Hydrothermal Synthesis Of Tio₂ Nano-material

In this paper, hydrothermal method was adopt at 180℃for 24 h with fill factor 68%. We use TiCl₃ as the titanium source, short rutile TiO₂ nanorod was synthesized in pure water condition, when adding sodium dodecyl sulfate ( SDS ) with different concentration(0.0133 mol/L,0.133 mol/L) as surfactant, anatase TiO₂ nano-particles were synthesized when the concentration was 0.0133 mol/L, flower-like anatase TiO₂ nanorod beam was synthesized when the concentration was 0.133 mol/L. We conclude that the adding of surgactant can influence the phase and the morphology of TiO₂.We study the influence on the synthesis of titanate by adding different mineralizer (NaOH, KOH) with different concentration. Using TiO₂ as the precursor under hydrothermal condition at 150℃for 24 h, Conclusions are as follows: when the concentration of NaOH is low, the precursor cannot change to sodium titanate completely, and the offspring is nano-fibers, the conversion is increasing with the increasing of NaOH concentration, the offspring change to sodium titanate nanotube totally at 10 mol/L. however, only a part of TiO₂ change to potassium titanate nano-fiber when the concertration of KOH is 15 mol/L.Use steam hydrothermal method to further treat sodium titanate nanofiber, sodium titanate nanofiber and nanotube which was washing by 0.1 mol/L HCl at 180℃for 24 h, all the product were anatase TiO₂. the sodium titanate fiber which was not washing by HCl was breakdown, whereas the fiber after picking can holding fiber structure well. After further steam hydrothermal processing, the tube which was washing by HCl was transform to anatase TiO₂ nano-particles shaped diamond,square and parallelogram. Then long anatase TiO₂ nanorod with the size of 60 nm×400 nm was prepared via secondary hydrothermal method by treating sodium titanate fiber added stirring process. And the surface of the crystal is more smooth and clean. Then, we study on the influence of doping Fe3+ by adding little FeCl₃·6H₂O in the hydrothermal process and anatase TiO₂ doping Fe3+ was prepared.