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Nickel ion-doped tungsten trioxide catalyst, and preparation method and application thereof

A technology of tungsten trioxide and nickel ions, which is applied in the direction of oxidized water/sewage treatment, illuminated water/sewage treatment, etc., can solve the problems of weak photocatalytic activity, achieve secondary pollution, improve photocatalytic activity, and simple preparation Effect

Active Publication Date: 2015-04-08
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 nickel ion-doped tungsten trioxide catalyst and its preparation method and application. Greatly improve the removal rate of pollutants in wastewater, and at the same time strengthen the deep degradation of oxidized intermediate products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A nickel ion-doped tungsten trioxide catalyst and a preparation method thereof, comprising the following steps:

[0037] A) To the H with magnetic stirring at a speed of 200r / min 2 o 2 Add tungsten powder, tungsten powder and H 2 o 2The molar ratio of the solution is 1:4. Continue heating and stirring. As the temperature rises, the color of the milky white solution gradually changes. After heating for 2 hours, the milky white solution turns into a yellow sol-like substance, which is naturally cooled to room temperature.

[0038] B) To CH with magnetic stirring at a speed of 150r / min 3 Add nickel acetate in OH, heat and stir, wherein the molar ratio of the Ni element in the nickel acetate to the W element in the tungsten powder in step A) is 1:5, CH 3 OH and H in step A) 2 o 2 The volume ratio of H is 1:1; H 2 o 2 The mass fraction is 30%.

[0039] C) Inject the solution obtained in step B) into the yellow sol-like substance obtained in step A), heat and stir fo...

Embodiment 2

[0045] With embodiment 1, difference is, the speed of magnetic stirring in step A) is 260r / min, and the continuous heating and stirring time is 100min; The speed of magnetic stirring in step B) is 250r / min, the Ni element in the nickel acetate and The molar ratio of W in the tungsten powder in step A) is 1:8; the gel aging time in step C) is 1h; the drying temperature in step D) is 103°C.

[0046] The obtained nickel ion-doped tungsten trioxide catalyst was applied to photocatalytic oxidation of fungicide wastewater. The method of use is to add nickel ion-doped tungsten trioxide catalyst and hydrogen peroxide to the fungicide wastewater, the dosage of nickel ion-doped tungsten trioxide catalyst is 100mg / L, and the dosage of hydrogen peroxide is 2ml / L. The light is a 320W UV lamp.

[0047] Under the same conditions, the removal rate of chlorothalonil in the fungicide wastewater of the present invention is 34.23% higher than that of the single hydrogen peroxide oxidation method...

Embodiment 3

[0049] With Example 1, the difference is that the speed of magnetic stirring in step A) is 300r / min, and the continuous heating and stirring time is 1.5h; the speed of magnetic stirring in step B) is 220r / min, and the Ni element in nickel acetate The molar ratio of W in the tungsten powder in step A) is 1:2; the gel aging time in step C) is 1h; the drying temperature in step D) is 100°C; the heating in step E) is at 1.5°C / The temperature was raised to 380°C at a speed of min, and the calcination time was 3.5h.

[0050] The obtained nickel ion-doped tungsten trioxide catalyst was applied to photocatalytic oxidation of fungicide wastewater. The method of use is to add nickel ion-doped tungsten trioxide catalyst and hydrogen peroxide to the fungicide wastewater. The dosage of nickel ion-doped tungsten trioxide catalyst is 180mg / L, and the dosage of hydrogen peroxide is 1ml / L. The light is a 500W UV lamp.

[0051] Under the same conditions, the removal rate of pentachloronitrob...

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Abstract

The invention discloses a nickel ion-doped tungsten trioxide catalyst, and a preparation method and application thereof, and belongs to the field of preparation of the catalyst. The preparation method of the catalyst comprises the following steps of A) adding tungsten powder to H2O2, wherein the molar ratio of the tungsten powder to the H2O2 is 1 to 4, lastingly heating and stirring the tungsten powder; B) adding nickel acetate to CH3OH to heat and stir; C) injecting solution obtained from the step B) into yellow sol substance obtained from the step A), heating, stirring and aging; D) putting the gel obtained from the step C) into an oven to dry, and then grinding into powder; E) putting the powder obtained from the step D) into a muffle furnace, heating and calcining to obtain the nickel ion-doped tungsten trioxide catalyst. The catalyst produced by the invention is high in stability and good in activity, not only can generate hydroxyl radical by photo-catalytic oxidation; the pollutant removal rate in the wastewater is obviously improved; and meanwhile, deep degradation of an intermediate oxide product also can be strengthened.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a catalyst for photocatalytic oxidation of bactericides, and more specifically relates to a nickel 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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888C02F1/30C02F1/32C02F1/72
Inventor 丁丽丽贾国正任洪强
Owner NANJING UNIV
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