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Metal nanoparticle/silicon dioxide composite light catalyst responded by visible light-near-infrared light

A technology of metal nanoparticles and silicon dioxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, oxidation to prepare carbonyl compounds, etc., can solve the problems of unfavorable utilization efficiency of metal atoms, and achieve Excellent photocatalytic activity, high catalytic efficiency, simple preparation method

Active Publication Date: 2019-01-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods will reduce the exposure of active sites to a certain extent, which is not conducive to improving the utilization efficiency of metal atoms.

Method used

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  • Metal nanoparticle/silicon dioxide composite light catalyst responded by visible light-near-infrared light
  • Metal nanoparticle/silicon dioxide composite light catalyst responded by visible light-near-infrared light
  • Metal nanoparticle/silicon dioxide composite light catalyst responded by visible light-near-infrared light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) SiO 2 Preparation: Add 2 ml tetraethyl silicate (TEOS) to 40 ml isopropanol, then add 1.4 ml ammonia water (NH 3 ·H 2 O), after reacting at room temperature for 4 h, the product was centrifuged, washed with ethanol and water, and dried at 60 °C to obtain spherical SiO 2 ;

[0034] (2) SiO 2 Modification: 200 mg of the obtained SiO 2 Disperse in 200 ml of ethanol, add 2 ml of 3-aminopropyltriethoxysilane (APTES), react at 60 °C for 4 h, centrifuge and wash to obtain SiO with a particle size of 450 nm and a positively charged surface 2 Microspheres;

[0035] (3) Preparation of Au NPs: Add 50 ml 0.4 mM chloroauric acid (HAuCl 4 ) solution, mix and add 5 ml of 12 mM sodium borohydride (NaBH 4 ), reacted for 2 h at room temperature to obtain AuNPs solution;

[0036] (4) Au / SiO2 2 Preparation: SiO obtained after modification 2 The microspheres were mixed with a certain amount of Au NPs solution and stirred for 2 h, and Au-SiO with Au NPs loadings of 0.5%, 1%, 2%...

Embodiment 2

[0040] (1) SiO 2 Preparation: Add 2 ml tetraethyl silicate (TEOS) to 40 ml isopropanol, add 0.4, 0.8, 1.2, 1.6, 1.8, 2 ml ammonia water (NH 3 ·H 2 O), after reacting at room temperature for 4 h, the product was centrifuged, washed with ethanol and water, and dried at 60 °C to obtain spherical SiO 2 ;

[0041] (2) SiO 2 Modification: 200 mg of the obtained SiO 2 Disperse in 200 ml of ethanol, add 2 ml of 3-aminopropyltriethoxysilane (APTES), react at 60 °C for 4 h, centrifuge and wash to obtain SiO with a particle size of 300-600 nm and a positively charged surface 2 Microspheres;

[0042] (3) Preparation of Au NPs: Add 50 ml 0.4 mM chloroauric acid (HAuCl 4 ) solution, mix and add 5 ml of 12 mM sodium borohydride (NaBH 4 ), reacted for 2 h at room temperature to obtain AuNPs solution;

[0043] (4) Au / SiO2 2 Preparation: SiO obtained after modification 2 The microspheres were mixed with a certain amount of Au NPs solution and stirred for 2 h, and SiO with different pa...

Embodiment 3

[0046] (1) SiO 2 Preparation: Add 2 ml tetraethyl silicate (TEOS) to 40 ml isopropanol, then add 1.4 ml ammonia water (NH 3 ·H 2 O), after reacting at room temperature for 4 h, the product was centrifuged, washed with ethanol and water, and dried at 60 °C to obtain spherical SiO 2 ;

[0047] (2) SiO 2 Modification: 200 mg of the obtained SiO 2 Disperse in 200 ml of ethanol, add 2 ml of 3-aminopropyltriethoxysilane (APTES), react at 60 °C for 4 h, centrifuge and wash to obtain SiO with a particle size of 450 nm and a positively charged surface 2 Microspheres;

[0048] (3) Preparation of Ag NPs: Add 50ml 0.4 mM silver nitrate (AgNO 3 ) solution, mix and add 5ml of 12 mM sodium borohydride (NaBH 4 ), reacted for 2 h at room temperature to obtain Ag NPs solution;

[0049] (4) Ag / SiO2 2 Preparation: SiO obtained after modification 2 The microspheres were mixed with a certain amount of Ag NPs solution and stirred for 2 h, and the Ag-SiO with a loading capacity of 1% was ob...

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Abstract

The invention discloses a metal nanoparticle / silicon dioxide composite light catalyst responded by visible light-near-infrared light and a preparation method thereof. 3-aminopropyl triethoxysilane isadopted for modifying spherical SiO2, then the spherical SiO2 is compounded with metal nanoparticles to prepare the metal nanoparticle / silicon dioxide composite light catalyst, and the particle size of SiO2 is 300-600 nm. Under the premise of not changing the size of the metal nanoparticles, the light absorbing character of the metal nanoparticles is regulated by adjusting the size of a carrier toabsorb wide-spectrum solar energy, the optical energy is converted into chemical energy, therefore the obtained composite catalyst can be applied to reduction of photocatalysis aromatic nitro compounds or oxidation of aromatic alcohol compounds under visible light-near-infrared light, and the high catalytic efficiency is achieved.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, and in particular relates to a visible light-near infrared light-responsive metal nanoparticle / silicon dioxide composite catalyst and a preparation method and application thereof. Background technique [0002] Semiconductor photocatalysis technology can directly convert solar energy into chemical energy, which provides a green and environmentally friendly way to solve energy and environmental crises. The core issue of this technology is to design efficient catalysts to maximize the absorption of sunlight to generate a large number of photogenerated carriers to drive redox reactions. However, most conventional semiconductor (TiO2, ZnO, CdS) catalysts suffer from the following disadvantages: high electron-hole pair recombination rate, low quantum efficiency, and low solar energy utilization. The aforementioned drawbacks severely hamper the photocatalytic performance and potential applicati...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J23/50B01J23/42B01J35/08C07C209/36C07C211/51C07C213/02C07C215/76C07C211/45C07C211/47C07C217/84C07C45/29C07C47/228C07C221/00C07C223/02C07C47/277C07C47/24
CPCC07C45/29C07C209/36C07C213/02C07C221/00B01J23/42B01J23/50B01J23/52B01J35/51B01J35/39C07C211/51C07C215/76C07C211/45C07C211/47C07C217/84C07C47/228C07C223/02C07C47/277C07C47/24
Inventor 徐艺军韩创
Owner FUZHOU UNIV
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