Abstract
Purification of air from the organic contaminants by the photocatalytic process has been confirmed to be very perspective. Although many various photocatalysts have been prepared and studied so far, TiO2 is still the most commonly used, because of its advantageous properties such as non-toxicity, relatively low cost and high stability. Surface modifications of TiO2 were extensively proceeded in order to increase photocatalytic activity of the photocatalyst under both UV and visible light activations. The intention of this review paper was to summarize the scientific achievements devoted to developing of TiO2-based materials considered as photocatalysts for the photocatalytic degradation of acetaldehyde in air. Influence of the preparation and modification methods on the parameters of the resultant photocatalyst is reviewed and discussed in this work. Affinity of the photocatalyst surfaces towards adsorption of acetaldehyde will be described by taking into account its physicochemical parameters. Impact of the contact time of a pollutant with the photocatalyst surface is analyzed and discussed with respect to both the degradation rate and mineralization degree of the contaminant. Influence of the photocatalyst properties on the mechanism and yield of the photocatalytic reactions is discussed. New data related to the acetaldehyde decomposition on commercial TiO2 were added, which indicated the different mechanisms occurring on the anatase and rutile structures. Finally, possible applications of the materials revealing photocatalytic activity are presented with a special attention paid to the photocatalytic purification of air from Volatile Organic Compounds (VOCs).
Highlights
The assurance of good-quality conditions in the indoor air has started to be a subject of many discussions and a wide area of the research studies
We have with anatase anatase surface surface underwent underwent faster faster We have proven proven that that chemically chemically bonded bonded acetaldehyde acetaldehyde with through photocatalytic conversion, compared to that which was weakly bonded by
The band at 1633−1635 cm−1 assigned to C=C vibrations in crotonaldehyde was the most intensive in titania Kronos and P90 samples, it could be connected with high adsorption of acetaldehyde on these samples and occurring aldol condensation on anatase structure
Summary
The assurance of good-quality conditions in the indoor air has started to be a subject of many discussions and a wide area of the research studies. Application of TiO2 for decomposition of low-concentration VOCs was firstly proposed by the group of Fujishima [10] Formaldehyde they demonstrated that the classifie as identified hydrocarbon as a substance is suspected of causing was maximum quantum yield (QY) for decomposition of 2-propanol on TiO2 —28%, was achieved for the s a cancerogenic substance and its concentration in wooden products is regulated under the TSC lowest light intensity and for the highest concentration of 2-propanol (1000 ppmv) [10] The explanation of these results was thatprogram adsorbed organic molecules to inhibit recombination. There is an outline of the path of acetaldehyde conversion by TiO2 under weak UV illumination
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