Fast purification of air from diethyl sulfide with nanosized TiO2 aerosol

Authors:  Alexander V. Vorontsov, Alexey S. Besov, Valentin N. Parmon

Abstract:
TiO₂ aerosol generated by a sonic method has been applied for fast purification of air from diethyl sulfide (DES) vapors inside a closed chamber. Two types of experiments modeling the possible real situations were conducted – (1) aerosol spraying without irradiation followed by UV irradiation after aerosol deposition and (2) aerosol spraying under UV irradiation. Adsorption of DES on TiO₂ particles was complete and fastest at the lowest air relative humidity (RH) while photocatalytic oxidation was fastest at RH 37%. The minimal TiO₂ aerosol surface area needed to remove from air one DES molecule is 2.3 nm2 at the adsorption and 1.5 nm2 at the photocatalytic oxidation. The quantum efficiency of the DES consumption increases from 4.7 to 20% when the initial DES concentration increases from 100 to 1000 ppm. The overall quantum efficiency of the DES deep oxidation reached 41 and 58% for the initial concentration 100 and 1000 ppm, respectively. The results demonstrate unusually high activity of TiO₂ aerosol for the adsorption-photocatalytic air purification from DES.

Keywords:
Atmospheric chemistry
CWA
Photocatalysis
Titanium dioxide
Titania
Decontamination
Anti-terrorism
Water concentration
Gas phase
Static
Nanoparticles
Sulfide
Troposphere

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Fast purification of air from diethyl sulfide with nanosized TiO2 aerosol

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