Effect of humidity on the photocatalytic degradation of trichloroethylene in gas Phase over TiO2 thin films treated by different conditions

Kim, Jong Soon; Lee, Tai Kyu

doi:10.1007/bf02705622

Cited by 12 publications

(2 citation statements)

References 27 publications

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“…This range agrees with the reported experimental data of 25, 45 and 90 mmol represented with the green, blue, and yellow color cross marks. Thus, these results are in line with claims from others [62][63][64] showing that keeping air relative humidity in the 20-50% range results in a lack of influence of humidity on photocatalytic activity. Therefore, under the proposed conditions, one can process a VOC air contaminated stream with a 30-50% RH.…”

Section: Conflicts Of Interestsupporting

confidence: 92%

Photocatalytic Conversion of Organic Pollutants in Air: Quantum Yields Using a Silver/Nitrogen/TiO2 Mesoporous Semiconductor under Visible Light

et al. 2021

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This research studies the photocatalytic conversion of methanol (25–90 µmol/L range) as a volatile organic compound (VOC) surrogate into CO2, using a N/Ag/TiO2 photocatalyst under visible light irradiation in a Photo-CREC Air unit. The N/Ag/TiO2 mesh supported photocatalyst is prepared via the solvothermal method. While the bare-TiO2 is inactive under visible light, the N/Ag/TiO2 2 wt.% loaded stainless-steel woven mesh displays 35% quantum yields, with 80% absorbed photons and 60% methanol conversion in a 110 min irradiation period. Results obtained are assigned to silver surface plasmon resonance, silver and nitrogen species synergistic impacts on band gap, and their influence on particle agglomerate size and semiconductor acidity. The determined quantum yields under visible light in a Photo-CREC Air unit, are the highest reported in the technical literature, that these authors are aware of, with this opening unique opportunity for the use of visible light for the purification of air from VOC contaminants.

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Section: Conflicts Of Interestsupporting

confidence: 92%

Photocatalytic Conversion of Organic Pollutants in Air: Quantum Yields Using a Silver/Nitrogen/TiO2 Mesoporous Semiconductor under Visible Light

et al. 2021

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“…No matter how the photocatalyst was treated, they discovered that when the RH was over 50%, the reaction rates dropped. [63] Similar result were also reported by Kazemi et al [64] A significant change in degradation efficiency was not observed as the RH increased from 10% to 15%, but when RH increased up to 30%, degradation efficiency increased to approximately 99%. Further increasing of RH reduced the degradation efficiency due to competitive adsorption of perchloroethylene (PCE) and water molecules on the photocatalytic surface.…”

Section: Chlorinated Vocssupporting

confidence: 86%

A review of prospects and challenges of photocatalytic decomposition of volatile organic compounds (VOCs) under humid environment

Masresha,

Jabasingh,

Kebede

et al. 2023

Can J Chem Eng

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Volatile organic compounds (VOCs) are harmful for humans and the surrounding ecosystem. Emissions from these pollutants have caused a significant reduction in air quality, which has an effect on people's health. Alkanes, alkenes, alcohols, aromatics, and other VOC pollutants have all been broken down by TiO2 photocatalytic processes. Due to several operating inefficiencies and deactivation issues in humid environments, the practical application of photocatalysis has not been realized on a broader scale. The effectiveness of photo‐oxidation of VOCs is impacted by a variety of environmental conditions. In the photocatalytic oxidation of the VOCs, relative humidity (RH) is critical. Therefore, it is important to review the recent findings on how humidity affects the photocatalytic breakdown of VOCs in air. To satisfy this need, this work provides a critical review of the related literature with focus on the fundamentals of photocatalysis, photocatalytic degradation of air pollutants, and the influence of humidity on the photocatalytic process degradation for selected air pollutants. It also highlights the kinetic models and typical photocatalytic reactor and supports for VOC removal.

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humidity

Cornils¹

2020

Catalysis From a to Z

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Effect of humidity on the photocatalytic degradation of trichloroethylene in gas Phase over TiO2 thin films treated by different conditions

Cited by 12 publications

References 27 publications

Photocatalytic Conversion of Organic Pollutants in Air: Quantum Yields Using a Silver/Nitrogen/TiO2 Mesoporous Semiconductor under Visible Light

Photocatalytic Conversion of Organic Pollutants in Air: Quantum Yields Using a Silver/Nitrogen/TiO2 Mesoporous Semiconductor under Visible Light

A review of prospects and challenges of photocatalytic decomposition of volatile organic compounds (VOCs) under humid environment

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