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Titanium dioxide nanoflower rich in oxygen vacancies and preparation method of titanium dioxide nanoflower

A technology of titanium dioxide and nanoflowers, applied in chemical instruments and methods, catalyst activation/preparation, inorganic chemistry, etc., can solve problems such as poor monodispersity of titanium dioxide nanoflowers, weak light absorption of titanium dioxide, wide product size distribution, etc., to broaden the absorption range, increased multiple scattering performance, and the effect of simple preparation methods

Active Publication Date: 2018-11-02
ZHEJIANG UNIV CITY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the above problems, to provide a kind of oxygen-vacancy titanium dioxide nanoflower and its preparation method, the oxygen-vacancy titanium dioxide nanoflower prepared by the method solves the problem of low photocatalytic efficiency and low light absorption of titanium dioxide in the prior art. The problems of poor monodispersity and wide product size distribution of the prepared titanium dioxide nanoflowers

Method used

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  • Titanium dioxide nanoflower rich in oxygen vacancies and preparation method of titanium dioxide nanoflower
  • Titanium dioxide nanoflower rich in oxygen vacancies and preparation method of titanium dioxide nanoflower
  • Titanium dioxide nanoflower rich in oxygen vacancies and preparation method of titanium dioxide nanoflower

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Embodiment 1

[0019] Add 0.025 mL of diethylenetriamine (EDTA) to 31.5 mL of isopropanol, and stir for 10 min. Then, 1.125 mL of diisopropyl di(acetylacetonato)titanate was added to the solution. Stirring was continued for 10 min. The resulting mixed solution was poured into a reaction kettle, and subjected to solvent heat treatment at 200° C. for 24 hours. After the reaction, the precipitate was washed three times with deionized water and absolute ethanol respectively, placed in an oven at 60° C., and dried for 24 hours to obtain an oxygen-vacancy titanium dioxide nanoflower material.

[0020] figure 1 , 2 They are scanning electron microscope images (SEM) and transmission electron microscope images (TEM) of the oxygen-rich vacancy titanium dioxide nanoflowers prepared in Example 1, respectively. It can be clearly seen from the figure that the size of the oxygen-rich titanium dioxide nanoflowers is 500-1000nm , which is formed by self-assembly of ultra-thin titanium dioxide nanosheets,...

Embodiment 2

[0024] Add 0.05 mL of diethylenetriamine (EDTA) to 31.5 mL of isopropanol solution, and stir for 10 min. 1.125 mL of diisopropyl di(acetylacetonato)titanate was added to the solution. Stirring was continued for 10 min. The resulting mixed solution was poured into a reaction kettle, and subjected to solvent heat treatment at 150° C. for 36 hours. After the reaction, the precipitate was washed three times with deionized water and absolute ethanol, placed in an oven at 60° C., and dried for 24 hours to obtain an oxygen-vacancy titanium dioxide nanoflower material.

[0025] Figure 5 Scanning electron microscope pictures (SEM) of the oxygen-vacancy titanium dioxide nanoflowers prepared for Example 2, as can be seen from the figure, the size of the titanium dioxide nanoflowers is 100-300nm, which is formed by the self-assembly of ultra-thin titanium dioxide nanosheets, nano The sheet thickness is 2-9 nm, and compared with the titanium dioxide nanoflowers obtained in Example 1, t...

Embodiment 3

[0027] Add 1.125 mL of diisopropyl di(acetylacetonate) titanate to 31.5 mL of isopropanol solution. Stir for 10 min. The resulting mixed solution was poured into a reaction kettle, and subjected to solvent heat treatment at 200° C. for 24 hours. After the reaction, the precipitate was washed three times with deionized water and absolute ethanol, placed in an oven at 60° C., and dried for 24 hours to obtain a sample.

[0028] Figure 6 For the scanning electron microscope picture (SEM) of the sample prepared for this example, it is obvious from the figure that diethylenetriamine is not added in the preparation process, and the prepared titanium dioxide does not form a hierarchical structure, but exists in the form of particles, indicating that The morphology and size of oxygen-vacancy-rich titania nanoflowers can be controlled by the amount of diethylenetriamine added.

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Abstract

The invention discloses a preparation method of a titanium dioxide nanoflower rich in oxygen vacancies. The method comprises steps as follows: the titanium dioxide nanoflower rich in oxygen vacanciesis prepared from ultrathin anatase nanosheets by self-assembly and is rich in a large number of oxygen vacancies. The titanium dioxide nanoflower rich in oxygen vacancies is an efficient and stable photoelectric converting material and is prepared with a solvothermal method, a preparation process is simple, reaction conditions are easy to control, and therefore, the titanium dioxide nanoflower issuitable for large-scale preparation and industrial production.

Description

technical field [0001] The invention relates to an oxygen-vacancy titanium dioxide nanoflower and a preparation method thereof, which belong to the field of nanometer material and semiconductor oxide material technology and photocatalysis. Background technique [0002] In recent years, titanium dioxide nanoflowers have been widely used in the field of photocatalysis due to their large specific surface area, good crystal orientation and good separation performance of photogenerated carriers. However, the wide band gap (3.2eV) of titanium dioxide nanoflowers causes it to only absorb ultraviolet light, which severely limits its photocatalytic performance. At present, researchers have proposed different strategies to broaden the light absorption range of titanium dioxide nanoflowers, such as noble metal modification, metal or non-metal ion doping, and narrow bandgap semiconductor recombination have been successfully reported, and all make titanium dioxide nanoflowers in It has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/02C01B3/04B01J35/00
CPCC01B3/042B01J21/063B01J37/0018B01J35/39B01J35/40B01J35/50Y02E60/36
Inventor 胡海华
Owner ZHEJIANG UNIV CITY COLLEGE
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