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首页> 外文期刊>International journal of environmental analytical chemistry >Analysis of gas phase intermediates and mineralization during the photocatalytic oxidation of organic pollutants: a critical step towards the performance evaluation
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Analysis of gas phase intermediates and mineralization during the photocatalytic oxidation of organic pollutants: a critical step towards the performance evaluation

机译：分析有机污染物的光催化氧化过程中的气相中间体和矿化作用：性能评估的关键一步

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摘要

This work illustrates the capabilities of two advanced analytical methods, Automated Thermal Desorption/Gas Chromatography/Mass Spectrometry, (ATD/GC/MS) and Gas Chromatography, Pulse Discharge Helium Ionization Detector, (GC/PDHID) for a better understanding of the photocatalytic degradation of organic compounds in air at ppb_V levels. For this purpose two compounds, viz. dichlorvos and 2-propanol were chosen and the influence of relative humidity (RH%) on the oxidation efficiency was investigated. According to the RH levels, different mechanisms of degradation as well as rate of mineralization were proposed. For example at 40% RH, the main reaction intermediates coming from dichlorvos degradation was dichloroacetaldehyde while traces of phosgene were observed. In contrast, at 0% RH, trichloroace-taldehyde was found to be the main intermediate and a higher amount of phosgene was observed. When only the conversion rate was followed, it was impossible to assess the photocatalytic efficiency of the air cleaning system since whatever RH values considered, high rates of conversion were always measured. However using PDHID detector it was possible to calculate the rate of mineralization which varies drastically as a function of RH: a decrease in the mineralization rate with increasing RH is shown. In addition, it was shown that during photocatalytic treatment of bilge water in an aerated reactor, volatile organic compounds (VOCs) were emitted which are potential source of pollution for workers in engine room. In this case, an additional treatment of the gaseous phase would be necessary.
机译：这项工作说明了两种先进的分析方法的功能，即自动热脱附/气相色谱/质谱（ATD / GC / MS）和气相色谱，脉冲放电氦电离检测器（GC / PDHID），以更好地了解光催化ppb_V水平下空气中有机化合物的降解。为此目的，两种化合物。选择敌敌畏和2-丙醇，研究了相对湿度（RH％）对氧化效率的影响。根据相对湿度水平，提出了不同的降解机理和矿化速率。例如，在40％RH下，来自敌敌畏降解的主要反应中间体是二氯乙醛，同时观察到痕量的光气。相反，在0％RH下，发现三氯乙醛是主要的中间体，并且观察到较高的光气量。当仅遵循转化率时，就无法评估空气净化系统的光催化效率，因为无论考虑哪个RH值，总会测出高转化率。但是，使用PDHID检测器可以计算出随RH急剧变化的矿化速率：显示出矿化速率随RH的增加而降低。此外，研究表明，在曝气反应器中舱底水的光催化处理过程中，会释放出挥发性有机化合物（VOC），这是机舱工人的潜在污染源。在这种情况下，将需要对气相进行另外的处理。

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  • 作者

    David Cazoir; Daniel Vildozo; Mohamad Sleiman; Corinne Ferronato; Ludovic Fine; Jean-Marc Chovelon;

  • 作者单位

    Universite de Lyon, Universite Lyon 1, Institut de Recherche sur la Catalyse et I'Environnement, (IRCELYON), UMR CNRS 5256, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France;

    Universite de Lyon, Universite Lyon 1, Institut de Recherche sur la Catalyse et I'Environnement, (IRCELYON), UMR CNRS 5256, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France;

    Universite de Lyon, Universite Lyon 1, Institut de Recherche sur la Catalyse et I'Environnement, (IRCELYON), UMR CNRS 5256, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France;

    Universite de Lyon, Universite Lyon 1, Institut de Recherche sur la Catalyse et I'Environnement, (IRCELYON), UMR CNRS 5256, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France;

    Universite de Lyon, Universite Lyon 1, Institut de Recherche sur la Catalyse et I'Environnement, (IRCELYON), UMR CNRS 5256, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France;

    Universite de Lyon, Universite Lyon 1, Institut de Recherche sur la Catalyse et I'Environnement, (IRCELYON), UMR CNRS 5256, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    indoor air pollution; photocatalysis; reaction intermediates; mineralization; ATD/GC/MS; GC/PDHID; dichlorvos; 2-propanol; bilge water;

    机译：室内空气污染;光催化;反应中间体矿化ATD / GC / MS;GC / PDHID;敌敌畏2-丙醇;舱底水;

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