Preparation method of nano mesoporous titania with core-shell structure

A nano-mesoporous, core-shell structure technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of large particles, non-uniformity, single crystal structure of mesoporous titanium oxide, etc., to achieve large specific surface area and raw material cost. Low, uniform aperture effect

Inactive Publication Date: 2010-05-05
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the crystal structure of mesoporous titanium oxide prepared by these methods is single, and the particles are large and inhomogeneous, which limits its popula

Method used

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  • Preparation method of nano mesoporous titania with core-shell structure
  • Preparation method of nano mesoporous titania with core-shell structure
  • Preparation method of nano mesoporous titania with core-shell structure

Examples

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Example Embodiment

[0019] Example 1:

[0020] Using sodium trititanate as the raw material, adding 4% sodium lauryl sulfate by mass, after high-energy pulverization, a powder with a particle size of 50-1000 nanometers is obtained; adding water twice the mass of the powder at 180°C, 3MPa React in the environment for 24 hours; add hydrochloric acid solution, adjust pH=1, then filter, wash, dry, heat treatment at 400℃ for 2 hours to obtain nano mesoporous titanium oxide powder with core-shell structure, in which the core is sharp Ilmenite type titanium oxide, the shell is monoclinic titanium oxide, the specific surface area is 180m 2 / g, the pore volume is 0.28cm 3 / g, the most probable pore size is 11nm. The obtained product and P25 titanium oxide (Degussa) were used to degrade methyl orange by ultraviolet light respectively. The results are shown in image 3 This experiment proves that the product explanation rate of the present invention is higher than P25, and its activity is higher than P25.

Example Embodiment

[0021] Example 2:

[0022] Using potassium dititanate as raw material, adding 0.1% by mass of titanate coupling agent, after high-energy pulverization, a powder with a particle size of 50-1000 nanometers is obtained; adding water 3.5 times the mass of the powder at 300℃, 2MPa Reacted for 4 hours in the environment; added sulfuric acid solution, adjusted pH=3, then was filtered, washed, dried, and heat-treated at 200°C for 8 hours to obtain nano mesoporous titanium oxide powder with core-shell structure, in which the core is sharp Titanite type titanium oxide, the shell is rutile type titanium oxide, the specific surface area is 130m 2 / g, the pore volume is 0.22cm 3 / g, the most probable pore size is 8nm. figure 2 The curve can prove that the product has a nanometer pore size.

Example Embodiment

[0023] Example 3:

[0024] Using potassium tetratitanate as raw material, adding polyethylene glycol of 5% by mass, after high-energy pulverization, a powder with a particle size of 50-1000 nanometers is obtained; adding water 5 times the mass of the powder at 60°C and 18MPa React for 48 hours; add nitric acid solution, adjust pH=0.5, then filter, wash, dry, and heat treatment at 800℃ for 0.5 hours to obtain nano mesoporous titanium oxide powder with core-shell structure, in which the core is rutile-type oxide Titanium, the shell is anatase titanium oxide, the specific surface area is 202m 2 / g, the pore volume is 0.30cm 3 / g, the most probable pore size is 13nm.

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Abstract

The invention discloses a preparation method of nano mesoporous titania with a core-shell structure, which comprises the following steps of: carrying out high-energy milling after mixing layered titanate with a surface active agent to obtain powder with a grain diameter of 50-1000 nanometers; adding water with the mass of 0.1-5 times of that of the powder into the powder; reacting for 0.5-48h under 2-20 standard atmospheric pressures and the temperature of 50-300 DEG C; then adding an acid solution to regulate the pH value to be 0.5-3; and thermally treating for 0.5-8h at 200-800 DEG C after stabilizing, filtering, washing and drying to obtain nano mesoporous titania with a core-shell structure. The method has low cost of raw materials, wide sources, simple process and easy industrialization; and the prepared nano mesoporous titania has fine structure and high activity.

Description

technical field [0001] The invention belongs to the technical field of preparation of new inorganic materials, and in particular relates to a preparation method of a nanometer mesoporous titanium oxide material with a large specific surface area and a core-shell structure. Background technique [0002] As a new type of semiconductor, titanium dioxide has been a research hotspot in the past 20 years in the fields of electronic ceramics, structural ceramics, photoelectric cells, photocatalysis, sensors, coatings, and biomedicine. Introducing the structural characteristics of mesoporous materials into TiO 2 , can increase the specific surface, uniform pore size, and have a skeleton structure composed of nano-scale particles, mesoporous TiO 2 It will have superior adsorption performance and higher catalytic activity than non-porous materials. Jimmy et al. proved that mesoporous TiO by the photooxidation reaction of acetone in air 2 thin film than nano TiO 2 The thin film has...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 陆小华曹斌姚文俊王昌松杨祝红
Owner NANJING UNIV OF TECH
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