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Method for preparing tungsten trioxide/titanium dioxide nanocomposite with core-shell structure

A nano-composite material, titanium dioxide technology, applied in the field of photocatalysis, can solve the problems of difficult to meet practical application requirements, harsh conditions, complex preparation methods, etc., and achieve the effects of broad practical application value, optimized performance, and simple process.

Inactive Publication Date: 2013-07-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there have been some reports on tungsten trioxide / titanium dioxide composite materials, but few of them involve the design of the core-shell structure of the material, and the preparation method is complicated, the conditions are harsh, the cost is high, and the obtained composite material powder is easy to agglomerate. Difficult to meet the requirements of practical application

Method used

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  • Method for preparing tungsten trioxide/titanium dioxide nanocomposite with core-shell structure
  • Method for preparing tungsten trioxide/titanium dioxide nanocomposite with core-shell structure
  • Method for preparing tungsten trioxide/titanium dioxide nanocomposite with core-shell structure

Examples

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Effect test

Embodiment 1

[0015] 1) Transfer 48 ml of glucose aqueous solution with a concentration of 0.1 mol / L to a closed container, hydrothermally react at a temperature of 200 °C for 20 h, filter and separate after cooling, wash the filtrate three times with ethanol and deionized water, and place in Dry at 60 °C for 6 h to obtain carbon microspheres.

[0016] 2) Disperse the carbon microspheres (100 mg) prepared in step 1) in 4 ml of ethanol mixed solution of titanium tetrachloride and tungsten hexachloride, wherein the concentration of titanium tetrachloride is 0.1 mol / L, hexachloride The concentration of tungsten chloride was 0.01 mol / L. After soaking for 36 h, the filtrate was separated by filtration, washed with ethanol three times, and then dried at 60 °C for 6 h to obtain carbon microspheres adsorbed with titanium ions and tungsten ions.

[0017] 3) Put the carbon microspheres adsorbed with titanium ions and tungsten ions prepared in step 2) into the calcination furnace, and heat up to 350 ℃...

Embodiment 2

[0020] 1) Transfer 48 ml of glucose aqueous solution with a concentration of 0.5 mol / L to a closed container, hydrothermally react at a temperature of 180 °C for 10 h, cool to room temperature and filter and separate, wash the filtrate three times with ethanol and deionized water respectively, and Dry at 60 °C for 6 h to obtain carbon microspheres.

[0021] 2) Disperse the carbon microspheres (400 mg) prepared in step 1) in 16 ml of ethanol mixed solution of titanium tetrachloride and tungsten hexachloride, wherein the concentration of titanium tetrachloride is 1.0 mol / L, hexachloride The concentration of tungsten chloride was 0.04 mol / L. After soaking for 24 h, the filtrate was separated by filtration, washed with ethanol three times, and then dried at 60 °C for 6 h to obtain carbon microspheres adsorbed with titanium ions and tungsten ions.

[0022] 3) Put the carbon microspheres adsorbed with titanium ions and tungsten ions prepared in step 2) into the calcination furnace, ...

Embodiment 3

[0024] 1) Transfer 48 ml of glucose aqueous solution with a concentration of 2.0 mol / L to a closed container, hydrothermally react at a temperature of 160 °C for 1 h, filter and separate after cooling, wash the filtrate three times with ethanol and deionized water, and place in Dry at 60 °C for 6 h to obtain carbon microspheres.

[0025] 2) Disperse the carbon microspheres (200 mg) prepared in step 1) in 6 ml of a mixed solution of titanium tetrachloride and tungsten hexachloride ethanol, in which the concentration of titanium tetrachloride is 2.0 mol / L, and the concentration of hexachloride The concentration of tungsten was 0.20 mol / L. After soaking for 3 h, the filtrate was separated by filtration, washed with ethanol three times, and then dried at 60 °C for 6 h to obtain carbon microspheres adsorbed with titanium ions and tungsten ions.

[0026] 3) Put the carbon microspheres adsorbed with titanium ions and tungsten ions prepared in step 2) into the calcination furnace, and...

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Abstract

The invention discloses a method for preparing tungsten trioxide / titanium dioxide nanocomposite with a core-shell structure. The method comprises the following processes of: transferring a dextrose water solution to a sealed container, obtaining carbon microspheres by hydrothermal reaction, then dispersing and soaking the carbon microspheres into an ethanol mixed solution of titanium tetrachloride and tungsten hexachloride, separating, cleaning and drying to obtain the carbon microspheres of absorbing titanium ions and tungsten ions, and finally burning the carbon microspheres to obtain the tungsten trioxide / titanium dioxide nanocomposite with the core-shell structure. The method is simple in process, low in synthesis cost, free of poison, and easy for realization of industrial large-scale production; and the obtained tungsten trioxide / titanium dioxide nanocomposite with the core-shell structure is uniform in size and good in dispersibility, and has wide practical application value in the aspect of preparation of a photoelectric material or a photocatalytic material.

Description

technical field [0001] The invention relates to a preparation method of a tungsten trioxide / titanium dioxide core-shell structure nanocomposite material, belonging to the technical field of photocatalysis. Background technique [0002] As a traditional semiconductor, titanium dioxide has broad application prospects in the fields of photocatalysis, solar cells, and lithium batteries due to its strong oxidizing ability, stable chemical properties, and low price. However, the forbidden band width of titanium dioxide is relatively large (3.0~3.2 eV), and it can only absorb and utilize ultraviolet light with a wavelength less than 400 nm, and the recombination rate of photogenerated electrons and holes is relatively high, which significantly reduces the photoelectric conversion efficiency. This limits the further application of titanium dioxide in photoelectricity, especially photocatalysis. At present, the main way to reduce the recombination rate of photogenerated carriers of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B82Y40/00
Inventor 何芳刘贵高黄远李立军李凤娇陈利霞
Owner TIANJIN UNIV
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