The work was performed in the framework of the National Institute of Photonics (INCT de Fotônica). We acknowledge the Nanotechnology National Laboratory (LNNano) for HR-TEM measurements.
CdS; CdS/Cu2O; Methyl orange; Photocatalytic efficiency
With the development of economy and society, environmental pollution RO5126766（CH5126766） increasing seriously, especially for water pollution. Photocatalytic technology is a very effective method for the treatment of environmental pollutants , , ,  and .