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Preparation method of heterojunction visible-light-induced photocatalyst and application thereof

A photocatalyst and heterojunction technology, applied in the field of environmental remediation and pollution control, can solve the problems of recyclability and catalytic efficiency that cannot be achieved, large particle size, and low catalytic efficiency.

Active Publication Date: 2020-06-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material prepared by this method has a large particle size and a low specific surface area, resulting in its recyclability and catalytic efficiency still unable to meet the needs of actual production, so some scholars proposed to use Bi 2 WO 6 -TiO 2 The catalyst is immobilized on glass, quartz, fabric and other substrates (Zoufei Du: Enhanced photocatalytic activity of Bi 2 WO 6 / TiO 2 composite coated polyesterfabric under visible light irradiation) or use precious metals and other substances to Bi 2 WO 6 -TiO 2 Carry out modification (a kind of composite photocatalyst and preparation method thereof: CN106984312A; A kind of visible light photocatalysis TiO 2 / CQDs / Bi 2 WO 6 Its preparation method and application: CN109046322A) to improve the defect of hydrothermal synthesis method
It is undeniable that these improved methods have improved the photocatalytic activity to a certain extent, however, the composition of multi-component catalysts is complex and the production process is cumbersome, which makes it difficult to achieve a large number of synthesis, resulting in an increase in the actual application cost
It is precisely due to the defects of low catalytic efficiency and difficult recovery that further limit the preparation of Bi by hydrothermal synthesis. 2 WO 6 -TiO 2 Development and application of photocatalytic technology

Method used

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  • Preparation method of heterojunction visible-light-induced photocatalyst and application thereof
  • Preparation method of heterojunction visible-light-induced photocatalyst and application thereof
  • Preparation method of heterojunction visible-light-induced photocatalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This example provides Bi 2 WO 6 The preparation method of P25 heterojunction visible light catalyst comprises the following steps:

[0033] (1) Add 80 g of sucrose into 500 mL of deionized water, stir magnetically for 60 min to dissolve the sucrose, transfer it to a polytetrafluoroethylene-lined reactor, put it into a muffle furnace and burn it at 200 °C for 2 h. After cooling, wash with deionized water and absolute ethanol three times respectively, and dry the obtained precipitate in an oven at 80°C to obtain a carbon microsphere template.

[0034] (2) 2mmol Bi(NO 3 ) 3 ·5H 2 O and 1 mmol Na 2 WO 4 2H 2 O was dissolved in 80 mL of ethylene glycol to form a mixed solution, stirred magnetically for 10 min, continued to add 0.5 g of carbon microspheres and stirred for 30 min, then added 6 mmol P25, stirred in a water bath at 60 °C for 6 h, and centrifuged with deionized water and absolute ethanol. Impurities were removed by washing 3 times, and the obtained substa...

Embodiment 2

[0049] (1) Add 80 g of sucrose to 500 mL of deionized water, stir magnetically for 40 min to dissolve the sucrose, transfer it to a polytetrafluoroethylene-lined reactor, put it into a muffle furnace and burn at 190°C for 2 h. After cooling, wash with deionized water and absolute ethanol three times respectively, and dry the obtained precipitate in an oven at 60°C to obtain a carbon microsphere template.

[0050] (2) 2mmol Bi(NO 3 ) 3 ·5H 2 O and 1 mmol Na 2 WO 4 2H 2 O was dissolved in 80 mL of ethylene glycol to form a mixed solution, stirred magnetically for 8 min, continued to add 0.3 g of carbon microspheres and stirred for 30 min, then added 3 mmol P25, stirred in a water bath at 60 °C for 6 h, and centrifuged with deionized water and absolute ethanol. Impurities were removed by washing 3 times, and the obtained substance was dried at 60° C. for 12 hours.

[0051] (3) Transfer the dried powder to a crucible, put it into a muffle furnace and burn it at 400°C for 5 h...

Embodiment 3

[0053](1) Add 100 g of sucrose to 500 mL of deionized water, stir magnetically for 50 min to dissolve the sucrose, transfer it to a polytetrafluoroethylene-lined reaction kettle, put it into a muffle furnace and burn at 200°C for 2.5 h. After cooling, wash with deionized water and absolute ethanol three times respectively, and dry the obtained precipitate in an oven at 70°C to obtain a carbon microsphere template.

[0054] (2) 3mmol Bi(NO 3 ) 3 ·5H 2 O and 1.5 mmol Na 2 WO 4 2H 2 O was dissolved in 80mL of ethylene glycol to form a mixed solution, stirred magnetically for 9min, continued to add 0.4g of carbon microspheres and stirred for 45min, then added 6mmol P25, stirred in a water bath at 65°C for 7h, and centrifuged with deionized water and absolute ethanol respectively. Impurities were removed by washing 3 times, and the obtained substance was dried at 70° C. for 12 hours.

[0055] (3) Transfer the dried powder to a crucible, put it into a muffle furnace and burn i...

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Abstract

The invention relates to a preparation method of a heterojunction visible-light-induced photocatalyst and an application thereof. The method comprises the followings steps: preparing carbon microspheres; then, dissolving Bi(NO3)3.5H2O and Na2WO4.2H2O into ethylene glycol to obtain a solution; adding carbon microspheres into the solution, stirring, adding P25, stirring in a water bath at 60-70 DEGC for 6-8 hours, centrifuging the solution, washing with deionized water and absolute ethyl alcohol to remove impurities, and drying the obtained substance at 60-80 DEG C; putting the dried powder into a muffle furnace, firing at 400-450 DEG C until a carbon microsphere template is completely removed, and obtaining the heterojunction catalyst Bi2WO6 / P25. The catalyst has a large specific surface area, provides rich reaction sites for pollutants, and further improves the removal efficiency of the pollutants. The Bi2WO6 / P25 photocatalyst can achieve the adsorption efficiency of 33%-35% on tetracycline and the final degradation efficiency of 87%-90%.

Description

technical field [0001] The invention belongs to the field of environmental restoration and pollution control, and specifically relates to a preparation method and application of a heterojunction visible light catalyst. The catalyst is used to efficiently degrade tetracycline under visible light. Background technique [0002] At present, the application of semiconductor photocatalysts in pollution degradation has attracted extensive attention in modern society. How to develop catalysts for more efficient use of solar energy (especially visible light) has become a research focus in the field. TiO 2 It has high application value because of its characteristics of non-toxicity, stability and no secondary pollution. However, TiO 2 The main disadvantages of 195 are its wide bandgap (3.2 eV) that can only be excited by ultraviolet light, and the hole-electron pair separation efficiency is low, which limits its utilization under sunlight. Therefore, all walks of life have propose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C02F1/30C02F1/28C02F101/38C02F101/34C02F101/36
CPCB01J23/31B01J23/002C02F1/30C02F1/281B01J2523/00C02F2305/10C02F2101/38C02F2101/34C02F2101/36B01J35/39B01J2523/47B01J2523/54B01J2523/69Y02W10/37
Inventor 鲁金凤任泽群温康鑫侯之琳魏连雪田俊丽胡家琦廖洋
Owner NANKAI UNIV
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