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Preparation method of nano-TiO2 lyosol

A technology of nano-titanium dioxide and sol, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, air quality improvement, etc., can solve the problems of difficult industrial production, fast hydrolysis speed, high cost, etc., and achieves wide wavelength range, low equipment requirements, low cost effect

Inactive Publication Date: 2011-06-08
DONGGUAN TOMORROW NANO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by this method has high purity and uniform particle size; but the hydrolysis speed is fast, the reaction is difficult to control, the cost is high, the energy consumption is high, and it is difficult to industrialize production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: the preparation steps of nano-titanium dioxide solution sol:

[0031] 1) Reaction: adding titanium tetrachloride or other titanium alkoxides and a catalyst into an organic solvent, adding a crystal form control agent, and heating to 200°C. Keep it for 2 hours to get titanium oxide block gel;

[0032] 2) Drying: put the titanium oxide block gel into a drier to dry;

[0033] 3) Hydrolysis: Put the dried powder into water and add crystal form control agent. Heat to above 50°C and keep for more than 1.5 hours;

[0034] 4) Separation: use a centrifuge to separate the nano-titanium dioxide particles;

[0035] 5) Washing: Soak the separated nano-titanium dioxide particles with an organic solvent, and fully stir, and then separate the nano-titanium dioxide particles with a high-speed centrifuge again; this step can be repeated as many times as required;

[0036] 6) Dispersion: Soak the washed nano-titanium dioxide particles in pure water, and add a dispersio...

Embodiment 2

[0037] Embodiment two: provide a kind of preparation method of nano-titanium dioxide solution sol, comprise the steps:

[0038] 1) Reaction: Add titanium tetrachloride or other titanium alkoxides and a catalyst into an organic solvent, add a crystal form control agent, and heat to 300°C. Hold for 0.5 hours to obtain titanium oxide block gel;

[0039] 2) Drying: put the titanium oxide block gel into a drier to dry;

[0040] 3) Hydrolysis: Put the dried powder into water and add crystal form control agent. Heat to above 50°C and keep for more than 1.5 hours;

[0041] 4) Separation: use a centrifuge to separate the nano-titanium dioxide particles;

[0042] 5) Washing: Soak the separated nano-titanium dioxide particles with an organic solvent, and fully stir, and then separate the nano-titanium dioxide particles with a high-speed centrifuge again; this step can be repeated as many times as required;

[0043] 6) Dispersion: Soak the washed nano-titanium dioxide particles in pur...

Embodiment 3

[0044] Embodiment three: provide a kind of preparation method of nano-titanium dioxide solution sol, comprise the steps:

[0045] 1) Reaction: adding titanium tetrachloride or other titanium alkoxides and a catalyst into an organic solvent, adding a crystal form control agent, and heating to 50°C. Keep it for 5 hours to get titanium oxide block gel;

[0046] 2) Drying: put the titanium oxide block gel into a drier to dry;

[0047] 3) Hydrolysis: Put the dried powder into water and add crystal form control agent. Heat to above 50°C and keep for more than 1.5 hours;

[0048] 4) Separation: use a centrifuge to separate the nano-titanium dioxide particles;

[0049] 5) Washing: Soak the separated nano-titanium dioxide particles with an organic solvent, and fully stir, and then separate the nano-titanium dioxide particles with a high-speed centrifuge again; this step can be repeated as many times as required;

[0050] 6) Dispersion: Soak the washed nano-titanium dioxide particle...

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PUM

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Abstract

The invention discloses a preparation method of nano-TiO2 lyosol. The method comprises the following steps: adding titanium tetrachloride or another titanium alkoxide and catalyst in organic solvent, adding crystalline control agent, heating to 50 DEG C, keeping for 5 hours to obtain titanium oxide massive gel; drying the titanium oxide massive gel in a dryer; placing the dried powder in water, adding crystalline control agent; heating to more than 50 DEG C, keeping for more than 1.5; using a centrifugal machine to separate out nano-TiO2 particles; soaking the separated nano-TiO2 particles in organic solvent, fully stirring, then using a high speed centrifuge to separate out nano-TiO2 particles, wherein the step can be repeated several times according to need; and soaking the rinsed nano-TiO2 particles in purified water, and adding dispersion stabilizer. The prepared nano-TiO2 lyosol can be used to purify the air and degrade and eliminate all the organic pollutants and partial inorganic pollutants in the air; and the nano-TiO2 lyosol also has the function of killing bacteria, namely the lyosol can kill Escherichia coli.

Description

technical field [0001] The invention relates to a preparation method of nano titanium dioxide solution sol. Background technique [0002] In the prior art, the preparation method of nano-titanium dioxide solution sol usually adopts the following method. [0003] 1. Gas phase hydrolysis method [0004] The gas-phase hydrolysis method uses nitrogen, oxygen or air as the carrier gas, and introduces TiCl4 or titanium alkoxide vapor and water vapor into the reactor respectively for instantaneous mixing and rapid hydrolysis reaction. The crystal form and particle size of nano-TiO2 can be adjusted by changing the residence time, concentration, flow rate and reaction temperature of various gases. [0005] 2. Liquid phase method [0006] The sol-gel method uses titanium alkoxide Ti(OR)4 as a raw material, which is gradually gelled through hydrolysis and polycondensation, and then dried at low temperature and sintered to obtain nano-TiO2 particles. The product obtained by this met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCY02A50/20
Inventor 梁斓
Owner DONGGUAN TOMORROW NANO SCI & TECH