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Preparation method of Bi/BiVO4-CdS photocatalyst rich in oxygen vacancies

A photocatalyst, oxygen vacancy technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., to achieve good economic and environmental benefits, high degradation efficiency, improved light Effects of Corrosion Problems

Active Publication Date: 2020-10-30
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the narrow bandgap energy leads to the rapid recombination of photoinduced carriers, further improvements in pure BiVO are needed. 4 Photocatalytic properties of photocatalysts

Method used

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  • Preparation method of Bi/BiVO4-CdS photocatalyst rich in oxygen vacancies
  • Preparation method of Bi/BiVO4-CdS photocatalyst rich in oxygen vacancies
  • Preparation method of Bi/BiVO4-CdS photocatalyst rich in oxygen vacancies

Examples

Experimental program
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Effect test

Embodiment 1

[0047] BiVO 4 Preparation of:

[0048] Disperse 50-80 mg of bismuth nitrate pentahydrate in 40-45 mL of deionized water, sonicate for 10-20 minutes, and then stir evenly for 20-30 minutes. Subsequently, 90-110 mg of sodium orthovanadate was added to the mixed solution. After stirring for 1-2 hours, the solution was transferred to a hydrothermal reaction kettle and kept at 160° C. for 2, 4, 6, and 8 hours, respectively. The yellow powder was washed more than 3 times with deionized water and absolute ethanol to obtain BiVO 4 -2. BiVO 4 -4. BiVO 4 -6. BiVO 4 -8.

[0049] Bi / BiVO 4 Preparation of:

[0050] 0.125-0.140g of BiVO 4 -8 was dispersed in 25mL deionized water and stirred evenly for 10-20 minutes. Then, under vigorous stirring, 13mL NaBH 4 The solution was slowly added dropwise to the above solution (NaBH 4 / BiVO 4 Molar ratio = 0.18-0.22). After stirring for 1-2 hours, the solution was kept for 1-2 hours. The precipitate was thoroughly washed several times...

Embodiment 2

[0057] BiVO 4 Preparation of:

[0058] Disperse 60 mg of bismuth nitrate pentahydrate in 40 mL of deionized water, sonicate for 10 minutes, and then stir evenly for 20 minutes. Subsequently, 100 mg of sodium orthovanadate was added to the mixed solution. After stirring for 1 hour, the solutions were transferred to a hydrothermal reactor and kept at 160 °C for 8 hours respectively. The yellow powder was washed more than 3 times with deionized water and absolute ethanol, such as figure 1 As shown, the BiVO 4 -8. Bi / BiVO 4 Preparation of:

[0059] With BiVO 4 -8 is the substrate, NaBH 4 solution as reducing agent, prepared Bi / BiVO 4 composite material. 0.125gBiVO 4 -8 was dispersed in 25 mL of deionized water and stirred evenly for 20 minutes. Then under vigorous stirring (NaBH 4 / BiVO 4 Molar ratio=0.2) will 13mL NaBH 4 The solution was slowly added dropwise to the above solution. After stirring for 1 hour, the solution was maintained for 1 hour. The precipitate...

Embodiment 3

[0066] BiVO 4 Preparation of:

[0067] Disperse 60 mg of bismuth nitrate pentahydrate in 40 mL of deionized water, sonicate for 10 minutes, and then stir evenly for 20 minutes. Subsequently, 100 mg of sodium orthovanadate was added to the mixed solution. After stirring for 1 hour, the solutions were transferred to a hydrothermal reactor and kept at 160 °C for 8 hours respectively. The yellow powder was washed more than 3 times with deionized water and absolute ethanol to obtain BiVO 4 -8.

[0068] Bi / BiVO 4 Preparation of:

[0069] With BiVO 4 -8 is the substrate, NaBH 4 solution as reducing agent, prepared Bi / BiVO 4 composite material. 0.125gBiVO 4 -8 was dispersed in 25 mL of deionized water and stirred evenly for 20 minutes. Then under vigorous stirring (NaBH 4 / BiVO 4 Molar ratio=0.18) will 13mL NaBH 4 The solution was slowly added dropwise to the above solution. After stirring for 1 hour, the solution was maintained for 1 hour. The precipitate was thorough...

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Abstract

The invention discloses a preparation method of a Bi / BiVO4-CdS photocatalyst rich in oxygen vacancies. The preparation method comprises the following specific steps: step 1, preparation of BiVO4; step2, preparation of Bi / BiVO4; and step 3, preparation of Bi / BiVO4-CdS: adding Bi / BiVO4 into deionized water containing cadmium acetate dihydrate, stirring the solution for 30 minutes to realize the preferential absorption of Cd<2+> on the Bi / BiVO4 surface, adding thiourea into the solution, keeping the solution at a temperature of 80-100 DEG C for 20-40 minutes, washing a precipitate with deionizedwater multiple times, and drying the precipitate in a vacuum oven to obtain the Bi / BiVO4-CdS photocatalyst. The Bi / BiVO4-CdS photocatalyst rich in oxygen vacancies provided by the invention has the advantages of high tetracycline degradation efficiency under visible light, high tetracycline degradation rate and favorable economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a Bi / BiVO rich in oxygen vacancies 4 - Preparation method of CdS photocatalyst. Background technique [0002] Tetracyclines, an emerging class of organic pollutants widely used to treat human and animal diseases, have attracted widespread public attention due to rising incidents of antibiotic resistance. Tetracycline, the most common broad-spectrum antibiotic, is widely used to treat bacterial infections and as an additive to promote growth in a variety of aquaculture animals. However, a large amount of tetracycline use also brings serious harm to the environment. Therefore, it is of high scientific significance to study the efficient removal of tetracycline. [0003] At present, biological treatment, reverse osmosis, extraction and adsorption methods are widely used to remove tetracycline, but these methods require a long time, complicated treatment process, and produce s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J23/22B01J37/10B01J37/16B01J37/03C02F1/30C02F101/38C02F101/34
CPCB01J27/04B01J23/22B01J23/002B01J37/10B01J37/16B01J37/035C02F1/30C02F2101/38C02F2101/34C02F2305/10B01J35/39Y02E60/36Y02W10/37
Inventor 武占省薛永涛何秀方田飞李云锋张洛红
Owner XI'AN POLYTECHNIC UNIVERSITY
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