Photochemical transformations of sodium anthracene-1-sulfonate in oxygen-saturated aqueous titanium dioxide suspensions (original) (raw)

Ž. Ž. The decomposition of sodium anthracene-1-sulfonate AN1S by irradiation l) 300 nm was investigated in oxygensaturated aqueous solutions and TiO suspensions. The concentration decrease of AN1S during exposure follows the formal 2 first-order kinetics. The formation of phthalic and salicylic acids was monitored by high performance liquid chromatography Ž. HPLC in both photosystems. Additionally, the formation of alizarin during irradiation in the presence of TiO was 2 Ž. confirmed. The effect of experimental conditions initial AN1S concentration, pH value, TiO concentration on the formal 2 initial rate of AN1S photodegradation was studied in details. In situ EPR spin trapping experiments in TiO suspensions 2 Ž. confirmed the competitive reaction of photogenerated hydroxyl radicals between 5,5-dimethyl-1-pyrroline N-oxide DMPO spin trap and AN1S.