Adsorption and Photocatalytic Oxidation of Formaldehyde on a Clay TiO2 Composite.

摘要

We evaluated the performance of hectorite-TiO2 nanocomposites with respect to the reference material P25 under controlled conditions of relative humidity, UV irradiation and residence time, using formaldehyde as a target compound. Overall, the clay-TiO2 composite showed comparable efficiency in the removal of the model pollutant when normalized by the mass content of TiO2.These results support the use of clay-TiO2 composites as pollution-removing active ingredients in the formulation of paints, coatings, pavement and cement. Potential benefits of incorporating TiO2 nanoparticles in the clay matrix include higher durability, slower inactivation, and avoiding leaching of nanoparticles to the environment. These results complement those reported previously using toluene as a target compound [15], allowing us to characterize the clay-TiO2 photocatalyst by challenging it with model hydrophobic and hydrophilic organic pollutants that are relevant to indoor environments and atmospheric chemistry.