气相中嗅味物质—壬醛的真空紫外光降解研究

张竞杰; 张彭义

环境工程学报

张竞杰, 张彭义. 气相中嗅味物质—壬醛的真空紫外光降解研究[J]. 环境工程学报, 2010, 4(6): 1368-1372.

引用本文:

张竞杰, 张彭义. 气相中嗅味物质—壬醛的真空紫外光降解研究[J]. 环境工程学报, 2010, 4(6): 1368-1372.

Zhang Jingjie, Zhang Pengyi. Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet[J]. Chinese Journal of Environmental Engineering, 2010, 4(6): 1368-1372.

Citation:

Zhang Jingjie, Zhang Pengyi. Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet[J]. Chinese Journal of Environmental Engineering, 2010, 4(6): 1368-1372.

气相中嗅味物质—壬醛的真空紫外光降解研究

张竞杰¹,
张彭义¹

1.
清华大学环境科学与工程系，环境模拟与污染控制国家重点实验室，北京 100084
基金项目:
国家高技术研究发展计划（863）项目(2006AA06Z377)

国家重点实验室专项基金(08Y02ESPCT)
中图分类号: X701

Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet

Zhang Jingjie¹,
Zhang Pengyi¹

1.
State Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science & Engineering, Tsinghua University, Beijing 100084，China
Fund Project:

摘要: 在建立热脱附气相色谱法分析气相中低浓度壬醛的基础上，研究了不同条件下真空紫外光对气相中低浓度壬醛的光化学降解。结果表明，壬醛的真空紫外光降解率基本不受初始浓度的影响，在所研究的浓度范围（0.13～1.74 mg/m3）内符合一级动力学，其表观反应速率常数为2.3 min-1。相对湿度一开始增加时均使得不同浓度的壬醛的去除率降低，但低浓度壬醛的降解随后几乎不再受相对湿度变化的影响，而较高浓度壬醛的去除率则先随相对湿度增加而下降，随后则又上升。壬醛能在极干燥的氮气气氛中被真空紫外光降解，同时它在氮气气氛中的降解率随相对湿度的增加而增加，壬醛在极干燥的氮气、空气和氧气气氛中的降解率依次上升，说明真空紫外光直接光解、光解产生的羟基自由基、光解产生的氧原子或臭氧均能导致壬醛的有效降解，且这3种机制相互影响。
- 嗅味物质 /
- 壬醛 /
- 真空紫外光 /
- 光降解 /
- 室内空气
Abstract: The ATD-GC (automatic thermal desorptiongas chromatography) method was established for qualitative and quantitative analysis of n-nonanal, which was used to study the photochemical degradation of low concentration n-nonanal in the gas phase induced by vacuum ultraviolet. It was showed that the degradation rate of n-nonanal was little influenced by its inlet concentration, and the reaction followed the first-order kinetics with the apparent first-order reaction rate constant of 2.3 min-1 when the inlet concentration was in the range 0.13～1.74 mg/m3. The removal rate of n-nonanal decreased with increasing relative humidity for both the highand low-inlet concentration cases, but with further increases of relative humidity, they behaved differently: the removal rate of n-nonanal in the low-inlet-concentration case changed little while in the high-inlet-concentration case it decreased first and then increased again. n-nonanal could be photolyzed in dry pure nitrogen atmosphere and the degradation rate increased with the increasing humidity. The effects of different carrier gases were investigated and compared. The degradation rate of n-nonanal was in the following sequence: N2 2. It was suggested that in the process of vacuum ultraviolet-induced photochemical degradation the direct photolysis, photo-generated hydroxyl radicals and oxygen atom/ozone all contribute to the removal of n-nonanal and these three mechanisms interact with each other.
- odorous substances /
- n-nonanal /
- vacuum ultraviolet /
- photochemical degradation /
- indoor air

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张竞杰, 张彭义. 气相中嗅味物质—壬醛的真空紫外光降解研究[J]. 环境工程学报, 2010, 4(6): 1368-1372.

引用本文:

张竞杰, 张彭义. 气相中嗅味物质—壬醛的真空紫外光降解研究[J]. 环境工程学报, 2010, 4(6): 1368-1372.

Zhang Jingjie, Zhang Pengyi. Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet[J]. Chinese Journal of Environmental Engineering, 2010, 4(6): 1368-1372.

Citation:

Zhang Jingjie, Zhang Pengyi. Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet[J]. Chinese Journal of Environmental Engineering, 2010, 4(6): 1368-1372.

气相中嗅味物质—壬醛的真空紫外光降解研究

张竞杰¹,
张彭义¹

1. 清华大学环境科学与工程系，环境模拟与污染控制国家重点实验室，北京 100084

收稿日期: 2009-07-03

基金项目:

国家高技术研究发展计划（863）项目(2006AA06Z377)

国家重点实验室专项基金(08Y02ESPCT)

关键词:

摘要: 在建立热脱附气相色谱法分析气相中低浓度壬醛的基础上，研究了不同条件下真空紫外光对气相中低浓度壬醛的光化学降解。结果表明，壬醛的真空紫外光降解率基本不受初始浓度的影响，在所研究的浓度范围（0.13～1.74 mg/m3）内符合一级动力学，其表观反应速率常数为2.3 min-1。相对湿度一开始增加时均使得不同浓度的壬醛的去除率降低，但低浓度壬醛的降解随后几乎不再受相对湿度变化的影响，而较高浓度壬醛的去除率则先随相对湿度增加而下降，随后则又上升。壬醛能在极干燥的氮气气氛中被真空紫外光降解，同时它在氮气气氛中的降解率随相对湿度的增加而增加，壬醛在极干燥的氮气、空气和氧气气氛中的降解率依次上升，说明真空紫外光直接光解、光解产生的羟基自由基、光解产生的氧原子或臭氧均能导致壬醛的有效降解，且这3种机制相互影响。

English Abstract

Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet

Zhang Jingjie¹,
Zhang Pengyi¹

1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science & Engineering, Tsinghua University, Beijing 100084，China

Received Date: 2009-07-03

Fund Project:

Keywords:

Abstract: The ATD-GC (automatic thermal desorptiongas chromatography) method was established for qualitative and quantitative analysis of n-nonanal, which was used to study the photochemical degradation of low concentration n-nonanal in the gas phase induced by vacuum ultraviolet. It was showed that the degradation rate of n-nonanal was little influenced by its inlet concentration, and the reaction followed the first-order kinetics with the apparent first-order reaction rate constant of 2.3 min-1 when the inlet concentration was in the range 0.13～1.74 mg/m3. The removal rate of n-nonanal decreased with increasing relative humidity for both the highand low-inlet concentration cases, but with further increases of relative humidity, they behaved differently: the removal rate of n-nonanal in the low-inlet-concentration case changed little while in the high-inlet-concentration case it decreased first and then increased again. n-nonanal could be photolyzed in dry pure nitrogen atmosphere and the degradation rate increased with the increasing humidity. The effects of different carrier gases were investigated and compared. The degradation rate of n-nonanal was in the following sequence: N2 2. It was suggested that in the process of vacuum ultraviolet-induced photochemical degradation the direct photolysis, photo-generated hydroxyl radicals and oxygen atom/ozone all contribute to the removal of n-nonanal and these three mechanisms interact with each other.

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气相中嗅味物质—壬醛的真空紫外光降解研究

Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet

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气相中嗅味物质—壬醛的真空紫外光降解研究

English Abstract

Study on photochemical degradation of nonanal-an odorant in gas phase by vacuum ultraviolet

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