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Preparation method of AgAlO2/TiO2 photocatalytic material

A photocatalytic material and gel method technology, which is applied in the field of preparation of AgAlO2/TiO2 heterogeneous photocatalytic materials, can solve the problems of poor ability to degrade organic pollutants, insufficient sunlight absorption, and reduced photoelectric conversion efficiency, etc. Achieving the effect of uniform particle size, good reproducibility and good visible light catalytic activity

Inactive Publication Date: 2014-01-01
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to TiO 2 Bandgap width E g Larger (3.2eV for titanium ore and 3.0eV for rutile), it also has some defects in practical applications: (1) TiO 2 Light absorption is limited to the ultraviolet region with shorter wavelength, and the absorption of sunlight is less than 5% of the solar spectrum irradiated on the ground, which greatly restricts the utilization of solar energy; (2) photogenerated carriers (h+, e-) It is easy to recombine, which reduces the photoelectric conversion efficiency, thereby affecting the efficiency of photocatalysis
[0003] AgAlO 2 As a new type of semiconductor photocatalytic material, its band gap is about 2.95eV, and it can show good photocatalytic performance in the visible light region, but its reduction potential is low, and photogenerated electrons and hole pairs are easy to recombine, making it degrade organic materials. Pollutants are less capable

Method used

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  • Preparation method of AgAlO2/TiO2 photocatalytic material
  • Preparation method of AgAlO2/TiO2 photocatalytic material
  • Preparation method of AgAlO2/TiO2 photocatalytic material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Preparation of TiO by sol-gel method 2

[0029] Butyl titanate is used as the source material, and absolute ethanol is used as the solvent. Mix 34g of tetrabutyl titanate and 36.8g of absolute ethanol evenly, mechanically stir for 1h in a water bath at 40°C, and use concentrated HNO 3 Adjust the pH between 1.5-2, then add 3.6g of deionized water into the mixed solution at a rate of 3 drops / second with a glue-tip dropper, continue mechanical stirring for 1.5h in a water bath at room temperature, and place the prepared sol A light yellow gel was obtained for a period of time, dried in a constant temperature drying oven at 70°C for 5h, ground, and calcined at 450°C for 3h to obtain the product n-type TiO 2 ;

[0030] (2) Preparation of NaAlO by sol-gel method 2

[0031] CH 3 COONa·3H 2 O and Al(NO 3 ) 3 9H 2 O is mixed evenly according to the molar ratio of 1:1 (molar mass is 0.01mol), then mixed with 60ml of ethylene glycol solvent, added 1g of surfactant po...

Embodiment 2

[0036] (1) Preparation of TiO by sol-gel method 2

[0037] Butyl titanate is used as the source material, and absolute ethanol is used as the solvent. Mix 34g of tetrabutyl titanate and 36.8g of absolute ethanol evenly, mechanically stir for 1h in a water bath at 40°C, and use concentrated HNO 3 Adjust the pH between 1.5-2, then slowly add 3.6g of deionized water into the mixed solution with a rubber dropper, continue to mechanically stir for 1.5h in a water bath at room temperature, and let the prepared sol stand for a period of time to obtain a light yellow color Gel, dried in a constant temperature drying oven at 70°C for 5h, ground, and calcined at 450°C for 3h to obtain the product TiO 2 .

[0038] (2) Preparation of NaAlO by sol-gel method 2

[0039] CH 3 COONa·3H 2 O and Al(NO 3 ) 3 9H 2 O is mixed evenly according to the molar ratio of 1:1 (molar mass is 0.01mol), then mixes with 60ml ethylene glycol solvent, adds 1gCTAB, stirs with a glass rod for 15min to m...

Embodiment 3

[0044] (1) Preparation of TiO by sol-gel method 2

[0045] Butyl titanate is used as the source material, and absolute ethanol is used as the solvent. Mix 34g of tetrabutyl titanate and 36.8g of absolute ethanol evenly, mechanically stir for 1h in a water bath at 40°C, and use concentrated HNO 3 Adjust the pH between 1.5-2, then slowly add 3.6g of deionized water into the mixed solution with a rubber dropper, continue to mechanically stir for 1.5h in a water bath at room temperature, and let the prepared sol stand for a period of time to obtain a light yellow color Gel, dried in a constant temperature drying oven at 70°C for 5h, ground, and calcined at 450°C for 3h to obtain the product TiO 2 .

[0046] (2) Preparation of NaAlO by sol-gel method 2

[0047] CH 3 COONa·3H 2 O and Al(NO 3 ) 3 9H 2 After O is mixed evenly according to the molar ratio of 1:1 (molar mass is 0.01mol), then mix with 60ml ethylene glycol solvent, add 1gP123, stir it with a glass rod for 15min...

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Abstract

The invention relates to a preparation method of an AgAlO2 / TiO2 photocatalytic material. The preparation method comprises the following steps: 1, preparing TiO2 through a sol-gel method; 2, preparing NaAlO2 through the sol-gel method; 3, preparing AgAlO2 / TiO2 through an ion-exchange method. According to the invention, P-type delafossite type AgAlO2 and n-type TiO2 are compounded to form an alloplastic photocatalytic material, so that under the condition of improving the yield of photoinduced electron-hole pairs of the material, the electron-hole pairs can be effectively prevented from compounding again, the quantum yield is improved, and then visible light catalytic activity better than that of single AgAlO2 can be represented. The preparation method provided by the invention is mild in reaction conditions, easy to operate, and good in repeatability; and a prepared product is high in crystallinity and uniform in particle size, and the particle diameter is about 100 to 200 nm.

Description

technical field [0001] The present invention relates to a kind of AgAlO 2 / TiO 2 The invention discloses a method for preparing a heterogeneous photocatalytic material, which belongs to the field of preparation and application of inorganic functional materials. Background technique [0002] In recent years, photocatalytic technology using semiconductors as catalysts has become an ideal environmental pollution control technology due to its unique advantage of directly using sunlight as a light source to promote oxidation-reduction reactions at room temperature. There are many kinds of photocatalysts currently used to degrade environmental pollutants, such as CuO, ZnO, TiO 2 、WO 3 etc., where TiO 2 As a traditional inorganic functional material, it has the advantages of high photocatalytic activity, fast degradation rate, good chemical stability, and no secondary pollution. But due to TiO 2 Bandgap width E g Larger (3.2eV for titanium ore and 3.0eV for rutile), it also ...

Claims

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Application Information

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IPC IPC(8): B01J23/50
Inventor 张向超贾艳荣张世英许第发余取民
Owner CHANGSHA UNIVERSITY
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