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Method for preparing anatase titanic oxide sol

A technology of titanium dioxide and anatase phase, applied in the fields of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc.

Inactive Publication Date: 2009-03-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, white precipitates will be formed in this process, and a special process is required to separate the precipitates to obtain a more uniform titanium dioxide film.

Method used

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  • Method for preparing anatase titanic oxide sol
  • Method for preparing anatase titanic oxide sol
  • Method for preparing anatase titanic oxide sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] After heating 100mL of 1mol / L titanium sulfate solution to 60°C, keep it warm at 60°C, add dropwise 400mL of 1mol / L sodium hydroxide solution, neutralize until the pH value is approximately equal to 7, keep it at 60°C for 4 hours, and obtain a white precipitate. Wash repeatedly with distilled water to obtain a gel-like solid. Take 80 grams of the wet precipitate (12 grams converted into titanium dioxide) and disperse it in 100 ml of 1 mol / L hydrochloric acid. Disperse the gel at 60 ° C for 2 hours to obtain a light blue transparent Sol, the concentration of titanium dioxide is 0.92mol / L.

[0041] The concentration of hydrogen ions before and after degumming was measured, and it was found that the hydrogen ions were not consumed, indicating that the degumming had nothing to do with the dissolution of orthotitanic acid. After diluting different times with deionized water, its ultraviolet-visible absorption spectrum is as follows: figure 1 As shown, there is no absorption...

Embodiment 2

[0044] Add 145mL of 3mol / L ammonia water dropwise to 100mL of 1mol / L titanium tetrachloride solution at 70°C, keep it warm at 70°C for 12 hours, neutralize to a weakly alkaline pH value of about 8, and obtain a white precipitate, which is washed repeatedly with distilled water , to obtain a gel-like solid, get 40 grams of wet precipitation (converted into titanium dioxide to be 6 grams, XRD analysis shows that what obtained under such conditions is the mixed crystal form of anatase and rutile) and disperse it in 100 milliliters of nitric acid of 1mol / L In 80°C, the gel was degelized for 8 hours to obtain a light blue transparent titanium dioxide sol. The sol contained some white precipitates that could not be resolved. After standing still, the bottom precipitate was separated by centrifugation. XRD analysis showed that the bottom precipitate was rutile phase titanium dioxide, and the upper colloid appeared similar to figure 2 (b), XRD diffraction peaks that can be attributed...

Embodiment 3

[0048] After heating 100mL of 0.5mol / L titanium sulfate solution to 40°C, add dropwise 138mL of 1.5mol / L ammonia solution to the solution, keep it at 40°C for 20 hours, and neutralize until the pH value is approximately equal to 7 to obtain a white precipitate. Wash repeatedly to obtain a gel-like solid. Take 40 grams of wet precipitate (6.2 grams converted into titanium dioxide) and disperse it in 25 milliliters of 1 mol / L hydrochloric acid and 25 milliliters of 1 mol / L nitric acid mixed solution, degumming at 65 ° C After 5 hours, a light blue transparent sol was obtained, and the concentration of titanium dioxide was 0.94 mol / L. After diluting different times with deionized water, its UV-Vis absorption spectrum is similar to figure 1 , no absorption in the visible region. The powder obtained by vacuum drying was subjected to X-ray diffraction analysis, and the results showed that the titanium dioxide therein was an anatase phase, similar to figure 2 (b) shown.

[0049] ...

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Abstract

The invention relates to a preparation method of anatase phase titanium dioxide sol. The invention utilizes inorganic acid which contains titanium as a main material to conduct pyrohydrolysis on a solution of inorganic acid to get anatase phase or titanium dioxide white sediment of anatase and rutile mixed crystal; and adopts mineral acid as a dispergator to conduct dispergation at the temperature of 50 to 100 DEG C and get the sol of anatase phase titanium dioxide nano-crystal. The crystal size and crystallinity of titanium dioxide in the sol can be controlled by altering the production conditions and dispergation technology of the white sediment. The invention can get the anatase phase titanium dioxide transparent sol which does no contain organic stabilizer and has a crystal size of a plurality of nonameters. Furthermore, the sol has the characteristics of high density, high stability, transparency, etc.

Description

technical field [0001] The invention belongs to the field of preparation of titanium dioxide sol, and in particular relates to a preparation method of anatase phase titanium dioxide sol. Background technique [0002] In recent years, the photocatalytic activity of nano-titanium dioxide has received extensive attention. Applications related to photocatalysis mainly include: degradation of various pollutants in sewage and air, self-cleaning technology, antibacterial materials, anti-fog coatings, and solar energy conversion. [0003] Nano-titanium dioxide refers to titanium dioxide products whose grain size is within 100 nanometers. Using it instead of titanium dioxide micropowder can increase its photon quantum yield. A major problem in its application. Immobilizing titanium dioxide on a variety of supports to prepare a titanium dioxide film can avoid the problem of difficult recovery of nanoparticles in practical applications. In addition, attaching titanium dioxide nanopar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C01G23/047
Inventor 张青红李爽王宏志李耀刚
Owner DONGHUA UNIV
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