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Energy-converting photocatalysis nanophase material and preparation method thereof

A technology of nanomaterials and energy conversion, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficult washing, difficult promotion, and reduced natural light photocatalytic efficiency, so as to avoid particle agglomeration , the effect of improving utilization efficiency

Inactive Publication Date: 2009-09-23
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the preparation and use of anatase nano-titanium dioxide as a photocatalyst, there are two key technical issues: one is that the band gap of anatase titanium dioxide is 3.2 eV, and the wavelength of light that absorbs energy that matches the band gap is at In the ultraviolet region (λ<387nm), the photocatalytic efficiency in natural light is reduced (the wavelength of sunlight is 460-500nm); the second is in the preparation of anatase nano-titanium dioxide method, if the higher cost of titanic acid is used In the sol-gel method with butyl fat as the raw material, the gel needs to be calcined at 500-600°C to complete the crystallization, and the aggregation of nanoparticles will inevitably occur; if the low-cost titanium tetrachloride hydrolysis method or titanium sulfate precipitation is used preparation method, it is necessary to repeatedly wash the amorphous titanium dioxide (orthotitanic acid sol) and then calcinate and crystallize it at 500-600°C. Very difficult to promote in industrial production
The above-mentioned published patent can certainly reduce the bandgap width of titanium dioxide by doping, so that the matching absorption band can be partially red-shifted to the visible light band, but its defect is that the reduction of the bandgap width will reduce the redox potential of titanium dioxide and weaken its oxidation. ability to decompose organic matter

Method used

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  • Energy-converting photocatalysis nanophase material and preparation method thereof
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  • Energy-converting photocatalysis nanophase material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Put 112mL of analytically pure titanium tetrachloride solution into a three-neck flask, add 388mL of distilled water dropwise in an ice bath, and the temperature does not exceed 20°C. A stock solution of titanium dioxide (solution I) with a concentration of about 2 mol / L was obtained. Get solution I 20mL, weigh 0.0652 grams of ytterbium oxide, 0.0652 grams of erbium oxide, after stirring and dissolving, add 100ml distilled water. It was hydrolyzed at 50°C for 4 hours to obtain a transparent solution. Toluene and trioctylamine (volume ratio: 2:1) were used as the extractant to shake and extract the above hydrolyzed transparent solution for 15 minutes at room temperature. The aqueous phase and the organic phase were separated, and the organic phase was back-extracted with 10% NaOH 20mL at room temperature, and the obtained organic phase could be used repeatedly. Until the pH value of the aqueous phase is 6.5-7. Aging for 24 hours to obtain a transparent anatase-type na...

Embodiment 2

[0023] Take 20 mL of solution I in Example 1, weigh 0.0652 g of ytterbium oxide and 0.0652 g of holmium oxide, stir and dissolve, and then add 80 ml of distilled water. It was hydrolyzed at constant temperature at 60°C for 3 hours to obtain a transparent solution. Toluene and trioctylamine (volume ratio: 2:1) were used as the extractant to shake and extract the above hydrolyzed transparent solution for 15 minutes at room temperature. The aqueous phase and the organic phase were separated, and the organic phase was back-extracted with 10% NaOH 20mL at room temperature, and the obtained organic phase could be used repeatedly. Until the pH value of the aqueous phase is 6.5-7. Aging for 24 hours to obtain a transparent anatase-type nano-titanium dioxide gel, take about 50 grams of the titanium dioxide gel, add it to a hydrothermal reaction kettle, add distilled water to 70% of the reaction kettle, and conduct a hydrothermal reaction at 200°C After 6 hours, cool to room temperatu...

Embodiment 3

[0026]Take 20 mL of solution I in Example 1, weigh 0.0652 g of ytterbium oxide and 0.0652 g of thulium oxide, stir and dissolve, then add 80 ml of distilled water. It was hydrolyzed at 50°C for 4 hours to obtain a transparent solution. Toluene and trioctylamine (volume ratio: 2:1) were used as the extractant to shake and extract the above hydrolyzed transparent solution for 15 minutes at room temperature. The aqueous phase and the organic phase were separated, and the organic phase was back-extracted with 10% NaOH 20mL at room temperature, and the obtained organic phase could be used repeatedly. Until the pH value of the aqueous phase is 6.5-7. After aging for 24 hours, a transparent anatase-type nano-titanium dioxide gel was obtained. Take about 50 grams of the titanium dioxide gel, add it to a hydrothermal reaction kettle, add distilled water to 70% of the reaction kettle, and conduct a hydrothermal reaction After 3 hours, cool to room temperature, open the kettle, separat...

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Abstract

The invention discloses an energy-converting photocatalysis nano material and a preparation method thereof. Firstly, 0.02-3.5 mol.L<-1> titanium tetrachloride is used as the raw material, and one or two oxides of the rare earth elements of Yb, Er, Ho and Tm are mixed with the titanium tetrachloride. The mixed rare earth oxides account for 0.01-20 percent of the total weight. The mixed solution is subject to hydrolysis for 20-480 minutes at a temperature of 20-90 DEG C. Then, the mixed solution is extracted by means of an organic extraction method with organic amine so as to remove the Cl<-> in the solution and obtain anatase type nanometer titanium dioxide gel containing rare earth elements, and the titanium dioxide gel is aged for 2-48 hours. Finally, the titanium dioxide gel undergoes hydrothermal crystallization at a temperature of 120-240 DEG C so as to obtain the nano energy-converting photocatalysis material. In the invention, through energy conversion, part of the visible light, which is absorbed by the anatase type titanium dioxide, is converted into ultraviolet energy to be absorbed, without reducing forbidden gap, thereby improving the utilization rate of the visible light by a titanium dioxide photocatalyst, being capable of realizing the industrialization production of titanium tetrachloride hydrolysis and avoiding particle aggregation possibly generated by high-temperature calcining.

Description

technical field [0001] The invention relates to a preparation method of anatase nano titanium dioxide with photocatalytic activity under visible light. Background technique [0002] Anatase-type titanium dioxide (TiO 2 ) has photocatalytic properties. When the particle size of nano-titanium dioxide is smaller than a certain critical size, the oxidation ability of photogenerated electrons and holes is greatly improved, and most organic substances can be oxidized. At the same time, titanium dioxide has the advantages of stable chemical properties, non-toxic and non-polluting, and is widely used in indoor air purification, harmless treatment of natural water bodies and industrial wastewater. [0003] During the preparation and use of anatase nano-titanium dioxide as a photocatalyst, there are two key technical issues: one is that the band gap of anatase titanium dioxide is 3.2 eV, and the wavelength of light that absorbs energy that matches the band gap is at In the ultraviol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/10B01J37/04B01J37/10A62D3/10A62D101/28
Inventor 陈若愚陈智栋刘小华
Owner JIANGSU POLYTECHNIC UNIVERSITY
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