**4. Conclusions**

N-doped Cu2O/ZnO nanocomposite was synthesized by co-precipitation and thermal decomposition methods. The absorption edge of the nanocomposite was more extended to the visible region of electromagnetic radiation compared to ZnO, Cu2O and Cu2O/ZnO nanomaterials. The photocatalytic activity of N-doped Cu2O/ZnO nanocomposite has enhanced efficiency than ZnO, Cu2O and Cu2O/ZnO nanomaterials. The enhancement is due to the coupling of Cu2O and ZnO semiconductors, which can drop the recombination rate of the charge carriers, and improve the absorption and utilization ability to sunlight. In addition to that, doping the nanocomposite with nitrogen can outspread the photoabsorption to longer wavelengths. Based on the findings, N-doped Cu2O/ZnO nanocomposite is an effective solar light active photocatalyst that can be used for the removal of organic dyes from wastewater.

**Author Contributions:** All the authors participated in conceptualizing, executing, analyzing, editing, and reviewing this article.

**Funding:** This research received no external funding.

**Conflicts of Interest:** The authors declared no conflict interest.
