Photocatalytic degradation of some organics has been studied using some metal oxide or sulfide photocatalysts.The most commonly studied photocatalysts include: TiO 2 , ZnO, WO 3 , Fe 2 O 3 , and ZnS ) 1(.The oxidation ability is an important factor for degradation of organics using photocatalytic oxidation technique.The photo generation of valence band holes (h vb ) and creation of hydroxyl radica...