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Mesoporous hollow spherical titanium dioxide preparation method

A technology of hollow spherical titanium dioxide, applied in the field of preparation of mesoporous hollow spherical titanium dioxide, to achieve the effect of stable product shape, easy control of process conditions, and low price

Active Publication Date: 2014-10-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pH of the precursor sol is neutral, without addition, and the method of using water as a solvent is rarely reported.

Method used

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  • Mesoporous hollow spherical titanium dioxide preparation method
  • Mesoporous hollow spherical titanium dioxide preparation method
  • Mesoporous hollow spherical titanium dioxide preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Accurately weigh 5g of commercially available TiOSO with an electronic balance 4 .xH 2 SO 4 .xH 2 O white powder, placed in a 500mL transparent beaker filled with 200mL deionized water, stirred with a glass rod to make it evenly dispersed in water, and then left to stand for more than 12h to completely dissolve to form a colorless transparent solution;

[0043] (2) TiOSO that will dissolve completely 4 Put the solution into a magnetic stirrer, put a stirring bar, turn on the power, and stir at a medium speed; at the same time, fix a 100mL constant pressure dropping funnel to the iron stand, and pour a certain volume of 3mol / L ammonia water; then Slowly open the glass cock, and drop the excess ammonia into the TiOSO 4 In the solution, use pH test paper to roughly measure the pH during the whole process until the pH of the white precipitate is 9-10;

[0044] (3) Transfer the white precipitate to a cleaned G4 sand core funnel, filter and wash it several times with...

Embodiment 2

[0049] (1) Adopt the equipment and operating steps of steps (1)~(4) and (6) in Example 1, prepare TiOSO by the same method 4 Sol, after aging for more than 6 hours, and dilute according to the volume ratio of sol and deionized water 1:1;

[0050] (2) Spray-dry the diluted sol, keep the compressed air for spray-drying at 0.30MPa, the inlet temperature at 120°C, and the feed flow rate at 400mL / h to obtain light yellow precursor powder;

[0051] (3) Put the obtained pale yellow precursor powder in a crucible, set the temperature program (5°C / min, 700°C for 2h), and calcinate at high temperature in a muffle furnace to obtain mesoporous hollow spherical titanium dioxide powder.

[0052] (4) Characterized by the crystal phase composition of the X'Pert PRO X-ray diffractometer (XRD) sample produced by Holland PANalytical Company, the XRD results are as follows Figure 4 Shown; Hitachi S-4700II type field emission scanning electron microscope is used to characterize the morphology of...

Embodiment 3

[0054] (1) Adopt the equipment and operating steps of steps (1)~(4) and (6) in Example 1, prepare TiOSO by the same method 4 Sol, after aging for more than 24 hours, and dilute according to the volume ratio of sol and deionized water 1:1;

[0055] (2) Spray-dry the diluted sol, keep the compressed air for spray-drying at 0.30MPa, the inlet temperature at 180°C, and the feed flow rate at 900mL / h to obtain light yellow precursor powder;

[0056] (3) Put the obtained pale yellow precursor powder in a crucible, set the temperature program (5°C / min, 700°C for 2h), and calcinate at high temperature in a muffle furnace to obtain mesoporous hollow spherical titanium dioxide powder.

[0057] (4) Characterized by the crystal phase composition of the X'Pert PRO X-ray diffractometer (XRD) sample produced by Holland PANalytical Company, the XRD results are as follows Figure 6 Shown; Hitachi S-4700II type field emission scanning electron microscope is used to characterize the morphology o...

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Abstract

The invention discloses a method for preparing mesoporous hollow spherical titanium dioxide. The method comprises the following steps: titanyl sulfate and ammonia water are subjected to co-precipitation; an obtained precipitate is fully washed by using water and is diluted by adding water, such that the precipitate is uniformly dispersed; hydrogen peroxide is added for carrying out a peptization reaction; aging is fully carried out such that a dark yellow transparent sol is obtained; deionized water is used for diluting; spray drying is carried out; and calcining is carried out, such that mesoporous hollow spherical titanium dioxide powder is obtained. The method provided by the invention has the advantages of no pollution, no additive, and no equipment corrosion. The method is green and environment-friendly.

Description

(1) Technical field [0001] The invention relates to a method for preparing mesoporous hollow spherical titanium dioxide by spray drying technology. (2) Background technology [0002] Titanium dioxide (TiO 2 ) is a cheap, safe, non-toxic and extremely stable semiconductor photocatalytic material. , photocatalysts, cosmetics, advanced coatings, white pigments and environmental purification and other fields have been widely used. [0003] There are many shapes of titanium dioxide, and different shapes determine its different properties. Mesoporous hollow spherical titanium dioxide has excellent structural characteristics such as low density, high surface area, good surface permeability and electron capture ability, especially its hollow special structure, which makes it have the ability to "wrap" other components. Therefore, mesoporous Hollow spherical titanium dioxide not only has excellent performance in the field of photocatalysis, but also is widely used in the field of ...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 李国华章益维
Owner ZHEJIANG UNIV OF TECH
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