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Titanium dioxide photocatalytic material as well as preparation method and application thereof

A photocatalytic material, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, chemical instruments and methods, etc., can solve the problems of confinement, rapid recombination of electron-hole pairs, light absorption limitation, etc., to reduce the recombination rate , rich surface defects, convenient and simple operation process

Inactive Publication Date: 2021-08-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 There are two major defects, one is that the light absorption is limited to the ultraviolet region, and the other is the rapid recombination of electron-hole pairs, which limits its practical application.

Method used

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  • Titanium dioxide photocatalytic material as well as preparation method and application thereof
  • Titanium dioxide photocatalytic material as well as preparation method and application thereof
  • Titanium dioxide photocatalytic material as well as preparation method and application thereof

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preparation example Construction

[0029] A kind of preparation method of titanium dioxide photocatalytic material of the present invention, comprises the steps:

[0030] Step 1: TiCl 3 As a titanium source, disperse in the solvent, stir at room temperature to dissolve, and the stirring time is 0.5-1h. This step uses dilute hydrochloric acid solution of titanium trichloride, TiCl 3 The added amount is 1.435-5.74mL, the solvent is absolute ethanol, and the volume is 30-40mL;

[0031] The relevant description of titanium trichloride dilute hydrochloric acid solution is as follows figure 1 shown;

[0032] Step 2: transfer the solution obtained in the first step into the inner lining of the reaction kettle, put it into an oven for reaction, and raise the temperature to 180-220°C for 5-24 hours;

[0033] Step 3: Cool naturally to room temperature after the reaction, collect the obtained product for centrifugation, wash with ethanol, and dry at 60-70°C for 3-5 hours to obtain white powder TiO 2 .

[0034] The wh...

Embodiment 1

[0037] A kind of preparation method of titanium dioxide photocatalytic material of the present invention, comprises the steps:

[0038] Weigh 2.87mLTiCl 3 Dissolve in 30mL of absolute ethanol, stir at room temperature for 30 minutes to completely dissolve, and transfer the obtained solution into the lining of the reaction kettle.

[0039] Put it into an oven and raise the temperature to 220° C., keep it warm for 6 hours, and then cool it down to room temperature naturally. The resulting reactants were collected, washed with absolute ethanol and centrifuged and dried at 60°C for 3 hours to obtain white TiO 2 Powder.

[0040] figure 2 is TiO 2 The X-ray diffraction spectrum (XRD) of powder, all diffraction peaks all and TiO 2 The standard card (PDF#21-1272) is completely consistent without any miscellaneous peaks, indicating that the synthesized TiO 2 The powder is a pure phase. Synthetic TiO 2 The XRD diffraction peaks of the powder show that the sample has a high degr...

Embodiment 2

[0045] A kind of preparation method of titanium dioxide photocatalytic material of the present invention, comprises the steps:

[0046] Weigh 1.435mL TiCl3 Dissolve in 30mL of absolute ethanol, stir at room temperature for 30 minutes to completely dissolve, and transfer the obtained solution into the lining of the reaction kettle.

[0047] Put it into an oven and raise the temperature to 220° C., keep it warm for 6 hours, and then cool it down to room temperature naturally. The resulting reactants were collected, washed with absolute ethanol and centrifuged, then dried at 60°C for 3 hours to obtain white TiO 2 Powder.

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Abstract

The invention provides a titanium dioxide photocatalytic material and a preparation method and application thereof. The method comprises the following steps: dissolving a diluted hydrochloric acid solution of titanium trichloride in absolute ethyl alcohol, wherein the volume ratio of the solution to the absolute ethyl alcohol is (1.435-5.74): (30-40), thereby preparing a precursor solution; carrying out hydrothermal treatment on the precursor solution for 5-12 hours to obtain a reaction solution; and cooling the reaction liquid, separating a product, and sequentially cleaning with ethanol and drying to obtain the titanium dioxide photocatalytic material. The TiO2 material has abundant surface defects and a large specific surface area, and the forbidden bandwidth of the material is reduced, so that the light absorption of the material is expanded to a visible region, and the reaction active sites on the surface of the material are increased; the surface defects can capture photo-induced electrons, so that the recombination rate of photo-induced carriers is reduced; thereby, more reaction active species are generated, so that the performance of photocatalytic hydrogen production and removal of NO in air is improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, in particular to a titanium dioxide photocatalytic material and its preparation method and application. Background technique [0002] Since the past few decades, hydrogen production has received extensive attention as a future energy source with the potential to replace expensive and polluting fossil fuels. Hydrogen production methods can be divided into two types: renewable and non-renewable. Photoelectrolysis and photocatalytic water splitting are renewable methods, while steam reforming and gasification are non-renewable methods. Environmental pollution has destroyed the ecological environment of human beings and brought many potential hazards to human existence. Air pollution brings the most direct harm to human beings, among which nitrogen oxides are the most harmful and most difficult air pollutants to deal with. one. Among the many atmospheric pollutants, nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C01B3/04B01D53/86B01D53/56C01G23/053
CPCB01J21/063C01B3/042B01D53/8628C01G23/0536C01B2203/0277C01P2002/72C01P2004/03B01J35/39Y02E60/36
Inventor 张荔同若冰杨艳玲侯小江冯雷锁国权叶晓慧
Owner SHAANXI UNIV OF SCI & TECH
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