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A preparation method for manganese-modified titanium dioxide nanotubes to enhance photoelectric response

A titanium dioxide, photoelectric response technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of loss of activity, low quantum yield, large energy gap width, etc.

Active Publication Date: 2020-05-12
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] TiO 2 The main disadvantage of photocatalysts is the large energy gap width, and the best performing anatase TiO 2 The energy gap width is 3.2 eV, and only ultraviolet light with a wavelength of less than 387 nm can excite its valence band electrons to the conduction band to generate electron-hole pairs; another disadvantage is that the photogenerated electron-hole pairs are easy to recombine and lose their activity.
These two factors cause the quantum yield in the catalytic reaction process to be low, and must have the irradiation of high-energy ultraviolet light to trigger the photocatalytic reaction, and the ultraviolet light content in sunlight is less than 5%, and the utilization rate of sunlight is low

Method used

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  • A preparation method for manganese-modified titanium dioxide nanotubes to enhance photoelectric response
  • A preparation method for manganese-modified titanium dioxide nanotubes to enhance photoelectric response
  • A preparation method for manganese-modified titanium dioxide nanotubes to enhance photoelectric response

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Experimental program
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Effect test

Embodiment 1

[0031] The first step is pretreatment of titanium sheet. A titanium sheet with a size of 20 mm × 15 mm × 1 mm was cut, and the titanium sheet was polished step by step to 1200# with waterproof sandpaper, cleaned with deionized water and ethanol, and soaked in 0.02 M hydrogen fluoride aqueous solution for 30 s under ultrasonication.

[0032] The second step is constant voltage anodizing. The anodic oxidation electrolyte is a solution system of ammonium fluoride dissolved in glycerol and water, the mass percentage of ammonium fluoride is 0.5%, the volume ratio of glycerol to water is 1:9, and the total mass percentage is 100%. The oxidation voltage was 20V, and the oxidation time was 2 hours, at room temperature.

[0033] The third step is secondary oxidation. After the second step of anodic oxidation, the concentration of Mn(II) ions is 0.05 mol L -1 The secondary oxidation was carried out in aqueous solution, the oxidation voltage was 5 V, and the oxidation time was 5 minut...

Embodiment 2

[0036] The first step is pretreatment of titanium sheet. A titanium sheet with a size of 20 mm × 15 mm × 1 mm was cut, and the titanium sheet was polished step by step to 1200# with waterproof sandpaper, cleaned with deionized water and ethanol, and soaked in 0.02 M hydrogen fluoride aqueous solution for 30 s under ultrasonication.

[0037] The second step is constant voltage anodizing. The anodic oxidation electrolyte is a solution system of ammonium fluoride dissolved in glycerol and water, the mass percentage of ammonium fluoride is 0.5%, the volume ratio of glycerol to water is 1:9, and the total mass percentage is 100%. The oxidation voltage was 20V, the oxidation time was 2 hours, and the oxidation was carried out at room temperature.

[0038] The third step is secondary oxidation. After the second step of anodic oxidation, the concentration of Mn(II) ions is 0.05 mol L -1 The secondary oxidation was carried out in an aqueous solution with an oxidation voltage of 10 V...

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Abstract

The invention relates to the field of material chemistry, in particular to the technical field of photoelectrochemistry and photocatalysis, in particular to a preparation method for a manganese modified titanium dioxide nanotube to enhance a photoelectric response. The preparation method comprises the following basic steps that (1), grinding, cleaning and chemical polishing of a pure titanium sheet are carried out; 2), primary anodization in an ammonium fluoride, glycerol and aqueous solution system is carried out; 3), secondary anodization is carried out in an aqueous solution containing Mn(II) ions; and (4), heat treatment is carried out in an air atmosphere. The preparation method has the beneficial effects that operations are simple, the synergistic composite property between manganeseoxide and titanium dioxide is good, and good doping modification is carried out on titanium dioxide by manganese; and the photoelectrical response performance of a manganese-modified titanium dioxidenanotube array obtained by the preparation method to visible light is enhanced.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to the technical field of photoelectrochemistry and photocatalysis, and in particular to a preparation method for manganese-modified titanium dioxide nanotubes to enhance photoelectric response. Background technique [0002] Human society is facing severe energy shortage and environmental pollution crisis. Hydrogen production by photoelectrochemical hydrolysis can provide clean hydrogen energy products, and photocatalytic degradation of organic pollutants is also considered to be the most promising technology for environmental pollutant treatment. In the above two aspects of research, solar energy stimulates the valence band electrons of semiconductor catalysts to transition to the conduction band, generating electron-hole pairs with good chemical activity, triggering the decomposition of water or the degradation of pollutants. Obviously, semiconductor catalysts occupy an importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06C25D11/26
CPCC25B1/04C25D11/26C25B1/55C25B11/051C25B11/057C25B11/091Y02E60/36
Inventor 司玉军熊中平李敏娇文鲜谢成龙
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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