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Titanium dioxide powder with nanocrystalline lapped loose structure and preparation method thereof

A titanium dioxide and nanocrystal technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems such as the increase of equipment investment cost by concentrated hydrochloric acid and the difficulty of repeatable control of pore size distribution and porosity.

Active Publication Date: 2021-07-06
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method does not use a template agent, the use of concentrated hydrochloric acid increases the cost of equipment investment and the difficulty of controlling the repeatability of pore size distribution and porosity.

Method used

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  • Titanium dioxide powder with nanocrystalline lapped loose structure and preparation method thereof
  • Titanium dioxide powder with nanocrystalline lapped loose structure and preparation method thereof
  • Titanium dioxide powder with nanocrystalline lapped loose structure and preparation method thereof

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[0043] The invention relates to a titanium dioxide powder material with a nanocrystalline overlapping loose structure and a preparation method thereof. No template agent is required. The titanium dioxide powder of the invention has a pore structure in which mesopores and macropores interpenetrate in three dimensions, and the diameter of the macropores ranges from 0.1-1 μm, the range of mesopore diameter is 2-8 nm and 15-80nm, the specific surface area is 40.52-112.76 m 2 / g.

[0044] The steps of the preparation method of titanium dioxide powder with nanocrystalline overlapping loose structure are as follows:

[0045] (1) Dissolve tetrabutyl titanate in absolute ethanol, the volume ratio of tetrabutyl titanate to absolute ethanol is 1:1-6, stir well and add diethanolamine, the molar ratio of tetrabutyl titanate to diethanolamine The ratio is 1:(0.02-0.15), and the ethanol solution of butyl titanate complexed with diethanolamine is obtained;

[0046] (2) Weigh the deionized wat...

Embodiment 1

[0057] The steps of the preparation method of titanium dioxide powder with nanocrystalline overlapping loose structure are as follows:

[0058] (1) Dissolve tetrabutyl titanate in absolute ethanol at a volume ratio of 1:1, stir well and add diethanolamine. The molar ratio of tetrabutyl titanate to diethanolamine is 1:0.08 to obtain diethanolamine complexation Butyl titanate ethanol solution;

[0059] (2) Weigh deionized water according to the volume ratio of tetrabutyl titanate to water of 1:4, and weigh absolute ethanol according to the volume ratio of water and ethanol of 1:1. Ionized water and absolute ethanol are mixed in the container to obtain ethanol aqueous solution;

[0060] (3) Use glacial acetic acid or ammonia water to adjust the pH value of the ethanol aqueous solution to 5;

[0061] (4) Under stirring conditions, drop the butyl titanate ethanol solution into the pH-adjusted ethanol aqueous solution at a rate of 5 mL / min, and continue stirring for 0.5 h after th...

Embodiment 2

[0067] The steps of the preparation method of titanium dioxide powder with nanocrystalline overlapping loose structure are as follows:

[0068] (1) Dissolve tetrabutyl titanate in absolute ethanol at a volume ratio of 1:2, stir well and add diethanolamine. The molar ratio of tetrabutyl titanate to diethanolamine is 1:0.15 to obtain diethanolamine complexation Butyl titanate ethanol solution;

[0069] (2) Weigh the deionized water according to the volume ratio of tetrabutyl titanate and water as 1:6, and weigh the absolute ethanol according to the volume ratio of water and ethanol as 1:0.1. Ionized water and absolute ethanol are mixed in the container to obtain ethanol aqueous solution;

[0070] (3) Adjust the pH value of the aqueous ethanol solution to 6 with glacial acetic acid or ammonia water;

[0071] (4) Under stirring conditions, drop the butyl titanate ethanol solution into the pH-adjusted ethanol aqueous solution at a rate of 6 mL / min, and continue stirring for 0.5 h...

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Abstract

The invention relates to a titanium dioxide powder with a nanocrystalline overlapping loose structure and a preparation method thereof. The titanium dioxide powder with a loose porous structure has a micro-nano hierarchical structure formed by loosely overlapping anatase nanocrystal grains, and the powder diameter ranges from 3‑10 μm, spherical nanocrystals with a size range of 20‑60 nm, stacked to form a pore structure in which mesopores and macropores interpenetrate in three-dimensional directions. 15‑80nm, the specific surface area is 40.52‑112.76 m 2 / g. Preparation method: dissolve tetrabutyl titanate in absolute ethanol, add diethanolamine; weigh deionized water and absolute ethanol, mix the weighed deionized water and absolute ethanol in a container; adjust the ethanol aqueous solution pH value; drop the butyl titanate ethanol solution into the pH-adjusted ethanol aqueous solution; put the suspension into a reaction kettle, and then separate the solid phase as a precursor; roast. The specific surface area of ​​the powder is high, and the utilization rate of light absorption is large.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal oxide functional materials, and in particular relates to a titanium dioxide powder material with a nanocrystalline overlapping loose structure and a preparation method thereof. Background technique [0002] Nanocrystalline TiO 2 It has the characteristics of good catalytic activity, high chemical stability, direct use of solar energy for reaction, non-toxic and safe, and low price. It is an ideal gas sensing material, photocatalytic degradation material and solar cell photoanode material. However, there are still many problems in practical application, such as nanopowders are easy to agglomerate during storage, it is difficult to maintain the continuous stability of its structure and performance during use, the absorption efficiency of visible light is not high, and the recycling ability needs to be further improved. issues such as promotion. Therefore, how to control the synthesis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047C01G23/053
CPCC01G23/047C01G23/053C01P2004/03C01P2004/61C01P2006/12C01P2006/17
Inventor 李明春李胜飞杨浩
Owner SHENYANG POLYTECHNIC UNIV