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Nano-fibre supported titanium dioxide photocatalyst and preparation method thereof

A technology of nanofibers and titanium dioxide, which is applied in the field of preparation of nanophotocatalyst functional materials, can solve the problems of affecting photocatalytic performance, affecting photocatalytic efficiency, narrow wavelength range, etc., achieve excellent photocatalytic activity, improve bonding reliability, method simple effect

Inactive Publication Date: 2009-05-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prepared photocatalyst, the titanium dioxide nanoparticles and the nanofibers are still physically combined, and the bonding reliability between them is not ideal, and the titanium dioxide is easy to fall off, which affects the photocatalytic performance; at the same time, the loaded titanium dioxide has a forbidden band The width is limited, it can only be activated by ultraviolet light but not by visible light, and the applicable wavelength range is narrow, which affects the photocatalytic efficiency

Method used

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  • Nano-fibre supported titanium dioxide photocatalyst and preparation method thereof
  • Nano-fibre supported titanium dioxide photocatalyst and preparation method thereof
  • Nano-fibre supported titanium dioxide photocatalyst and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] A mixed solution of 6 mL of tetrabutyl titanate and 4 mL of acetic acid was added to 60 mL of polyacrylonitrile in dimethylformamide (concentration: 10 wt %), and then stirred under ultrasonic waves until a uniform solution was formed for electrospinning . During the electrospinning process, a No. 12 injection needle (inner diameter of 1.1 m) was selected, the applied electrostatic voltage was 10 kV, the flow rate of the spinning solution was 0.4 mL / h, the receiving distance between the metal cylinder and the needle was 20 cm, and the outer diameter of the cylinder was The line speed is 8m / s, and after 5 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The resulting electrospun nanofiber mat / membrane was subjected to constant-strain thermal stretching at 135 °C for 10 min, and then subjected to constant-strain pre-oxidation at 250 °C for 1 h. Finally, after immersing the nanofiber mat / membrane that has...

Embodiment 2

[0028] A mixed solution of 6 mL of tetrabutyl titanate and 4 mL of acetic acid was added to 60 mL of polyacrylonitrile in dimethylformamide (concentration: 10 wt %), and then stirred under ultrasonic waves until a uniform solution was formed for electrospinning . During the electrospinning process, a No. 12 injection needle (inner diameter of 1.1mm) was selected, the applied electrostatic voltage was 10kV, the flow rate of the spinning solution was 0.4mL / h, the receiving distance between the metal cylinder and the needle was 20cm, and the outer diameter of the cylinder was The line speed is 8m / s, and after 5 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The resulting electrospun nanofiber mat / membrane was subjected to constant-strain thermal stretching at 135 °C for 10 min, and then subjected to constant-strain pre-oxidation at 250 °C for 1 h. Finally, after immersing the nanofiber mat / membrane that has in...

Embodiment 3

[0030] A mixed solution of 6 mL tetrabutyl titanate and 4 mL acetic acid was added to 60 mL polyacrylonitrile in dimethyl sulfoxide solution (concentration: 10 wt%), and then stirred under ultrasonic waves until a uniform solution was formed for electrospinning . During the electrospinning process, a No. 9 injection needle (with an inner diameter of 0.9mm) was selected, the applied electrostatic voltage was 15kV, the flow rate of the spinning solution was 0.3mL / h, the receiving distance between the metal cylinder and the needle was 25cm, and the outer diameter of the cylinder was The line speed is 8m / s, and after 5 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The resulting electrospun nanofiber mat / membrane was subjected to constant-strain thermal stretching at 135 °C for 10 min, and then subjected to constant-strain pre-oxidation at 250 °C for 1 h. Finally, after immersing the nanofiber mat / membrane that...

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Abstract

The invention provides a nanofiber load titanium dioxide photocatalyst and a preparation method thereof, which belong to the technical field of preparation of novel nanometer photocatalyst functional materials. The method comprises the following steps: preparing a homogeneous spinning solution with titanium precursor, a hydrolysis inhibitor, a polymer and an organic solvent; carrying out spinning according to a proper electrostatic spinning process to obtain a nanofiber felt / film; introducing hydroxyl groups into electrospun nanofiber, and immersing the electrospun nanofiber in an aqueous solution containing an ammoniation agent, so that hydrolysis and ammoniation reaction of titanium precursor occurs and produces titanium-ammino complex; and carrying out post treatment processes such as baking and the like to obtain the nanofiber load titanium dioxide photocatalyst. The catalyst has excellent photo-catalytic activity in response to ultraviolet light or visible light, and can effectively improve the bonding reliability of titanium dioxide with nanofiber with the help of the action of nitrogen bond.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-photocatalyst (photocatalyst) functional materials, and relates to a nanofiber-supported titanium dioxide photocatalyst and a preparation method thereof. The prepared catalyst can be used in mineralization treatment of organic pollutants in water and oxidation degradation of indoor air Toxic volatile organic compounds (VOCs), and oxidation kill harmful bacteria and viruses in life. Background technique [0002] Anatase titanium dioxide has excellent photocatalytic activity in the ultraviolet region. It can be used not only to treat organic pollutants in industrial and domestic wastewater to purify water, but also to photocatalytically oxidize and degrade harmful gases in indoor air. It can also kill harmful bacteria and viruses with the help of strong oxidizing groups (·OH) generated by the photocatalysis of titanium dioxide, so it is a photocatalyst with broad application prospects. ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/06D01F1/10D01F6/18D06M13/10D06M11/61D06M13/325
Inventor 于运花滕冬华杨小平
Owner BEIJING UNIV OF CHEM TECH
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