Synthesis of Magnetic TiO2 Particles for a Recoverable Application on Water Treatment
The magnetic photocatalysts (MPCs) can provide both a high specific surface area and an alternative for recovering used catalyst from treated water by the application of a magnetic field. In this study, the Fe3O4 particles were synthesized by co-precipitation under alkaline condition. After annealing, the suspension of magnetite particles can be separated by magnet. The magnetite particles were dried and then mixed with TTIP (titanium tetraisopropoxide) for sol-gel method. The MPCs were then achieved after dried and calcined in 300°C. The MPCs synthesized in this study can be separated from treated water by a simple magnet. The photocatalytic abilities of synthesized MPCs were evaluated by measuring the residual methylene blue (MB) amounts after irradiation under a light intensity of 1.0 mW/cm2 at 365 nm. The results showed that the synthesized MPCs had good crystallinity of anatase and magnetite. The MPCs can be separated by a simple magnet and did not reduce the photocatalytic abilities significantly. With the advantages of reusability, durability, and separability the synthesized MPCs in this study appear a good alternative for water treatment and widely other potential applications. A MPC with an optimal Fe/Ti ratio and smaller particle size is expected to perform a more practical alternative on water treatment in the future.
C. H. Shen et al., "Synthesis of Magnetic TiO2 Particles for a Recoverable Application on Water Treatment", Advanced Materials Research, Vols. 255-260, pp. 2710-2713, 2011