**5. Conclusion**

This review mainly highlighted the importance of the development of wide bandgap metal oxide nanoparticles for photocatalyst applications. Several researchers *Tuning the Magnetic and Photocatalytic Properties of Wide Bandgap Metal Oxide… DOI: http://dx.doi.org/10.5772/intechopen.110422*

are primarily focused on developing a room-temperature ferromagnetic TiO2 as the photocatalyst, which has a high potentiality to absorb visible light from the solar spectrum. However, there are certain limitations in pristine TiO2 nanoparticles: their high photo-generated holes and electrons recombination rate, and they require UV light for photocatalysis. These problems can be overcome by introducing metallic or non-metallic dopants or creating oxygen vacancies and defect sites into TiO2. The two successful approaches that have been discussed are the doping and grafting of TiO2 nanoparticles with either anionic or cationic elements and coupling TiO2 nanoparticles with other semiconductors. Further study is needed to understand the use of novel ferromagnetic metal oxide-based photocatalyst for large-scale applications.
