Photocatalytic oxidation of toluene at indoor air levels (ppbv): Towards a better assessment of conversion, reaction intermediates and mineralization

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Photocatalytic oxidation of toluene at indoor air levels (ppbv): Towards a better assessment of conversion, reaction intermediates and mineralization

Mohamad Sleiman - Nama Orang; Pierre Conchon - Nama Orang; Corinne Ferronato - Nama Orang; Jean-Marc Chovelon - Nama Orang;

Abstract.
We report here a new analytical methodology for the investigation of toluene photocatalytic removal at
indoor-relevant concentration level (ppbv). Experiments were performed using an annular flow-through
reactor with TiO2 as photocatalyst, toluene as a model VOC and under different ranges of relative
humidity (RH: 0–70%), inlet concentration (20–400 ppbv) and flow rate (70–350 mL min1). Analysis of
reaction intermediates was conducted using an automated thermal desorption technique coupled to GC–MS instrument (ATD–GC–MS) whereas a GC coupled to pulsed discharge helium ionization detector (GC–PDPID) was used for the first time for on-line measurements of CO and CO2 at ppbv level. Under these conditions, toluene conversion was up to 90–100% with a slight influence of inlet concentration and RH, whereas flow rate was found to be a prevalent factor. Mineralization (%) varied from 55 to 95% and has shown to be strongly inhibited by the increase of RH whereas flow rate and inlet concentration exhibited a negligible effect. The reaction intermediates were found to be different according to the RH level: in absence of water vapor, traces of low molecular weight carbonyls (formaldehyde, methyl glyoxal, etc.) were detected and quantified in the gas phase whereas at RH 40%, hydroxylated intermediates such as cresols and benzyl alcohol were observed. On the basis of identification results, a reaction mechanism was proposed involving mainly direct hole oxidation at dry conditions and hydroxylation by OH radicals at high RH level.

Keywords: Photocatalysis, VOC, Toluene, Indoor air, Reaction products

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Judul Seri: Applied Catalysis B: Environmental
No. Panggil: -
Penerbit: London : Elsevier B.V.., 2009
Deskripsi Fisik: Applied Catalysis B: Environmental 86 (2009) 159–165
Bahasa: English
ISBN/ISSN: -
Klasifikasi: -
Tipe Isi: -
Tipe Media: -
Tipe Pembawa: -
Edisi: -
Subjek: KIMIA
Info Detail Spesifik: -
Pernyataan Tanggungjawab: agus

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Photocatalytic oxidation of toluene at indoor air levels (ppbv): Towards a better assessment of conversion, reaction intermediates and mineralization

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