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 photooxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nanometric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transferreaction 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.

Simultaneous photodegradation of VOC mixture by TiO2 powders / M. Stucchi, F. Galli, C..L..M. Bianchi, C. Pirola, D..C. Boffito, F. Biasioli, V. Capucci. - In: CHEMOSPHERE. - ISSN 0045-6535. - 193(2018 Feb), pp. 198-206. [10.1016/j.chemosphere.2017.11.003]

Simultaneous photodegradation of VOC mixture by TiO2 powders

M. Stucchi;F. Galli;C..L..M. Bianchi;C. Pirola;
2018

Abstract

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 photooxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nanometric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transferreaction 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.
Indoor pollution; Micrometric; PTR-MS; Photocatalysis; Titanium dioxide; VOCs mix
Settore CHIM/04 - Chimica Industriale
Settore ING-IND/25 - Impianti Chimici
5-nov-2017
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/529344
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