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Method for preparing visible light-inducing stannum-doped highly catalytic nano photocatalyst of titanium dioxide

A nano-titanium dioxide, high catalytic activity technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. The effect of improving the photocatalytic degradation rate and improving the photocatalytic activity

Inactive Publication Date: 2006-07-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Constrained TiO 2 The bottleneck of the practical application of photocatalyst: one is the limitation of the excitation wavelength, due to the 2 The forbidden band width is 3.2eV, and the corresponding excitation wavelength is 387nm, which belongs to the ultraviolet region, and ultraviolet light accounts for less than 5% of solar energy. The most economical and practical photocatalyst material should be able to use the abundant visible light part of sunlight. to replace expensive artificial ultraviolet light sources; the second is TiO 2 The high probability of rapid recombination of semiconductor photogenerated electrons and photogenerated holes, and the low interfacial transfer rate of the generated photogenerated current limit the TiO 2 Photocatalytic Activity of Photocatalyst
[0004] suspended phase TiO 2 Particles are easy to aggregate in aqueous solution, difficult to recycle, and the loss of active components is large, which also seriously limits the practical application of photocatalytic technology

Method used

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  • Method for preparing visible light-inducing stannum-doped highly catalytic nano photocatalyst of titanium dioxide
  • Method for preparing visible light-inducing stannum-doped highly catalytic nano photocatalyst of titanium dioxide
  • Method for preparing visible light-inducing stannum-doped highly catalytic nano photocatalyst of titanium dioxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First drop 17ml of tetrabutyl titanate into 23ml of absolute ethanol, continue magnetic stirring, then slowly add 11ml of acetylacetone as a complexing agent, and obtain a uniform solution a after full reaction; add 2.00g of SnCl 4 ·5H 2 O was dissolved in 47ml of absolute ethanol, then 2ml of distilled water and 0.4ml of nitric acid were added dropwise, and magnetically stirred to obtain a uniform solution b. The reaction temperature is controlled at 30°C, and the solution b is slowly added dropwise to the solution a to carry out the hydrolysis reaction. The Sn that will eventually form 4+ Ion-doped TiO 2 The sol was sealed and aged at room temperature.

[0020] Immerse the pretreated clean glass tube (1cm×2.5cm) into the prepared sol solution at a speed of 4cm / min and let it stand for 2min. After the liquid level is stable, pull it vertically upward at the same pulling speed, and the wet film Place it at room temperature for 5 minutes, then dry it in a vacuum oven...

Embodiment 2

[0023] The process step of this embodiment is basically the same as that of embodiment 1, the difference is that the SnCl 4 ·5H 2 The doping amount of O was 1.30 g. The photocatalytic activity test test shows that the 7.42% Sn of the present embodiment 4+ Doped TiO 2 The photocatalytic degradation rate of the photocatalyst film to the methyl orange solution was 74.63%.

Embodiment 3

[0025] The process step of this embodiment is basically the same as that of embodiment 1, the difference is that the SnCl 4 ·5H 2 The doping amount of O is 0.70 g. The photocatalytic activity test test shows that the 3.99% Sn of the present embodiment 4+ Doped TiO 2 The photocatalytic degradation rate of the photocatalyst film to the methyl orange solution was 67.72%.

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Abstract

The invention provides a method for preparing visible light-induced high catalysis activity tin-doping nanometer titanium oxide photo-catalyst, belonging to the photo-catalyst material technique. It comprises following steps: first preparing tin-doping TiO2 sol; then, preparing tin-doping TiO2 film. The invention comprises the advantages that the prepared nanometer TiO2 film doping with Sn4+ has the duplex grain structure between anatase and red schorl; the average size of crystal grain ranges between 25-30nm, while the red schorl is formed by solid solving the Sn4+ into TiO2 crystal lattice; the surface of transparent film is smooth with a certain coarseness; the absorption band to incident light of TiO2 photo-catalyst film is removed to visible light band by doping Sn4+ to improve the visible light-induced photo-catalyst. The photo-catalyst activity is presented as the photo-catalyst degradation rate of helianthin and doping Sn4+ in right amount can effectively improve the photo-catalyst activity of TiO2 film, while compared with absolute nanometer TiO2 film, its photo-catalyst degradation rate of helianthin is improved more than 34%.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst materials, and in particular provides a preparation method of a tin-doped nano-titanium dioxide photocatalyst with high catalytic activity induced by visible light. Background technique [0002] Nanoscale titanium dioxide is an inorganic new material in the field of environmental protection, and it is also the most promising green photocatalyst material. It degrades harmful pollutants through photocatalytic redox effect without secondary pollution. It has the functions of wastewater treatment, air purification, killing viruses and cancer cells, antibacterial, deodorizing, and self-cleaning. [0003] Constrained TiO 2 The bottleneck of the practical application of photocatalyst: one is the limitation of the excitation wavelength, due to the 2 The forbidden band width is 3.2eV, and the corresponding excitation wavelength is 387nm, which belongs to the ultraviolet region, and ultraviolet ligh...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J21/06
Inventor 徐利华邸云萍王缓
Owner UNIV OF SCI & TECH BEIJING
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