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N-doped core-shell titanium dioxide with visible-light catalytic activity and preparation method thereof

A titanium dioxide, core-shell technology, applied in the field of preparing N-doped titanium dioxide photocatalyst, can solve problems such as complicated procedures, and achieve the effect of less preparation reagents

Inactive Publication Date: 2017-11-24
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The procedure is complex and requires consumable formwork material

Method used

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  • N-doped core-shell titanium dioxide with visible-light catalytic activity and preparation method thereof

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Experimental program
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Embodiment Construction

[0024] The method for preparing N-doped shell-core titanium dioxide by solvothermal method, the specific implementation method is as follows:

[0025] Add 0.032 mL of diethylenetriamine (commercially available from Sigma, USA) to 50 mL of isopropanol solution under magnetic stirring, continue stirring for 5 minutes, then add 0.1 mL of deionized water, and continue stirring for 10 minutes to make it evenly mixed . Then, under magnetic stirring, 1.5 mL of tetraisopropyl titanate (commercially available from Sigma, USA) was added dropwise to the above solution, and after stirring for 20 minutes, the resulting mixed solution was transferred to a polytetrafluoroethylene-lined reaction kettle . The autoclave was then placed in a muffle furnace and heated to 200°C at a ramp rate of 2°C / min and held at this temperature for 24 hours. After the reaction was completed and cooled to room temperature, the product was centrifuged and rinsed with absolute ethanol, and then vacuum-dried at ...

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Abstract

The invention provides N-doped core-shell titanium dioxide. The N-doped core-shell titanium dioxide has a core-shell structure, wherein the core-shell structure comprises a solid spherical core composed of nano-particles and a hollow outer shell composed of ultrathin nanosheets; a cavity space of 300-500nm is formed between the inner surface of the hollow outer shell and the outer surface of the inner spherical core; and the N-doped mass percentage is 1.5-2.0%. The invention further provides a method for preparing the N-doped core-shell titanium dioxide. The N-doped core-shell titanium dioxide disclosed by the invention has the characteristics that the requirement on a template agent is avoided during preparation of the traditional nanometer material with a complex shape, the preparation process is very simple and convenient, and subsequent heat treatment is not needed.

Description

technical field [0001] The invention relates to a method for preparing N-doped titanium dioxide photocatalyst, in particular to a method for preparing N-doped titanium dioxide photocatalyst with special morphological structure in shell and core shape at one time under the condition of no template by solvothermal method. Background technique [0002] Titanium dioxide, as one of the most promising photocatalysts, has been widely used in environmental catalysis, energy storage, sterilization, photovoltaic cells, sensor devices and many other fields. However, due to its large bandwidth, it can only absorb and utilize ultraviolet light with a wavelength less than 400 nm, and has no catalytic effect under the irradiation of light with a wavelength greater than 400 nm, which limits the ability to absorb and utilize sunlight. Therefore, how to improve its ability to absorb and utilize sunlight so that it can play a catalytic role in a larger wavelength range of irradiated light is v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J21/06B01J37/08
CPCB01J21/063B01J27/24B01J37/08B01J37/086B01J35/396B01J35/39
Inventor 李国良黎刚李洁廖春阳江桂斌
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI