In order to explore the removal methods, transformation, environmental fate, effect and potential risk of dyes in environmental water,monoazo dye acid yellow 17( AY17) was selected as model compound to investigate the degradation possibility in different advance oxidation processes( AOPs),and the degradation efficiencies followed the order of UV / H_2O_2< UV / Na_2S_2O_8≈UV/FeSO_4·7H_2O < UV / KHSO_5< UV / TiO_2. Subsequently,the different parameters such as catalyst amounts,reaction temperature,substrate c...