Cerium ion doped tungsten trioxide catalyst and preparation method and application thereof

A technology of tungsten trioxide and cerium ions, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. The effect of secondary pollution, improving surface activity and convenient operation

Active Publication Date: 2013-03-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For existing WO 3 For the problem of weak photocatalytic activity of the catalyst, the present invention provides a cerium ion-doped tungsten trioxide catalyst and its preparation method and application. The produced catalyst has high stability and good activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of cerium ion doped tungsten trioxide catalyst, comprising the following steps:

[0036] A) To the H with magnetic stirring at a speed of 300r / min 2 o 2 Add tungsten powder, tungsten powder and H 2 o 2 The molar ratio is 1:4. After continuous heating and stirring for 2 hours, the milky white solution turns into a yellow sol-like substance, which is naturally cooled to room temperature.

[0037] B) To CH with magnetic stirring at a speed of 180r / min 3 CH 2 Add cerium nitrate in OH, heat and stir, wherein the mol ratio of the Ce element in the cerium nitrate and the W element in the tungsten powder in step A) is 1:90, CH 3 CH 2 OH and H in step A) 2 o 2 The volume ratio is 1:1, H2 o 2 The mass fraction is 30%.

[0038] C) Inject the solution obtained in step B) into the yellow sol-like substance obtained in step A), heat and stir to obtain a gel, and then age the gel for 2 hours.

[0039] D) Put the gel obtained in step C) into an oven, dry...

Embodiment 2

[0044] With embodiment 1, difference is, the speed of magnetic stirring in step A) is 200r / min, and the continuous heating and stirring time is 110min; The speed of magnetic stirring in step B) is 150r / min, and the Ce element in cerium nitrate and The molar ratio of W element in the tungsten powder in step A) is 1:105; the gel aging time in step C) is 1.5h.

[0045] The application method of the prepared cerium ion-doped tungsten trioxide catalyst in the photocatalytic oxidation of fungicide wastewater, adding cerium ion-doped tungsten trioxide catalyst and hydrogen peroxide to the fungicide wastewater, and the addition of cerium ion-doped tungsten trioxide catalyst The dosage is 170mg / L, the dosage of hydrogen peroxide is 2ml / L, and the light is a 500W ultraviolet lamp.

[0046] Under the same conditions, the removal rate of hymexazol in the bactericide wastewater of the present invention is better than that of WO alone. 3 The catalytic oxidation method has increased by more...

Embodiment 3

[0048] With embodiment 1, the difference is that the speed of magnetic stirring in step A) is 260r / min; the speed of magnetic stirring in step B) is 200r / min, the Ce element in cerium nitrate and step A) in the The molar ratio of W element is 1:75; the gel aging time in step C) is 0.5h; the heating in step E) is at a rate of 2°C / min to 405°C, and the calcination time is 2.5h.

[0049] The application method of the prepared cerium ion-doped tungsten trioxide catalyst in the photocatalytic oxidation of fungicide wastewater, adding cerium ion-doped tungsten trioxide catalyst and hydrogen peroxide to the fungicide wastewater, and the addition of cerium ion-doped tungsten trioxide catalyst The dosage is 100mg / L, the dosage of hydrogen peroxide is 1ml / L, and the light is a 200W ultraviolet lamp.

[0050] Under the same conditions, the present invention has a higher removal rate than WO alone in the fungicide wastewater. 3 The catalytic oxidation method has increased by more than 63...

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Abstract

The invention discloses a cerium ion doped tungsten trioxide catalyst and a preparation method and application thereof and belongs to the technical field of catalysts. The preparation method of the cerium ion doped tungsten trioxide catalyst comprises the steps of (A), adding tungsten powder into H2O2 which is subjected to magnetic stirring at the speed of 200-300r/min; (B), adding cerous nitrate into CH3CH2OH which is subjected to magnetic stirring at the speed of 150-200r/min; (3) adding yellow sol-like matters obtained in the step (A) into the solution obtained in the step (B), heating the mixture with stirring, and aging the mixture; (D) placing the gel obtained in the step (C) into a drying oven to perform drying at the temperature of 100-105 DEG C, and grinding the dried gel into powder; and (E), placing the powder obtained in the step (D) into a muffle furnace, heating the powder, and calcining the powder to obtain the cerium ion doped tungsten trioxide catalyst. The cerium ion doped tungsten trioxide catalyst produced by the preparation method is good in stability, high in activity, simple in preparation, low in cost, convenient to operate and not liable to cause secondary pollution.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a catalyst for photocatalytic oxidation of fungicides, and more specifically relates to a cerium ion-doped tungsten trioxide catalyst and its preparation method and application. Background technique [0002] Bactericide wastewater is typical refractory toxic and harmful industrial wastewater, such as wastewater discharged from the pesticide industry and wastewater discharged from some chemical industries. Due to the high concentration of fungicides in wastewater, it can kill and inhibit the growth of microorganisms. On the other hand, most organic fungicides are polycyclic or heterocyclic organic compounds with poor biodegradability. Therefore, fungicide wastewater is difficult to be treated directly by biotechnology. The safe treatment of this kind of wastewater is the main factor restricting the development of pesticide and chemical industry. In comparison, ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C02F1/32C02F1/72
Inventor 任洪强贾国正丁丽丽
Owner NANJING UNIV
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