Photooxidation of APAP in water induced by the photolysis of Fe(III)–oxalate complexes is investigated.Initial concentration,pH value and Fe/oxa ratio could affect the photodegradation efficiency.The photodegradation efficiency of APAP increased with decreasing the initial concentration in the range of 25.0–100.0μmol·L-1 under the condition of pH 4.0,20.0 μmol·L-1 Fe(III),300.0μmol·L-1 oxalate.For pH value and Fe/oxa ratio,in fact,these two aspects are integrated into one point that they both had an important effect on the competition between formation of Fe(III)–oxalate complexes and Fe(III)–OH complexes,which have an important effect on the formation of H2O2 and ·OH radicals.
