Method for preparing supported nano TiO2 composite photocatalysis material by microwave

A technology of composite photocatalysis and photocatalytic materials, which is applied in the field of preparing non-metallic mineral-supported nano-TiO2 composite photocatalytic materials by microwave method, can solve the problems of poor wastewater capacity effect, poor capacity effect, poor loading effect, etc., and achieves low cost, The effect of improving practical ability and improving activity

Inactive Publication Date: 2009-07-22
XIHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent application number is CN99102734.5 "Preparation method of supported titanium dioxide photocatalyst". The natural mineral attapulgite is used as the carrier, and titanium dioxide is loaded on the mineral by impregnation method. The prepared catalyst has the same ratio as the titanium dioxide powder. Surface area and porous structure, the problem of this method is that the non-metallic minerals are not pretreated to make the loading effect poor. In order to improve the loading effect, only the normal temperature method is used alone to load titanium dioxide on the natural mineral attapulgite rod
The Chinese patent application number is CN00129873.9 "Method for preparing nano-titanium dioxide by microwave heating". The method of microwave heating is used to hydrolyze the titanium-containing solution of titanium oxysulfate and titanium tetrachloride to prepare nano-titanium dioxide, which has achieved good results. The particle size distribution of the powder is uniform and the particle shape is regular. This method only uses microwave heating to carry out the hydrolysis process, and does not study the use of carriers and the addition of rare earth elements.
"Rare earth doped modified TiO" on "Environmental Science and Technology" 2 Microcrystalline structure and photocatalytic performance" (2005, Vol.28, No.1), adding rare earth elements such as La, Ce, Y and Sm can make TiO 2 The unit cell parameters are reduced to increase the photocatalytic degradation rate, but the actual ability to treat wastewater is poor
In the "Journal of East China University of Science and Technology" on "Effect of Rare Earth Element Doping on Photocatalytic Performance" (2000, Vol.26, No.3), uniform TiO was prepared on glazed tiles by sol-gel method 2 Thin films, doped with rare earth elements La, Ce, Y, etc. can improve photocatalytic performance, but the actual ability to treat wastewater is poor

Method used

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  • Method for preparing supported nano TiO2 composite photocatalysis material by microwave
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  • Method for preparing supported nano TiO2 composite photocatalysis material by microwave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Zeolite is carrier, tetrabutyl titanate is precursor

[0046] Add 10ml tetrabutyl titanate to 50ml ethanol and stir to form a transparent light yellow solution A, add 10ml glacial acetic acid to solution A and stir at 50°C for 1 hour to form transparent TiO 2 Sol, adjust the pH value of this sol to 1.5, and stir to generate a transparent solution B. Add 0.8 g of zeolite-based minerals to solution B, stir for 10 minutes, heat for 5 minutes at a microwave power of 250W, wash with water and use centrifugal dehydration until the supernatant is close to neutral, filter and dehydrate the cake at 80°C Drying and calcining at 200° C. for 2.5 hours to obtain 2 grams of nano-titanium dioxide photocatalytic material product.

[0047] For the photocatalytic degradation effect of simulated printing and dyeing wastewater Rhodamine B, the photocatalytic degradation conditions are: the natural pH value of Rhodamine B solution is the initial pH value of the solution, the ...

Embodiment 2

[0048] Example 2: According to the preparation method of Example 1, the microwave heating time is 10 minutes, the calcination temperature is 300°C, the calcination time is 2.5 hours, and the microwave power is 250W. The photocatalytic degradation conditions are: the natural pH value of Rhodamine B solution is the initial pH value of the solution, the concentration of Rhodamine B is 0.15mmol / L, the amount of photocatalyst is 5g / L, the light reaction time is determined at 1.5 hours, and the ultraviolet The light intensity adopts an 8W ultraviolet lamp tube, and the degradation rate is 91.56%.

Embodiment 3

[0049] Embodiment 3: according to the preparation method of example 1, the photocatalytic degradation condition is: the pH value of Rhodamine B solution is 7.81, the concentration of Rhodamine B solution is 0.05mmol / L, the consumption of photocatalyst is 15g / L, light reaction The time is determined to be 1.5 hours, and the ultraviolet light intensity adopts a 24W ultraviolet lamp tube, and the degradation rate is 94.37%.

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Abstract

The invention relates to a method for preparing a load type nanometer TiO2 composite photocatalysis material by microwave, and belongs to the technical field of nanometer functional materials. The solved technical problem is to seek a method for preparing the load type nanometer TiO2 composite photocatalysis material with easy preparation, low cost and high efficiency. In the method, pretreated nonmetallic minerals are used as a carrier, added in an organic solution dissolved with tetrabutyl titanate or titanyl sulfate or industrial metatitanic acid and subjected to microwave treatment and calcination to prepare the nanometer TiO2 composite photocatalysis material. The method has the advantages of simple process and low cost, and the nanometer TiO2 composite photocatalysis material prepared by the method has high photocatalysis efficiency; moreover, the method can also improve the practical capability of the photocatalyst in treating waste water and lay a solid foundation for gradual industrialized production of the photocatalysis materials.

Description

technical field [0001] The invention belongs to the technical field of nano functional materials, and in particular relates to the preparation of non-metallic mineral-loaded nano TiO by a microwave method 2 Methods for composite photocatalytic materials. Background technique [0002] The photocatalytic oxidation method has a good treatment effect when applied to the treatment of organic pollutants, among which nano-TiO 2 Due to its good chemical stability, high photocatalytic efficiency, low cost, and non-toxicity, it has attracted much attention. Powdered TiO 2 The application of catalysts in actual pollutant treatment has achieved certain results, but when the nano-powder suspension system is used for photocatalysis, due to its fine particles, it is not easy to precipitate, the catalyst is difficult to recover, and the loss of active components is large, which is not conducive to the regeneration and reuse of the catalyst. . To realize the application of this technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06A62D3/17A62D101/20
Inventor 谷晋川
Owner XIHUA UNIV
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