Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Preparation method of SnO2-TiO2 composite nano photocatalyst

A nano-photocatalyst and dilute nitric acid technology, applied in the field of nano-materials and photocatalysis, can solve the problems of low catalyst activity, large amount of smoke, dangerous reaction process, etc., and achieve good catalyst repeatability, good repeatability and short reaction cycle. Effect

Inactive Publication Date: 2014-03-26
GUANGXI UNIV
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] These methods have been reported in the literature to prepare SnO 2 -TiO 2 Composite nano photocatalysts, but the activity of the catalysts prepared by these methods is not high, which makes the reaction effect not good; when the catalyst is prepared by the precipitation method or the hydrothermal method alone, the precursor used is titanium tetrachloride, titanium tetrachloride When thermally decomposed, the reaction is violent, and a large amount of dense smoke occurs, which makes the reaction process more dangerous; the prior art prepares SnO 2 -TiO 2 Surfactants and other substances need to be added to the composite catalyst, resulting in high production costs. At the same time, it usually takes 4-5 days to prepare the catalyst, which is too long

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of SnO2-TiO2 composite nano photocatalyst
  • Preparation method of SnO2-TiO2 composite nano photocatalyst
  • Preparation method of SnO2-TiO2 composite nano photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 6ml of tetra-n-butyl titanate, 25ml of absolute ethanol, and 1.5ml of glacial acetic acid, and add 3ml of dilute nitric acid (nitric acid: water = 1:10) drop by drop under continuous stirring to adjust the pH value to 3, and continue stirring for 15 minutes Finally, add 3ml of deionized water, stir for another 10min, then let it stand for 30min, then add 4ml of SnCl with a molar concentration of 1.4mol / L according to the titanium:tin molar ratio of 3:1 4 ·5H 2 O solution, stirred evenly, and aged for 24 hours to slowly polymerize the sol and colloidal particles. The aged sol was transferred to an autoclave and treated at a constant temperature of 180°C for 24 hours, then the product in the autoclave was cooled to room temperature, and the obtained product was centrifuged, dried at 100°C after separation, and then ground into powder. Labeled s-hyth. The powder is calcined in a muffle furnace at 550°C for 4 hours to obtain SnO 2 -TiO 2 solid solution.

Embodiment 2

[0039] Mix 6ml of tetra-n-butyl titanate, 28ml of absolute ethanol, and 2.0ml of glacial acetic acid, and add 3ml of dilute nitric acid (nitric acid: water = 1:10) drop by drop under constant stirring to adjust the pH value to 2, and continue stirring for 15 minutes Finally, add 1ml of deionized water, stir for 10min, then let it stand for 30min, according to the titanium: tin molar ratio of 3:1, add 4ml of SnCl with a molar concentration of 1.4mol / L 4 ·5H 2 O solution, stirred evenly, and aged for 22 hours to slowly polymerize the sol and colloidal particles. The aged sol was transferred to an autoclave and treated at a constant temperature of 175°C for 22 hours, then the product in the autoclave was cooled to room temperature, and the obtained product was centrifuged, dried at 95°C after separation, and then ground into powder. The powder is calcined at 500°C for 6h in a muffle furnace to obtain SnO 2 -TiO 2 solid solution.

Embodiment 3

[0041] Mix 12.5ml of tetra-n-butyl titanate, 52.5ml of absolute ethanol, and 2.5ml of glacial acetic acid evenly, and add 2.5ml of dilute nitric acid (nitric acid: water = 1︰10) dropwise under constant stirring to adjust the pH value to 4. After continuing to stir for 15 minutes, add 7.5ml of distilled water, stir for another 10 minutes, and then let it stand for 30 minutes. According to the titanium: tin molar ratio of 3:1, add 4ml of SnCl with a molar concentration of 1.4mol / L 4 ·5H 2 O solution, stirred evenly, and aged for 26 hours to slowly polymerize the sol and colloidal particles. The aged sol was transferred to an autoclave and treated at a constant temperature of 185°C for 25 hours, then the product in the autoclave was cooled to room temperature, and the obtained product was centrifuged, dried at 110°C after separation, and then ground into powder. The powder is calcined in a muffle furnace at 600°C for 2 hours to obtain SnO 2 -TiO 2 solid solution.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A preparation method of a SnO2-TiO2 composite nano photocatalyst comprises operation steps as follows: (1), mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, adding dilute nitric acid to regulate pH, stirring and adding water; (2) adding a SnCl4*5H2O solution into the mixed solution in a molar ratio of titanium to tin to be 3:1, stirring, and aging for 22-26 h; (3) placing the aged material into an autoclave for treatment for 22-25 h at the temperature of 175-185 DEG C, and cooling the material in the autoclave to the room temperature; and (4) performing centrifugal separation on a product, then drying the product at 95-110 DEG C and roasting the product for 2-6 h to obtain a finished product. The SnO2-TiO2 composite nano photocatalyst prepared with the method has higher purity and activity, good dispersibility, high thermostability and good repeatability; the method does not require addition of a surfactant and the like, so that the cost is lower, and the production cost is reduced greatly; and meanwhile, the production time is shortened to 2-3 d, and further, the operation is simple and safe.

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 sc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/14B82Y30/00
Inventor 董丽辉黄美娜李斌张飞跃范闽光许雪棠
Owner GUANGXI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products