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Method for preparing silver and titanic oxide nano compound material at low temperature

A nano-composite material, titanium dioxide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., to achieve simple preparation methods and excellent photocatalysis effects

Inactive Publication Date: 2009-04-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperature heat treatment limits Ag / TiO 2 Applications of composite materials in environments and substrates that cannot undergo high temperature heat treatment

Method used

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  • Method for preparing silver and titanic oxide nano compound material at low temperature
  • Method for preparing silver and titanic oxide nano compound material at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Dissolving butyl titanate in ethanol, the molar ratio of butyl titanate to ethanol is 1:6, to obtain liquid A;

[0018] 2) Drop A solution into water, the molar ratio of water to butyl titanate is 40, adjust the pH value of the solution to 3 with nitric acid, stir until a stable sol is formed, and obtain B solution;

[0019] 3) dissolving silver nitrate and an equivalent amount of diethanolamine in ethanol to obtain liquid C, the molar ratio of ethanol to silver nitrate is 12, and the molar ratio of silver nitrate to butyl titanate is 0.1;

[0020] 4) Mix liquid C and liquid B, dry at 50°C after aging, and obtain silver and titanium dioxide nanocomposite material.

[0021] The X-ray diffraction patterns of the prepared silver and titanium dioxide nanocomposites are as follows: figure 1 As shown, titanium dioxide is composed of anatase and brookite, and silver exists as zero-valent silver with a face-centered cubic structure. The transmission electron micrographs of...

Embodiment 2

[0023] 1) Dissolving isopropyl titanate in ethylene glycol, the molar ratio of isopropyl titanate to ethylene glycol is 1:5, to obtain liquid A;

[0024] 2) Drop A liquid into water drop by drop, the molar ratio of water to isopropyl titanate is 100, adjust the pH value of the solution to 2 with nitric acid, stir until a stable sol is formed, and obtain B liquid;

[0025] 3) Silver nitrate and diethanolamine are dissolved in ethylene glycol at a molar ratio of 1:4 to obtain liquid C. The molar ratio of ethylene glycol to silver nitrate is 10, and the molar ratio of silver nitrate to isopropyl titanate is 0.001;

[0026] 4) Mix liquid C and liquid B, dry at 100° C. after aging, and obtain a nanocomposite material of silver and titanium dioxide.

[0027] The obtained titanium dioxide crystals have a size of about 6 nanometers, and the silver particles have a size of 4-10 nanometers.

Embodiment 3

[0029] 1) Dissolving titanium chloride in propanol, the molar ratio of titanium chloride and propanol is 1:10, to obtain liquid A;

[0030] 2) Drop A liquid into water drop by drop, the molar ratio of water to titanium chloride is 200, adjust the pH value of the solution to 4 with hydrochloric acid, stir until a stable sol is formed, and obtain B liquid;

[0031] 3) Dissolve silver chloride and diethanolamine in propanol at a molar ratio of 1:8 to obtain liquid C. The molar ratio of propanol to silver chloride is 20, and the molar ratio of silver chloride to titanium chloride is 0.3 ;

[0032] 4) Mix liquid C and liquid B, dry at 150°C after aging, and obtain silver and titanium dioxide nanocomposite material.

[0033] The obtained titanium dioxide crystals have a size of about 4 nanometers, and the silver particles have a size of 15-40 nanometers.

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Abstract

The invention discloses a method for preparing a silver and titanium dioxide nano-composite at low temperature. The method comprises the following steps: (1) a titanium compound is dissolved in an organic solvent, so as to obtain an A solution; (2) the A solution is dripped into water gradually and stirred to form stable sol, so as to obtain a B solution; (3) a silver compound and diethanolameine are dissolved in the organic solvent, so as to obtain a C solution; and (4) the C solution and the B solution are mixed, aged and dried. The method has the advantages that the method is simple, needs no special device or high temperature condition, and can obtain the silver and titanium dioxide nano-composite at low temperature. In the prepared silver and titanium dioxide nano-composite, the size of silver particles is between 5 and 40 nanometers, and the size of titanium dioxide particles is between 4 and 6 nanometers. The composite has excellent properties in photocatalysis, deodorization and sterilization.

Description

technical field [0001] The invention relates to a method for preparing silver and titanium dioxide nanocomposite materials at low temperature. Background technique [0002] Metal oxide semiconductor titanium dioxide (TiO 2 ) is a wide bandgap semiconductor material with a bandgap width of about 3.2-3.41eV, transparent in the wavelength range of 0.35-12μm, high refractive index, and has the characteristics of high mechanical properties and stable chemical properties. TiO in the UV band 2 With photocatalytic properties, in many photocatalysts (TiO 2 , ZnO, Fe 2 o 3 , CdS, etc.), TiO 2 It is valued by people because of its non-toxic, high catalytic activity, good stability, cheap and easy to get. Metal energy and TiO 2 To constitute a composite photocatalyst, metal on metal / TiO 2 The role of the composite material is to facilitate the separation of photogenerated electrons and holes and reduce the overvoltage of the reduction reaction (reduction of protons, reduction of...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J21/06
Inventor 赵高凌李红韩高荣
Owner ZHEJIANG UNIV
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