Controllable nanocrystalline tio2 particle and its preparation method and application
A crystalline and particle technology, applied in nanotechnology, nanotechnology, sustainable manufacturing/processing, etc., can solve the problems of high production cost, low production efficiency, and inability to prepare nanocrystalline TiO2 particles as desired.
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[0047] A controllable nanocrystalline TiO 2 The preparation method of particle, comprises the following steps:
[0048] a. Add tetraisopropyl titanate into the acidic solution, then stir and react under pressure to prepare titanium sol;
[0049] b. The titanium sol is subjected to a hydrothermal reaction;
[0050] c. After the hydrothermal reaction, remove the liquid phase, wash until neutral, and dry to obtain nanocrystalline TiO 2 particles.
[0051] The above-mentioned controllable nanocrystalline TiO 2 In step a of the particle preparation method, in order to reduce the speed of the hydrolysis reaction and thereby control the consistency of product particle size distribution, particle size and other factors, the stirring reaction temperature is preferably 0-4°C.
[0052] The above-mentioned controllable nanocrystalline TiO 2 In step a of the particle preparation method, in order to reduce the hydrolysis rate of tetraisopropyl titanate, the tetraisopropyl titanate is d...
Embodiment 1
[0072] Nanocrystalline TiO 2Preparation of granules: Weigh 2.27g of tetraisopropyl titanate as solvent A, add 2mL of concentrated nitric acid to 76mL of deionized water and mix evenly to form solution B, place solution B in an ice-water bath, and dissolve solvent A at 0.5 mL / min Add dropwise to Solution B and stir vigorously for 2 hours to form a sol, transfer the sol to a p-polyphenol-lined hydrothermal kettle and heat it to 140°C at a heating rate of 1°C / min, keep it warm for 6h and take it out Naturally cool the hydrothermal kettle to room temperature, skim the supernatant in the lining, wash with deionized water under ultrasonic conditions, and then centrifuge to remove organic matter and excess acid, repeat the washing several times until the pH value is 7.0, use absolute ethanol Most of the water was exchanged, transferred to a rotary evaporator to quickly remove most of the water and ethanol, and finally placed in a vacuum drying oven at 90°C for 2 hours and then taken ...
Embodiment 2
[0080] Nanocrystalline TiO 2 Preparation of particles: Weigh 2.27g of tetraisopropyl titanate as solvent A, add 10mL of concentrated nitric acid to 68mL of deionized water and mix evenly to form solution B, place solution B in an ice-water bath, and dissolve solvent A at 0.5 Add mL / min dropwise to solution B and stir vigorously for 2 hours to form a sol. Transfer the sol to a p-polyphenol-lined hydrothermal kettle and heat it to 140°C at a heating rate of 1°C / min. Take it out after holding for 6 hours. Naturally cool the hydrothermal kettle to room temperature, skim the supernatant in the lining, wash with deionized water under ultrasonic conditions, and then centrifuge to remove organic matter and excess acid, repeat the washing several times until the pH value is 7.0, use absolute ethanol Most of the water was exchanged, transferred to a rotary evaporator to quickly remove most of the water and ethanol, and finally placed in a vacuum drying oven at 90°C for 2 hours and then ...
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