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Porous flower-petal-shaped anatase TiO2 nano-crystal thin film and preparation method thereof

A nanocrystalline, petal-shaped technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of uneven composite degree, restriction of photocatalytic performance, secondary pollution, etc. The effect of controllable appearance, fast electron migration speed, and low photogenerated electron-hole recombination rate

Active Publication Date: 2018-12-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, TiO 2 Due to the extremely high recombination rate of electron-hole pairs of nanomaterials, its photocatalytic performance is seriously restricted.
Currently, commonly used TiO 2 Modification methods include noble metal deposition, narrow-bandgap semiconductor recombination, and ion doping, but these modification methods have their own defects, such as expensive, uneven recombination, and secondary pollution.

Method used

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  • Porous flower-petal-shaped anatase TiO2 nano-crystal thin film and preparation method thereof
  • Porous flower-petal-shaped anatase TiO2 nano-crystal thin film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] A kind of porous petal-shaped anatase TiO of the present embodiment 2 Preparation of nanocrystals, the preparation process is:

[0021] (1) Ultrasonic cleaning is performed on the titanium sheet. The specific cleaning process is as follows: ultrasonic cleaning in acetone for 30 minutes, ultrasonic cleaning in deionized water for 10 minutes, ultrasonic cleaning in alcohol for 20 minutes, and ultrasonic cleaning in deionized water for 10 minutes. After that, the cleaned The titanium sheets were dried and stored in an oven at 40°C.

[0022] (2) The concentration of HF acid solution used for hydrothermal synthesis is 10mmol / L, and its solvent is a mixed solvent of ethylene glycol and water, and the volume ratio of ethylene glycol and water is 1:7.

[0023] (3) Put the titanium sheet in step (1) in the polytetrafluoroethylene reactor containing the HF acid solution prepared in step (2) for hydrothermal reaction, wherein: the hydrothermal temperature is 160°C, and the hydrot...

Embodiment 2

[0027] The preparation method of this embodiment is the same as that of Example 1, except that the volume ratio of ethylene glycol and water in step (2) is 1:5, and the porous petal-shaped anatase TiO prepared in this embodiment 2 Nanocrystalline, after testing, its photocurrent density reaches 48.25μA / cm 2 .

Embodiment 3

[0029] The preparation method of this embodiment is the same as that of Example 1, except that the volume ratio of ethylene glycol and water in step (2) is 1:10, and the porous petal-shaped anatase TiO prepared in this embodiment 2 Nanocrystalline, after testing, its photocurrent density reaches 44.34μA / cm 2 .

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Abstract

The invention relates to the technical field of preparation of nano-materials and photoelectrochemistry and in particular discloses a porous flower-petal-shaped anatase TiO2 nano-crystal thin film anda preparation method thereof. The porous flower-petal-shaped anatase TiO2 nano-crystal thin film is prepared by adopting hydrothermal synthesis and high-temperature crystallization methods; the prepared thin film is composed of porous TiO2 nano-crystals and has the advantages of large specific surface area and low compounding probability of photoelectron cavities; the TiO2 nano-crystal thin filmis an anatase phase and has a strong photoelectron cavity oxidization capability; the TiO2 nano-crystal thin film is obtained by direct hydrothermal growth of a Ti substrate and is combined with the substrate very well; the TiO2 nano-crystal thin film has relatively low charge migration resistance and the thin film does not easily fall off.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation and photoelectrochemical technology, and specifically discloses a porous petal-shaped anatase TiO 2 Preparation of nanocrystals and methods for their preparation. Background technique [0002] TiO 2 It is a commonly used semiconductor nanomaterial. Since it was discovered to have a photocatalytic effect in 1972, TiO 2 Because of its high photocatalytic activity, good physical and chemical stability, and biological non-toxicity, it has been widely studied by scientific researchers. TiO 2 Under the irradiation of ultraviolet light, the electrons (e - ) is excited and jumps to its conduction band (CB), leaving a hole in the valence band (h + ), the two form photogenerated electron-hole pairs. Part of the generated photo-generated electrons are captured by dissolved oxygen in water to generate strong oxidizing superoxide ions ( O 2 - ); the hole itself is also highly oxidizing, and it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/04B01J37/10
CPCB01J21/063B01J37/10B01J35/30B01J35/23B01J35/56B01J35/59B01J35/39
Inventor 张勇庞亚俊冯强徐光青吕珺吴玉程
Owner HEFEI UNIV OF TECH
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