**4. Conclusions**

Highly oriented nanostructures of pure and TiO2 incorporated with different Fe2O3 contents (TiO2)1−x(Fe2O3)x, where x = 0, 0.1, 0.5, and 1.0 for pure TiO2 and Fe2O3 incorporated 0.1, 0.5, and pure Fe2O3 which are denoted as PT, 0.1F, 0.5F, and PF, respectively) were prepared by a sol-gel approach. X-ray diffraction studies revealed the polycrystalline tetragonal anatase phase, and the pure Fe2O3 is formed in the rhombohedral hematite structure. From SEM images, all the individual particles are uniformly distributed throughout the surface of the sample. FT-IR studies revealed that at higher incorporating concentration and in pure Fe incorporating, the intensity of band is increased. The decreasing bandgap with increasing incorporating concentration indicates that the present samples have huge applications in optoelectronic devices. The BET surface areas are high because of the mesoporous nature of the prepared composites. The synthesized TiO2 NPs in the present work are very active under UV irradiation with high photonic efficiency. We continue our efforts to examine the synthesized photocatalysts under visible light irradiation employing different pollutants. All the promising results of the prepared samples clearly indicate their huge applications in the field of wastewater treatment.

**Author Contributions:** Methodology, M.A.S. and A.M.A.; investigation, A.M.A., M.A.S. and H.M.E.-B.; writing—original draft preparation, V.G., M.A. and A.M.A.; writing—review and editing, A.M.A., H.A., H.M.E.-B. and A.A.I.; supervision, A.M.A. and H.A. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Deputyship for Research and Innovation, Ministry of Education, Saudi Arabia (Research Capability-Project number 412).

**Data Availability Statement:** Data are contained within the article.

**Acknowledgments:** The authors extend their appreciation to the Deputyship for Research and Innovation, Ministry of Education in Saudi Arabia, for funding this research work through project number 412.

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

### **References**

