Evaluation of a Combined Ultraviolet Photocatalytic Oxidation(UVPCO)/Chemisorbent Air Cleaner for Indoor Air Applications

Photocatalysis is an effective method of air purification at the condition of a higher pollutant concentration. However, its wide application in indoor air cleaning is limited due to the low level of indoor air contaminants. Immobilizing the nanosized TiO2particles on the surface of activated carbon filter (TiO2/AC film) could increase the photocatalytic reaction rate as a local high pollutant concentration can be formed on the surface of TiO2by the adsorption of AC. However, the pollutant removal still decreased quickly with the increase in flow velocity, which results in a decrease in air treatment capacity. In order to improve the air treatment capacity by the photocatalytic oxidation (PCO) method, this paper used formaldehyde (HCHO) as a contaminant to study the effect of combination of PCO with nonthermal plasma technology (NTP) on the removal of HCHO. The experimental results show that HCHO removal is more effective with line-to-plate electrode discharge reactor; the HCHO removal and the reaction rate can be enhanced and the amount of air that needs to be cleaned can be improved. Meanwhile, the results show that there is the synergistic effect on the indoor air purification by the combination of PCO with NTP.

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From semiconductors to semimetals: bismuth as a photocatalyst for NO oxidation in air

Journal of Materials Chemistry A ◽

10.1039/c4ta01339e ◽

2014 ◽

Vol 2 (29) ◽

pp. 11065-11072 ◽

Cited By ~ 66

Author(s):

Qian Zhang ◽

Ying Zhou ◽

Fang Wang ◽

Fan Dong ◽

Wei Li ◽

...

Keyword(s):

Indoor Air ◽

Photocatalytic Oxidation ◽

No Oxidation ◽

Oxidation In Air ◽

Oxidation Of No

Black semimetallic Bi films were found to be active in the photocatalytic oxidation of NO at the indoor air level.

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Effect of titanium dioxide properties and support material on photocatalytic oxidation of indoor air pollutants

Building and Environment ◽

10.1016/j.buildenv.2020.107518 ◽

2021 ◽

Vol 189 ◽

pp. 107518

Author(s):

Alireza Haghighat Mamaghani ◽

Fariborz Haghighat ◽

Chang-Seo Lee

Keyword(s):

Titanium Dioxide ◽

Indoor Air ◽

Air Pollutants ◽

Photocatalytic Oxidation ◽

Support Material ◽

Indoor Air Pollutants

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Electrostatic Precipitators as an Indoor Air Cleaner—A Literature Review

Sustainability ◽

10.3390/su12218774 ◽

2020 ◽

Vol 12 (21) ◽

pp. 8774

Author(s):

Alireza Afshari ◽

Lars Ekberg ◽

Luboš Forejt ◽

Jinhan Mo ◽

Siamak Rahimi ◽

...

Keyword(s):

Indoor Air ◽

Indoor Environment ◽

Indoor Environmental Quality ◽

Air Filtration ◽

Pressure Drops ◽

Air Cleaning ◽

Air Cleaner ◽

Air Cleaners ◽

Electrostatic Precipitators ◽

Cleaning Technology

Many people spend most of their time in an indoor environment. A positive relationship exists between indoor environmental quality and the health, wellbeing, and productivity of occupants in buildings. The indoor environment is affected by pollutants, such as gases and particles. Pollutants can be removed from the indoor environment in various ways. Air-cleaning devices are commonly marketed as benefiting the removal of air pollutants and, consequently, improving indoor air quality. Depending on the type of cleaning technology, air cleaners may generate undesired and toxic byproducts. Different air filtration technologies, such as electrostatic precipitators (ESPs) have been introduced to the market. The ESP has been used in buildings because it can remove particles while only causing low pressure drops. Moreover, ESPs can be either in-duct or standalone units. This review aims to provide an overview of ESP use, methods for testing this product, the performance of existing ESPs concerning removing pollutants and their byproducts, and the existing market for ESPs.

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Photocatalytic oxidation of methyl ethyl ketone over sol-gel and commercial TiO2 for the improvement of indoor air

Water Science & Technology ◽

10.2166/wst.2006.343 ◽

2006 ◽

Vol 53 (11) ◽

pp. 107-115 ◽

Cited By ~ 18

Author(s):

C. Raillard ◽

V. Héquet ◽

P. Le Cloirec ◽

J. Legrand

Keyword(s):

Methyl Ethyl Ketone ◽

Indoor Air ◽

Photocatalytic Oxidation ◽

Degradation Kinetics ◽

Sol Gel ◽

Degradation Pathway ◽

Air Pollutant ◽

Methyl Ethyl ◽

Fixed Temperature ◽

Glass Plates

This work focuses on the photocatalytic oxidation of gaseous methyl ethyl ketone chosen as a typical indoor air pollutant. Two types of TiO2 coatings were prepared and deposited on glass plates: one using the commercial Degussa P25 TiO2 and the other one by sol-gel method. The first objective of this study was to compare different ways of preparing thin films of sol-gel TiO2 coated on glass plates, taking into account their general aspect and their photocatalytic efficiency. Several parameters were tested, such as the stabilising agent, the glass type of the support, the number of coatings and the calcination temperature. One of the synthesised materials was then kept to carry out the following study. The study aimed to assess the influence of TiO2 coating types on the effect of water vapour. This was achieved by performing MEK photocatalytic degradation kinetics under two levels of humidity at a fixed temperature. Experimental results were then modelled by the Langmuir-Hinshelwood equation. The obtained parameters gave specific trends in function of the considered catalyst. The second part of this work was to identify MEK degradation byproducts during its photocatalytic oxidation. The main detected intermediate was acetaldehyde, followed by methyl formate. A MEK degradation pathway was then proposed.

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