Indoor formaldehyde removal by catalytic oxidation, adsorption and nanofibrous membranes: a review

Indoor pollution of air by formaldehyde poses a serious threat to human health because formaldehyde causes illnesses and discomfort even at low levels, thus calling for abatement techniques. Techniques include absorption, physisorption, chemisorption, biological and botanical filtration, photocataly...

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Bibliographic Details
Published in:Environmental chemistry letters 2021-06, Vol.19 (3), p.2551-2579
Main Authors: Robert, Berly, Nallathambi, Gobi
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Air pollution
Analytical Chemistry
Biofiltration
Catalysts
Catalytic oxidation
Chemisorption
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Formaldehyde
Geochemistry
Indoor air pollution
Indoor air quality
Leaching
Membrane separation
Membranes
Metal oxides
Metals
Nanoparticles
Noble metals
Oxidation
Photocatalysis
Photooxidation
Pollutants
Pollution
Relative humidity
Removal
Review
Surface properties
Ultraviolet radiation
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Summary:Indoor pollution of air by formaldehyde poses a serious threat to human health because formaldehyde causes illnesses and discomfort even at low levels, thus calling for abatement techniques. Techniques include absorption, physisorption, chemisorption, biological and botanical filtration, photocatalytic decomposition, membrane separation, plasma and catalytic oxidation. Here we review the principles, performances, advantages and disadvantages of these techniques, with focus on catalytic oxidation, adsorption and the use of nanofibrous membranes. Supported noble metal and metal oxide-based materials are efficient catalysts for oxidation. We present photocatalytic oxidation under UV, visible and solar light using composites. Chemisorption method is reviewed with focus on amino-containing adsorbents, conditions of temperature and relative humidity and surface properties. Nanofibrous membranes display high density of active sites for pollutant interactions and allow formaldehyde removal without leaching out of catalyst nanoparticles or adsorbents.
ISSN:1610-3653
1610-3661
DOI:10.1007/s10311-020-01168-6