Photolysis of dimethyl sulfide by microwave electrodeless discharge lamp

doi:10.3969/j.issn.0438-1157.2014.11.052

Abstract

Abstract: Photolysis of dimethyl sulfide (DMS) by microwave electrodeless discharge lamp (MEDL) was conducted in this study. Removal efficiency decreased with increasing inlet concentration of DMS, but could be increased to 94.3% while residence time of DMS in the photo-reactor was kept at 10 s. Direct photolysis and indirect photo-oxidation by excited states of atomic oxygen O(¹D) and radical·OH were regarded as the contribution to DMS degradation in MEDL, especially, O(¹D) played the key role of oxidative species in mineralizing DMS to inorganic chemicals, such as SO₄²^-, CO₂ and H₂O.

Key words: dimethyl sulfide, microwave electrodeless discharge lamp, degradation, oxidation, excited states of atomic oxygen

摘要： 采用微波无极灯(MEDL)光解甲硫醚气体,结果表明,随着进气浓度的增加,甲硫醚去除率相应降低,但其绝对处理量却相应增加;停留时间越长,去除率越大,停留时间为10 s时,降解率高达94.3%.微波无极光化学反应系统中主要产生直接光解、光诱导产生的激发态氧原子O(¹D)和羟基自由基的氧化作用,可将甲硫醚降解转化为硫酸盐、二氧化碳和水等无机化合物,其中激发态氧原子O(¹D)的含量是影响甲硫醚降解的关键因素.

关键词: 甲硫醚, 微波无极灯, 降解, 氧化, 激发态氧原子

CLC Number:

X511

ZHANG Tingting, QI Lei, YU Yang, YU Jiang. Photolysis of dimethyl sulfide by microwave electrodeless discharge lamp[J]. CIESC Journal, 2014, 65(11): 4579-4585.

张婷婷, 祁蕾, 于洋, 余江. 微波无极光降解甲硫醚[J]. 化工学报, 2014, 65(11): 4579-4585.

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