物理化学学报 >> 2004, Vol. 20 >> Issue (03): 296-301.doi: 10.3866/PKU.WHXB20040316

研究论文 上一篇    下一篇

芥子气模拟剂2-氯乙基乙基硫醚的光催化降解

韩世同;习海玲;付贤智;王绪绪;丁正新;林志聪;苏文悦   

  1. 福州大学光催化研究所,福州 350002; 中国人民解放军防化研究院,北京 102205
  • 收稿日期:2003-08-22 修回日期:2003-12-01 发布日期:2004-03-15
  • 通讯作者: 王绪绪 E-mail:xwang@fzu.edu.cn

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

Han Shi-Tong;Xi Hai-Ling;Fu Xian-Zhi;Wang Xu-Xu;Ding Zheng-Xin;Lin Zhi-Cong;Su Wen-Yue   

  1. Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002;The Academy of Chemical Defence, The People’s Liberation Army, Beijing 102205
  • Received:2003-08-22 Revised:2003-12-01 Published:2004-03-15
  • Contact: Wang Xu-Xu E-mail:xwang@fzu.edu.cn

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P25 TiO2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、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.

关键词: 2-氯乙基乙基硫醚(2-CEES), 光催化降解, 反应机理, 洗消

Abstract: 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, C2H5SC2H4OH, 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.

Key words: 2-chloroethyl ehtyl sulfide(2-CEES), Photocatalytic degradation,  Reaction mechanism, Disinfection