The CQDs-Bi20TiO32 photocatalysts exhibited high visible-light responsive photocatalytic activity. To achieve the cyclic utilization of CQDs-Bi20TiO32, the novel flexible CQDs-Bi20TiO32/PAN fiber membranes were prepared by a simple coaxial electrospinning technique. It was found that the CQDs-Bi20TiO32 photocatalyst could be firmly and uniformly fixed on the surfaces of electrospun fibers and the composite fiber membranes possessed the hierarchical macro- and mesoporous structure. The loaded CQDs-Bi20TiO32 endowed the composite fiber with an obvious photocatalytic activity for the degradation of the herbicide isoproturon under visible light irradiation. Among these samples, S3 at photocatalyst dosage 15 w/v% had the highest degradation efficiency for isoproturon. Meanwhile, the core-shell structured inorganic-organic hybrid fiber membranes have a significant advantage in the recyclability for photocatalyts. The flexible CQDs-Bi20TiO32/PAN electrospun fiber membranes would have potential applications in efficient removal of organic contaminants. (C) 2017 Elsevier Ltd. All rights reserved.