Up to this day, no uniformly standardized measurement and materials standards are available. Laboratory-scale measuring methods for quantifying the photocatalytic activity of surfaces are available. The results they provide are, however, only conditionally comparable.
Titanium dioxide as photocatalyzer
Titanium dioxide, thanks to its high whitening and covering power, is the best known and most frequently used white pigment. It is used in lacquers, paints, plastics and paper.
One specially manufactured form of titanium dioxide has been known for some time as photocatalyzer. The construction...