脉冲电晕等离子体降解有毒气体

采用脉冲电晕放电等离子体对化学毒剂模拟剂氯膦酸二乙酯(DECP)进行降解,结果表明,对初始浓度为70 mg·m-3的DECP降解率为96.4%.通过GC-MS和离子色谱分析,其降解产物主要有CHCl2-CH2Cl、CHCl2-CHCl2、二氯膦酸乙酯、HCl和H3PO4,并根据降解产物探讨了等离子体对DECP的降解反应机理.DECP分子中的P—Cl和C—O键断裂促使DECP矿化为H3PO4和HCl,而C—O键断裂形成的乙基与氯自由基反应形成CHCl2-CH2Cl和CHCl2-CHCl2;同时DECP分子中的一个P—O键发生断裂后与氯自由基结合形成了二氯膦酸乙酯.对DECP的反应动力学进行了分析讨论,得到其反应速率常数为0.0516 m.3(W.h)-1.

Decomposition of toxic gas by pulse corona plasma

The decomposition of diethyl chlorophosphate(DECP) by pulse corona discharge plasma was investigated.The results show that the decomposition efficiency reached 96.4% when the initial concentration was 70 mg·m-3.The decomposition products were CHCl2-CH2Cl,CHCl2-CHCl2,ethyl dichloro phosphate,HCl and H3PO4,analyzed by GC-MS and ion chromatograph.The reaction mechanism of DECP in plasma system was discussed according to the decomposition products.The chemical bonds of P—Cl and C—O are fractured,which makes DECP mineralized to H3PO4 and HCl.Ethyl,derived from the fracture of C—O bond,reacts with chlorine radical to form CHCl2-CH2Cl and CHCl2-CHCl2.A P—O bond is fractured and reacts with chlorine radical to form ethyl dichloro phosphate.The reaction kinetic of DECP was also analyzed and discussed,and the reaction rate constant of DECP was 0.0516 m3 ·(W·h)-1.