TOF-SIMS study of photocatalytic decomposition reactions on nanocrystalline TiO2 films

Gnaser, Hubert; Orendorz, Adam; Ziegler, Christiane; Rowlett, Elisabeth; Böck, Wolfgang

doi:10.1016/j.apsusc.2006.02.216

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…These support the previous XPS analysis 34 that showed a decrease of the carbon to oxygen ratio associated to organic contaminants. Our ToF-SIMS findings agree well with those of a previous study by Gnaser, 47 which describes the catalytic activity of TiO 2 in the decomposition of surface contaminants upon exposure to UV light. The deposited TiO 2 nanoparticles are in anatase crystalline form and photocatalytically active.…”

Section: Resultssupporting

confidence: 91%

ToF-SIMS Analysis of UV-Switchable TiO₂-Nanoparticle-Coated Paper Surface

et al. 2013

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The chemical composition of a TiO2 nanoparticle coated paper surface was analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS) to study the interconnection between wettability and surface chemistry on the nanoscale. In this work, a superhydrophobic TiO2 surface rich in carboxyl-terminated molecules was created by a liquid flame spray process. The TiO2 nanoparticle coated paper surface can be converted by photocatalytic oxidation into a highly hydrophilic one. Interestingly, the hydrophilic surface can be converted back into a superhydrophobic surface by heat treatment. The results showed that both ultraviolet A (UVA) and oven treatment induce changes in the surface chemistry within a few nanometers of the paper surface. These findings are consistent with those from our previously reported X-ray photoelectron spectroscopy (XPS) analysis, but the ToF-SIMS analysis yields more accurate insight into the surface chemistry.

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Section: Resultssupporting

confidence: 91%

ToF-SIMS Analysis of UV-Switchable TiO₂-Nanoparticle-Coated Paper Surface

et al. 2013

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“…This protocol is based on the evaluation of the photodegradation of MB dye, the degradation mechanism of which is still under investigation. It is well accepted that regardless of photocatalysts, different activating radiation sources (or radical primers) during the early stages of the degradation MB-related molecules such as Azure A, Azure B and Azure C (identical MB structure, save the pendant methyl groups) and several hydroxylated and oxidised products are observed [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. On the other hand, with the progress of the process, the identification of the intermediates becomes more difficult because of the low amount of the different species, and the degradation mechanism becomes more speculative, trying to suppose the way for the rings opening and the complete mineralization.…”

Section: Resultsmentioning

confidence: 99%

Large-Scale MOCVD Deposition of Nanostructured TiO2 on Stainless Steel Woven: A Systematic Investigation of Photoactivity as a Function of Film Thickness

2022

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Heterogeneous photocatalysis is considered as one of the most appealing options for the treatment of organic pollutants in water. However, its definitive translation into industrial practice is still very limited because of both the complexity of large-scale production of catalysts and the problems involved in handling the powder-based photocatalysts in the industrial plants. Here, we demonstrate that the MOCVD approach can be successfully used to prepare large-scale supported catalysts with a good photocatalytic activity towards dye degradation. The photocatalyst consisted of nanostructured TiO2 thin film deposited on a stainless steel mesh substrate. The film thickness, the morphological features, and the crystallographic properties of the different portions of the sample were correlated to the position in the reactor chamber and the reaction conditions. The photocatalytic activity was evaluated according to the international standard test ISO 10678:2010 based on methylene blue degradation. The photocatalytic activity is essentially constant (PMB over 40 µmol·m−2·h−1) throughout the film, except for the portion of sample placed at the very end of the reactor chamber, where the TiO2 film is too thin to react properly. It was assessed that a minimum film thickness of 250–300 nm is necessary to reach the maximum photocatalytic performance.

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“…However, in many applications ncTiO 2 is used in the form of films supported on substrates [9]. Hence, the direct probing of photocatalytic processes occurring on nc-TiO 2 films is desirable, but has rarely been done [8,10]. The goal of this work was to use time-of-flight secondary ion mass spectrometry (ToF-SIMS) to monitor photocatalytic reactions on nc-TiO 2 films via mass spectrometry of desorbed surface species.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic decomposition of methylene blue and 4-chlorophenol on nanocrystalline TiO2 films under UV illumination: A ToF-SIMS study

Orendorz

Ziegler

Gnaser

2008

Applied Surface Science

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TOF-SIMS study of photocatalytic decomposition reactions on nanocrystalline TiO2 films

Cited by 11 publications

References 23 publications

ToF-SIMS Analysis of UV-Switchable TiO₂-Nanoparticle-Coated Paper Surface

ToF-SIMS Analysis of UV-Switchable TiO₂-Nanoparticle-Coated Paper Surface

Large-Scale MOCVD Deposition of Nanostructured TiO2 on Stainless Steel Woven: A Systematic Investigation of Photoactivity as a Function of Film Thickness

Photocatalytic decomposition of methylene blue and 4-chlorophenol on nanocrystalline TiO2 films under UV illumination: A ToF-SIMS study

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TOF-SIMS study of photocatalytic decomposition reactions on nanocrystalline TiO2 films

Cited by 11 publications

References 23 publications

ToF-SIMS Analysis of UV-Switchable TiO2-Nanoparticle-Coated Paper Surface

ToF-SIMS Analysis of UV-Switchable TiO2-Nanoparticle-Coated Paper Surface

Large-Scale MOCVD Deposition of Nanostructured TiO2 on Stainless Steel Woven: A Systematic Investigation of Photoactivity as a Function of Film Thickness

Photocatalytic decomposition of methylene blue and 4-chlorophenol on nanocrystalline TiO2 films under UV illumination: A ToF-SIMS study

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ToF-SIMS Analysis of UV-Switchable TiO₂-Nanoparticle-Coated Paper Surface

ToF-SIMS Analysis of UV-Switchable TiO₂-Nanoparticle-Coated Paper Surface