A kind of supported gallium-tin photocatalyst and preparation method thereof

A photocatalyst, supported technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of small specific surface area of ​​catalysts, expensive precious metals, reduced catalyst activity, etc., to improve the photocatalytic reaction. Efficiency, reduced recombination rate, increased contact chance effects

Active Publication Date: 2020-12-08
嘉兴市众盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method improves the catalytic activity of gallium oxide by loading noble metals, but noble metals are expensive and difficult to popularize and use, and there is a problem that the surface of noble metals is easy to deposit carbon, which leads to the reduction of catalyst activity; it directly uses commercial gallium oxide as a carrier to load noble metals, and the prepared catalyst ratio Smaller surface area, less active sites, poor adsorption performance, poor overall catalytic activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add 10mol / L concentrated hydrochloric acid with a volume of 5‰ of absolute ethanol dropwise to absolute ethanol, stir evenly, add tin chloride, and dissolve to obtain a 0.2mol / L tin chloride solution; Add dropwise analytical pure acetic acid with an absolute ethanol volume of 0.1‰, stir well, and then add gallium nitrate to prepare a gallium-tin salt solution. Sn:Ga is 1:10. After stirring well, use sodium hydroxide as an alkali source to adjust the pH to 9.5;

[0028] 2) The equal volume of the gallium-tin salt solution prepared in step 1) was impregnated with MCM mesoporous molecular sieves, and reacted at a constant temperature in a constant temperature water bath shaker at 30°C for 10 hours to prepare a mixed solution containing MCM mesoporous molecular sieves;

[0029] 3) Put the mixed liquid prepared in step 2) in a hydrothermal reaction kettle, seal it and place it in a constant temperature drying box, heat it at 150°C, and after reacting for 5 hours, take out...

Embodiment 2

[0033] 1) Add 10mol / L concentrated hydrochloric acid with a volume of 3‰ of absolute ethanol dropwise to absolute ethanol, stir evenly, add tin sulfate, and dissolve to obtain a 0.5mol / L tin chloride solution; Add 0.08‰ analytically pure acetic acid in anhydrous ethanol dropwise, stir well, add gallium chloride to prepare gallium-tin salt solution, Sn:Ga is 1:15, stir well and use ammonia water as the alkali source to adjust the pH to 8.5 -9.0;

[0034] 2) impregnating equal volumes of the gallium-tin salt solution prepared in step 1) with MCM mesoporous molecular sieves, and reacting at a constant temperature in a constant temperature water bath shaker at 40°C for 8 hours to prepare a mixed solution containing MCM mesoporous molecular sieves;

[0035] 3) Put the mixed liquid described in step 2) in a hydrothermal reaction kettle, seal it and place it in a constant temperature drying box, heat it at 200°C, and after reacting for 3 hours, take out the reaction kettle and cool i...

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PUM

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Abstract

The invention discloses a supported gallium-tin photocatalyst. The photocatalyst is a photocatalysis material prepared by taking an MCM mesoporous molecular sieve as a carrier and loading two active components including SnO2 and GaO2. The photocatalyst prepared by the method disclosed by the invention has a large specific surface area and takes the MCM mesoporous molecular sieve with a certain pore channel structure as the carrier; Sn and Ga double-metal oxide is loaded into the pore channel structure in the MCM mesoporous molecular sieve, so that the contact area between active sites of the active components and a pollutant is extremely enlarged; Ga with a greater forbidden bandwidth is selected and used as the main active component; meanwhile, Sn which has relatively great energy level difference with a Ga conduction band is used as an auxiliary active component, so that the self-made photocatalyst has stronger photocatalysis efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a supported gallium-tin photocatalyst and a preparation method thereof. Background technique [0002] Photocatalytic technology can effectively degrade some refractory organic substances, and its technical feature is that it can deeply degrade refractory organic substances under mild conditions. Titanium dioxide TiO 2 As a commonly used photocatalytic material, it has been extensively studied. gallium oxide Ga 2 o 3 As a wide bandgap semiconductor material, the bandgap width is between 4.2-4.9eV, which is larger than that of TiO 2 3.2eV, from the energy band structure of the semiconductor, Ga 2 o 3 The photocatalytic oxidation / reduction ability is better than that of TiO 2 . with TiO 2 Similarly, under light conditions, Ga 2 o 3 The electron-hole is excited, and the hole has strong oxidizing properties, which can directly oxidize organic matter or re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J29/04C02F1/30C02F101/38
CPCB01J29/0308B01J29/041B01J35/004B01J2229/186C02F1/30C02F2101/40C02F2305/10
Inventor 沈炜
Owner 嘉兴市众盛环保科技有限公司
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