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Prepn process of nanometer mesoporous TiO2 powder

A titanium dioxide and nano-mesoporous technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high production cost, long preparation cycle, and difficulty in industrialized production, and achieve good stability and low production cost.

Inactive Publication Date: 2005-07-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high production cost and long preparation cycle of this method, it is difficult to realize industrial production, so there has been no report on the industrial production of nano-mesoporous titanium dioxide so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation method of nano mesoporous titanium dioxide powder adopts precipitation method, using titanyl sulfate and sodium hydroxide as raw materials, water as solvent, and adding surfactant, and the following process steps are used to obtain a pore size of 2-15nm and a particle size of 8-15nm , specific surface area 80 ~ 150m 2 / g of anatase nanometer mesoporous titanium dioxide powder:

[0014] (1) adding concentration in container is that 20~35% sodium hydroxide solution and weight percent are 1~5% surfactant solution and stir evenly, the volume ratio of sodium hydroxide solution and surfactant solution is 10: 1~ 5:1, slowly add titanyl sulfate solution with a concentration of 130-170g / L dropwise at a uniform speed, stop dropping until pH = 6.5-7, and age the white precipitate of the titanium dioxide precursor produced for 1-6 hours; add sulfuric acid dropwise It is best to add the titanyl solution dropwise at a constant speed so that the local temperature of t...

Embodiment 1

[0018] Embodiment 1: Add 50ml of 25% sodium hydroxide solution in the container, then add 5ml of surfactant polyethylene glycol with a weight percentage of 5%, stir evenly; slowly and uniformly add titanyl sulfate with a concentration of 130g / L Put the solution into a beaker until the pH value is equal to 7.0; filter after aging for 3 hours, wash the precipitate with hot water with a temperature greater than 50°C until the filtrate has no sulfate radicals; put the product in an oven at 85°C for 8 hours, and put it Transfer to a muffle furnace for heat treatment, control the heating rate at about 5°C / min, slowly raise the temperature to 450°C, keep it warm for 1 hour, turn off the power and cool to room temperature; grind to obtain the product.

[0019] The prepared nano-mesoporous titanium dioxide powder is characterized by: anatase type; the specific surface area of ​​the nano-mesoporous titanium dioxide powder is 149m 2 / g, pore size distribution: 10~15nm, particle size: 8.0...

Embodiment 2

[0020] Embodiment 2: Add 50ml of 25% sodium hydroxide solution in the container, then add 5ml of surfactant polyethylene glycol with a percentage by weight of 3%, stir evenly; slowly and uniformly add titanyl sulfate with a concentration of 150g / L Put the solution into a beaker until the pH value is equal to 7.0; filter after aging for 3 hours, wash the precipitate with hot water with a temperature greater than 50°C until the filtrate has no sulfate radicals; put the product in an oven at 85°C for 8 hours, and put it Transfer to a muffle furnace for heat treatment, control the heating rate at about 5°C / min, slowly raise the temperature to 550°C, keep it warm for 1.5 hours, turn off the power and cool to room temperature; grind to obtain the product.

[0021] The prepared nanometer mesoporous titanium dioxide powder is characterized by: anatase type; the specific surface area of ​​the nanometer mesoporous titanium dioxide powder is 103m 2 / g, pore size distribution: 5-10nm, par...

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Abstract

The preparation process of nanometer mesoporous TiO2 powder includes TiO2 gel particle with titanyl sulfate and sodium hydroxide as main material, water as solvent and surfactant; and subsequent filtering, drying, heat treatment and grinding to prepare nanometer anatase type mesoporous TiO2 powder with pore diameter of 2-15 nm, particle size of 8-15 nm and specific surface area of 80-150 sq m / g. The preparation process has low cost is suitable for industrial production. The prepared nanometer mesoporous TiO2 has wall of nanometer anatase type crystal, may be ultraviolet excited to generate photoelectron and photohole and is suitable for use as catalyst.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing nanometer mesoporous titanium dioxide powder. Background technique [0002] At present, the research on nanomaterials has developed rapidly in recent years, and its related applications have also begun to take shape. The surface effect and size effect of nanocrystals are the most significant properties different from traditional powders. With the rise of nanomaterials, materials with various structures such as nanopores, nanocrystals, and nanotubes have been prepared. The field of catalysis has become one of the most important applications of these nanostructured materials, and other uses are also urgently needed to be developed. [0003] For the study of nanomaterials, nanofunctional materials are the fastest growing growth point, and titanium dioxide materials are currently a hot spot in the research of nanofunctional materials. It not only ...

Claims

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Application Information

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IPC IPC(8): C01G23/04C01G23/047
Inventor 戴亚堂陶宁涂铭旌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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