期刊
CHEMOSPHERE
卷 193, 期 -, 页码 198-206出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.11.003
关键词
Photocatalysis; PTR-MS; VOCs mix; Titanium dioxide; Micrometric; Indoor pollution
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chairs program
- Ministere des Relations internationales et de la Francophonie [QU17MO09]
Volatile and semi volatile organic compounds' concentration have dramatically increased in indoor environments in recent years. UV light promotes titanium dioxide, which oxidises various molecules; however, most of the studies report the degradation of a single VOC. Here, we investigate the photo oxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nano metric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transfer reaction mass spectrometer measured online the concentration of all the pollutants simultaneously. Aldehydes compete for the adsorption on both the catalyst's active sites and thus they degrade 70% and 55% with P25 and 1077 respectively. Considering the single pollutant oxidation, instead, aldehydes fully oxidize. Even though benzene is recalcitrant to degradation, P25 and 1077 reduced toluene's concentration to 97% and 96% in 55 min, respectively. Acetonitrile is refractory to photocatalysis. (C) 2017 Published by Elsevier Ltd.
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