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Method for preparing ultrafine powder in nano titanium dioxide structure

A nanostructure, titanium dioxide technology, applied in the direction of chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of long time period, high cost, poor uniformity, etc., achieve short time, low cost, Good uniform effect

Inactive Publication Date: 2015-06-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for overcoming the high cost of the prior art, long time period, and poor uniformity, and to propose a method for preparing titanium dioxide nanostructure ultrafine powder

Method used

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  • Method for preparing ultrafine powder in nano titanium dioxide structure
  • Method for preparing ultrafine powder in nano titanium dioxide structure
  • Method for preparing ultrafine powder in nano titanium dioxide structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Take a certain amount of ultrapure water at normal temperature and pressure and add it to a polytetrafluoroethylene liner with a total volume of 52ml, then add a certain amount of titanium powder, hydrogen peroxide and hydrofluoric acid respectively to obtain a hydrothermally synthesized mixture. Material, the molar ratio of the batching consumption of titanium powder and ultrapure water is 1:7500, the molar concentration of hydrogen peroxide is 1.53mol / L, and the molar ratio of hydrofluoric acid and hydrogen peroxide is 1:14.36;

[0028] 2) Seal the mixture obtained in step 1) in a stainless steel reaction kettle, then place the sealed stainless steel reaction kettle in a digital blast oven, react at 180°C for 6.5h, and then naturally cool to room temperature to obtain a milky white product The suspension was collected, and dried in a drying oven at 80°C for 1 hour to obtain a titanium dioxide polyhedral active precursor;

[0029] 3) Add a certain amount of ultrapur...

Embodiment 2

[0038] 1) Take a certain amount of ultrapure water at normal temperature and pressure and add it to a polytetrafluoroethylene liner with a total volume of 52ml, then add a certain amount of titanium powder, hydrogen peroxide and hydrofluoric acid respectively to obtain a hydrothermally synthesized mixture. Material, the molar ratio of the batching consumption of titanium powder and ultrapure water is 1:7500, the molar concentration of hydrogen peroxide is 1.55mol / L, and the molar ratio of hydrofluoric acid and hydrogen peroxide is 1:14.36;

[0039] 2) Seal the mixture obtained in step 1) in a stainless steel reaction kettle, then place the sealed stainless steel reaction kettle in a digital blast oven, react at 180°C for 6.5h, and then naturally cool to room temperature to obtain a milky white product The suspension was collected, and dried in a 60°C drying oven for 1 hour to obtain a titanium dioxide polyhedral active precursor;

[0040] 3) Add a certain amount of ultrapure w...

Embodiment 3

[0043] 1) Take a certain amount of ultrapure water at normal temperature and pressure and add it to a polytetrafluoroethylene liner with a total volume of 52ml, then add a certain amount of titanium powder, hydrogen peroxide and hydrofluoric acid respectively to obtain a hydrothermally synthesized mixture. Material, the molar ratio of the batching consumption of titanium powder and ultrapure water is 1:7500, the molar concentration of hydrogen peroxide is 1.53mol / L, and the molar ratio of hydrofluoric acid and hydrogen peroxide is 1:14.36;

[0044] 2) Seal the mixture obtained in step 1) in a stainless steel reaction kettle, then place the sealed stainless steel reaction kettle in a digital blast oven, react at 170° C. for 7 hours, and then naturally cool to room temperature to obtain a milky white product. Suspension, collect the product, and dry in an 80°C drying oven for 1 hour to obtain a titanium dioxide polyhedral active precursor;

[0045] 3) Add a certain amount of ult...

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Abstract

The invention relates to a method for preparing ultrafine powder in a nano titanium dioxide structure. The method comprises the following steps: (1) preparing a synthetic mixed material in a polytetrafluoroethylene liner of a reaction kettle at normal temperature and normal pressure, carrying out one-step hydrothermal reaction after sealing to obtain single crystal anatase TiO2 polyhedral active powder with the size being about 300nm, cooling to room temperature and collecting the polyhedral active powder; (2) preparing a processing mixed material in the polytetrafluoroethylene liner of the reaction kettle, and carrying out hydrothermal micro-nano processing on the TiO2 polyhedral active powder through a mixture of hydrofluoric acid and hydrogen peroxide after sealing to obtain the ultrafine powder in annular hollow anatase TiO2 nano structure on which a high-energy active face is exposed. In the hydrothermal reaction system, the hydrofluoric acid plays roles of chemically corroding titanium powder and high-energy surface of titanium dioxide polyhedral powder particles, and hydrogen peroxide plays the role of regulating conveyance of Ti atoms on different surfaces of the polyhedral powder between a liquid and a solid. The mixing use level of hydrofluoric acid and hydrogen peroxide can be used for controlling micro-nano processing of the annular hollow titanium dioxide nano structure.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide powder. Background technique [0002] Since the beginning of the 20th century titanium dioxide (TiO 2 ) powder commercial production, TiO 2 It has been widely used in our daily life, such as dyes, sunscreens, pigments, toothpaste, etc. Since the 1970s, TiO 2 As a photocatalyst, it has been rapidly developed in the fields of energy and environment. TiO 2 The photocatalytic performance mainly depends on its crystal phase, crystallinity, specific surface area, structural morphology and exposed high-energy crystal planes. Since the 1990s, nanostructured TiO 2 Photoanode materials for dye-sensitized solar cells have been developed rapidly. Nanostructured TiO 2 The characteristics of large specific surface area, high surface activity, good thermal conductivity, good light absorption performance and good dispersion determine the nanostructured TiO 2 with many regular TiO 2 Special prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/02
Inventor 莫茂松段中夏王高翔李德法
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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