Cadmium sulphide quantum dots sensitized hierarchical bismuth oxybromide microsphere with highly efficient photocatalytic activity

► The uniform hierarchical BiOBr microspheres were modified with CdS quantum dots. ► The CdS-BiOBr photocatalyst exhibited strong visible light response. ► CdS-BiOBr photocatalyst displayed enhanced photocatalytic activity. ► A photocatalytic mechanism was proposed.