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Bi2WO6 / BiVO4 heterojunction composite photocatalyst, preparation method and application thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problems of limited photocatalytic performance, easy recombination of photogenerated carriers, slow photoelectron-hole separation, etc., and achieves high-efficiency photocatalytic activity, simple preparation method, The effect of large specific surface area

Inactive Publication Date: 2016-04-06
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the slow photoelectron-hole separation in monomeric photocatalysts and the easy recombination of photogenerated carriers, the photocatalytic performance is limited. However, the construction of composite materials through semiconductor recombination can accelerate electron-hole separation and improve the photocatalytic performance of materials. [5,6]

Method used

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  • Bi2WO6 / BiVO4 heterojunction composite photocatalyst, preparation method and application thereof
  • Bi2WO6 / BiVO4 heterojunction composite photocatalyst, preparation method and application thereof
  • Bi2WO6 / BiVO4 heterojunction composite photocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Bi 2 WO 6 / BiVO 4 Preparation method of heterojunction composite photocatalyst:

[0041] Prepared by hydrothermal synthesis. Weigh 3.0mmolBi(NO 3 ) 3 ·5H 2 O was added to 30.0mL2.0mol / LHNO 3 solution, stirred magnetically until the Bi(NO 3 ) 3 ·5H 2 O is completely dissolved to obtain solution A; at the same time, 1.0mmolNa 2 WO 4 2H 2 O and 1.0 mmol NH 4 VO 3 Add to 30.0mL2.0mol / L NaOH solution, heat to 80°C and magnetically stir to dissolve completely, then add 0.5g of polyvinylpyrrolidone (PVP), and magnetically stir until completely dissolved to obtain solution B; then, under magnetic stirring Add the above-mentioned B solution dropwise to the above-mentioned A solution to obtain a suspension, and then use 2.0mol / LNH 3 ·H 2O solution to adjust the pH of the suspension to 7, and then continue to stir for 60 minutes; after the stirring is completed, transfer the suspension to a high-pressure reactor equipped with a polytetrafluoroethylene liner, and pu...

Embodiment 2

[0052] Bi 2 WO 6 / BiVO 4 Preparation method of heterojunction composite photocatalyst:

[0053] Prepared by hydrothermal synthesis, the difference from Example 1 is that the control of Bi 2 WO 6 with BiVO 4 The molar ratio is 1:0.75. Weigh 2.75mmolBi(NO 3 ) 3 ·5H 2 O was added to 30.0mL2.0mol / LHNO 3 solution, stirred magnetically until the Bi(NO 3 ) 3 ·5H 2 O is completely dissolved to obtain solution A; at the same time, 1.0mmolNa 2 WO 4 2H 2 O and 0.75 mmol NH 4 VO 3 Add to 30.0mL2.0mol / L NaOH solution, heat to 80°C and magnetically stir to dissolve completely, then add 0.5g of polyvinylpyrrolidone (PVP), and magnetically stir until completely dissolved to obtain solution B; then, under magnetic stirring Add the above-mentioned B solution dropwise to the above-mentioned A solution to obtain a suspension, and then use 2.0mol / LNH 3 ·H 2 O solution to adjust the pH of the suspension to 7, and then continue to stir for 60 minutes; after the stirring is complet...

Embodiment 3

[0055] Bi 2 WO 6 / BiVO 4 Preparation method of heterojunction composite photocatalyst:

[0056] Prepared by hydrothermal synthesis, the difference from Example 1 is that the control of Bi 2 WO 6 with BiVO 4 The molar ratio is 1:0.5. Weigh 2.5mmolBi(NO 3 ) 3 ·5H 2 O was added to 30.0mL2.0mol / LHNO 3 solution, stirred magnetically until the Bi(NO 3 ) 3 ·5H 2 O is completely dissolved to obtain solution A; at the same time, 1.0mmolNa 2 WO 4 2H 2 O and 0.5 mmol NH 4 VO 3 Add to 30.0mL2.0mol / L NaOH solution, heat to 80°C and magnetically stir to dissolve completely, then add 0.5g of polyvinylpyrrolidone (PVP), and magnetically stir until completely dissolved to obtain solution B; then, under magnetic stirring Add the above-mentioned B solution dropwise to the above-mentioned A solution to obtain a suspension, and then use 2.0mol / LNH 3 ·H 2 O solution to adjust the pH of the suspension to 7, and then continue to stir for 60 minutes; after the stirring is completed,...

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Abstract

The present invention belongs to the field of photocatalysis, and in particular to a Bi2WO6 / BiVO4 composite photocatalyst and a preparation method and application thereof. The Bi2WO6 / BiVO4 heterojunction composite photocatalyst is a catalyst with a three-dimensional layered nest-like structure and formed by Bi2WO6 and BiVO4, wherein the molar ratio of Bi2WO6 to BiVO4 is 1:0.05-10. A simple one-step hydrothermal method is employed for preparation of the Bi2WO6 / BiVO4 heterojunction composite photocatalyst. The preparation method of the present invention is simple, easy to control and low in cost; the constructed Bi2WO6 / BiVO4 heterojunction structure with visible light response and large specific surface area accelerates the separation of photo-generated carriers, reduces the recombination rate of photo-generated electron-hole pair, has high photocatalytic activity and stability under visible light, and highly efficient killing effect on harmful micro-organisms and dye pollutants in water, and shows good practical value and potential applications in the fields of water purification and marine antifouling.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a Bi 2 WO 6 / BiVO 4 Heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, with the rapid development of science and technology and industrial technology, the problem of environmental pollution has become increasingly serious, especially the water resources that human beings rely on have been polluted to varying degrees. Water resource pollution has become a direct threat to human survival. solved problem. On the other hand, due to the excessive use of fossil energy, it has caused an increasingly serious energy crisis and also caused serious environmental pollution. Therefore, energy shortage and environmental pollution are two great challenges facing the world today, seriously restricting the sustainable development of human beings, and seriously endangering human health. Therefore, people pay more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C02F1/30C02F1/50C02F101/38
CPCY02W10/37B01J23/002B01J23/31B01J2523/00C02F1/30C02F1/50C02F2101/38C02F2305/10
Inventor 鞠鹏张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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