Preparation method of high-activity SnO2-TiO2 composite nanometer photocatalyst

A nano-photocatalyst and high-activity technology, applied in the field of nano-materials and photocatalysis, can solve the problems of unstable catalyst activity, limited scope of use, and limited scope of use, achieve short reaction period, increase the number of surface oxygen holes, and facilitate the The effect of light absorption

Inactive Publication Date: 2014-04-16
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this kind of two-by-two composite method, there is no fixed operating condition, and the scope of use is relatively limited; at the same time, the activity of the catalyst prepared by the composite method is unstable, the dispersion performance is not good, and the preparation takes a long time. The period is 4~5d, so that the scope of use is still not wide

Method used

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  • Preparation method of high-activity SnO2-TiO2 composite nanometer photocatalyst
  • Preparation method of high-activity SnO2-TiO2 composite nanometer photocatalyst

Examples

Experimental program
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Embodiment 1

[0034]Mix 60ml of tetra-n-butyl titanate, 255ml of absolute ethanol, and 30ml of glacial acetic acid evenly, and add 30ml of dilute nitric acid (nitric acid: water = 1:10) drop by drop under constant stirring to adjust the pH to 3, and continue stirring for 15 minutes. , add 30ml of deionized water, stir for another 10min, then let it stand for 30min, add SnCl with a molar concentration of 1.4mol / L according to the titanium:tin molar ratio of 60:1 4 ·5H 2 O solution, stirred evenly, and aged for 24 hours to slowly polymerize the sol and colloidal particles. Transfer the aged sol to an autoclave and treat it at a constant temperature of 180°C for 24 hours, then cool the product in the autoclave to room temperature, wash the product after cooling with absolute ethanol repeatedly, then perform centrifugation, and dry the product after separation , the drying temperature is 60°C, and the product obtained after drying is ground to obtain SnO 2 -TiO 2 Composite nano photocatalyst...

Embodiment 2

[0036] Mix 57ml of tetra-n-butyl titanate, 266ml of absolute ethanol, and 19ml of glacial acetic acid evenly, and add 57ml of dilute nitric acid (nitric acid: water = 1:10) dropwise under constant stirring to adjust the pH to 3, and continue stirring for 15 minutes. , add 30ml of deionized water, stir for another 10min, then let it stand for 30min, add SnCl with a molar concentration of 1.4mol / L according to the titanium:tin molar ratio of 55:1 4 ·5H 2 O solution, stirred evenly, and aged for 20 hours to slowly polymerize the sol and colloidal particles. Transfer the aged sol to an autoclave and treat it at a constant temperature of 180°C for 22 hours, then cool the product in the autoclave to room temperature, wash the product after cooling with absolute ethanol repeatedly, then perform centrifugation, and dry the product after separation , the drying temperature is 55°C, and the product obtained after drying is ground to obtain SnO 2 -TiO 2 Composite nano photocatalyst. ...

Embodiment 3

[0038] Mix 65ml of tetra-n-butyl titanate, 273ml of absolute ethanol, and 39ml of glacial acetic acid evenly, and add 13ml of dilute nitric acid (nitric acid: water = 1:10) dropwise under constant stirring to adjust the pH value to 3, and continue stirring for 15 minutes. , add 30ml of distilled water, stir for 10min, then let it stand for 30min, add SnCl with a molar concentration of 1.4mol / L according to the titanium:tin molar ratio of 65:1 4 ·5H 2 O solution, stirred evenly, and aged for 28 hours to slowly polymerize the sol and colloidal particles. Transfer the aged sol to an autoclave and treat it at a constant temperature of 180°C for 27 hours, then cool the product in the autoclave to room temperature, wash the product after cooling with absolute ethanol repeatedly, then perform centrifugation, and dry the product after separation , the drying temperature is 65°C, and the product obtained after drying is ground to obtain SnO 2 -TiO 2 Composite nano photocatalyst.

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Abstract

The invention discloses a preparation method of a high-activity SnO2-TiO2 composite nanometer photocatalyst, which comprises the following operating steps: (1) mixing tetrabutyl titanate, tetrabutyl titanate and glacial acetic acid, adding dilute nitric acid and water, stirring, and standing; (2) adding the SnCl4.5H2O solution to the mixed solution, stirring and ageing, wherein the molar ratio of titanium to tin in the mixed solution is (10-80):1; (3) putting the aged substance into an autoclave for constant temperature treatment for 22-27 h, and cooling to the room temperature; (4) using absolute ethyl alcohol to repeatedly wash the obtained cooled product, performing centrifugal separation, drying and grinding the separated product to obtain the high-activity SnO2-TiO2 composite nanometer photocatalyst. According to the invention, the high-activity SnO2-TiO2 composite nanometer photocatalyst is prepared through the sol-solvothermal method; the prepared photocatalyst has high activity, higher purity and excellent dispersity; the operating steps are remarkably reduced to be completed in 2-3 days and even shorter, so that more convenience and safety are realized, the reaction period is shorter and the operating parameter is easy to control.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, and relates to a SnO 2 -TiO 2 Preparation method of composite nano photocatalyst Background technique [0002] TiO 2 Commonly known as titanium dioxide, it is an n-type semiconductor material with a band gap of 3.2eV. Because of its high specific surface area, low cost, non-toxicity, strong photoelectric performance, and high catalytic activity, it has become the most promising photocatalyst at present. However, TiO 2 The inherent physical characteristics of the photocatalyst determine that its utilization rate of solar energy is very low, and the electron-hole recombination rate is high, resulting in a greatly reduced photocatalytic activity. Therefore, by TiO 2 Modification to expand the excitation wavelength from ultraviolet to visible light, slow down the electron-hole recombination, and increase the photocatalytic efficiency has become the research focus of sci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/14
Inventor 董丽辉黄美娜李斌张飞跃范闽光许雪棠
Owner GUANGXI UNIV
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