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Elaboration and Characterisation of TiO2 Based Materials for the Development of the Passive Treatments for Environment (Applications to Nitrogen Oxides), in French

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Tezã de doctorat (nepublicatã)

Autori: Filofteia-Laura Toma

Editorial: p.183, 2004.


The aim of this work is the study of titanium dioxide materials in form of powders and coatings obtained by plasma spraying technique, in order to understand the influence of different parameters on the photocatalytic efficiencies versus the degradation of atmospheric pollutants such as nitrogen oxides.
An environmental test chamber was developed in the frame of this PhD thesis to study the photocatalytic activity of TiO2. The photocatalytic tests realised over different titanium dioxide powders showed that the photocatalytic efficiency strongly depend on various parameters linked to extrinsic properties of material and microstructural characteristics, where the crystalline structure is one of the most important.
To obtain titanium dioxide coatings by thermal spray, two techniques were used: plasma spraying feeding an agglomerated nanometric powder (conventional plasma spray) and thermal spraying of powders suspensions (suspension plasma spray). The elaborated coatings presented different characteristics and photocatalytic responses function of parameters and spraying methods. Once again, it was emphasized the importance of the crystalline structure over the photocatalytic properties of TiO2 coatings. The technique of suspension plasma spraying is a promising route to elaborate photocatalytic coatings for nitrogen oxides degradation.

Cuvinte cheie: photocatalysis, titanium dioxide, nitrogen oxides, photocatalytic efficiency, powder, plasma spraying, liquid suspension, photocatalytic coating