Abstract: Cu₂O powders and TiO₂-Cu₂O composite powders were prepared by chemical deposition method. With prepared Cu₂O nanoparticles as photocatalyst，photocatalytic oxidation degradation of methylene blue solution was explored. The effects of dosage of H₂O₂，the initial concentration of methylene blue and composite samples on the degradation performance were investigated with UV-visible spectrophotometer. The results showed that the degradation efficiency was the best when the amount of H₂O₂ was 5mL in 30mL methylene blue solution and the initial concentration of methylene blue was 10mg / L，and the catalytic efficiency of TiO₂-Cu₂O composite powders was much higher than that of Cu₂O.

Key words: cuprous oxide nanoparticles, photocatalytic degradation, composite powders, methylene blue