Assessment of photocatalytic activity of Solaronix™ nanostructured anatase

The efficiency of photocatalytic materials can be investigated by several direct and indirect methods. In this study, photocatalytic materials are prepared from TiO2 Solaronix™ nano-suspension by dip- and spin-coating methods. The photocatalytic activity of coatings is then assessed for several deposition and analysis parameters. An on-line indirect measure method is presented. This method is based on stearic acid degradation and allows the assessment of non-transparent photocatalytic films and displays a high sensitivity. The influences of nano-powder diameter and sintering temperature on film photocatalytic activity are discussed. The reproducibility of the assessment method is presented, and its dependency toward temperature and humidity is measured. Titanium dioxide films prepared from nano-powders are compared to similar coatings in order to illustrate the subject.