Cu-doped In2S3 hierarchical structures for photocatalytic organic dye degradation under visible light irradiation

•Flower-like Cu-doped In2S3 was constructed through a one-step hydrothermal method.•Cu-doping enhanced visible-light response and BET surface area of In2S3.•Cu-doped In2S3 exhibited excellent adsorption and catalytic degradation activity of Rhodamine B.•Superoxide ion radical was the main active substance in initiating the degradation of Rhodamine B.