Titanium dioxide mediated heterogeneous photocatalytic degradation of gaseous dimethyl sulfide: Parameter study and reaction pathways

Application of advanced oxidation processes for treatment of air from livestock and industrial facilities

“…The laboratory methods include gas chromatography with mass spectrometry (GC/MS) and other detectors, such as flame ionisation detector (FID) for general organic compounds, and flame photometric detector (FPD) and sulphur chemiluminescence detector (SCD) specific for sulphur compounds [8][9][10][11][12][13]. Current sampling methods coupled with the laboratory methods include sampling with adsorbent tubes [14,15], sampling bags and canisters [16,17] and solid-phase microextraction (SPME) [16,[18][19][20].…”

“…Another interesting issue is that in most of the studies, odorous compounds have been mostly measured by GC/FID, GC/FPD or GC/MS [10][11][12][13]. Application of direct online MS, on the other hand, is advantageous with respect to avoiding sampling artefacts and obtaining extensive datasets with high time resolution and high precision.…”

“…Furthermore, photocatalytic oxidation is not suitable for treating contaminated air with high concentrations of sulphur compounds, because their by-products, such as sulphate (SO 4 2-) or methane sulphonic acid, may bind to the surface of the photocatalyst and cause the deactivation of the photocatalyst [11]. However, Demeestere et al reported that low concentrations of DMS (< 3 ppmv) would not deactivate the TiO 2 , and relative humidity between 18.9% and 52.9% would not affect the removal of DMS either [11]. The photocatalysis technology could therefore be a viable solution for the abatement of reduced sulphur compounds emissions as a post-stage treatment after air scrubbers.…”

“…2) The photocatalytic oxidation process has been studied for many organic compounds in gas phase [11,100,[107][108][109][110].…”

“…The honeycomb-type photocatalytic reactor was selected to assess the removal of odorous compounds in this PhD-project. In most studies, photocatalytic oxidation of reduced sulphur compounds was carried out at ppm level (ten to hundreds ppmv) [11,12,113,162,166,167] for relatively long residence time (from several seconds to several minutes) for adsorbing more contaminants on the TiO 2 surface [10-12, 113, 162, 166, 168].…”