Preparation method and application of tungstate photocatalytic material

A photocatalytic material, tungstate technology, applied in the field of preparation of tungstate photocatalytic materials, can solve the problem of low efficiency

Inactive Publication Date: 2014-01-29
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the problem of low efficiency in traditional tungsten-based oxide photocatalytic materials and improve the efficiency of degrading organic pollutants

Method used

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  • Preparation method and application of tungstate photocatalytic material
  • Preparation method and application of tungstate photocatalytic material
  • Preparation method and application of tungstate photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] (1) will Bi 2 o 3 , Na 2 CO 3 and WO 3 Mix according to stoichiometric ratio.

[0013] (2) After grinding the mixture with ethanol, it was preheated at 650°C for 12h.

[0014] (3) After regrinding, calcining at 800°C for 10h.

[0015] The invention provides a preparation method of a tungstate photocatalytic material and its photocatalytic degradation performance of organic matter. The degradation rate of isopropanol was used to evaluate the degradation performance of photocatalytic organic matter. The degradation process of the photocatalytic reaction of isopropanol is: first, isopropanol is converted into an intermediate product (acetone); then, acetone is oxidized to CO 2 and H 2 O. Because, in the initial stage, isopropanol mainly undergoes the reaction of being degraded into acetone. Therefore, the generation rate of acetone in the initial stage is often used to evaluate the photocatalytic performance. This scheme is further described by the following exa...

specific Embodiment approach 2

[0016] (1) 0.400g of NaBi (WO 4 ) 2 The powder sample is evenly dispersed on the bottom of a glass container, and the glass container is placed on the bottom of a high borosilicate glass container (this is a closed container).

[0017] (2) After sealing the reactor, inject a certain amount of isopropanol into the reactor using a gas sampler. The reactor was placed in a dark place for 2 h to allow the system to reach adsorption-desorption equilibrium.

[0018] (3) The light source is a xenon lamp, which is irradiated on the surface of the material through the cooling circulating water system (to eliminate the thermal effect caused by infrared rays).

[0019] (4) Place the reactor under the light source to start the reaction, and regularly take samples from the reaction system, and use a gas chromatograph to detect the concentrations of isopropanol, acetone and carbon dioxide.

[0020] After reaching the equilibrium of adsorption and desorption, the reaction begins, the initi...

specific Embodiment approach 3

[0021] Specific embodiment three: different from specific embodiment two, the photocatalytic material powder used in step (1) is WO 3 , after the reaction was carried out for 3h, the production rate of acetone was 120ppm / h.

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Abstract

The invention provides a preparation method of a tungstate photocatalytic material and the research on the isopropanol photocatalytic degradation property of the tungstate photocatalytic material. The preparation method of the NaBi(WO4)2 photocatalytic material comprises the following steps: synthesizing NaBi(WO4)2 powder by adopting a high-temperature solid phase reaction method, wherein chemical raw materials are analytically pure and are not further purified; mixing Bi2O3, Na2CO3 and WO3 powder in a stoichiometric ratio, adding alcohol, then grinding for half an hour, carrying out preheating treatment at the temperature of 650 DEG C for 12h, grinding again and calcining for 10 hours at the temperature of 800 DEG C. The research on the isopropanol degradation property of the NaBi(WO4)2 proves that the production rate of acetone exceeds the production rate of the acetone when a catalyst is WO3, and the NaBi(WO4)2 shows an excellent isopropanol degradation property.

Description

technical field [0001] The invention relates to the field of semiconductor material preparation and application, in particular to the preparation of a tungstate photocatalytic material. Background technique [0002] Semiconductor photocatalytic materials have received increasing attention and attention in the field of environmental purification in recent years due to their strong oxidizing ability to degrade organic pollutants. Oxide photocatalytic materials often have the advantages of high efficiency, clean and non-toxic, stable structure, no secondary pollution and simple preparation process. Among them, WO 3 Visible light can be used to achieve a better degradation effect, so more and more researchers pay attention to it. The activity of photocatalytic materials depends largely on their electronic structure, which is closely related to their crystal structure and elemental composition. WO 3 It has good performance of decomposing organic pollutants. Therefore, some t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01D53/86B01D53/72
Inventor 史海峰王颖超
Owner JIANGNAN UNIV
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