(OH●) BY PHOTOCATALYSIS
The solution of UV irradiation implies the need to circulate air through a central duct, but misses protection from those who may bring contamination.
The production rate of (OH·) radicals is low and they are obtained at a low concentration, so the entire biochemical reaction time is long, in the range of 15 - 360 min.
These technologies are only effective in small spaces.
A large number of chemical reagents such as H2O2, TiO2 or Fe2+ are necessary in the production process of (OH·), which results in high costs and a safety problem due to the generation of toxic degradation intermediates and the deactivation of the material