Hydrothermal Synthesis Of Flower-like TiO₂ And Photocatalytic Degradation Of Organic Matter

Titanium dioxide because of its strong oxidizing, high catalytic activity, good stability, non-toxic, cheap characteristics has become a hot research topic. In this paper, three-dimension flower-like TiO2 has been synthesized by the hydrothermal method. At the same time, the influence of various factors on the product is analyzed. And under the irradiation of ultraviolet light, we did the experiment that the three-dimension flower-like TiO2 how to dioxide on the degradation of organics. The detail of the thesis is as follow:In this paper, using the hydrothermal method, We use of high purity titanium powder with a mixture of HNO3、 H2O2 and NaOH, then, the flake flower titanium dioxide was synthesized by the method of hydrothermal nanostructures. Preparation process, with the increase of concentration of HNO3, three-dimension flower-like TiO2 micro-nanostructures petals narrower; with the increase of concentration of hydrogen peroxide, three-dimension flower-like TiO2 micro-nanostructures petals wider; with the increase of concentration of NaOH, three-dimension flower-like TiO2 micro-nanostructures petals wider; with the increase of time, three-dimension flower-like TiO2 micro-nanostructures petals longer and denser; with the increase of the temperature, the flower-like TiO2 micro-nanostructures petal to widen narrowed. The best grain size of the TiO2 is 2.2μm to 2.4μm, Made up of many radiating, made by the center, Flake petals of flower shape structure, Flake petal length is about 1.0μm, width of 45 to 140 nm, thickness of a few nanometers. After high temperature treatment, the structure of the product has not been destroyed, still has high specific surface area, up to 131.9 m2g-1.The use of hydrothermal preparation of titanium dioxide powder, the organic matter of rhodam ine B has been degradated under the photocatalytic situation, Under ultraviolet light, observing the fade of rhodam ine B and ultraviolet-visible spectrophotometer was determined. Through the analysis, Ultraviolet light catalytic degradation curve is found, The three-dimension flower-like TiO2 micro-nanostructures petals wider, the better the photocatalytic performance. At the same time, through with the other three types of titanium dioxide powder single light catalytic contrast, reflects the preparation of the samples that have superior photocatalytic performance, And comparing with Degussa P25 TiO2 powder cycle of degradation, Further confirmed, Preparation of TiO2 samples that have superior photocatalytic performance and better recycling.