Hydrothermal Synthesis Of Anatase TiO₂ With Different Morphology And Analysis On The Influencing Factors

The anatase TiO2 with different morphology was prepared by hydrothermal method. The prepared samples were characterized by different methods such as X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), High-resolution Transmission Electron Microscopy (HRTEM), Fourier Transform Infrared (FT-IR) Spectrometry. The degeneration of rhodamine B was used as a model reaction to test the photocatalytic activity of the samples. The growth mechanisms for TiO2 with different morphology were discussed and the influencing factors were also analysed.The experimental results show that TiO2 with different morphology can be prepared by hydrothermal method under varied conditions. When using TBAOH as peptizer, the ratio of [N]/[Ti] was an important factor for formation of different shaped particles and the addition of TEOA can also influence the shape and the photocatalytic activities of the formed particles. When ratio of [N]/[Ti] was 0.125 with TEOA adding, the prepared sample showed higher photocatalytic ability.Different solvents such as toluene and ammonia were used to investigate the effects of polarities of the solution on the shape of the prepared samples. The results show that the sample prepared by using ammonia as solvent was the rod-like and showed higher photocatalytic activity, while the sample prepared by using toluene as solvent had spindle-like shape.When using different kind of ammonium as peptizers, the effects of carbon chain length of ammonium on the shape were investigated. The prepared particles were all anatase and owned the high crystallization degree. The sample prepared by using the ammonium with shorter carbon length showed smaller size and higher photoactivity activity.