Different methods in TiO2 photodegradation mechanism studies: Gaseous and TiO2-adsorbed phases

Deveau, Pierre-Alexandre; Arsac, Fabrice; Thivel, Pierre-Xavier; Ferronato, Corinne; Delpech, François; Chovelon, Jean‐Marc; Kaluzny, Pascal; Monnet, Christine

doi:10.1016/j.jhazmat.2007.01.097

Cited by 41 publications

(21 citation statements)

References 8 publications

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“…In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) is one of the most powerful technologies for identifying and characterizing the adsorption species and intermediates on catalysts' surface under realistic conditions [21][22][23][24][25][26][27][28][29][30]. Reaction mechanisms of photocatalytic degradation of VOCs have been intensively studied by FTIR method [24,27].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Oxidation of Gaseous Formaldehyde on TiO2: An In Situ DRIFTS Study

et al. 2010

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The adsorption and photocatalytic oxidation of formaldehyde on the pure TiO 2 under dry and humid conditions were studied by in situ diffuse reflectance Fourier transform infrared spectroscopy. It was found that the formaldehyde molecules can be adsorbed on the hydroxyl groups on the TiO 2 surface via hydrogen bonding. With UV irradiation, the adsorbed formaldehyde rapidly converts to the formate species even on the pure TiO 2 at room temperature and atmospheric pressure. In the dry environment, the superoxide radical anion O 2 -•, formed by adsorbed oxygen reacting with electrons, is suggested to play an important role in the formaldehyde oxidation. The introduction of water vapor provides a large amount of water and hydroxyl groups on the catalyst surface. Oxidation of water and hydroxyl groups by the photogenerated holes produces very active OH• radicals, which take part in the redox reactions and improve significantly the mineralization rate of formaldehyde on the TiO 2 due to its high redox potential.

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Section: Introductionmentioning

confidence: 99%

“…Reaction mechanisms of photocatalytic degradation of VOCs have been intensively studied by FTIR method [24,27]. However, to the best of our knowledge, almost no research has been done to investigate the photocatalytic oxidation of formaldehyde on pure TiO 2 using in situ DRIFTS.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of Gaseous Formaldehyde on TiO2: An In Situ DRIFTS Study

et al. 2010

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“…While the holes react with water to produce hydroxyl radicals, the electrons react with molecular oxygen molecules producing superoxide radical anions. These two reactive species react with the organic contaminants and decompose them [14][15][16][17]. The photocatalytic activity of TiO2 is widely studied in literature.…”

Section: Photocatalytic Degradationmentioning

confidence: 99%

Coaxial nanofibers containing TiO₂ in the shell for water treatment applications

Kızıldağ

Geltmeyer

Uçar

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In recent years, the basic electrospinning setup has undergone many modifications carried out to enhance the quality and improve the functionality of the resulting nanofibers. Being one of these modifications, coaxial electrospinning has attracted great attention. It enables to use different materials in nanofiber production and produce multi-layered and functional nanofibers in one step. In this study, TiO2 has been added to the shell layer of coaxial nanofibers to develop functional nanofibers which may be used in water treatment applications. The coaxial nanofibers containing TiO2 in the shell layer are compared to uniaxial nanofibers containing TiO2 in bulk fiber structure, regarding their morphology and photocatalytic activity. Uniform uniaxial and coaxial nanofibers with TiO2 were obtained. The average nanofiber diameter of coaxial nanofibers were higher. Coaxial nanofibers, which contained lower amount of TiO2, displayed similar performance to uniaxial nanofibers with TiO2 in terms of photocatalytic degradation ability against isoproturon.

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“…Here, it should be noted that the reaction rate was much lower than that in Figure 1, because the catalyst weight was much lower (see Experimental Section). In the toluene photooxidation ([toluene] 0 = 30 ppm), the bands appeared in the wavenumber range 1000-2000 cm were assignable to benzaldehyde [30][31][32][33][34]. The strong band at 1414 cm were assignable to adsorbed benzoic acid on TiO 2 [30][31][32][33][34].…”

Section: In Situ Ftir Studies For Toluene Photooxidationmentioning

confidence: 99%

Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts

2013

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Gas-solid heterogeneous photooxidation of toluene over TiO 2 catalyst was studied to investigate the factors controlling the catalytic activities. The toluene photooxidation behavior on TiO 2 was strongly affected by the formation and oxidation behavior of intermediate compounds on TiO 2 , and their accumulation decreased the reaction rate for toluene photooxidation. The formation and oxidation behavior of the byproduct compounds depended on the initial concentration of toluene and water vapor. In situ Fourier transform infrared (FTIR) studies revealed that water vapor promoted the cleavage of the aromatic ring and facilitated CO 2 formation. At the reaction temperature of 300 K, the deposition of Pt on TiO 2 suppressed CO formation, whereas catalytic activity was decreased due to the increase in the amount of intermediate compounds. On the other hand, Pt/TiO 2 showed higher activity than TiO 2 at 353 K, in spite of the increase of the intermediate compounds.

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Different methods in TiO2 photodegradation mechanism studies: Gaseous and TiO2-adsorbed phases

Cited by 41 publications

References 8 publications

Photocatalytic Oxidation of Gaseous Formaldehyde on TiO2: An In Situ DRIFTS Study

Photocatalytic Oxidation of Gaseous Formaldehyde on TiO2: An In Situ DRIFTS Study

Coaxial nanofibers containing TiO₂ in the shell for water treatment applications

Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts

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Different methods in TiO2 photodegradation mechanism studies: Gaseous and TiO2-adsorbed phases

Cited by 41 publications

References 8 publications

Photocatalytic Oxidation of Gaseous Formaldehyde on TiO2: An In Situ DRIFTS Study

Photocatalytic Oxidation of Gaseous Formaldehyde on TiO2: An In Situ DRIFTS Study

Coaxial nanofibers containing TiO2 in the shell for water treatment applications

Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts

Contact Info

Product

Resources

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Coaxial nanofibers containing TiO₂ in the shell for water treatment applications