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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-chloroethylethyl sulfide (2-CEES) on P25TiO2 was investigated by means of continuous flow microreactor, in situ infrared and GC / MS. It was confirmed that CO2 and H2O were the reaction The detailed trace analysis showed that C2H4, CH3CHO, CH4, CO, HCl and H2S were detected in the gas mixture of the reaction except for CO2 and H2O. A small amount of small molecule carboxylic acids, ethers and sulfones were detected. The trace C2H5SC2H5 , C2H5S2C2H5, C2H5SC2H4Cl and CH2ClCH2Cl and other intermediates.The C2H5S2C2H5, C2H5SC2H4OH, C4H9S2C2H5 and C2H5S2C2H4OH, SO2-4 and so on can be detected on the surface of the catalyst.According to these results, the reaction mechanism of 2-CEES photocatalytic degradation is deduced 2 The photocatalytic degradation of -CEES involves the conversion of dechlorination, CS bond cleavage, photopolymerization and cleavage of organic sulfides to CO2 and H2O ultimately, suggesting that the accumulation of various sulfur species on the surface causes slow deactivation of the catalyst.