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Ti<3+>:TiO2/TiF3 composite semiconductor photocatalyst and preparation method thereof

A compound semiconductor and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems that visible light cannot be effectively used, hinders further application, and cannot further improve photocatalytic performance. Achieve good visible light absorption capacity, high commercial application prospects, and good visible light photocatalytic performance

Inactive Publication Date: 2014-07-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary TiO 2 The forbidden band width is 3.2eV, which can only absorb ultraviolet light in sunlight, and cannot effectively use visible light
Meanwhile, anatase TiO 2 The photogenerated carrier recombination rate is very high, resulting in the inability to further improve its photocatalytic performance, hindering its further application in industrialization

Method used

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  • Ti&lt;3+&gt;:TiO2/TiF3 composite semiconductor photocatalyst and preparation method thereof
  • Ti&lt;3+&gt;:TiO2/TiF3 composite semiconductor photocatalyst and preparation method thereof
  • Ti&lt;3+&gt;:TiO2/TiF3 composite semiconductor photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Ti 3+ :TiO 2 / TiF 3 Preparation of composite semiconductor photocatalyst:

[0038] 2.5mmol titanium tetrachloride and 2.5mmol titanium tetrafluoride are completely dissolved in 45ml absolute ethanol, stirred for 5 minutes; then 1.875mmol elemental zinc (R ZT =3:8;R ZT , the molar ratio of the amount of Zn to Ti added), added to the above solution, and after fully stirring for 15 minutes, the solution was poured into a 120ml polytetrafluoroethylene reactor, and the reactor was put into an oven, and kept at 160°C for 32 Hours. After natural cooling, the obtained precipitate was repeatedly washed with absolute ethanol and deionized water three times, and then dried at 50°C.

[0039] figure 1 It is the X-ray diffraction pattern of the product obtained in this embodiment, the top of the figure is the X-ray diffraction peak of the product obtained in the present embodiment, and the bottom part of the figure is the X-ray diffraction of the standard card (JCPDS No.75-...

Embodiment 2

[0043] (1) Ti 3+ :TiO 2 / TiF 3 Preparation of composite semiconductor photocatalyst:

[0044] 2.5 mmol of titanium tetrachloride and 2.5 mmol of titanium tetrafluoride were uniformly and completely dissolved in 45 ml of absolute ethanol, and stirred for 20 minutes. Then 2.5mmol elemental zinc (R ZT =4:8) was added to the above solution and stirred thoroughly for 10 minutes. Pour the solution into a 120ml polytetrafluoroethylene reactor, put the reactor into an oven, and keep the temperature at 180°C for 24 hours. After natural cooling, the obtained precipitate was repeatedly washed with absolute ethanol and deionized water three times, and then dried at 40°C.

[0045] figure 2 It is the X-ray diffraction pattern of the product obtained in this embodiment, as can be seen from the figure, each diffraction peak of this product is the standard card (JCPDS No.21-1272) of anatase phase titanium dioxide and the standard card (JCPDS No. 75-149), there is no miscellaneous peak ...

Embodiment 3

[0049] (1) Ti 3+ :TiO 2 / TiF 3 Preparation of composite semiconductor photocatalyst:

[0050] 2.5 mmol of titanium tetrachloride and 2.5 mmol of titanium tetrafluoride were uniformly and completely dissolved in 45 ml of absolute ethanol and stirred for 15 minutes. Then 3.125mmol elemental zinc (R ZT =5:8) was added to the above solution and stirred thoroughly for 10 minutes. Pour the solution into a 120ml polytetrafluoroethylene reactor, put the reactor into an oven, and keep the temperature at 200°C for 18 hours. After natural cooling, the obtained precipitate was repeatedly washed with absolute ethanol and deionized water three times, and then dried at 60°C.

[0051] Figure 4 It is the X-ray diffraction pattern of the product obtained in this embodiment, as can be seen from the figure, each diffraction peak of this product contains the standard card (JCPDS No.21-1272) of anatase phase titanium dioxide and the standard card (JCPDS No. 75-149), and the diffraction peak...

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Abstract

The invention discloses a Ti<3+>:TiO2 / TiF3 composite semiconductor photocatalyst. According to the photocatalyst, the diameter of titanium dioxide is 10-20nm, the diameter of titanium fluoride is 100-150nm, a type II heterojunction is formed by titanium dioxide and titanium trifluoride, and the photocatalyst has low carrier recombination efficiency, contains lots of trivalent titanium, has high visible light absorption capacity and can be used for degrading organic pollutants. The invention also discloses a method for preparing the composite semiconductor photocatalyst. Elemental zinc serves as a reducing agent, titanium tetrachloride and titanium tetrafluoride serve as raw materials, and Ti<3+>:TiO2 / TiF3 with different ratios of titanium dioxide to titanium trifluoride can be prepared by changing the amount of elemental zinc in different reactions by utilizing alcohol-thermal method synthesis. The preparation method has the advantages of simplicity in operation, low cost and mild synthesis conditions and has high commercial application prospects.

Description

technical field [0001] The present invention relates to a kind of Ti 3+ :TiO 2 / TiF 3 The invention relates to a composite semiconductor photocatalyst and a preparation method thereof, which belong to the field of synthesis of nanometer photocatalytic powder materials. Background technique [0002] Solving energy problems and environmental pollution is the primary task of mankind in the 21st century. The current main energy source is fossil fuels, and the combustion of fossil fuels releases CO 2 , SO 2 , NO 2 Pollutants such as pollutants have seriously damaged our living environment and caused an increasingly serious greenhouse effect. Therefore, finding an environmentally friendly, clean and efficient renewable alternative energy source is very important for the development of society. As an inexhaustible free energy source, solar energy is an ideal energy supply to solve the above problems. Semiconductor photocatalysis technology is a new discipline, which uses so...

Claims

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Application Information

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IPC IPC(8): B01J27/135A62D3/17A62D101/28
Inventor 张晓阳孟晓东黄柏标秦晓燕
Owner SHANDONG UNIV
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