Characterization of a new photocatalytic textile for formaldehyde removal from indoor air
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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► New photocatalytic textile integrating photocatalyst and light. ► Characterization of photocatalytic lighted textile by optic and electronic microscopy. ► Light emission modelling: quantification of diffuse and intense light. ► Efficiency of photocatalytic lighted textile for removing formaldehyde.
Journal: Applied Catalysis B: Environmental - Volume 128, 30 November 2012, Pages 171–178