Photocatalytic Degradation of Gaseous Formaldehyde Using TiO2 Film

The photocatalytic degradation of gaseous formaldehydea major cause of sick building syndromewas studied using a TiO2 thin film. TiO2 thin films have many unique photoinduced properties, for example, self-cleaning, anti-fouling, and anti-bacterial functions. UV illumination of the TiO2 thin film p...

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Published in:Environmental science & technology 1998-12, Vol.32 (23), p.3831-3833
Main Authors: Noguchi, Tetsuro, Fujishima, Akira, Sawunyama, Phillip, Hashimoto, Kazuhito
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Bacteria
Chemical reactions
Chemicals
Exact sciences and technology
Gases
General processes of purification and dust removal
Pollution
Prevention and purification methods
Toxicology
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container_end_page 3833
container_issue 23
container_start_page 3831
container_title Environmental science & technology
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creator Noguchi, Tetsuro
Fujishima, Akira
Sawunyama, Phillip
Hashimoto, Kazuhito
description The photocatalytic degradation of gaseous formaldehydea major cause of sick building syndromewas studied using a TiO2 thin film. TiO2 thin films have many unique photoinduced properties, for example, self-cleaning, anti-fouling, and anti-bacterial functions. UV illumination of the TiO2 thin film placed in a gaseous formaldehyde/air environment resulted in the total mineralization of formaldehyde to CO2 and H2O. We invoked a Langmuir−Hinshelwood kinetic model to analyze the dependence of reaction rates on the concentration of formaldehyde. In addition, the overall decomposition rate constant for formaldehyde was comparable to that of acetaldehyde (a standard test reactant) for initial concentrations of up to 1000 ppmv. However, the apparent adsorption constant K app of formaldehyde onto TiO2 was ca. 2.5 times larger than that of acetaldehyde. Thus in the low concentration regime, the reactivity of formaldehyde appeared to be greater than that of acetaldehyde. In like manner, a dark adsorption experiment also showed the high adsorption capacity of TiO2 for formaldehyde. Therefore, we conclude that TiO2 serves as both a good adsorbent and a photocatalyst for the elimination of gaseous formaldehyde.
doi_str_mv 10.1021/es980299+
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Applied sciences
Atmospheric pollution
Bacteria
Chemical reactions
Chemicals
Exact sciences and technology
Gases
General processes of purification and dust removal
Pollution
Prevention and purification methods
Toxicology
title Photocatalytic Degradation of Gaseous Formaldehyde Using TiO2 Film
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