Stucchi Marta, Galli Federico, Bianchi Claudia L, Pirola Carlo, Boffito Daria C, Biasioli Franco, Capucci Valentino
Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada.
Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada.
Chemosphere. 2018 Feb;193:198-206. doi: 10.1016/j.chemosphere.2017.11.003. Epub 2017 Nov 5.
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 TiO efficacy. We compare P25, a nanometric 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.
近年来，室内环境中挥发性和半挥发性有机化合物的浓度急剧增加。紫外线能促进二氧化钛，后者可氧化各种分子；然而，大多数研究报告的是单一挥发性有机化合物的降解情况。在此，我们研究17种混合分子的光氧化过程，以对二氧化钛的功效进行实际测试。我们比较了纳米级催化剂P25和微米级样品1077，后者对健康的危害较小。质子转移反应质谱仪在线同时测量所有污染物的浓度。醛类竞争催化剂活性位点上的吸附，因此它们在P25和1077作用下的降解率分别为70%和55%。相反，就单一污染物氧化而言，醛类会完全氧化。尽管苯难以降解，但P25和1077分别在55分钟内将甲苯浓度降低至97%和96%。乙腈对光催化具有抗性。
