Polyimide composites modified by C.I. Pigment Green 8 with enhanced crystalline structure for efficient photo-Fenton oxidative degradation of tetracycline hydrochloride

•Simple methods of impregnation and thermal treatment are used to synthesis PGPI composites.•PGPI composites modified by PG8 have a strong π-π stacked crystalline structure.•Photo-Fenton synergistic catalytic system accelerates Fe2+/Fe3+ cycling and effectively inhibits photogenerated carrier recombination.•PGPI composites possess high photo-Fenton catalyzed oxidative degradation efficiency driven by visible light.