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Nanometer titanium dioxide preparation method

A technology of nano-titanium dioxide and ammonium fluorotitanate, applied in the field of nano-materials, can solve problems such as the toxicity of chromium ions

Active Publication Date: 2015-09-16
杭州爱净科技有限公司
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  • Application Information

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Problems solved by technology

Relevant reports have shown that non-compensatory anion and cation (combination of chromium and nitrogen) co-doping is very beneficial to the narrowing of the band gap of wide bandgap semiconductors such as titanium dioxide. Nitrogen-doped samples, but the toxic characteristics of chromium ions limit its application

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[0019] The embodiment of the present invention discloses a preparation method of nano-titanium dioxide, comprising the following steps: mixing 20-50 parts by weight of absolute ethanol and 30-50 parts by weight of deionized water, adding boric acid and silver nitrate in sequence, and adding titanium fluoride after stirring ammonium acid, adjust the pH value between 2 and 4, and obtain the first solution after stirring; add a mixed solution of 20 to 30 parts by weight of butyl titanate and 30 to 70 parts by weight of absolute ethanol into the first solution, The second solution is obtained after stirring; add 4-12 parts by weight of titanate coupling agent and 2-5 parts by weight of polystyrene to the second solution, stir after ultrasonic dispersion, heat to 70-90°C, and continue stirring reaction and centrifugation to obtain nanometer titanium dioxide.

[0020] In the above technical scheme, the chemical formula of the ammonium fluorotitanate is (NH 4 ) 2 TiF 6 , the co-do...

Embodiment 1

[0045] 1): Mix 50 parts of absolute ethanol and 40 parts of deionized water in parts by mass at room temperature. Add boric acid to make the concentration in the above solution about 0.3mol / L, add silver nitrate solution to make the concentration of silver nitrate in the above solution about 0.3mol / L, and stir for 3min.

[0046] 2): Add ammonium fluotitanate to the above mixed solution so that the concentration in the above solution is about 0.2mol / L, and adjust the pH between 2-4, and continue to stir for 15 minutes. This mixed solution is recorded as the first solution.

[0047] 3): Prepare mixed solution B, which is a mixed solution of 20 parts of butyl titanate and 40 parts of absolute ethanol. Add the mixed solution B into the first solution, control the addition rate to 1 mL / min, and stir for 1 h to obtain the second solution.

[0048] 4): Add 8 parts of titanate coupling agent and 4 parts of polystyrene to the second solution, ultrasonically disperse for 20 minutes, s...

Embodiment 2

[0052] 1): Mix 45 parts of absolute ethanol and 35 parts of deionized water in parts by mass at room temperature. Add boric acid so that its concentration in the above solution is about 0.35mol / L, add silver nitrate solution so that the concentration of silver nitrate in the above solution is about 0.2mol / L, and stir for 2 minutes.

[0053] 2): Add ammonium fluotitanate to the above mixed solution so that the concentration in the above solution is about 0.15mol / L, and adjust the pH between 2-4, and continue to stir for 20min. This mixed solution is recorded as the first solution.

[0054] 3): Prepare mixed solution B, which is a mixed solution of 30 parts of butyl titanate and 60 parts of absolute ethanol. Add the mixed solution B into the first solution, control the addition rate to 1.5 mL / min, stir for 1.5 h, and obtain the second solution.

[0055] 4): Add 4-12 parts of titanate coupling agent and 2-5 parts of polystyrene to the second solution, sonicate for 30 minutes, s...

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Abstract

The invention provides a nanometer titanium dioxide preparation method. Ammonium hexafluorotitanate doped with the following nonmetal elements: N, F and B enhances the photocatalysis effect of nanometer titanium dioxide under the action of boric acid; a silver nitrate solution added in the invention is doped with the metal element Ag, and the metal element Ag and the nonmetal elements are co-doped to generate synergism, so the catalysis activity of nanometer titanium dioxide is greatly improved. Butyl titanate is hydrolyzed to generate a nanometer titanium dioxide sol, and a titanate coupling agent and polystyrene are directly used to modify the nanometer titanium dioxide sol, so the method has the advantages of simple process and mild reaction conditions; and the nanometer titanium dioxide modified by the titanate coupling agent and polystyrene has good thermal stability and dispersibility.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a preparation method of nanometer titanium dioxide. Background technique [0002] In 1972, Fujishima and Honda reported for the first time in the British journal (Nature) the phenomenon that titanium dioxide electrodes decompose water to generate hydrogen under ultraviolet light. Since then, titanium dioxide has been used in this research and has shown excellent photocatalysis. Since the photocatalytic process itself involves the storage and conversion of light energy, it has great application potential in the fields of energy and environment. For example, photocatalytic hydrogen production is the use of photochemical processes triggered by solar energy to decompose water to produce hydrogen, and hydrogen energy is an efficient and clean energy source; another example is the use of photocatalytic reactions to purify and repair gas or liquid environments, including ino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/06C02F1/32B01J21/06
Inventor 石峰张寒洁
Owner 杭州爱净科技有限公司
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