Photocatalytic degradation of atmospheric fine particulate matter (PM<sub>2.5</sub>) collected on TiO<sub>2</sub> supporting quartz fibre filter

Misawa, Kyoko; Sekine, Yoshika; Kusukubo, Yuki; Sohara, Koki

doi:10.1080/09593330.2018.1530696

Cited by 23 publications

(23 citation statements)

References 20 publications

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“…Photocatalysis, which involves the use of light and a solid catalyst, is capable of completely mineralizing many air contaminants (Ollis, 2000), thereby converting them to products that are less harmful for human health and environmentally more acceptable (de Richter and Caillol, 2011). It can decompose constituents of PM (de Richter and Caillol, 2011;Misawa et al, 2020), and remove NO x from the air (Nguyen et al, 2020). High removal percentages are typically obtained under laboratory conditions, e.g.…”

Section: Available Local Mitigation Measuresmentioning

confidence: 99%

Application of Improved CFD Modeling for Prediction and Mitigation of Traffic-Related Air Pollution Hotspots in a Realistic Urban Street

Lauriks

Longo

Baetens

et al. 2021

Atmospheric Environment

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The correct prediction of air pollutants dispersed in urban areas is of paramount importance to safety, public health and a sustainable environment. Vehicular traffic is one of the main sources of nitrogen oxides (NO x ) and particulate matter (PM), strongly related to human morbidity and mortality. In this study, the pollutant level and distribution in a section of one of the main road arteries of Antwerp (Belgium, Europe) are analyzed. The assessment is performed through computational fluid dynamics (CFD), acknowledged as a powerful tool to predict and study dispersion phenomena in complex atmospheric environments. The two main traffic lanes are modeled as emitting sources and the surrounding area is explicitly depicted. A Reynolds-averaged Navier-Stokes (RANS) approach specific for Atmospheric Boundary Layer (ABL) simulations is employed. After a validation on a wind tunnel urban canyon test case, the dispersion within the canopy of two relevant urban pollutants, nitrogen dioxide (NO 2 ) and particulate matter with an aerodynamic diameter smaller than 10 µm (PM 10 ), is studied. An experimental field campaign led to the availability of wind velocity and direction data, as well as PM 10 concentrations in some key locations within the urban canyon. To accurately predict the concentration field, a relevant dispersion parameter, the turbulent

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Section: Available Local Mitigation Measuresmentioning

confidence: 99%

Application of Improved CFD Modeling for Prediction and Mitigation of Traffic-Related Air Pollution Hotspots in a Realistic Urban Street

Lauriks

Longo

Baetens

et al. 2021

Atmospheric Environment

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“…As a quartz fibre filter is commonly used for sampling PM 2.5 and withstands temperatures up to 1000 • C, it was used as the supporting material for the TiO 2 . Following the method of Misawa et al [22], a TiO 2 layer was formed on the surface of the individual quartz fibres by calcinating titanium tetraisopropoxide (TTIO). By considering the suction pressure of the air sampler and adjusting the TTIO concentration, the amount of TiO 2 supported on the filter was estimated as approximately 0.05 g/filter [22].…”

Section: Pm 25 Collection Using the Tio 2 Filtermentioning

confidence: 99%

“…Following the method of Misawa et al [22], a TiO 2 layer was formed on the surface of the individual quartz fibres by calcinating titanium tetraisopropoxide (TTIO). By considering the suction pressure of the air sampler and adjusting the TTIO concentration, the amount of TiO 2 supported on the filter was estimated as approximately 0.05 g/filter [22]. The actual amount was subsequently determined as the difference in mass before and after calcination, which was calculated to be 0.0478 ± 0.0051 g/filter (n = 3).…”

Section: Pm 25 Collection Using the Tio 2 Filtermentioning

confidence: 99%

“…The photocatalytic degradation rate is dependent on the UV intensity. Based on Misawa et al's [22] observations of significant decreases in the carbonaceous content of the PM 2.5 at a peak wavelength of 365 nm at 1.1 mW/cm 2 , we employed the same irradiation conditions in this study. Figure 3 shows the scanning electron microscope (SEM) images of individual PM 2.5 particles collected on the quartz and TiO 2 filters before and after UV-irradiation for 72 h. While no remarkable changes were observed for the PM 2.5 collected on the quartz filter (as a control), numerous particles disappeared from the TiO 2 filter, which we attributed to the photocatalytic degradation of organic compounds.…”

Section: Pm 25 Collection Using the Tio 2 Filtermentioning

confidence: 99%

“…We previously developed a TiO2-supporting quartz fibre filter (TiO2 filter) for the collection of PM2.5 and subsequently applied this to the degradation of the carbonaceous components in PM2.5 [22]. Our results showed that the total carbon content in PM2.5, measured by a carbon analyser, gradually decreased with time during ultraviolet (UV) irradiation, and carbon dioxide (CO2) was the major product [22]. However, the application of this kind of treatment remains untested for individual organic compounds such as PAHs.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM2.5) Collected on TiO2-Supporting Quartz Fibre Filters

et al. 2021

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Airborne fine particulate matter (PM2.5) 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 PM2.5, employing titanium dioxide (TiO2)-supporting quartz fibre filters. A TiO2 layer was formed on the quartz fibre filters, and airborne PM2.5 was collected using an air sample at a flow rate of 500 L/min for 24 h. The PM2.5 samples were subsequently irradiated with ultraviolet rays at 1.1 mW/cm2. 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-TiO2 coated) quartz fibre filters. However, the degradation rates were much faster when the PAHs were in direct contact with the TiO2 layer. As PM2.5 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 PM2.5 using water treatment.

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On coming back, the scaring COVID‐19 concern. Addressing indoor microclimates with innovative and straightforward solutions to prevent SARS‐CoV2 spreading

Chirumbolo,

Tirelli

2024

Journal of Medical Virology

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To the Editor, Some recent news in mainstream media about new SARS-CoV2 variants of concern 1 may be felt as a nagging warning if, as reported in some Editorials in leading, highly impacted scientific journals, someone is still afraid that "COVID is on the rise again." 2 COVID-19 concern, with its scaring perspective, is either coming back or has never faded off; probably the meaning is the same, yet people are compelled again to rescue their own awareness and scares to address any new forecast epidemic wave and any consequent averted social restriction. 2In the meantime, politicians did not arrange any good approach to allow people to live in a safe context, aside from vaccination. SARS-CoV2 is spread via airborne pollutants, even particulate matter PM 2.5 and PM 10 , so, at least in indoor spaces, where people work or study, solutions to reduce the presence of these particles may be particularly crucial. Particulate matters, that is, PM 2.5 and PM 10 , are terms used to refer to particles in the air that have a specific size range. PM 2.5 (Particulate Matter 2.5) refers to fine particulate matter with a diameter of 2.5 μm or smaller coming from combustion processes (e.g., vehicle exhaust and industrial emissions), dust, and chemical reactions in the atmosphere. PM 10 (Particulate Matter 10) refers to inhalable coarse particles with a diameter of 10 μm or smaller. These particles are larger than PM 2.5 , but they can still be inhaled into the respiratory system and can include road dust, airborne pollutants from construction activities, agricultural operations, and some industrial processes. Particulate matter in polluted air can spread SARS-CoV2, as these particles are considered as SARS-CoV2 carriers, 3,4 and their removal from indoor spaces is particularly challenging to reduce SARS-CoV2 spreading in human communities.In this warning stage for preventing new pandemics, besides the wise recommendation to undergo anti-COVID-19 vaccination if elderly or immune-compromised, people try to neglect any alarming news and rely on the huge mass of disinformation concerning COVID-19, to be simply reassured by optimistic, easy-to-do perspectives. 5 Actually, SARS-CoV2 underwent an endemic phase

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Photocatalytic degradation of atmospheric fine particulate matter (PM_2.5) collected on TiO₂ supporting quartz fibre filter

Cited by 23 publications

References 20 publications

Application of Improved CFD Modeling for Prediction and Mitigation of Traffic-Related Air Pollution Hotspots in a Realistic Urban Street

Application of Improved CFD Modeling for Prediction and Mitigation of Traffic-Related Air Pollution Hotspots in a Realistic Urban Street

Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM2.5) Collected on TiO2-Supporting Quartz Fibre Filters

On coming back, the scaring COVID‐19 concern. Addressing indoor microclimates with innovative and straightforward solutions to prevent SARS‐CoV2 spreading

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Photocatalytic degradation of atmospheric fine particulate matter (PM2.5) collected on TiO2 supporting quartz fibre filter

Cited by 23 publications

References 20 publications

Application of Improved CFD Modeling for Prediction and Mitigation of Traffic-Related Air Pollution Hotspots in a Realistic Urban Street

Application of Improved CFD Modeling for Prediction and Mitigation of Traffic-Related Air Pollution Hotspots in a Realistic Urban Street

Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matter (PM2.5) Collected on TiO2-Supporting Quartz Fibre Filters

On coming back, the scaring COVID‐19 concern. Addressing indoor microclimates with innovative and straightforward solutions to prevent SARS‐CoV2 spreading

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Product

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Photocatalytic degradation of atmospheric fine particulate matter (PM_2.5) collected on TiO₂ supporting quartz fibre filter