Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts

Einaga, Hisahiro; Mochiduki, Keisuke; Teraoka, Yasutake

doi:10.3390/catal3010219

Cited by 44 publications

(16 citation statements)

References 37 publications

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“…(Debono et al 2011a;Einaga et al 2013;Farhanian and Haghighat 2014;Gunschera et al 2009;Sleiman et al 2009;Zhang et al 2011). The occurrence of the compounds could either be explained by pollutant or matrix degradation.…”

Section: By-productsmentioning

confidence: 98%

Portable photocatalytic air cleaners: efficiencies and by-product generation

Gunschera

Markewitz

Bansen

et al. 2015

Environ Sci Pollut Res

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Portable photocatalytic air cleaners were investigated in 24 and 48 m(3) emission test chambers with regard to efficiency and by-product generation. For this purpose, formaldehyde, decane, 1,2-dichlorobenzene, toluene, α-pinene and heptanal were doped at sub-ppm concentration levels into the chambers individually and in mixtures. By way of specified test protocols, efficiencies could be distinguished but were strongly dependant on the choice of test compounds, especially on whether single or multi compound dosing was used, and on long-term effects. Initial clean air delivery rates (CADRs) up to 137 m(3)/h were measured. Typical by-products were found in significant concentrations. The main ones were formaldehyde up to 50 ppb (62 μg/m(3)) and acetone up to 80 ppb (190 μg/m(3)). Other aldehydes were also found, but at smaller levels. The detection of chloroacetone, a strong irritating compound, at concentrations up to 15 ppb (57 μg/m(3)) strengthens the importance of such investigations especially in cases were chloro-organic compounds are involved.

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Section: By-productsmentioning

confidence: 98%

Portable photocatalytic air cleaners: efficiencies and by-product generation

Gunschera

Markewitz

Bansen

et al. 2015

Environ Sci Pollut Res

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“…However, if PCO are conducted at room temperature, the active sites on the photocatalyst’s surface could be gradually occupied by irreversibly chemisorbed intermediates, which retard the reactions. For example, during the photocatalytic oxidation processes for toluene over TiO 2 catalysts, it was found that the toluene photooxidation behavior was strongly affected by the formation and oxidation behavior of intermediate compounds [90]. The study carried out by Nakajima et al , showed that H 2 SO 4 treatment of TiO 2 surface provides higher photocatalytic removal efficiency on toluene which can be ascribed to the fast decomposition of intermediates by surface strong acid itself [91].…”

Section: Removal Of Indoor Vocs and Formaldehyde Via Photocatalytimentioning

confidence: 99%

Removal of Indoor Volatile Organic Compounds via Photocatalytic Oxidation: A Short Review and Prospect

et al. 2016

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Volatile organic compounds (VOCs) are ubiquitous in indoor environments. Inhalation of VOCs can cause irritation, difficulty breathing, and nausea, and damage the central nervous system as well as other organs. Formaldehyde is a particularly important VOC as it is even a carcinogen. Removal of VOCs is thus critical to control indoor air quality (IAQ). Photocatalytic oxidation has demonstrated feasibility to remove toxic VOCs and formaldehyde from indoor environments. The technique is highly-chemical stable, inexpensive, non-toxic, and capable of removing a wide variety of organics under light irradiation. In this paper, we review and summarize the traditional air cleaning methods and current photocatalytic oxidation approaches in both of VOCs and formaldehyde degradation in indoor environments. Influencing factors such as temperature, relative humidity, deactivation and reactivations of the photocatalyst are discussed. Aspects of the application of the photocatalytic technique to improve the IAQ are suggested.

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“…AOPs are based on in situ generation of reactive radical species, mainly OH ‚ , by means of solar, chemical or other forms of energy [12,13]. In this field the photocatalytic oxidation (PCO) in the presence of TiO 2 to give total or partial oxidation of liquid or gaseous contaminants to benign substances is one of the most promising environmentally friendly techniques for the abatement of volatile organic compounds (VOCs) [14,15]. In fact, the formation of electron-hole pairs on TiO 2 by light irradiation with a suitable light source plays a key role in the mineralization of VOCs into CO 2 and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Au/TiO2-CeO2 Catalysts for Photocatalytic Water Splitting and VOCs Oxidation Reactions

et al. 2016

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Photocatalytic water splitting for H 2 production and photocatalytic oxidation of 2-propanol, an example of volatile organic compounds, were investigated over TiO 2 catalysts loaded with gold and/or ceria. In the water splitting reaction the presence of gold only slightly affected the performance of TiO 2 whereas the presence of CeO 2 had a more remarkable positive effect. In the 2-propanol oxidation Au/TiO 2 was the most active sample in terms of alcohol conversion whereas Au/TiO 2 -CeO 2 exhibited the highest CO 2 yield. On the basis of characterization experiments (X-Ray Diffraction (XRD), Energy Dispersive X-ray Analysis EDX, surface area measurements, Diffuse Reflectance Spectroscopy (DRS) and Raman spectroscopy), it was suggested that the interaction of Au with TiO 2 causes an increase in the charge separation between the photo-excited electron/hole pairs, leading to an enhanced photocatalytic activity (to acetone over Au/TiO 2 and to CO 2 over Au/TiO 2 -CeO 2 ), whereas the presence of ceria, acting as a hole trap, positively mainly affects the formation of hydrogen by water splitting.

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Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts

Cited by 44 publications

References 37 publications

Portable photocatalytic air cleaners: efficiencies and by-product generation

Portable photocatalytic air cleaners: efficiencies and by-product generation

Removal of Indoor Volatile Organic Compounds via Photocatalytic Oxidation: A Short Review and Prospect

Au/TiO2-CeO2 Catalysts for Photocatalytic Water Splitting and VOCs Oxidation Reactions

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