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Titanium dioxide hollow micro-nano spheres as well as preparation method and application thereof

A technology of titanium dioxide and micro-nanospheres, which is applied in the field of photocatalysis, can solve the problems that the properties of titanium dioxide hollow nanospheres cannot be precisely controlled, and the process of titanium dioxide hollow nanospheres is difficult to predict, so as to protect agglomeration and excessive growth, improve catalytic performance, and avoid burning The effect of the erosion process

Inactive Publication Date: 2017-12-01
武汉中科先进材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of preparing titanium dioxide hollow nanospheres by template-free hydrothermal method is difficult to predict, so it is impossible to precisely control the properties of titanium dioxide hollow nanospheres

Method used

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  • Titanium dioxide hollow micro-nano spheres as well as preparation method and application thereof
  • Titanium dioxide hollow micro-nano spheres as well as preparation method and application thereof
  • Titanium dioxide hollow micro-nano spheres as well as preparation method and application thereof

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preparation example Construction

[0040] The invention provides a method for preparing titanium dioxide hollow micro-nanospheres, comprising the following steps: (1) preparing or obtaining porous titanium dioxide micro-nanospheres; (2) loading a linear polymer on the surface of the porous titanium dioxide micro-nanospheres, Obtaining titanium dioxide micronanospheres loaded with linear polymers; (3) coating the surface of the titanium dioxide micronanospheres loaded with linear polymers with a crosslinked polymer; (4) calcining to obtain hollow titanium dioxide micronanospheres.

[0041] The method for preparing titanium dioxide micro-nanospheres in the step (1) can be selected from the photocatalytic surface polymerization method, and the specific steps include: adding tetrabutyl titanate to the alcohol solution of hydroxypropyl cellulose, stirring and reacting, separating the product, washing, The product is dispersed in water to obtain a dispersion liquid of the product, sodium fluoride is added therein, hea...

Embodiment 1

[0049] Titanium dioxide hollow micro-nanospheres were prepared by the following method:

[0050] (1) Preparation of porous titanium dioxide micro-nanospheres

[0051] In this example, titanium dioxide micro-nanospheres were prepared by photocatalytic surface polymerization, and 0.05 g of hydroxypropyl cellulose (HPC) was dissolved in 0.1 mL of H 2 O ethanol 20mL. Stir for 30 minutes to completely dissolve HPC, then add 1 mL of tetrabutyl titanate (TBOT) to the above solution and stir for 15 minutes to stop. After standing for 3 hours, collect the product by centrifugation, wash with ethanol and water, and disperse in 19 mL of water to obtain the product of the dispersion. Add 1mg NaF to the above dispersion and stir for 30min, heat the system to 50°C for 2h, cool to room temperature naturally, wash twice with water and ethanol, and finally disperse in 20mL ethanol solution for later use.

[0052] (2) Preparation of porous titanium dioxide micro-nanospheres modified by MPS ...

Embodiment 2

[0065] Titanium dioxide hollow micro-nanospheres were prepared by the following method:

[0066] (1) Preparation of porous titanium dioxide micro-nanospheres

[0067] In this example, titanium dioxide micro-nanospheres were prepared by photocatalytic surface polymerization, and 0.5 g of hydroxypropyl cellulose (HPC) was dissolved in 5 mL of H 2 O ethanol 50mL. Stir for 30 minutes to completely dissolve HPC, then add 3 mL of tetrabutyl titanate (TBOT) to the above solution and stir for 60 minutes to stop. After standing for 12 hours, collect the product by centrifugation, wash with ethanol and water, and disperse in 50 mL of water to obtain the product of the dispersion. Add 50mg NaF to the above dispersion and stir for 30min, heat the system to 100°C for 2h, cool to room temperature naturally, wash twice with water and ethanol, and finally disperse in 20mL ethanol solution for later use.

[0068] (2) Preparation of porous titanium dioxide micro-nanospheres modified by MPS ...

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Abstract

The invention discloses titanium dioxide hollow micro-nano spheres as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly preparing or collecting porous titanium dioxide micro-nano spheres, then loading the porous titanium dioxide micro-nano spheres with a straight-chain polymer on the porous titanium dioxide micro-nano spheres to obtain titanium dioxide micro-nano spheres loaded with the straight-chain polymer, then coating the surface of the titanium dioxide micro-nano spheres loaded with the straight-chain polymer with a cross-linked polymer, calcining, wherein since the straight-chain polymer and the cross-linked polymer are different in decomposition speed in the calcining process, a titanium dioxide migration acting force is generated, so that the titanium dioxide crystal grains migrate, the titanium dioxide is transferred into the cross-linked polymer coating layer and fixed and limited by functional groups on the surface of the cross-linked polymer, and the agglomeration and excessive growth of the titanium dioxide crystal grains in the calcining process can be effectively protected, and finally obtaining the titanium dioxide hollow micro-nano spheres. The obtained titanium dioxide hollow micro-nano spheres are large in specific surface areaw and small in crystal particle size; and moreover, compared with the titanium dioxide hollow micro-nano spheres prepared by a traditional template, the catalytic performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a titanium dioxide hollow micro-nano sphere, its preparation method and application. Background technique [0002] Titanium dioxide is one of the most widely used semiconductor materials. Because titanium dioxide has the advantages of low price, good chemical and mechanical stability, non-toxicity, and high catalytic activity, it has broad application prospects in catalysis, adsorption, batteries, and biology. Titanium dioxide with a hollow structure has the advantages of low density and large specific surface area, which has attracted the attention of a large number of researchers. Numerous studies have shown that porous titanium dioxide hollow micro-nano materials have the advantages of low density, large specific surface area, many active sites, excellent transmission permeability and strong light capture ability, etc., and have become a hot research topic in the field...

Claims

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Application Information

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IPC IPC(8): C01G23/047B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/047C01P2002/72C01P2004/03C01P2004/34C01P2004/62C01P2004/64C01P2006/12
Inventor 王欣白力诚喻学锋
Owner 武汉中科先进材料科技有限公司
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