OZONE DESTRUCTION ON SOLID PARTICLES

Ozone (O-3) is an important constituent of the Earth atmosphere, eithe r stratosphere, where it has a beneficial role to protect Earth's surf ace from harmful UV-B radiation, or troposphere where it is considered an air pollutant. We investigated the ozone destruction on solid part icles of natural or anthropogenic origin as: silica-gel, pollen, coal fly ash, titanium dioxide with different specific surface (s) and sodi um halides (NaCl, NaBr and NaI) The experiments were conducted in a fl uidized bed reactor with elevated ambient concentrations of O-3 (100 p pb) employed. The results indicate that the destruction of O-3 depends upon: sample quantity (silica-gel with equal s), sample surface (TiO2 with different s) and chemical composition (coal fly ash comparative to wood ash). Interesting results were obtained with sodium halides: n o effect on O-3 concentrations was detected with NaCl, NaBr shows a ce rtain destruction, while NaI removes completely O-3 from the air strea m. In the experiments with NaI doped NaCl, the destruction of O-3 was dependent on Nar quantity.