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Preparation method of two-dimensional porous titanium dioxide nanosheet

A technology of porous titanium dioxide and nanosheets, which is applied in the directions of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., to achieve the effects of good crystallinity, improved performance, and increased reactive sites

Inactive Publication Date: 2019-06-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of titanium dioxide nanosheet with high purity and good crystallinity in view of the technical deficiency that the existing titanium dioxide nanosheets have many grain boundaries, which are easy to become the recombination center of photogenerated electrons and holes in the photocatalytic process. , Preparation method of two-dimensional porous titania nanosheets with large specific surface area

Method used

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  • Preparation method of two-dimensional porous titanium dioxide nanosheet

Examples

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Embodiment 1

[0041] A preparation method of porous titanium dioxide nanosheets, comprising the following steps:

[0042] (1) Add titanium tetrachloride to the ammonium chloride aqueous solution with a molar concentration of 3.12mol / L (volume ratio is 1:100). Since titanium tetrachloride is easily hydrolyzed when heated, the ammonium chloride aqueous solution should be placed in Cool down in an ice-water bath, then slowly add titanium tetrachloride solution, keep stirring at a constant speed to prevent insufficient dissolution, and form a transparent mixed solution M1;

[0043] (2) Add 1g of dicyandiamide to 20mL of ammonium chloride aqueous solution with a molar concentration of 4.6mol / L. Since dicyandiamine is not easily soluble in water at room temperature (25°C), it has a high solubility in hot water ; But when heated to 80°C, a decomposition reaction will occur to produce ammonia (NH 3 ). In order to quickly dissolve dicyandiamine without decomposition reaction, first heat the ammoni...

Embodiment 2

[0050] A preparation method of porous titanium dioxide nanosheets, except that the volume ratio of titanium tetrachloride and ammonium chloride aqueous solution is changed to 0.5:100 in step (1), other operations are the same as in Example 1, and porous titanium dioxide nanosheets are prepared. piece.

Embodiment 3

[0052] A preparation method of porous titanium dioxide nanosheets, except that the volume ratio of titanium tetrachloride and ammonium chloride aqueous solution is changed to 2:100 in step (1), other operations are all the same as in Example 1, and porous titanium dioxide nanosheets are prepared. piece.

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Abstract

The invention discloses a preparation method of a two-dimensional porous titanium dioxide nanosheet. The preparation method comprises steps as follows: firstly, titanium tetrachloride and cyanoguanidine are respectively mixed with an aqueous ammonium chloride solution, the two mixed solutions are mixed in proportion, freeze drying is performed, white powder is obtained, put in a crucible and calcined in a pit furnace, a precursor TiO-CN is prepared and then is transferred to a porcelain boat and calcined in a muffle furnace, and the two-dimensional porous titanium dioxide nanosheet is preparedfinally. The titanium dioxide nanosheet prepared with the method is high in purity and good in crystallinity, and the technical problems that photoelectron-hole is easily composited and solar energyutilization rate is low are solved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and more specifically relates to a preparation method of two-dimensional porous titanium dioxide nanosheets. Background technique [0002] TiO 2 It is the earliest semiconductor material that can realize photocatalytic water splitting. It has the advantages of high stability, low cost, corrosion resistance, and no pollution to the environment. It is used in photo / electrocatalytic water splitting, lithium ion batteries, sodium ion batteries, fuel sensitive It has broad application prospects in the field of chemical solar cells and has attracted widespread attention. [0003] In nature, TiO 2 There are three crystal phases, namely, anatase phase, rutile phase, and brookite phase. Since the brookite phase is unstable, anatase phase and rutile phase are the most studied. It was found that in the anatase phase TiO 2 There are more defects and vacancies in it, so that it is better ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08C01G23/053B82Y40/00B01J21/06
Inventor 鲁统部魏振巍卢秀利
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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