Methods for Magnetization of Nano Titaniumdioxide Photocatalyst in Order to Improve its Performance

One of the most important problems related to application of titanium dioxide (TiO2) photocatalyst is its recycling and separation from aqueous system after the reaction. This problem has limited applications of TiO2 in wastewater treatment. Magnetization of TiO2 and using a magnetic field for separation is one of the most effective methods which have been mostly used to solve these challenges. In this review study, magnetization of TiO2 photocatalyst and methods to improve its performance was evaluated. Researches show that the composition of the magnetic material affects the photocatalytic activity of TiO2 and the activity increases by reduction the magnetic materials. The middle layer of SiO2 increases the stability of the magnetic properties and photocatalytic activity. CoFe2O4 in comparison to NiFe2O4 and Fe3O4 has the best magnetization effect. However, Fe3O4 due to some features such as non-toxicity, low price, high stability and excellent ferromagnetic properties is more considered. Studies show that graphene due to its unique properties, has significant impact on the performance of magnetic TiO2 photocatalyst.