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To completely utilize the high redox ability of photo-induced charge carriers. Here, a Z-scheme photocatalyst of TiO 2 QDs/Bi 12 TiO 20 (TBT) composites with TiO 2 QDs fragment attached to the surface of Bi 12 TiO 20 (BTO) was prepared and the photocatalytic activity was evaluated by degradation of gatifloxacin (GF). The optimal photocatalytic performance of TBT displayed 3 times higher than bare BTO. The improved photocatalytic performance was ascribed to the effective separation of the charge carriers between TiO 2 QDs and BTO via the direct Z-scheme heterojunction. Such a strategy for the construction of Z-scheme TBT composites for removal of organic pollutants, proving new insights into design photocatalyst. • A TiO 2 quantum dots fragment was prepared and covered on the surface of Bi 12 TiO 20. • A Z-scheme heterojunction was formed between TiO 2 QDs and Bi 12 TiO 20. • The TOQs played as the sensitizer to increase the photocatalytic activity. [ABSTRACT FROM AUTHOR]