PHOTODEGRADATION OF CHLOROFLUOROCARBON ALTERNATIVES ON METAL-OXIDE

HCFC and HFC were photodegraded on metal oxides. Degradation mte on se veral metal oxides was in the order. TiO2 > ZnO > Fe2O3 > kaolin great er-than-or-equal-to SiO2 greater-than-or-equal-to Al2O3. Principal deg radation products were CO2, Cl- and F-. Minor products which oxidize I - were included for some HCFC's. A photocatalytic process is suggested for the degradation reaction. An overall reaction equation is propose d on the basis of mass balance.