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Method for preparing mesoporous AgGaO2 photocatalytic material

A photocatalytic material and mesoporous technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Photocatalytic materials, limiting solar energy utilization and other issues, to achieve the effect of improving photocatalytic activity, good reproducibility, and easy operation

Inactive Publication Date: 2013-12-18
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complexity of the photocatalytic process, there are still many theoretical and practical issues that have not been resolved. 2 Photocatalytic technology, which is a typical photocatalytic material, still basically stays at the level of laboratory research
It also has some defects in practical application: (1) TiO 2 Light absorption is only limited to the ultraviolet region with a shorter wavelength, and the absorption of sunlight is less than 5% of the solar spectrum irradiated on the ground, which limits the utilization of solar energy; (2) photogenerated carriers (h + , e - ) are easily recombined
[0005] For copper-based CuBO 2 The delafossite type can generally be prepared by high-temperature solid-state reaction, but due to the relatively low free energy of noble metal oxides, especially Ag 2 The decomposition temperature of O in air is 300 ° C, and its lower decomposition temperature causes its oxide to decompose before the reaction in the solid-state reaction. Therefore, the preparation of silver-containing AgGaO 2 Delafossite-type oxides cannot be prepared by the above methods, and there is no information on how to prepare mesoporous AgGaO in the prior art 2 Related reports on photocatalytic materials

Method used

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  • Method for preparing mesoporous AgGaO2 photocatalytic material
  • Method for preparing mesoporous AgGaO2 photocatalytic material
  • Method for preparing mesoporous AgGaO2 photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] in CH 3 COONa·3H 2 O and Ga(NO 3 ) 3 ·8H 2 O as raw material, weigh 0.03mol CH 3 COONa·3H 2 O and 0.015mol Ga(NO 3 ) 3 ·8H 2O, dissolved in 60ml of ethylene glycol, added 1g of surfactant P123, stirred with a glass rod for 10min to fully dissolve, stirred in a water bath at 70°C for 5h, dried the obtained gel at 190°C for 12h, and finally at 850°C Calcined for 5h to obtain white mesoporous NaGaO 2 powder. The resulting mesoporous NaGaO 2 , AgNO 3 、KNO 3 According to the molar ratio of 1:1.5:1, mix and grind in an agate mortar for 10 minutes, transfer the mixture to a corundum crucible, and calcinate at 210°C for 20 hours. The obtained product is washed with deionized water, centrifuged, and placed in an oven. Dry at 80°C and grind to obtain mesoporous AgGaO 2 photocatalytic material. figure 2 For the prepared AgGaO 2 XRD pattern, all the diffraction characteristic peaks in the figure are consistent with AgGaO 2 (JCPDS, No.21-1076) is consistent with th...

Embodiment 2

[0028] in CH 3 COONa·3H 2 O and Ga(NO 3 ) 3 ·8H 2 O as raw material, weigh 0.03mol CH 3 COONa·3H 2 O and 0.015mol Ga(NO 3 ) 3 ·8H 2 O, dissolve in 60ml of ethylene glycol, add 1g of surfactant CTAB, stir with a glass rod for 10min to fully dissolve, stir in a water bath at 70°C for 5h, dry the obtained gel at 190°C for 12h, and finally at 850°C Calcined for 5h to obtain white mesoporous NaGaO 2 powder. The resulting mesoporous NaGaO 2 , AgNO 3 、KNO 3 Mix and grind in an agate mortar for 10 minutes according to a molar ratio of 1:1:1, transfer the mixture to a corundum crucible, and calcinate at 210°C for 20 hours. The obtained product is washed with deionized water, centrifuged, and placed in an oven Dry at 80°C and grind to obtain mesoporous AgGaO 2 photocatalytic material. Figure 4 Embodiment 1 of the present invention, product obtained in 2 and P25 (commercial TiO 2 , generally used to compare the photocatalytic effect of synthetic photocatalytic materials)...

Embodiment 3

[0030] in CH 3 COONa·3H 2 O and Ga(NO 3 ) 3 ·8H 2 O as raw material, weigh 0.03mol CH 3 COONa·3H 2 O and 0.015mol Ga(NO 3 ) 3 ·8H 2 O, dissolved in 60ml of ethylene glycol, added 1g of surfactant F127, stirred with a glass rod for 10min to fully dissolve, stirred in a water bath at 70°C for 5h, and a gel was obtained. The resulting gel was dried at 190 °C for 12 h, and finally calcined at 850 °C for 5 h to obtain white mesoporous NaGaO 2 powder. The resulting mesoporous NaGaO 2 , AgNO 3 、KNO 3 According to the molar ratio of 1:1:2, mix and grind in an agate mortar for 10 minutes, transfer the mixture to a corundum crucible, and calcinate at 210°C for 20h. The obtained product is washed with deionized water, centrifuged, and placed in an oven at 80°C Dry and grind to obtain mesoporous AgGaO 2 photocatalytic material.

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Abstract

The invention relates to a method for preparing a mesoporous AgGaO2 photocatalytic material. The mesoporous AgGaO2 photocatalytic material is prepared through two steps. Firstly, mesoporous AgGaO2 is prepared by the utilization of the sol-gel method, and then, the prepared AgGaO2 is used as a raw material to be synthesized to form AgGaO2 through the ion exchange method. The method has the advantages of being unique in technology and convenient to operate. The prepared mesoporous AgGaO2 is large in specific surface area, adjustable and controllable in pore structure and high in photocatalysis activity, and has broad application prospects in the fields such as indoor air purification. The method for preparing the mesoporous AgGaO2 photocatalytic material can provide a new idea for optimization design and large-scale preparation of other novel polybasic metallic oxide photocatalytic materials containing silver.

Description

technical field [0001] The invention relates to the field of preparation of photocatalytic materials, in particular to a mesoporous AgGaO 2 Preparation methods of photocatalytic materials. Background technique [0002] In recent years, energy crisis and environmental pollution have become two major problems plaguing human society. Therefore, people urgently need to seek and develop new alternative energy sources, as well as high-efficiency, low-cost, green and environmentally friendly environmental pollutant treatment technologies. At present, among many treatment technologies, photocatalytic technology using semiconductors as catalysts can convert low-density sunlight energy into high-density chemical energy and electrical energy, and can directly use low-density sunlight to degrade and mineralize water and Various pollutants in the air. Therefore, photocatalytic engineering technology has great potential in environmental pollution control and new energy development, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66C01G15/00
Inventor 张向超贾艳荣张世英许第发余取民
Owner CHANGSHA UNIVERSITY
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