芥子气模拟剂2-氯乙基乙基硫醚的光催化降解  

Study on the Photocatalytic Degradation of a Simulate Agent (2-CEES) of Mustard Gas

作　　者：韩世同[1] 习海玲[2] 付贤智[1] 王绪绪[1] 丁正新[1] 林志聪[1] 苏文悦[1] 

机构地区：[1]福州大学光催化研究所,福州350002 [2]中国人民解放军防化研究院,北京102205

出　　处：《物理化学学报》2004年第3期296-301,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(201330102017300920273014);福建省自然科学基金(2003F0042002H008)~~

摘　　要：利用连续流动微反、原位红外和GC/MS等手段考察了芥子气模拟剂2-氯乙基乙基硫醚(2-CEES)在P25TiO2上的光催化降解反应,证实CO2和H2O是这个反应的最终产物.详细的跟踪分析表明,除了CO2和H2O外,在反应的气相混合物中可检测到C2H4、CH3CHO、CH4、CO、HCl和H2S;少量小分子的羧酸、醚和砜;微量C2H5SC2H5、C2H5S2C2H5、C2H5SC2H4Cl和CH2ClCH2Cl等中间产物;在反应后的催化剂表面可检测到C2H5S2C2H5、C2H5SC2H4OH、C4H9S2C2H5和C2H5S2C2H4OH、SO2-4等物.根据这些结果提出了2-CEES光催化降解的反应机理,推断2-CEES的光催化降解涉及脱氯、C-S键断裂、有机硫化物光聚合和裂解等复杂过程最终转化为CO2和H2O.认为各种硫物种在表面的积聚引起了催化剂的缓慢失活.The Photocatalytic degradation reaction of 2-chloroethyl ethyl sulfide (2-CEES) on P25 TiO2 was studied by using flow micro-reaction technique, GC-MS, and in situ FTIR. It was showed that 2-CEES could be oxidized finally into CO2 and H2O at room temperature during the process. Detailed analysis found that C2H4, CH3CHO, CH4, CO, HCl and H2S; a small quantity of low molecular weight carboxylic acids, ethers and sulphones; a trace amount of C2H5SC2H5,C2H5S2C2H5, C2H5SC2H4Cl and CH2ClCH2Cl exist in the gaseous product of reaction besides CO2 and H2O, and some species such as C2H5S2C2H5, C2H5SC2M4OH, C4H9S2C2H5, C2H5S2C2H4OH and SO42- remain on the surface of the catalyst after reaction. According to the above results, a photocatalytic degradation mechanism of 2-CEES was suggested, deducing that 2-CEES was photocatalytically degraded into CO2 and H2O via a complicated process including dechlorination, C - S bond splitting, photo-polymerization and decompose of organo-sulfur intermediates. The accumulation of sulfur-contained species on the surface was thought to result in deactivation of the catalyst.

关 键 词：芥子气 模拟剂 2-氯乙基乙基硫醚 光催化降解 化学毒剂 化学武器 洗消方法 催化剂活性 反应机理 

分 类 号：O643.3[理学—物理化学]