羰基硫的光氧化反应研究  

The Photo-oxidation of COS

作　　者：张峰[1] 吴洪波[1] 薛华欣[1] 吴蓓莉[1] 陈建民[1] 

机构地区：[1]复旦大学环境科学与工程系,上海200433

出　　处：《复旦学报（自然科学版）》2003年第3期319-323,共5页Journal of Fudan University：Natural Science

基　　金：国家教育部归国留学人员基金资助项目

摘　　要：以熔凝紫外灯作为光源,利用FT IR、怀特池、GC MS、XPS等技术考察了COS与O2混合体系中COS的光氧化反应情况.结果表明,在紫外光照射下,COS能迅速光氧化分解,主要产物有CO2和SO2,光化学反应产生的部分SO2进一步氧化,以SO42-的形式大量存在.COS在紫外光光照下的光氧化反应遵循一级反应动力学规律,反应表观速率常数达10-4～10-3s-1.O2的分压对COS光氧化速率有影响,随着氧量的增加,COS光氧化速率的增长逐渐趋于平缓.这为在光的作用下,大气中COS通过光化学反应形成SO2,形成硫酸盐气溶胶提供了实验依据.The photooxidation of COS under the irradiation of ultraviolet light, has been studied in the COSO2 system. The reaction was explored through FTIR, White Cell, XPS and GCMS. The result showed that the major photooxidation products of COS under the irradiation of ultraviolet light were CO2 and SO2 in COSO2 system. SO42- was identified due to the further oxidation of SO2. The added O2 had a positive influence on the conversion of COS. With the increasing of O2, the apparent rate constants of photooxidation increased first, then the increament decreased gradually. The results indicated that the photooxidation of COS under irradiation of ultraviolet was apparent firstorder reaction. The apparent rate constant is 10-4-10-3 s-1.The experiment provides evidences for the photooxidation of COS in the atmosphere and the formation of sulfate aerosols.

关 键 词：COS 光氧化 紫外光 怀特池 

分 类 号：O614.41[理学—无机化学]