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Graded mixed crystal TiO2 micro-nanomaterial, preparation method and application of micro-nanomaterial

A micro-nano, mixed crystal technology, applied in the field of photocatalysis, to achieve mild reaction conditions, environmental friendliness, and good dispersibility.

Active Publication Date: 2013-05-01
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing studies usually only consider unilateral factors on TiO 2 The influence of photocatalytic performance, there are few studies combining the advantages of the two properties

Method used

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  • Graded mixed crystal TiO2 micro-nanomaterial, preparation method and application of micro-nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Add 0.04mol / L tetrabutyl titanate dropwise to a mixed solution of 50mL ethanol and 80mL water, mix well, and obtain a sol after standing for 10 hours;

[0057] (2) Condensate the sol in step (1) with 0.4mol / L hydrochloric acid in an oil bath at 100°C for 22 hours to obtain a white emulsion;

[0058] (3) centrifuging the white emulsion in step (2), washing and drying in an oven, and calcining in a muffle furnace at 300°C;

[0059] (4) Disperse the white powder in step (3) in 7mol / L NaOH aqueous solution, and place it in a reaction kettle for hydrothermal reaction at 150°C for 5 hours;

[0060] (5) After the reaction is completed, the obtained white precipitate is centrifuged, washed to a pH value of 7, and then dried to obtain graded mixed crystal TiO 2 micro-nano materials.

[0061] figure 1 , figure 2 Shown is the graded mixed crystal TiO prepared in Example 1 2 SEM images of micro-nano materials at different magnifications. It can be seen from the figure tha...

Embodiment 2

[0063] (1) Add 0.04mol / L tetrabutyl titanate dropwise to a mixed solution of 50mL ethanol and 80mL water, mix well, and obtain a sol after standing for 10 hours;

[0064] (2) Condensate the sol of step (1) and 0.5mol / L hydrochloric acid in an oil bath at 100°C for 22 hours to obtain a white emulsion;

[0065] (3) centrifuging the white emulsion in step (2), washing and drying in an oven, and calcining in a muffle furnace at 300°C;

[0066] (4) Disperse the white powder in step (3) in 7mol / L NaOH aqueous solution, and place it in a reaction kettle for hydrothermal reaction at 150°C for 5 hours;

[0067] (5) After the reaction is completed, the obtained white precipitate is centrifuged, washed to a pH value of 7, and then dried to obtain graded mixed crystal TiO 2 micro-nano materials.

[0068] Figure 5 Shown is the graded mixed crystal TiO prepared in Example 2 2 The SEM image of the micro-nano material, it can be seen from the figure that the diameter of the flower-shaped...

Embodiment 3

[0070] (1) Add 0.04mol / L tetrabutyl titanate dropwise to a mixed solution of 50mL ethanol and 50mL water, mix well, and obtain a sol after standing for 12 hours;

[0071] (2) Condensate the sol in step (1) with 0.4mol / L hydrochloric acid in an oil bath at 100°C for 24 hours to obtain a white emulsion;

[0072] (3) centrifuging the white emulsion in step (2), washing and drying in an oven, and calcining in a muffle furnace at 300°C;

[0073] (4) Disperse the white powder in step (3) in 7mol / L NaOH aqueous solution, and place it in a reaction kettle for hydrothermal reaction at 150°C for 5 hours;

[0074] (5) After the reaction is completed, the obtained white precipitate is centrifuged, washed to a pH value of 7, and then dried to obtain graded mixed crystal TiO 2 micro-nano materials.

[0075] The SEM image shows that the diameter of the flower-shaped microsphere is about 3 μm, and it is composed of a nanowire basic structure. The diameter of the nanowire is about 15 nm, and...

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Abstract

The invention belongs to the field of inorganic micro-nanomaterial preparation, and relates to a graded mixed crystal TiO2 micro-nanomaterial, a preparation method and an application of the micro-nanomaterial. The flower-shaped graded mixed crystal TiO2 micro-nanomaterial formed by nano lines as base structures by using a collosol-gel method and a hydrothermal method. The diameter of a flower-shaped structure is 2-4 micrometers, the diameter of each one-dimensional nano line is 10-30nm, the length of each nano line is 0.9-2 micrometers, and the graded mixed crystal TiO2 micro-nanomaterial is a mixed crystal of anatase and rutile at different ratios. The graded mixed crystal TiO2 micro-nanomaterial can be used for the field of photocatalysis, and has higher adsorbability and photocatalytic activity than Degussa P25 in degrading a methylene blue dye.

Description

technical field [0001] The invention relates to a graded mixed crystal TiO 2 Micro-nano material, preparation method and application thereof, especially related to a graded mixed-crystal TiO assembled by one-dimensional nanowires, whose crystal form is mixed crystal form of anatase and rutile 2 Micro-nano materials, preparation methods, and their applications in the field of photocatalysis. Background technique [0002] TiO 2 Due to the advantages of good stability, high photocatalytic efficiency and environmental friendliness, semiconductor materials have been widely used in pigments, coatings, cosmetics, environmental protection, new energy and other fields since the beginning of the last century, especially for their excellent photocatalytic properties. , making people think about TiO 2 research is gaining more and more attention. [0003] Previous studies have found that TiO 2 The photocatalytic activity is mainly related to factors such as its crystal form, morphol...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J21/06
CPCC01G23/053B01J21/06B01J37/033B01J21/063C01P2002/72C01P2004/03C01P2004/45C01P2004/61B01J35/60B01J35/40B01J35/39
Inventor 朴玲钰解英娟吴志娇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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