This　paper　considers　the　degradation　of　dimethyl　phthalate　(DMP),　a　highly　toxic　endocrine　disrupter.　by　a　novel　Fenton　reaction　involving　a　new　catalyst　Si-FeOOH　with　H2O2　under　UV365　irradiation.　Si　was　selected　for　its　non-toxic　and　less　secondary　pollution　and　the　new　catalyst　Si-FeOOH　was　synthesized　by　adding　Si　to　the　amorphous　FeOOH.　The　experiment　showed　that　the　physical　strength　of　new　catalyst　Si-FeOOH　was　enhanced　when　Si/Fe　was　0.2　and　the　opportunity　of　dissolved　iron　was　also　reduced.　The　efficiency　of　DMP　degradation　by　UV/Si-FeOOH/H2O2　could　reach　97%　after　30　min　reaction　time　at　pH　5,　0.5　g/L　dosage　of　Si-FeOOH,　and　2.0　mmol/L　of　H2O2　under　125W　UV365　irradiation.　DMP　could　be　degraded　effectively　by　synergistic　effect　of　UV,　Si-FeOOH　and　H2O2　due　to　the　catalytic　absorption　and　free　radicals　reaction　of　FeOOH　under　the　UV　irradiation.　The　Si-FeOOH　photocatalyst　can　be　very　easily　recycled　and　the　efficiency　of　DMP　photodegradation　can　also　remain　87.1%　after　six　runs　of　DMP　degradation.　(C)　2010　Elsevier　B.V.　All　rights　reserved.