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Method for synthetizing tungstate/tungsten oxide heterojunction photocatalyst in situ

A photocatalyst, in-situ synthesis technology, applied in the direction of protection device against harmful chemicals, etc., can solve the problems of limited practical application, complicated preparation route, increased catalyst preparation cost, etc., to widen the light response range, and the preparation process is easy to operate. , the effect of improving the photocatalytic efficiency

Inactive Publication Date: 2015-12-02
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the photocatalytic activity of the above-mentioned heterojunction composite materials is improved, the preparation process adopts the hydrothermal synthesis method, which requires long-term high-temperature and high-pressure treatment during the reaction process, and the preparation route is relatively complicated, which increases the preparation cost of the catalyst and limits its use. practical application

Method used

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  • Method for synthetizing tungstate/tungsten oxide heterojunction photocatalyst in situ
  • Method for synthetizing tungstate/tungsten oxide heterojunction photocatalyst in situ
  • Method for synthetizing tungstate/tungsten oxide heterojunction photocatalyst in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation and Photocatalytic Activity of Copper Tungstate / Tungsten Oxide Heterojunction Photocatalyst

[0036] 1.1 CuWO 4 / WO 3 The preparation method of heterojunction photocatalyst comprises the following steps:

[0037] (1) Weigh 15g of ammonium tungstate and dissolve it in 150mL of deionized water, heat it in a water bath to dissolve it, and add 3mol·L -1 After adding 250mL of nitric acid, heat in a water bath at 80°C for 1 hour, and age for 12 hours. The precipitate was centrifuged, washed, and dried at 80°C to obtain WO 3 ·H 2 O;

[0038] (2) For the WO obtained in step (1) 3 ·H 2 O, calcined at 500°C for 6h to obtain WO 3 carrier;

[0039] (3) Prepare a series of concentrations of Cu(NO 3 ) 2 solution, respectively, 1.0gWO 3 The support was impregnated with equal volume in Cu(NO 3 ) 2 In the solution (the mass ratio of metal element Cu to W is 0.2%, 0.5%, 1%, 3%, 5%, 7%, 10%), stand still for 24h, stir and dry in a water bath at 90°C. During this...

Embodiment 2

[0051] Preparation and photocatalytic activity of zinc tungstate / tungsten oxide heterojunction photocatalyst

[0052] 2.1 ZnWO 4 / WO 3 The preparation method of heterojunction photocatalyst comprises the following steps:

[0053] wxya 4 / WO 3 The preparation method of the heterojunction photocatalyst is with reference to embodiment 1 (1.1), and the difference is that in step (2), the WO 3 ·H 2 The calcination temperature of O was changed to 600°C, the calcination time was extended to 30h, and in step (3), the Cu(NO 3 ) 2 The solution was changed to Zn(NO 3 ) 2 solution. exist Figure 5 Monoclinic phase WO was observed in 3 At the same time, ZnWO was observed at 2θ=15.4°, 18.8°, 30.4°, 30.6°, 31.1°, 36.3°, 36.6°, 38.3°, 41.2°, 51.7° 4 Diffraction peak, illustrates that the sample that makes in the embodiment 2 is ZnWO 4 / WO 3 heterojunction photocatalysts.

[0054] 2.2 ZnWO 4 / WO 3 Photocatalytic activity of heterojunction photocatalysts:

[0055] For ZnWO in ...

Embodiment 3

[0057] Preparation and photocatalytic activity of manganese tungstate / tungsten oxide heterojunction photocatalyst

[0058] wxya 4 / WO 3 The preparation method of heterojunction photocatalyst is with reference to embodiment 1 (1.1), difference is that in step (3), Cu(NO 3 ) 2 The solution was changed to Mn(NO 3 ) 2 solution, and in step (4), change the roasting temperature to 600°C and extend the time to 12h. Figure 7 (a) is 10wt% MnWO 4 / WO 3 The XRD spectrum of the sample, in the observed monoclinic phase WO 3At the same time, MnWO was observed at 2θ=15.4°, 18.3°, 29.8°, 30.2°, 31.0°, 35.9°, 37.2°, 40.3°, 40.8°, 51.0° 4 Diffraction peaks, illustrating that the sample obtained in Example 3 is MnWO 4 / WO 3 heterojunction photocatalysts. The photocatalytic degradation experiment followed the method of 1.2 in Example 1. Under the condition of light for 90min, 0.2wt% MnWO 4 / WO 3 The degradation rate of rhodamine B by the heterojunction photocatalyst is 54%, which i...

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Abstract

The invention relates to a method for synthetizing a tungstate / tungsten oxide heterojunction photocatalyst in situ. The method comprises the following steps that WO3 is prepared or externally purchased to serve as a carrier; 2, a metal nitrate solution is prepared; 3, the WO3 is dipped in the metal nitrate solution; 4, bath drying and roasting are performed on a mixture obtained in the step 3, metal nitrate is decomposed to obtain a metal oxide (MO) in the roasting process, the MO reacts with the WO3 to generate MWO4, the MWO4 is loaded on the WO3 carrier in situ, and the MWO4 / WO3 hetorojuncton photocatalyst is formed. According to the method, the MWO4 / WO3 hetorojuncton photocatalyst is synthetized in situ, the used raw materials are low in cost, the preparation process is easy to operate, the high pressure condition and special equipment are not needed, the technology is simple, and the preparation cost is low.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst, in particular to a method for synthesizing a tungstate / tungsten oxide heterojunction photocatalyst in situ. Background technique [0002] The problems of energy and environmental pollution have been widely concerned by people. Photocatalytic technology has the advantages of simple operation, mild reaction conditions, low energy consumption and less secondary pollution, so it has attracted widespread attention in the field of solving energy crisis and environmental pollution. Tungsten trioxide (WO 3 ) is a typical n-type semiconductor material, which has broad application prospects in electrochromic devices, gas sensors, photocatalysts, etc. Especially in the field of photocatalysis, WO 3 With other semiconductors (such as: TiO 2 、 Bi 2 o 3 ) compared with the narrow bandgap (2.4 ~ 2.8eV), you can use solar energy more effectively. However, WO 3 The high photogenerated electron-hol...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J23/30B01J23/34A62D3/17A62D101/26A62D101/28
Inventor 张静卢圆圆宋春冬吴维成李薇
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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