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Method for preparing ordered mesoporous strontium titanate

A strontium titanate and mesoporous technology, applied in the field of preparation of ordered mesoporous strontium titanate, can solve the problems of low specific surface area and the like

Active Publication Date: 2016-11-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mesoporous strontium titanate prepared by the traditional template method has disordered channels and low specific surface area

Method used

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  • Method for preparing ordered mesoporous strontium titanate
  • Method for preparing ordered mesoporous strontium titanate
  • Method for preparing ordered mesoporous strontium titanate

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preparation example Construction

[0020] The preparation method of the ordered mesoporous strontium titanate of the present invention comprises the following steps:

[0021] (1), dissolve the surfactant in absolute ethanol, stir to form a transparent solution; then dropwise add the ethanol solution of the phenolic resin, the amount of the phenolic resin corresponding to every 1g of the surfactant ranges from 1 to 1.5g, stir uniform, spare;

[0022] (2) Adjust the pH of absolute ethanol to <1 with HCl solution, then add tetra-n-butyl titanate and strontium acetate, and stir to obtain a solution; set aside;

[0023] (3), add the solution obtained in step (2) dropwise to the solution obtained in step (1), the amount of tetra-n-butyl titanate corresponding to 1g of surfactant is in the range of 1.5-2g, stir to make it Mix well to obtain an orange solution;

[0024] (4) Transfer the solution prepared in step (3) to a flat-bottomed container, conduct solvent evaporation at 25° C. to induce self-assembly for at lea...

Embodiment 1

[0033] (1) 1g polyoxyethylene / polyoxypropylene / polyoxyethylene amphiphilic block copolymer F127 (purchased from Sigma-Aldrich Company) and 1.25g phenolic resin ethanol solution (phenolic resin mass fraction 20%) were dissolved in 6ml In absolute ethanol, stir for 1 h to form a transparent solution A;

[0034] (2) Add 1ml of concentrated HCl solution (10mol / L) to 3ml of absolute ethanol, adjust the pH<1, then slowly add 1.7g of tetra-n-butyl titanate and 1.05g of strontium acetate, and magnetically stir to obtain a transparent solution B;

[0035] (3) Then add solution B to solution A dropwise, stir for 1 h to make it evenly mixed, thereby obtaining an orange-yellow solution;

[0036] (4) Transfer the orange-yellow solution to a flat-bottomed container, induce self-assembly by solvent evaporation at 25°C for 24h, and then thermally polymerize at 100°C for 12h to form an orange-yellow film;

[0037] (4) Put the orange-yellow film into a porcelain boat, heat-treat it in an atmo...

Embodiment 2

[0041] (1) 1g polyoxyethylene / polyoxypropylene / polyoxyethylene amphiphilic block copolymer F127 (purchased from Sigma-Aldrich Company) and 1g ethanol solution of phenolic resin (phenolic resin mass fraction 20%) were dissolved in 6ml without In water and ethanol, stir for 1 hour to form a transparent solution A;

[0042] (2) Add 1ml of concentrated HCl solution (10mol / L) to 3ml of absolute ethanol, adjust the pH<1, then slowly add 2g of tetra-n-butyl titanate and 1.24g of strontium acetate, and magnetically stir to obtain a transparent solution B ;

[0043] (3) Then add solution B to solution A dropwise, stir for 1 h to make it evenly mixed, thereby obtaining an orange-yellow solution;

[0044] (4) Transfer the orange-yellow solution to a flat-bottomed container, induce self-assembly by solvent evaporation at 25°C for 24h, and then thermally polymerize at 80°C for 24h to form an orange-yellow film;

[0045] (4) Put the orange-yellow film into a porcelain boat, heat-treat it in...

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Abstract

The invention discloses a method for preparing ordered mesoporous strontium titanate. The method comprises the following steps: dissolving a nonionic surfactant, phenol-formaldehyde resin, tetrabutyl titanate, strontium acetate and concentrated hydrochloric acid in ethanol, carrying out stirring so as to obtain an orange solution, then, transferring the orange solution into a flat-bottomed vessel, carrying out solvent-induced self-assembly for at least 24 hours, and then, carrying out thermal polymerization for at least 12 hours at the temperature of 80 DEG C to 100 DEG C so as to form an orange film; and then, carrying out high-temperature heat treatment sequentially in an inert atmosphere and an air atmosphere, thereby obtaining a white ordered mesoporous strontium titanate film. The product prepared by the method is large in specific surface area, uniform in pore passage and high in orderliness and has a broad application prospect in the fields of photocatalytic degradation, photoelectrocatalytic water decomposition, artificial photosynthesis, photo-assisted energy storage batteries and the like.

Description

Technical field: [0001] The invention relates to a method for preparing ordered mesoporous strontium titanate, belonging to the field of inorganic non-metallic materials. Background technique: [0002] TiO was first reported since 1972 2 Since electrode photoelectric water splitting, photocatalysts based on semiconductor oxides have attracted more and more attention (Nature, 1972, 238, 37–38.), especially in the fields of energy and sustainable development, which have very broad application prospects. After entering the 21st century, due to the shortage of fossil fuels and global warming, the photochemical reduction of carbon dioxide on the surface of photocatalysts has become a new research hotspot. The photocatalytic carbon dioxide reduction reaction is similar to other heterogeneous catalytic reactions, and the specific surface area is a very important parameter. At present, researchers have developed a variety of nanostructures for semiconductor oxide photocatalysts to...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/47
CPCC04B35/47C04B38/067C04B38/0054
Inventor 王涛范晓莉高斌薛海荣郭虎龚浩何建平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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