Bourgeois P.-A.,CNRS Research on Catalysis and Environment in Lyon |
Puzenat E.,CNRS Research on Catalysis and Environment in Lyon |
Peruchon L.,Brochier Technologies |
Simonet F.,CNRS Research on Catalysis and Environment in Lyon |
And 4 more authors.
Applied Catalysis B: Environmental | Year: 2012
The treatment of volatile organic compounds (VOCs) from different sources (industrial process, human activity, release of pollutants by materials, etc) in confined areas is a major challenge to prevent human health issues. Actually, one stays around 80% of a day in closed areas. The photocatalytic process is now recognized as an efficient method to remove organic pollutants present in gaseous phase. However, there are still some drawbacks with current reactors as for example lightutilization limitations due to absorption and/or scattering by the reaction medium or as restricted processing capacities due to mass transport limitations. The solution proposed in this work lies in the use of a lighted textile with optical fibers. The polymer optical fibers are treated to allow a radial leak of light through several dotted lights, allowing the carrying and the supply of UV light onto the overall textile area. Once coated using a suspension of TiO2, the textile becomes a photocatalytic materials for which UV light is carried into the bulk of the photocatalytic bed. The modifications of the fibers surface have been characterized by ESEM. The topology was characterized by optical microscopy and the radiant flux was measured by radiometry. The characteristics of the coating such as the photocatalyst content, its location and its adherence have been studied to understand the coating properties. The photocatalytic efficiency of samples coated with TiO2 was measured using formaldehyde as model molecule. The results obtained with a such new textile are very encouraging because this innovation allows to imagine a three dimensional light sources irradiate photocatalytic bed either its surface than its bulk. New perspectives in photocatalytic process are so opened. © 2012 Elsevier B.V.
Indermuhle C.,University Claude Bernard Lyon 1 |
Puzenat E.,University Claude Bernard Lyon 1 |
Simonet F.,University Claude Bernard Lyon 1 |
Peruchon L.,Brochier Technologies |
And 2 more authors.
Applied Catalysis B: Environmental | Year: 2016
Optical fibre fabric developed by Brochier® Technologies Company is studied for water treatment field application. By TiO2 deposition on this type of textile, the interaction between photocatalyst and UV irradiation can be strongly improved. Indeed the internal irradiation promotes the absorption of light. However, the problem is the ageing of optical fibres induced by UV exposure in the presence of TiO2 coating. Two different optical fibre fabrics were compared in term of optical ageing properties. One optical fabric was coated by TiO2 only; the other fabric was protected by a silica layer before being coated by a photocatalyst. Irradiance measurements of local light emission along ageing process were carried out and were fitted with a theoretical expression of the phenomenon. Macroscopic observations were related to microscopic behaviour on the surface of the fabric. Optical Microscopy (OM) before and after UV exposure confirm the theoretical model suggesting that the ageing induce an increase of existing holes besides appearing of new holes. These measurements show an important ageing under UV irradiation of the fabrics not protected by a SiO2 layer, leading to inhomogeneous light distribution at the surface of the textile. In presence of SiO2 layer between fabrics and TiO2 layer, no ageing was observed. Moreover, as SiO2 is transparent to UV, the photocatalyst activity does not change. © 2015 Elsevier B.V.
Brochier Technologies | Date: 2012-11-20
Lighting apparatus, namely, luminous fabrics, luminaires and flexible luminaires comprised of glass and plastic all having optical fibers woven therein to provide a very thin, low-powered lighting source using electroluminescent diodes.