Continuous deep photocatalytic degradation method for phthalate plasticizer in all-weather water body

The invention discloses an all-weather continuous deep photocatalytic degradation method of a phthalate plasticizer in a water body, and particularly relates to a visible light-driven all-weather continuous deep degradation method of phthalate in the water body under the conditions of room temperature, normal pressure and neutrality by using D-A type double ion doped functionalized g-C3N4 as a heterogeneous photocatalyst and air as an O2 source. Under the driving of visible light, H2O2 is co-produced while the D-A type double-ion-doped functionalized g-C3N4 photocatalytically degrades PAEs, a bivalent iron salt is introduced to construct an in-situ photo-Fenton system with the generated H2O2 under the condition of no illumination, a perylene-3, 4, 9, 10-tetracarboxylic dianhydride or 1, 4, 5, 8-naphthalene tetracarboxylic anhydride unit and a cyano functional group serve as a photo-induced electron storage bank, photo-induced electrons are released, Fe < 3 + > is reduced into Fe < 2 + >, and the PAEs and the