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首页> 外文期刊>Environmental Science & Technology >Online Monitoring of Molecular Processes in a Plasma Air Purifying System
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Online Monitoring of Molecular Processes in a Plasma Air Purifying System

机译：在线监测等离子空气净化系统中的分子过程

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摘要

Plasma air purifying systems present an interesting alternative to filters for purifying air. In this study, molecular processes in a commercially available ac driven plasma air purifier were studied in detail. This air purifier is supposed to reduce all air contaminants to small nontoxic molecules (e.g., H_2O and CO_2). However, degradation mechanisms are not yet fully understood. In this study, we investigated the exhaust of the plasma air purifier to determine which degradation products are formed. An interface was designed and constructed to allow the direct coupling of the plasma air purifier's exhaust to a mass spectrometer. The compounds studied, primary and secondary amines, were introduced at a concentration of 1 ppmV. Contrary to our expectations, polymerization instead of degradation was observed. The higher the ac voltage applied (max. 9.0 kV) to the plasma air purifier, the higher the mass of the oligomer distribution. Side chain oxidation products as well as oligomers could be observed for all compounds tested. Starting with amines of low mass (m/z < 200), compounds of molecular masses above 1000 Da were observed in the plasma air purifier. Detailed analysis of the observed mass spectra as well as experiments with deuterated dibutylamine helped to unravel the mechanism taking place in the plasma air purifier. Nitrate anions generated in the plasma air purifier (presumably from N_2) are proposed to form ionic clusters with protonated amines.
机译：等离子空气净化系统是用于净化空气的过滤器的有趣替代品。在这项研究中，详细研究了市售的交流驱动等离子体空气净化器中的分子过程。该空气净化器被认为可以将所有空气污染物减少为小的无毒分子（例如H_2O和CO_2）。但是，降解机理尚未完全理解。在这项研究中，我们调查了等离子空气净化器的排气，以确定形成了哪些降解产物。设计和构造了一个接口，以允许将等离子空气净化器的废气直接连接到质谱仪上。所研究的化合物伯胺和仲胺的浓度为1 ppmV。与我们的预期相反，观察到聚合而不是降解。施加到等离子空气净化器的交流电压越高（最大9.0 kV），低聚物分布的质量就越高。对于所有测试的化合物，均可以观察到侧链氧化产物以及低聚物。从低质量的胺（m / z <200）开始，在等离子空气净化器中观察到分子量大于1000 Da的化合物。对观察到的质谱图的详细分析以及使用氘化二丁胺的实验有助于阐明等离子体空气净化器中发生的机理。提出在等离子体空气净化器中产生的硝酸根阴离子（可能来自N_2）与质子化胺形成离子簇。

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  • 来源
    《Environmental Science & Technology》 |2012年第7期|p.4067-4073|共7页
  • 作者

    Stefan Schmid; Lukas Meier; Christian Berchtold; Renato Zenobi;

  • 作者单位

    ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich Switzerland;

    ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich Switzerland;

    ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich Switzerland;

    ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich Switzerland;

  • 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);美国《化学文摘》(CA);
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  • 正文语种 eng
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