Hydrothermal crystallization preparation method of high activity ball shaped nano-crystal titanium dioxide powder photocatalyst
A titanium dioxide and photocatalyst technology, applied in catalyst activation/preparation, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of grain agglomeration and reducing the specific surface area of TiO2 powder
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0038] Preparation of Spherical TiO by Hydrothermal Method 2 The method of powder photocatalyst is as follows: accurately weigh 18 grams of titanium sulfate Ti (SO 4 ) 2 Dissolve in 150ml distilled water, stir continuously, then weigh 9 grams of urea (CON 2 h 4 ) was dissolved in the above solution and stirred until the urea (CON 2 h 4 ) until completely dissolved. Then the reaction solution was put into a 200ml reaction kettle, and the reaction kettle was hydrothermally treated at 180° C. for 3 hours. Take out the reaction kettle, and after the reaction kettle is cooled to room temperature, separate the precipitate, wash the obtained precipitate repeatedly with distilled water until neutral, and finally dry it in vacuum at 80°C for 6 hours to obtain highly active TiO 2 powder photocatalyst. Titanium sulfate (Ti(SO 4 ) 2 ) and urea (CH 4 N 2 O) at molar concentrations of 0.5 and 1M, respectively.
Embodiment 2
[0040] In order to examine the effect of hydrothermal time on TiO 2 The influence of the phase structure, specific surface area, grain size, morphology and photocatalytic activity of powder photocatalysts, except for the different hydrothermal time, other reaction conditions such as the concentration of titanium sulfate and urea, the amount of solvent water, and the hydrothermal temperature etc. Exactly the same as Example 1. It was found that the sample exhibited the best photocatalytic activity when the hydrothermal time was 3 hours, and its degradation rate constant was 4.24×10 -3 (min -1 ). This is due to the fact that the sample not only has a high specific surface area, but also has good crystallization.
[0041] figure 1 Indicates TiO prepared by hydrothermal treatment at 180°C for different times 2 The XRD pattern of the powder, it can be seen from the figure that when the hydrothermal time is 1 or 1.5 hours, the obtained TiO 2 Powder crystallinity is very poor, ...
Embodiment 3
[0046] In order to examine the effect of hydrothermal temperature on TiO 2 The influence of phase structure, specific surface area, grain size, morphology and photocatalytic activity of powder photocatalyst, in addition to the different hydrothermal temperature, other reaction conditions such as the concentration of titanium sulfate and urea, the amount of solvent water, hydrothermal time, etc. Exactly the same as Example 1. It was found that when the hydrothermal temperature was 160 °C, the sample exhibited the best photocatalytic activity, and its degradation rate constant was 4.99×10 -3 (min -1 ). This is because when the hydrothermal temperature is too low, the sample is amorphous; and when the temperature is too high, the specific surface area of the sample decreases. When the hydrothermal temperature is 160 °C, the sample not only crystallizes well, but also has a large specific surface area, thus showing the best photocatalytic activity.
[0047] Figure 4 Repres...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More