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A tio2 hierarchical structure with visible light response and its preparation method

A hierarchical structure, visible light technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, physical/chemical process catalysts, etc., can solve the problems of low photoelectric energy conversion efficiency, low visible light response, etc. Uniform appearance, large specific surface area and low cost

Inactive Publication Date: 2019-03-22
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: the purpose of the present invention is to overcome the deficiencies in the prior art, to provide a visible light response TiO 2 Fabrication of hierarchical nanostructures to address the current conventional TiO 2 Problems such as low visible light response and low photoelectric energy conversion efficiency of materials

Method used

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  • A tio2 hierarchical structure with visible light response and its preparation method
  • A tio2 hierarchical structure with visible light response and its preparation method
  • A tio2 hierarchical structure with visible light response and its preparation method

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preparation example Construction

[0031] TiO with visible light response of the present invention 2 The preparation method of hierarchical structure, concrete steps are as follows:

[0032] (a) dissolving acetic acid and fluoride salts with a mass ratio of 12:0.22 to 12:0.26 in water to form a clear aqueous solution as reaction raw materials; the mass percentage concentration of the acetic acid is 57%-59%; the mass percentage of the fluoride salts The concentration is 1.0%-1.2%; the fluoride salt is ammonium fluoride, sodium fluoride, or potassium fluoride;

[0033] (b) adding tetra-n-butyl titanate with a mass percentage concentration of 1.6%-2.0% into the clear aqueous solution dropwise, and continuously stirring evenly;

[0034] (c) Transfer the aqueous solution added dropwise with tetra-n-butyl titanate into a hydrothermal reaction kettle, put it into an oven, raise the temperature to 140-180°C, and keep it warm for a period of time, which is more than 8 hours;

[0035] (d) Take out the precipitated subs...

Embodiment 1

[0038] Dissolve 0.24g of ammonium fluoride in 8mL of water, then add 12mL of acetic acid, stir for 5min to make it uniform, then slowly drop in 0.5mL of tetra-n-butyl titanate and keep stirring for 5min, then pour the obtained solution into polytetrafluoroethylene Put it into a 35mL reaction kettle composed of a vinyl liner and a stainless steel shell, and put it in an oven at 160°C for 9 hours; after natural cooling, take out the precipitate, centrifuge, wash, and dry; finally, put the obtained white powder in Sintered at 400 °C for 1.5 h in a muffle furnace to obtain yellow TiO with visible light response 2 Nanomaterials; the macroscopic and microscopic morphological characteristics of the material are as follows: figure 1 shown; the nanostructure is composed of a series of single crystal flakes in the shape of a "rose flower", figure 2 , image 3 As shown; there is a small amount of F element in the lattice, and the F element is due to the diffusion of F in the impurity ...

Embodiment 2

[0040]Dissolve 0.71g of ammonium fluoride in 24mL of water, then add 36mL of acetic acid, stir for 5min to make it uniform, then slowly drop in 1.5mL of tetra-n-butyl titanate and keep stirring for 10min, then pour the obtained solution into polytetrafluoroethylene Put it into a 100mL reaction kettle composed of a vinyl liner and a stainless steel shell, and put it in an oven at 140°C for 12 hours; after natural cooling, take out the precipitate, centrifuge, wash, and dry; then place the white powder obtained Sintered at 450 °C for 2 h in a muffle furnace to obtain yellow TiO with visible light response 2 nanomaterials.

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Abstract

The invention relates to a preparation method of a TiO2 grading structure with visible light response, and belongs to a preparation method of a semiconductor photocatalysis and photoelectric chemical material. According to the method, firstly, villiaumite is dissolved in water; acetic acid is dropwise added into the villiaumite water solution; continuous stirring is performed; then, tetra-n-butyl titanate is dropwise added into an obtained mixed solution, and continuous stirring is performed; the mixed solution is put into a hydrothermal reaction kettle; the temperature is raised to 140 to 180 DEG C, enabling the reaction to be performed for 8 to 16h; after the reaction kettle is naturally cooled, precipitates are taken out; centrifugation or filtering, washing and drying are performed; the temperature is raised to 300 to 550 DEG C in air atmosphere; heat insulation sintering is performed for 0.5 to 3h. The prepared TiO2 grading nanometer structure has the advantages of large specific surface area, visible light response, single-crystal structure and the like, and is suitable for being applied to the fields of photocatalytic degradation of pollutant, photoelectrocatalysis water decomposition hydrogen production and the like. The preparation method has the advantages that the method is simple and nontoxic; the operation is easy; the cost is low; the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a semiconductor photocatalytic material, especially a TiO with visible light response 2 Preparation methods of hierarchical nanomaterials. Background technique [0002] As a green, clean and abundant renewable energy, the application prospect of solar energy is very promising, and the efficient use of solar energy has also become a concern of the world. Traditional solar energy utilization methods mainly include photothermal and photovoltaic, among which photovoltaic has better utilization efficiency and the best commercialization prospect. At present, low-cost photovoltaic technologies are worthy of attention, such as dye-sensitized solar cells and perovskite solar cells. These low-cost photovoltaic technologies all require the use of TiO 2 This semiconductor photocatalytic material has the advantages of stable performance, low cost, large specific surface area and high activity. In addition to phot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C01G23/08B01J21/06B01J35/10B82Y30/00
CPCB01J21/063B01J35/004B01J35/1004C01G23/053C01G23/08C01P2002/72C01P2002/80C01P2002/84C01P2002/85C01P2004/03C01P2006/12
Inventor 顾修全何容赵宇龙强颖怀隋美
Owner CHINA UNIV OF MINING & TECH
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