Method for preparing anatase-phase titanium dioxide sol

A titanium dioxide, anatase phase technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., to achieve the effect of wide range of materials, low cost and good application prospects

Inactive Publication Date: 2011-01-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also patent reports that adding boric acid as a complexing agent to the ammonium fluorotitanate solution to impregnate glass wool and other materials can obtain a crystalline titanium dioxide film, but this process will form a white

Method used

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  • Method for preparing anatase-phase titanium dioxide sol
  • Method for preparing anatase-phase titanium dioxide sol
  • Method for preparing anatase-phase titanium dioxide sol

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Heat 100 mL of titanium sulfate solution with a concentration of 1 mol / L to 70°C and keep it warm, add 200 mL of 2 mol / L sodium hydroxide solution dropwise, and keep warm for 2 hours after the dropwise addition to obtain a white precipitate. After the heat preservation was completed, it was naturally cooled to room temperature, the product was poured out, and washed repeatedly with deionized water to obtain a gel-like solid. Weigh 80 grams of the above solid (equivalent to 8 grams of titanium dioxide) and disperse it in 100 mL of trifluoroacetic acid with a concentration of 1 mol / L. The temperature is kept at 20 ° C, accompanied by stirring and ultrasonic dispersion, and kept for 12 hours to obtain transparency. better sol. Take 50ml of the above sol, pour it into a hydrothermal kettle with a volume of 80ml for hydrothermal reaction, raise the temperature to 200°C and keep it warm for 24 hours, centrifuge the obtained gelatinous white precipitate, then disperse it in di...

Embodiment 2

[0037] Heat 200mL of titanium tetrachloride solution with a concentration of 2mol / L to 50°C and keep it warm, add 300mL of ammonia water with a concentration of 3mol / L dropwise, and continue to keep warm and hydrolyze for 24 hours after the dropwise addition to obtain a white precipitate. At the end of the heat preservation, it was naturally cooled to room temperature, the product was poured out, and washed repeatedly with deionized water to obtain a gel-like solid. Weigh 60 grams of the above solid (equivalent to 9 grams of titanium dioxide) and place it in a beaker, then measure 75 mL of trichloroacetic acid with a concentration of 0.5 mol / L and 75 mL of trifluoroacetic acid with a concentration of 1.5 mol / L, and mix the two acid solutions Add it into the above beaker containing the gel solid, keep the temperature at 5°C, stir, ultrasonically disperse, and keep for 24 hours to obtain a transparent sol. Dilute the obtained sol 5 times with distilled water (volume ratio), take...

Embodiment 3

[0040] After heating 400 mL of 0.25 mol / L titanium sulfate solution to 90°C, 400 mL of 1 mol / L ammonia solution was added dropwise to the solution, and hydrolyzed at 90°C for 12 hours to obtain a white precipitate. At the end of the heat preservation, it was naturally cooled to room temperature, the product was poured out, and washed repeatedly with deionized water to obtain a gel-like solid. Weigh 100 grams of the above solid (equivalent to 12 grams of titanium dioxide) and disperse it in a mixed solution of 50 mL of acetic acid with a concentration of 0.75 mol / L and 50 mL of trifluoroacetic acid with a concentration of 1.25 mol / L. , Ultrasonic dispersion, and keep for 4 hours to obtain a transparent sol. After diluting the obtained sol 10 times with distilled water, take 50ml and pour it into a hydrothermal kettle with a volume of 80ml for hydrothermal reaction, raise the temperature to 120°C and keep it warm for 4 hours, centrifuge the obtained white precipitate, then dispe...

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Abstract

The invention relates to a method for preparing anatase-phase titanium dioxide sol. The method comprises the following steps: preparing a titanium-containing inorganic substance into aqueous solution; heating the aqueous solution to 40 to 100 DEG C; dripping inorganic base solution to be taken as precipitant and keeping the temperature for 2 to 24h to obtain white titanium dioxide hydrated precipitate; washing the precipitate with deionized water to obtain gelatinous hydrated titanium dioxide; adding two-carbon organic acid solution, stirring, performing ultrasonic dispersion for 2 to 48h and peptizing; and performing hydrothermal treatment on the obtained sol for 1 to 24h in a hydrothermal kettle at the temperature of 100 to 200 DEG C, wherein the crystallinity and crystallite dimension of the titanium dioxide in the sol can be regulated. The preparation method has the advantages of simplicity, low cost, wide raw material resources and good application prospects and is suitable for industrial production; moreover, the crystallite dimension of the prepared titanium dioxide sol is the dimension of a few of nanometers, therefore the problem of fast growth of crystallites caused by phase change in the high-temperature calcination and crystallization of amorphous titanium dioxide sol is solved.

Description

technical field [0001] The invention belongs to the field of preparation of titanium dioxide sol, in particular to a preparation method of anatase phase titanium dioxide sol. Background technique [0002] In the past few decades, a lot of research and exploration have been carried out around the conversion and storage of solar energy, photochemical synthesis, and photocatalytic decomposition. Especially in the aspect of photocatalytic decomposition, because titanium dioxide has the advantages of high catalytic activity, strong oxidation ability, reusable use, and no secondary pollution, the photocatalytic decomposition of pollutants by titanium dioxide has become one of the most promising environmental treatment technologies. However, in the process of sewage treatment, how to separate and recover titanium dioxide from the sewage that has been treated by photocatalysis has always been a major problem in its application. This problem can be solved by attaching titanium dioxi...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 张青红袁素珺王宏志李耀刚
Owner DONGHUA UNIV
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