Mesoporous titanium dioxide material and preparation method thereof

A technology of mesoporous titanium dioxide and pore size, which is applied in the field of mesoporous materials, can solve the problems of insufficient environmental protection of the preparation system, complex preparation system, and lengthy process, and achieve the effects of stable room temperature, simple control process, and simple and easy method

Inactive Publication Date: 2014-08-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The adjustment of the pore structure is largely limited by the size of the "soft" template (molecular weight and the size of the formed micelles)
The preparation process requires effective control of the hydrolysis and polycondensation reactions of the titanium dioxide precursor, so the preparation system is more complex, the process is lengthy, and the preparation time can be as long as several weeks; and non-polar solvents (such as small molecule alcohols) are often required use, the preparation system is not environmentally friendly
[0005] As for how to overcome the above problems, many researchers / teams have proposed some solutions, but they can only partially solve the above problems. At present, there is still a lack of mesoporous TiO that can systematically solve the above problems. 2 Preparation system to further promote its application in various fields

Method used

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  • Mesoporous titanium dioxide material and preparation method thereof
  • Mesoporous titanium dioxide material and preparation method thereof
  • Mesoporous titanium dioxide material and preparation method thereof

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preparation example Construction

[0043] There are many methods for preparing titanic acid. Among them, the method of preparing titanic acid by reacting the initial titanium source with water or using titanyl sulfate as the initial titanium source is relatively simple, and the reaction conditions are easy to control. Specifically, the initial titanium source includes four Any one or more of titanium chloride, titanium trichloride, and titanates;

[0044] The initial titanium source reacts with water to produce titanic acid through hydrolysis and condensation;

[0045] The molar ratio of the initial titanium source to water is 5-10:1.

[0046] More preferably, the initial titanium source is titanium tetrachloride. Titanates include tetrabutyl orthotitanate, tetraisopropyl titanate, ethyl titanate, methyl titanate, and the like.

[0047] Preferably, the initial titanium source is titanyl sulfate, and the titanyl sulfate is neutralized with ammonia water to a pH value of 6-8 to obtain a precipitate, which is wa...

Embodiment 1

[0053] Titanyl sulfate is neutralized with ammonia water to a pH value of 7 to obtain a precipitate, which is washed and centrifuged to obtain titanic acid;

[0054] Titanic acid and hydrogen peroxide react in water to prepare peroxide titanic acid sol, and the molar ratio between titanic acid, hydrogen peroxide and water is 1:15:120;

[0055] P123(EO 20 PO 70 EO 20 ) Surfactant is added to peroxotitanic acid sol solution, and mixed to obtain a self-assembly system, the molar ratio of surfactant to titanic acid is 0.03:1;

[0056] The self-assembly system volatilizes its own liquid, and the volatilization temperature is 100°C to obtain a composite material of peroxotitanic acid and surfactant;

[0057] The composite material was heated at a heating rate of 2° C. / min, and fired at 450° C. for 2 hours to obtain a mesoporous titanium dioxide material.

[0058] The mesoporous structure of the obtained mesoporous titanium dioxide material can be seen by scanning electron micros...

Embodiment 2

[0060] The molar ratio of titanium trichloride and water is 7:1 to react to produce titanic acid;

[0061] Titanic acid and hydrogen peroxide react in water to prepare peroxide titanic acid sol, the molar ratio between titanic acid, hydrogen peroxide and water is 1:15:100;

[0062] Polyoxyethylene-polyoxybutylene (EO 10 BO 18 ) Surfactant is added to peroxotitanic acid sol solution, and mixed to obtain a self-assembly system, the molar ratio of surfactant to titanic acid is 0.01:1;

[0063] The self-assembly system volatilizes its own liquid, and the volatilization temperature is 50°C to obtain a composite material of peroxotitanic acid and surfactant;

[0064] The composite material was heated at a heating rate of 3°C / min, and fired at 450°C for 4 hours to obtain a mesoporous titanium dioxide material.

[0065] The mesoporous structure of the obtained mesoporous titanium dioxide material can be seen by scanning electron microscopy, and its three-dimensional interconnected ...

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Abstract

The invention relates to the field of a mesoporous material, and in particular relates to a mesoporous titanium dioxide material and a preparation method thereof. According to the mesoporous titanium dioxide material disclosed by the invention, an aperture is 10-30nm, a specific surface area is 63-235m<2>/g and a pore volume is 0.55-1.02cm<3>/g. Compared to a current mesoporous titanium dioxide material, the mesoporous titanium dioxide material disclosed by the invention greatly improves specific surface area, aperture and pore volume; the preparation method comprises the following steps: preparing titanium peroxide acid sol through titanic acid and hydrogen peroxide, forming an self-assembling system through titanium oxide acid sol and a surfactant, and drying and baking the self-assembling system to obtain the mesoporous titanium dioxide material; the method is simple and easy to implement; moreover, the entire preparation process is free from other organic chelating agents or inorganic additives and mineral acids; the preparation system is a pure water system which is independent from any other non-polar or weak-polar solvents; and in addition, the titanium peroxide acid sol prepared is relatively stable at room temperature, and control process is relatively simple.

Description

technical field [0001] The invention relates to the field of mesoporous materials, in particular to a mesoporous titanium dioxide material and a preparation method thereof. Background technique [0002] Solving the energy crisis and environmental problems has become a challenge that human beings must face to achieve sustainable development in the 21st century. The progress of science and technology in the past few decades, especially the rapid development of nanoscience and technology, is the best comment and proof of the efforts of human beings to actively face the dual pressure of energy and environment. Since Fujishima et al. discovered that titanium dioxide electrodes can electrolyze water under ultraviolet light in 1972, nano-TiO 2 It has been proved to have important application prospects in fields such as photovoltaics, photocatalysis, photoelectrochemistry and photoelectric sensors, thus causing a worldwide upsurge in its research. In 1992, Antonelli et al. prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 王伟阮成东茹红强
Owner NORTHEASTERN UNIV
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