Method for preparing TiO2 nanocrystal particles

Abstract

The invention discloses a method for preparing TiO2 nanocrystal particles, which comprises the following steps: dispersing titanic acid nanotubes in an oxydol water solution, and carrying out hydrothermal reaction to obtain monodisperse high-photocatalytic-activity anatase TiO2 nanocrystal particles. The process for preparing the titanic acid nanotubes comprises the following steps: mixing a titanium source and a sodium hydroxide water solution, carrying out hydrothermal reaction to obtain sodium titanate nanotubes, and carrying out acid exchange on the sodium titanate nanotubes to obtain the titanic acid nanotubes; or mixing a titanium source and a potassium hydroxide water solution, carrying out hydrothermal reaction to obtain potassium titanate nanotubes, and carrying out acid exchange on the potassium titanate nanotubes to obtain titanic acid nanotubes; or carrying out anode oxidation on metal titanium in a fluorion-containing electrolyte to obtain the titanic acid nanotubes.

Description

technical field

[0001] The invention relates to the field of preparation of functional photocatalyst materials, in particular to a method for preparing TiO 2 Nanocrystalline particle method. Background technique

[0002] Titanium dioxide (TiO 2 ) has attracted extensive attention from industry and scientific research circles due to its rich sources, non-toxicity, and good stability. Recently, anatase TiO 2 Considered as one of the most ideal photocatalytic materials, it is widely used in photocatalytic air purification and photocatalytic water treatment.

[0003] Anatase phase TiO 2 The photocatalytic efficiency of a particle is closely related to its size, shape, degree of dispersion, crystallinity, etc. Generally speaking, a small particle size has a large specific surface area, can absorb more organic matter, and usually shows a higher photocatalytic efficiency; Similarly, the greater the degree of dispersion of particles, the more conducive to the improvement of pho...

Examples

Embodiment 1

[0055] Take 2 grams of titanium oxide powder and disperse it in 80 milliliters of sodium hydroxide solution with a concentration of 10 moles per liter, then transfer the solution to a hydrothermal kettle and keep the temperature at 120 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. When the temperature of the reaction kettle was lowered to room temperature, the hydrothermal kettle was taken out, the supernatant liquid was poured off, and the white sodium titanate nanotube solid at the bottom was transferred to a beaker, ultrasonically dispersed, washed 5 times with 200 ml of deionized water, and centrifuged. The washed sodium titanate nanotubes were obtained. Adding 500 milliliters of nitric acid solution with a concentration of 0.01 mole per liter into the washed sodium titanate nanotubes, ultrasonication and standing for 6 hours, so that the sodium ions in the sodium titanate nanotubes are completely replaced by hydrogen ions in the nitric acid solution, O...

Embodiment 2

[0057] Take 1 gram of titanium oxide powder and disperse it in 80 milliliters of sodium hydroxide solution with a concentration of 12 moles per liter, then transfer the solution to a hydrothermal kettle and keep the temperature at 100 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. When the temperature of the reaction kettle was lowered to room temperature, the hydrothermal kettle was taken out, the supernatant liquid was poured off, and the white sodium titanate nanotube solid at the bottom was transferred to a beaker, ultrasonically dispersed, washed 5 times with 200 ml of deionized water, and centrifuged. The washed sodium titanate nanotubes were obtained. Adding 200 milliliters of nitric acid solution with a concentration of 0.1 mole per liter into the washed sodium titanate nanotubes, ultrasonication and standing for 6 hours, so that the sodium ions in the sodium titanate nanotubes are completely replaced by hydrogen ions in the nitric acid solution, Obt...

Embodiment 3

[0059] Take 5 grams of titanium sulfate and disperse it in 80 milliliters of sodium hydroxide solution with a concentration of 10 moles per liter, then transfer the solution to a hydrothermal kettle and keep the temperature at 120 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. When the temperature of the reaction kettle was lowered to room temperature, the hydrothermal kettle was taken out, the supernatant liquid was poured off, and the white sodium titanate nanotube solid at the bottom was transferred to a beaker, ultrasonically dispersed, washed 5 times with 200 ml of deionized water, and centrifuged. The washed sodium titanate nanotubes were obtained. Adding 500 milliliters of nitric acid solution with a concentration of 0.01 mole per liter into the washed sodium titanate nanotubes, ultrasonication and standing for 6 hours, so that the sodium ions in the sodium titanate nanotubes are completely replaced by hydrogen ions in the nitric acid solution, Obtain...

technical field

[0001] The invention relates to the field of preparation of functional photocatalyst materials, in particular to a method for preparing TiO 2 Nanocrystalline particle method. Background technique

[0002] Titanium dioxide (TiO 2 ) has attracted extensive attention from industry and scientific research circles due to its rich sources, non-toxicity, and good stability. Recently, anatase TiO 2 Considered as one of the most ideal photocatalytic materials, it is widely used in photocatalytic air purification and photocatalytic water treatment.

[0003] Anatase phase TiO 2 The photocatalytic efficiency of a particle is closely related to its size, shape, degree of dispersion, crystallinity, etc. Generally speaking, a small particle size has a large specific surface area, can absorb more organic matter, and usually shows a higher photocatalytic efficiency; Similarly, the greater the degree of dispersion of particles, the more conducive to the improvement of pho...

Examples

Embodiment 1

[0055] Take 2 grams of titanium oxide powder and disperse it in 80 milliliters of sodium hydroxide solution with a concentration of 10 moles per liter, then transfer the solution to a hydrothermal kettle and keep the temperature at 120 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. When the temperature of the reaction kettle was lowered to room temperature, the hydrothermal kettle was taken out, the supernatant liquid was poured off, and the white sodium titanate nanotube solid at the bottom was transferred to a beaker, ultrasonically dispersed, washed 5 times with 200 ml of deionized water, and centrifuged. The washed sodium titanate nanotubes were obtained. Adding 500 milliliters of nitric acid solution with a concentration of 0.01 mole per liter into the washed sodium titanate nanotubes, ultrasonication and standing for 6 hours, so that the sodium ions in the sodium titanate nanotubes are completely replaced by hydrogen ions in the nitric acid solution, O...

Embodiment 2

[0057] Take 1 gram of titanium oxide powder and disperse it in 80 milliliters of sodium hydroxide solution with a concentration of 12 moles per liter, then transfer the solution to a hydrothermal kettle and keep the temperature at 100 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. When the temperature of the reaction kettle was lowered to room temperature, the hydrothermal kettle was taken out, the supernatant liquid was poured off, and the white sodium titanate nanotube solid at the bottom was transferred to a beaker, ultrasonically dispersed, washed 5 times with 200 ml of deionized water, and centrifuged. The washed sodium titanate nanotubes were obtained. Adding 200 milliliters of nitric acid solution with a concentration of 0.1 mole per liter into the washed sodium titanate nanotubes, ultrasonication and standing for 6 hours, so that the sodium ions in the sodium titanate nanotubes are completely replaced by hydrogen ions in the nitric acid solution, Obt...

Embodiment 3

[0059] Take 5 grams of titanium sulfate and disperse it in 80 milliliters of sodium hydroxide solution with a concentration of 10 moles per liter, then transfer the solution to a hydrothermal kettle and keep the temperature at 120 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. When the temperature of the reaction kettle was lowered to room temperature, the hydrothermal kettle was taken out, the supernatant liquid was poured off, and the white sodium titanate nanotube solid at the bottom was transferred to a beaker, ultrasonically dispersed, washed 5 times with 200 ml of deionized water, and centrifuged. The washed sodium titanate nanotubes were obtained. Adding 500 milliliters of nitric acid solution with a concentration of 0.01 mole per liter into the washed sodium titanate nanotubes, ultrasonication and standing for 6 hours, so that the sodium ions in the sodium titanate nanotubes are completely replaced by hydrogen ions in the nitric acid solution, Obtain...

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