals by the plasma and decomposition characteristics are investigated to develop VOC (Volatile Organic Compound) treatment using the discharge plasma. The optical emission from discharge plasma generated above a water surface are measured, and then electron temperature Te and density ne, which show fundamental property of electrons in the plasma, are deduced. Radicals produced in an atmospheric DC corona discharge above water in Ar-O_2 are investigated by in-situ infrared absorption spectroscopy. HO_2 radicals found to be produced in the discharge plasma. By-products from phenol by exposure of pulsed-discharge plasma above a phenol aqueous solution are investigated by gas chromatograph mass spectrometry, and the decomposition process of phenol is deduced.