Controlling Nitrogen Oxide and Ultraviolet-A irradiance in ventilation duct system using TiO2 photocatalyst

Song, Yong Woo; Kim, Seong Eun; Jung, Yong Gi; Yoo, Jae Yun; Park, Jin Chul

doi:10.1016/j.buildenv.2021.107881

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…Accordingly, a Philips TL-D 18 W BL lamp with a maximum light intensity of 20 W/m 2 was used in this study. By applying irradiance, the oxidation reaction of the TiO 2 photocatalyst is promoted according to the increase in UV-A irradiance, confirmed by Song et al [49], resulting in an improvement in the overall pollutant reduction rate.…”

Section: Mock-up Experimentmentioning

confidence: 66%

“…The pollutant reduction performance of each filter were compared at varying air volumes and ventilation frequencies to evaluate their effectiveness in removing commonly found gaseous pollutants in apartment buildings. Specifically, a TiO 2 photocatalyst coating agent was applied to the TiO 2 photocatalytic filter designed and developed by Song et al [49] to remove NO x using ducts. Toluene was used a representative indoor gas pollutant in the experiment as suggested by the WHO [50], ASHRAE [51], and Ministry of Environment of the Republic of Korea [52].…”

Section: Introductionmentioning

confidence: 99%

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Indoor Pollutant Reduction Performance of Different Mechanical Ventilation Filters in Apartment Buildings

Kim,

Park,

Song

2023

Indoor Air

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High-efficiency particulate air (HEPA) and charcoal filters have been applied to ventilation systems to save energy and reduce pollutants. However, such filters only work for specific types of pollutants, and their performance is not always sustainable. This study compares the pollutant reduction performance of TiO2 photocatalytic filters with HEPA and charcoal filters in mock-up experiments with toluene as the pollutant, changing air volume, and varying ventilation frequencies. The results show that the HEPA filter was ineffective at reducing toluene, and the charcoal filter was found to have the fastest reduction rate until 180 min after the start of the experiment. However, after 180 min when the charcoal filter was saturated, its pollutant reduction performance rapidly declined, resulting in low persistence. Conversely, the TiO2 photocatalytic filter had a lower reduction rate than that of the charcoal filter but had a continuous pollutant reduction performance during 720 min. Comparing the pollutant reduction effect of the TiO2 photocatalyst filter and the charcoal filter with a reduced amount based on the experimental time, the TiO2 photocatalyst filter has a maximum pollutant reduction effect of about seven times and at least about two times. This study confirms that HEPA and charcoal filters reduce gas pollutants, and it was found that combining TiO2 photocatalysts with ventilation devices can improve indoor air quality in apartment buildings.

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Section: Mock-up Experimentmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Indoor Pollutant Reduction Performance of Different Mechanical Ventilation Filters in Apartment Buildings

Kim,

Park,

Song

2023

Indoor Air

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“…First, when a photocatalyst is applied inside the device and an artificial light source is added, the efficiency of the photocatalyst may vary depending on the intensity of the light source. Song et al [45] demonstrated that applying UV rays in confined spaces such as ventilation ducts, as well as preventing the rays from leaking indoors (to avoid UV damage to all life forms), can safely remove indoor air particulate matter. However, only a few studies have investigated changes in UV-A irradiance according to the lifespan of artificial light sources.…”

Section: Introductionmentioning

confidence: 99%

Indoor Air Pollutant (Toluene) Reduction Based on Ultraviolet-A Irradiance and Changes in the Reactor Volume in a TiO2 Photocatalyst Reactor

Song,

Kim,

Yoo

et al. 2023

Materials

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This study experimentally confirmed the effect of TiO2 photocatalysts on the removal of indoor air pollutants. In the experiment, toluene, a representative indoor air pollutant, was removed using a coating agent containing TiO2 photocatalysts. Conditions proposed by the International Organization for Standardization (ISO) were applied mutatis mutandis, and a photoreactor for an experiment was manufactured. The experiment was divided into two categories. The first experiment was conducted under ISO conditions using the TiO2 photocatalyst coating agent. In the second experiment, the amount of ultraviolet-A (UV-A) light was varied depending on the lamp’s service life, and the volume of the reactor was varied depending on the number of contaminants. The results showed that the TiO2 photocatalytic coating agent reduced the effect of toluene. This reduction effect can be increased as a primary function depending on the changes in the amount of UV-A light and reactor volume. However, because toluene is decomposed in this study, additional organic pollutants such as benzene and butadiene can be produced. Because these pollutants are decomposed by the TiO2 photocatalysts, the overall reduction performance may change. Nonetheless, TiO2 photocatalysts can be used to examine the effect of indoor pollutant reduction in indoor ventilation systems and building materials.

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Evaluation of NOx removal performance of foam composites with titanium dioxide and active carbon

Park

Choi²

2022

Construction and Building Materials

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Controlling Nitrogen Oxide and Ultraviolet-A irradiance in ventilation duct system using TiO2 photocatalyst

Cited by 4 publications

References 14 publications

Indoor Pollutant Reduction Performance of Different Mechanical Ventilation Filters in Apartment Buildings

Indoor Pollutant Reduction Performance of Different Mechanical Ventilation Filters in Apartment Buildings

Indoor Air Pollutant (Toluene) Reduction Based on Ultraviolet-A Irradiance and Changes in the Reactor Volume in a TiO2 Photocatalyst Reactor

Evaluation of NOx removal performance of foam composites with titanium dioxide and active carbon

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