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Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method

A nano-titanium dioxide, nano-particle technology, applied in chemical instruments and methods, catalyst activation/preparation, catalyst protection and other directions, can solve the problems of reduced nano-particle activity, reduced particle catalytic activity, low efficiency of decomposing organic matter, etc., to expand the application field , the effect of protecting the environment

Inactive Publication Date: 2007-05-30
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research results show that although this method can protect the organic carrier, since silicon dioxide is an insulator, the photoinduced electrons or positive holes cannot reach the surface of the mixed particles, which will greatly reduce the catalytic activity of the particles and lead to decomposition. organic matter inefficiency
[0006] In addition, in the practical application of nanoparticles, although there is not enough medical evidence, people have reason to worry about whether nano-scale substances, which are smaller than dust, will cause diseases such as silicosis when inhaled or contacted with the human body intentionally or unintentionally
Studies have shown that the harm of dust can be reduced by agglomerating nanoparticles and increasing the self-weight of nanoparticles, but the general agglomeration method will inevitably reduce the activity of nanoparticles

Method used

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  • Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method
  • Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method
  • Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, as shown in Figure 7:

[0041] (a) pretreatment of titanium dioxide nanoparticles,

[0042] Add 100 mg of titanium dioxide nanoparticles into a NaOH solution with a concentration of 0.5 mol / L, and magnetically stir at a speed of 500 rpm for 7 hours, then wash with water three times and centrifuge until the pH is 7 for use.

[0043] (b) carbon coated on the surface of nanoparticles,

[0044]Add 100 mg of nanoparticles prepared in step (a) into polyvinyl alcohol resin (PVA) in an aqueous solution of carbon-containing organic matter soluble in water at a concentration of 0.7 mol / L. After thorough mixing, the mixed solution was introduced into a hydrothermal reaction kettle, and heat-treated at 150° C. for 2 hours. After the reaction, it was washed three times with methanol, an organic solvent, and three times with distilled water, and then dried for use.

[0045] (c) the outer layer of carbon-coated nanoparticles coated with silica,

[0046] (1) Stir 100 ...

Embodiment 2

[0052] Embodiment 2, as shown in Figure 7:

[0053] (a) pretreatment of titanium dioxide nanoparticles,

[0054] Add 500 mg of titanium dioxide nanoparticles into the HCL solution with a concentration of 1.2 mol / L, and magnetically stir at 1000 rpm for 14 hours, then wash with water five times and centrifuge until the pH is 7 for use.

[0055] (b) carbon coated on the surface of nanoparticles,

[0056] Add 450 mg of nanoparticles prepared in step (a) into polyethylene glycol (PEG) in an aqueous solution of carbon-containing organic matter soluble in water at a concentration of 2.2 mol / L. After thorough mixing, the mixed solution was introduced into a hydrothermal reaction kettle, and heat-treated at 200° C. for 8 hours. After the reaction, wash with organic solvent ethanol for 7 times, wash with distilled water for 7 times, and then dry for use.

[0057] (c) the outer layer of carbon-coated nanoparticles coated with silica,

[0058] (1) Stir 450 mg of the sample obtained i...

Embodiment 3

[0064] Embodiment 3, as shown in Figure 7:

[0065] (a) pretreatment of titanium dioxide nanoparticles,

[0066] Add 300 mg of titanium dioxide nanoparticles into NaOH solution with a concentration of 0.8 mol / L, magnetically stir at 750 rpm for 10 hours, wash with water four times and centrifuge until the pH is 7 for use.

[0067] (b) carbon coated on the surface of nanoparticles,

[0068] Add 275 mg of nanoparticles prepared in step (a) into 1.4 mol / L aqueous solution of soluble carbon-containing organic matter sucrose (Sucrose). After thorough mixing, the mixed solution was introduced into a hydrothermal reaction kettle, and heat-treated at 175° C. for 5 hours. After the reaction, it was washed 5 times with the organic solvent acetone, and then 5 times with distilled water, and then dried for use.

[0069] (c) the outer layer of carbon-coated nanoparticles coated with silica,

[0070] (1) Stir 275 mg of the sample obtained in step (b), 10 ml of chloroform, 450 μl of ultr...

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Abstract

It relates to a none directly agglomerated scattered fixing nanometer Titania particles. It aims to protect the basic material, solve the contradiction of protecting organic carrier and retaining certain photo catalytic activation to solve the conflict of reducing catalytic activity as well as reducing power damage. It comprises the pretreatment of Titania nanometer particles, coating carbon around the surface of the nanometer particles, coating silica dioxide outside the carbon coated nanometer particles through sol and gel, and getting rid of the sandwiched carbon coating. It can be used for purifying air, water, antibacterial, self cleaning and many other areas.

Description

technical field [0001] The invention relates to a method for preparing non-directly agglomerated dispersed and fixed nano titanium dioxide particles. Nano-titanium dioxide particles can be used to decompose most organic substances, such as air purification, water purification, antibacterial sterilization, self-cleaning and other fields closely related to people's lives. Background technique [0002] The broad definition of nanoparticles refers to a class of particles whose particle size reaches the nanoscale. Its narrow definition refers to a class of particles that exhibit different physical and chemical properties from general aggregates after the particle size reaches the nanoscale. [0003] For example, nano-titanium dioxide particles have attracted worldwide attention due to their strong photocatalytic effect. Since the particles are excited by ultraviolet light, the electrons and positive holes are separated, so they have a strong redox ability. This redox ability i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/02B01J21/06B01J33/00A61L9/22C02F1/30
Inventor 王晟王騊陈文兴
Owner ZHEJIANG SCI-TECH UNIV
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