Preparation method of monodispersed ultra-small-grain-size titanium dioxide nanocrystals
A titanium dioxide, monodisperse technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of non-environmental protection, low activity, high energy consumption of the preparation process, etc., and achieve low equipment requirements, high activity, and simple process Effect
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[0022] A method for preparing monodisperse ultra-small particle size titanium dioxide nanocrystals, the method comprising the following steps:
[0023] (1) Dissolve tetrabutyl titanate in absolute ethanol, stir magnetically, slowly drop in appropriate amount of deionized water, centrifuge and wash to obtain a white product after the hydrolysis reaction is completed;
[0024] (2) Disperse the product obtained in step (1) in absolute ethanol, add triethanolamine, magnetically stir and heat to boiling to obtain a colorless and clear solution;
[0025] (3) The clarified solution obtained in step (1) is mixed with deionized water and ammonia water, placed in a reaction kettle for heating and reacting, cooled, centrifuged, and washed to obtain a titanium dioxide nanocrystalline material.
[0026] The volume ratio between tetrabutyl titanate in the step (1), deionized water, and triethanolamine in the step (2) is 1:8-20:20-40.
[0027] The hydrolysis reaction temperature in the step...
Embodiment 1
[0032] (1) Slowly drop 0.30 mL tetrabutyl titanate into 60 mL absolute ethanol, stir magnetically at room temperature for 10 min, then slowly drop 10 mL deionized water into the above solution, stir magnetically at room temperature for 20 min, and hydrolyze the reaction The final mixed solution was centrifuged, washed 3 times with deionized water and absolute ethanol successively to obtain a white product;
[0033] (2) Disperse the white product obtained in step (1) into 40 mL of absolute ethanol, stir it magnetically, then add 10 mL of triethanolamine, and heat to boiling for 60 min to obtain a colorless and clear solution;
[0034] (3) Take 5 mL of the clarified solution obtained in step (2), mix it with 20 mL of deionized water and 8 mL of concentrated ammonia water, stir well, pour it into a 50 mL reaction kettle, and place the reaction kettle in an electric drying oven to keep warm at 180°C After 24 h, the reactor was taken out and cooled to room temperature, and the resu...
Embodiment 2
[0036] (1) Slowly drop 0.30 mL tetrabutyl titanate into 60 mL absolute ethanol, stir magnetically at room temperature for 10 min, then slowly drop 10 mL deionized water into the above solution, stir magnetically at room temperature for 20 min, and hydrolyze the reaction The final mixed solution was centrifuged, washed 3 times with deionized water and absolute ethanol successively to obtain a white product;
[0037] (2) Disperse the white product obtained in step (1) into 40 mL of absolute ethanol, stir it magnetically, then add 10 mL of triethanolamine, and heat to boiling for 60 min to obtain a colorless and clear solution;
[0038] (3) Take 5 mL of the clarified solution obtained in step (2), mix it with 23 mL of deionized water and 5 mL of concentrated ammonia water, stir well, pour it into a 50 mL reaction kettle, and place the reaction kettle in an electric drying oven at 180°C to keep warm After 20 h, the reactor was taken out and cooled to room temperature, and the resu...
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