Microstructure and environmental functionalities of TiO2-supported photocatalysts obtained by suspension plasma spraying

Toma, Filofteia-Laura; Bertrand, Ghislaine; Begin, Sylvie; Meunier, C.; Barrès, Odile; Klein, D.; CODDET, C

doi:10.1016/j.apcatb.2006.07.009

Cited by 87 publications

(50 citation statements)

References 35 publications

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“…10 shows the oxygen O1s XPS spectra www.intechopen.com (Hussain et al, 2011b). The O1s spectrum displayed peaks at 529.6 eV associated with Ti-O bonds in TiO 2 , at 530.8 eV, which correspond to the hydroxyl Ti-OH, (Hou et al, 2008;Kumar et al, 2000), whereas, at 532 eV, it shows Ti-OH 2 (Toma et al, 2006), which can be observed in the XPS spectra in Fig. 10 (A, Degussa P 25; B, TNPs).…”

Section: Xps Analysis Of the Optimized Tnp Vs Degussa P 25 Titaniamentioning

confidence: 89%

“…Hence, additional disposal or handling steps are needed. New, safe and clean chemical technologies and processes for VOC and ethylene (generated by fruit) abatement are currently being developed (Hussain et al, 2010, 2011a, 2011b, Toma et al, 2006. Conventionally, VOC pollutants are removed by air purifiers that employ filters to remove particulate matter or use sorption materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

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X-Ray Spectroscopy Tools for the Characterization of Nanoparticles

Hussain¹,

Saracco²,

Russo³

2012

X-Ray Spectroscopy

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Section: Xps Analysis Of the Optimized Tnp Vs Degussa P 25 Titaniamentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

X-Ray Spectroscopy Tools for the Characterization of Nanoparticles

Hussain¹,

Saracco²,

Russo³

2012

X-Ray Spectroscopy

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“…All chemicals used here were of analytical grade. Using TS110 as an example, samples were named as follows: TS represents titania-silica, and the first numeral 1 indicates process 1 (2 and 3 denote process 2 and 3, respectively); the last two numerals indicate 10 mol% SiO 2 added to titania precursor, based on the molar ratio x%=[SiO 2 /(TiO 2 +SiO 2 )]×100% (x=10, 20,30). Chemical proportions of the three types of TS oxides are shown in Table 1, and the preparation processes of them are as follows: (i) Process 1.…”

Section: Methodsmentioning

confidence: 99%

Surface chemical structure of titania-silica nanocomposite powder

Wang

Sun

2008

Sci. Bull.

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“…In fact, the present research has shown the secondary role of these structural parameters in comparison with anatase content. Toma et al [37] also highlight the role played by the hydroxylation state of the coating surface in enhancing photocatalytic performance. Finally, other authors state that, since the plasma used for thermal spraying is a strong UV-light source, photogenerated holes can yield the formation of surface-bound hydroxyl groups, which are oxidising agents and play important roles in photocatalytic reactions [38].…”

Section: Uv Irradiation Time (H) Mb Concentration (Ppm)mentioning

confidence: 99%

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Bordes

Vicent

Moreno

et al. 2014

Ceramics International

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Cita bibliográfica / Cita bibliogràfica (ISO 690):BORDES, Mari Carmen, et al. Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying. Ceramics International, 2014, vol. 40, no 10, p. 16213-16225. AbstractAtmospheric plasma spraying (APS) has been proved useful in obtaining TiO 2 coatings with effective photocatalytic activity. However, the influence of feedstock characteristics on photocatalytic activity has hardly been addressed.This study was undertaken to prepare TiO 2 photocatalytic coatings by APS from different feedstocks. The feedstocks were obtained by spray drying suspensions of a nano-and a submicron-sized TiO 2 powder, with different solids contents and/or ratios of the nano-to submicron-sized particles. All the resulting powders were fully 2 characterised to assess their suitability for use in APS processes. Feedstock powders were then deposited on steel coupons by APS using hydrogen or helium as secondary plasma gas. Coating microstructure and phase composition were characterised. Coating photocatalytic activity was determined by measuring the degradation of methylene blue dye in an aqueous solution.Powder characterisation showed that all feedstocks met plasma spray operation requirements with regard to agglomerate size distribution and density, as well as to powder flowability. Optimum agglomerate density was obtained when a well-balanced mixture of nano-and submicron-sized particles was used.All coatings displayed a bimodal microstructure with partially melted agglomerates that retained the initial nano-or submicron-sized structure and composition (anatase phase) of the feedstock, surrounded by a fully melted matrix mainly formed by rutile. As expected, coating porosity as well as the amount of partially melted areas depended strongly on plasma spray conditions and on feedstock characteristics.With regard to photocatalytic activity, a reasonably good fit of a first-order kinetic model to the experimental data was found for all coatings. The kinetic constants obtained displayed higher values than those of a commercial sol-gel coating. The values of these constants were related to feedstock characteristics as well as to plasma spraying conditions on the basis of anatase content. The contribution of other factors to the resulting coating surface is also discussed.

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Microstructure and environmental functionalities of TiO2-supported photocatalysts obtained by suspension plasma spraying

Cited by 87 publications

References 35 publications

X-Ray Spectroscopy Tools for the Characterization of Nanoparticles

X-Ray Spectroscopy Tools for the Characterization of Nanoparticles

Surface chemical structure of titania-silica nanocomposite powder

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

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