Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters
Airborne fine particulate matter (PM<sub>2.5</sub>) pollution is known to have adverse effects on human health, and owing to their carcinogenic and mutagenic nature, polycyclic aromatic hydrocarbons (PAHs) are of particular concern. This study investigated the effect of ultraviolet (UV)-...
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MDPI AG
2021-03-01
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| Online Access: | https://www.mdpi.com/2073-4344/11/3/400 |
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| author | Koki Sohara Katsuya Yamauchi Xu Sun Kazuhiro Misawa Yoshika Sekine |
| author_facet | Koki Sohara Katsuya Yamauchi Xu Sun Kazuhiro Misawa Yoshika Sekine |
| author_sort | Koki Sohara |
| collection | DOAJ |
| description | Airborne fine particulate matter (PM<sub>2.5</sub>) pollution is known to have adverse effects on human health, and owing to their carcinogenic and mutagenic nature, polycyclic aromatic hydrocarbons (PAHs) are of particular concern. This study investigated the effect of ultraviolet (UV)-induced photocatalysis on the degradation of PAHs in PM<sub>2.5</sub>, employing titanium dioxide (TiO<sub>2</sub>)-supporting quartz fibre filters. A TiO<sub>2</sub> layer was formed on the quartz fibre filters, and airborne PM<sub>2.5</sub> was collected using an air sample at a flow rate of 500 L/min for 24 h. The PM<sub>2.5</sub> samples were subsequently irradiated with ultraviolet rays at 1.1 mW/cm<sup>2</sup>. The amounts of nine targeted PAHs (phenanthrene, PHE; anthracene, ANT; pyrene, PYR; benzo[a]anthracene, BaA; chrysene, CHR; benzo[b]fluoranthene, BbF; benzo[k]fluoranthene, BkF; benzo[a]pyrene, BaP; and benzo[g,h,i]perylene, BgP) gradually decreased during the treatment, with half-lives ranging from 18 h (PHE) to 3 h (BaP), and a significantly greater reduction was found in comparison with the PAHs collected in the control (non-TiO<sub>2</sub> coated) quartz fibre filters. However, the degradation rates were much faster when the PAHs were in direct contact with the TiO<sub>2</sub> layer. As PM<sub>2.5</sub> is a mixture of various kinds of solids, co-existing components can be a rate-determining factor in the UV-induced degradation of PAHs. This was demonstrated by a remarkable increase in degradation rates following the removal of co-existing salts from the PM<sub>2.5</sub> using water treatment. |
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| last_indexed | 2024-03-10T13:00:40Z |
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| spelling | doaj.art-1d4afe3cb40245168940f04405b468f52023-11-21T11:30:08ZengMDPI AGCatalysts2073-43442021-03-0111340010.3390/catal11030400Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre FiltersKoki Sohara0Katsuya Yamauchi1Xu Sun2Kazuhiro Misawa3Yoshika Sekine4Graduate School of Earth and Environmental Sciences, Tokai University, Kanagawa 259-1292, JapanGraduate School of Science, Tokai University, Kanagawa 259-1292, JapanGraduate School of Earth and Environmental Sciences, Tokai University, Kanagawa 259-1292, JapanGraduate School of Earth and Environmental Sciences, Tokai University, Kanagawa 259-1292, JapanGraduate School of Earth and Environmental Sciences, Tokai University, Kanagawa 259-1292, JapanAirborne fine particulate matter (PM<sub>2.5</sub>) pollution is known to have adverse effects on human health, and owing to their carcinogenic and mutagenic nature, polycyclic aromatic hydrocarbons (PAHs) are of particular concern. This study investigated the effect of ultraviolet (UV)-induced photocatalysis on the degradation of PAHs in PM<sub>2.5</sub>, employing titanium dioxide (TiO<sub>2</sub>)-supporting quartz fibre filters. A TiO<sub>2</sub> layer was formed on the quartz fibre filters, and airborne PM<sub>2.5</sub> was collected using an air sample at a flow rate of 500 L/min for 24 h. The PM<sub>2.5</sub> samples were subsequently irradiated with ultraviolet rays at 1.1 mW/cm<sup>2</sup>. The amounts of nine targeted PAHs (phenanthrene, PHE; anthracene, ANT; pyrene, PYR; benzo[a]anthracene, BaA; chrysene, CHR; benzo[b]fluoranthene, BbF; benzo[k]fluoranthene, BkF; benzo[a]pyrene, BaP; and benzo[g,h,i]perylene, BgP) gradually decreased during the treatment, with half-lives ranging from 18 h (PHE) to 3 h (BaP), and a significantly greater reduction was found in comparison with the PAHs collected in the control (non-TiO<sub>2</sub> coated) quartz fibre filters. However, the degradation rates were much faster when the PAHs were in direct contact with the TiO<sub>2</sub> layer. As PM<sub>2.5</sub> is a mixture of various kinds of solids, co-existing components can be a rate-determining factor in the UV-induced degradation of PAHs. This was demonstrated by a remarkable increase in degradation rates following the removal of co-existing salts from the PM<sub>2.5</sub> using water treatment.https://www.mdpi.com/2073-4344/11/3/400polycyclic aromatic hydrocarbons (PAHs)particulate matter (PM<sub>2.5</sub>)photocatalysisquartz fibre filterTiO<sub>2</sub>degradation |
| spellingShingle | Koki Sohara Katsuya Yamauchi Xu Sun Kazuhiro Misawa Yoshika Sekine Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters Catalysts polycyclic aromatic hydrocarbons (PAHs) particulate matter (PM<sub>2.5</sub>) photocatalysis quartz fibre filter TiO<sub>2</sub> degradation |
| title | Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters |
| title_full | Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters |
| title_fullStr | Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters |
| title_full_unstemmed | Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters |
| title_short | Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM<sub>2.5</sub>) Collected on TiO<sub>2</sub>-Supporting Quartz Fibre Filters |
| title_sort | photocatalytic degradation of polycyclic aromatic hydrocarbons in fine particulate matter pm sub 2 5 sub collected on tio sub 2 sub supporting quartz fibre filters |
| topic | polycyclic aromatic hydrocarbons (PAHs) particulate matter (PM<sub>2.5</sub>) photocatalysis quartz fibre filter TiO<sub>2</sub> degradation |
| url | https://www.mdpi.com/2073-4344/11/3/400 |
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