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3D flower-like Bi2WO6@CoO heterojunction photocatalyst as well as preparation method and application thereof

A photocatalyst and heterojunction technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the limitation of photocatalytic technology and the difficulty of using visible light and other issues to achieve the effects of improving photocatalytic efficiency, inhibiting recombination, and improving utilization

Active Publication Date: 2020-07-31
沈阳宏坤电气设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of photocatalytic technology is limited due to the fact that wide bandgap semiconductor materials are difficult to use the visible light part of sunlight, and the photogenerated carriers of a single semiconductor material are easily recombined.

Method used

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  • 3D flower-like Bi2WO6@CoO heterojunction photocatalyst as well as preparation method and application thereof
  • 3D flower-like Bi2WO6@CoO heterojunction photocatalyst as well as preparation method and application thereof
  • 3D flower-like Bi2WO6@CoO heterojunction photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Bi 2 WO 6 The preparation of @CoO heterojunction (1% BWC) includes the following steps:

[0026] 1. Bi 2 WO 6 preparation of

[0027] 4mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 20 mL of acetic acid aqueous solution (by volume, acetic acid: water = 3:5), and stirred at 25°C for 30 min to obtain solution A.

[0028] 2mmol Na 2 WO 4 2H 2 O was dissolved in 10 mL of water to obtain solution B.

[0029] Add solution A dropwise into solution B, mix evenly, transfer the mixed solution to a reaction kettle, and conduct a hydrothermal reaction at 180°C for 16 hours, wash and dry the obtained product to obtain Bi 2 WO 6 .

[0030] 2. Bi 2 WO 6 Preparation of @CoO heterojunction (1%BWC)

[0031] 0.5g of Bi 2 WO 6 Added to 40mL containing 0.02g Co(CH 3 COO) 2 4H 2 O in methanol solution, stirred at 25°C for 120min, the resulting mixture evaporated methanol at 80°C, dried the resulting product, and then dried under N 2 Calcined at 400 °C for 1 h under atmospher...

Embodiment 2

[0033] (1) Bi 2 WO 6 The preparation of @CoO heterojunction (3%BWC) includes the following steps:

[0034] 1. Bi 2 WO 6 Preparation of nanosheets: same as Example 1.

[0035] 2. Bi 2 WO 6 Preparation of @CoO heterojunction (3%BWC)

[0036] 0.5g of Bi 2 WO 6 Added to 40mL containing 0.05g Co(CH 3 COO) 2 4H 2 O in methanol solution, stirred at 25°C for 120min, the resulting mixture evaporated methanol at 80°C, dried the resulting product, and then dried under N 2Calcined at 400 °C for 1 h under atmosphere to obtain 3D flower-like Bi with a CoO loading of 3% by weight 2 WO 6 @CoO heterojunction photocatalyst, recorded as 3% BWC.

[0037] 3. Comparative example - preparation of CoO

[0038] Co(CH 3 COO) 2 4H 2 O in N 2 Under atmosphere, directly calcined at 400°C for 1 h to obtain CoO.

[0039] (2) Detection

[0040] 1, figure 1 is bi 2 WO 6 , CoO and 3% BWC XRD patterns. Depend on figure 1 It can be seen that the obtained pure Bi 2 WO 6 Bi at 28.31°, 3...

Embodiment 3

[0043] (1) Bi 2 WO 6 The preparation of @CoO heterojunction (5% BWC) includes the following steps:

[0044] 1. Bi 2 WO 6 Preparation of nanosheets: same as Example 1.

[0045] 2. Bi 2 WO 6 Preparation of @CoO heterojunction (5% BWC)

[0046] 0.5g of Bi 2 WO 6 Added to 40mL containing 0.07g Co(CH 3 COO) 2 4H 2 O in methanol solution, stirred at 25°C for 120min, the resulting mixture evaporated methanol at 80°C, dried the resulting product, and then dried under N 2 Calcined at 400 °C for 1 h under atmosphere to obtain 3D flower-like Bi with a CoO loading of 5% by weight 2 WO 6 @CoO heterojunction photocatalyst, denoted as 5% BWC.

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Abstract

The invention discloses a 3D flower-like Bi2WO6@CoO heterojunction photocatalyst as well as a preparation method and application thereof. The 3D flower-like Bi2WO6@CoO heterojunction photocatalyst isprepared by loading semiconductor CoO nanoparticles onto Bi2WO6, and the weight percentage of the CoO nanoparticles is 1-7%. According to the invention, a novel Bi2WO6@CoO (BWC) heterojunction photocatalysis with 3D flower-like grading is constructed; the composite material has a large specific surface area, ultrahigh visible light absorption capacity and enhanced electron-hole pair separation efficiency, and compared with single Bi2WO6 and CoO, the heterojunction material shows enhanced catalytic activity.

Description

technical field [0001] The invention belongs to the field of photocatalysts, in particular to a Bi with 3D flower-like structure 2 WO 6 @CoO heterojunction photocatalyst and its preparation method and its application in photocatalytic oxidation of tetracycline and reduction of Cr(VI). Background technique [0002] In recent years, antibiotics have been widely used in the fields of medical treatment and animal husbandry. Because people or animals often cannot fully metabolize and absorb them, a large number of antibiotics enter the environmental water body in their original state, causing water pollution. It will not only affect aquatic organisms It causes harm, and also threatens the survival and health of human beings due to the food chain. [0003] Tetracycline antibiotics are a class of broad-spectrum antibiotics and are the most widely used. However, the abuse of antibiotics has also caused the resistance of organisms, and the water containing antibiotics has certain ...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J35/02C02F1/30C02F101/22C02F101/38
CPCB01J23/888C02F1/30C02F2101/38C02F2305/10C02F2101/22B01J35/00B01J35/30B01J35/39
Inventor 刘雪岩张蕾刘安琪刘婷婷
Owner 沈阳宏坤电气设备有限公司
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