A method for controlling the morphology of tio2 nanoparticles obtained by alkaline hydrothermal method by neutralization treatment with nitric acid
A technology of nanoparticle and hydrothermal method, applied in the direction of nanotechnology, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of cumbersome procedures, large energy consumption, complex equipment, etc., and achieve broad application prospects, low price, and method simple effect
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[0020] (1) Preparation of titanate nanotube precursor: According to the mass ratio of 0.03125-0.09375, P25 powder was mixed with a sodium hydroxide solution with a concentration of 10mol / L, and hydrothermally reacted at 150-180°C for 8-24h. After completion, the product was washed with deionized water until neutral, and dried at 70°C to obtain a titanate nanotube precursor;
[0021] (2) Nitric acid neutralization treatment: according to the titanate nanotube precursor and HNO 3 The mass ratio is 5.95-119, the titanate nanotube precursor is placed in HNO 3 Neutralize the solution to get Na + Titanate nanotubes with a content of 0-7.3%;
[0022] (3) TiO 2 Secondary hydrothermal treatment of nanoparticles: put the separated titanate nanotubes under the same temperature conditions for hydrothermal reaction again, and the products are washed, separated and dried to obtain TiO with different shapes. 2 nanoparticles.
Embodiment 1
[0024] Preparation of titanate nanotube precursor: take 1.5g P25 powder, mix it with 60mL 10mol / L NaOH solution, put the mixed solution into 100mL polytetrafluoroethylene lining, and carry out hydrothermal reaction at 180°C After 24 hours, the product was washed with deionized water to neutrality and then dried at 70°C to obtain a titanate nanotube precursor;
[0025] Nitric acid neutralization treatment process: take 0.75g of dried titanate nanotube precursor and place it in 100mL of 0.1 mol / L HNO 3 Mix well in the solution to get Na + 0% titanate nanotubes;
[0026] TiO 2 Secondary hydrothermal reaction of nanoparticles: put the titanate nanotubes neutralized by nitric acid at 180°C for 24 hours, and the obtained product was washed with water and dried to obtain TiO with different morphologies. 2 nanoparticles.
Embodiment 2
[0028] Preparation of titanate nanotube precursor: take 1.5g P25 powder, mix it with 60mL 10mol / L NaOH solution, put the mixed solution into 100mL polytetrafluoroethylene lining, and carry out hydrothermal reaction at 180°C After 24 hours, the product was washed with deionized water to neutrality and then dried at 70°C to obtain a titanate nanotube precursor;
[0029] Nitric acid neutralization treatment process: take 0.75g of dried titanate nanotube precursor and place it in 20mL of 0.1 mol / L HNO 3 Mix well in the solution to get Na + 1.7% titanate nanotubes;
[0030] TiO 2 Secondary hydrothermal reaction of nanoparticles: the titanate nanotubes neutralized by nitric acid were subjected to a hydrothermal reaction at 180°C for 24 hours, and the obtained product was washed with water and dried to obtain TiO with different morphologies. 2 nanoparticles.
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