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Preparation method of Z-type Bi4O5Br2/MIL-88B (Fe) heterojunction photocatalyst

A bi4o5br2, heterojunction technology, applied in the field of photocatalytic materials, can solve the problems of low photocatalytic efficiency and slowness, and achieve the effects of high photocatalytic efficiency, simple preparation process, and promotion of transfer and separation

Pending Publication Date: 2022-07-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid electron-hole pair complexation of MIL-88B(Fe) under light conditions and the Fe 3+ / Fe 2+ Slow cycle, resulting in generally low photocatalytic efficiency

Method used

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  • Preparation method of Z-type Bi4O5Br2/MIL-88B (Fe) heterojunction photocatalyst
  • Preparation method of Z-type Bi4O5Br2/MIL-88B (Fe) heterojunction photocatalyst
  • Preparation method of Z-type Bi4O5Br2/MIL-88B (Fe) heterojunction photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of MIL-88B(Fe):

[0039] Add 0.54g ferric chloride and 0.332g terephthalic acid to 20mL N,N-dimethylformamide, stir for 10min, add 0.8mL sodium hydroxide (2M), continue stirring for 30min, transfer to 50mL polytetrafluoroethylene In a vinyl fluoride hydrothermal kettle, heat at 120°C for 12h. After cooling to room temperature, the samples were washed with deionized water and ethanol, and then the samples were dried at 60 °C for 12 h.

[0040] (2) Bi 4 O 5 Br 2 Preparation of / MIL-88B(Fe) (0.3wt%):

[0041] Dissolve 0.485g of bismuth nitrate and 0.0008g of MIL-88B(Fe) in 40mL of ethylene glycol, stir and ultrasonicate for 30min, add 0.119g of potassium bromide, stir and ultrasonicate for 5min, add 20mL of ammonia water, and stir for 5h. Washed with deionized water, and dried at 60 °C for 12 h.

Embodiment 2

[0043] (1) Preparation of MIL-88B (Fe): same as Example 1;

[0044] (2) Bi 4 O 5 Br 2 Preparation of / MIL-88B(Fe) (0.1wt%):

[0045] Dissolve 0.485g of bismuth nitrate and 0.0003g of MIL-88B(Fe) in 40mL of ethylene glycol, stir and ultrasonicate for 30min, add 0.119g of potassium bromide, stir and ultrasonicate for 5min, add 20mL of ammonia water, stir for 5h, the obtained product is mixed with ethanol and Washed with deionized water, and dried at 60 °C for 12 h.

Embodiment 3

[0047] (1) Preparation of MIL-88B (Fe): same as Example 1;

[0048] (2) Bi 4 O 5 Br 2 Preparation of / MIL-88B(Fe) (0.5wt%):

[0049] Dissolve 0.485g of bismuth nitrate and 0.0013g of MIL-88B(Fe) in 40mL of ethylene glycol, stir and ultrasonicate for 30min, add 0.119g of potassium bromide, stir and ultrasonicate for 5min, add 20mL of ammonia water, stir for 5h, the obtained product is mixed with ethanol and Washed with deionized water, and dried at 60 °C for 12 h.

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Abstract

The invention discloses a preparation method of a Z-type Bi4O5Br2 / MIL-88B (Fe) heterojunction photocatalyst, which comprises the following steps: adding ferric chloride and terephthalic acid into an N, N-dimethylformamide DMF solution, stirring to fully dissolve, adding sodium hydroxide to adjust the pH value, continuously stirring, then carrying out hydrothermal reaction on the mixed solution in a sealed state, cooling to room temperature, centrifuging, and drying to obtain the Z-type Bi4O5Br2 / MIL-88B (Fe) heterojunction photocatalyst. The obtained solid material is washed, dried and ground, and MIL-88B (Fe) is obtained; the preparation method comprises the following steps: dissolving MIL-88B (Fe) and bismuth nitrate in an ethylene glycol solvent, adding a bromine source, uniformly stirring, adjusting the pH value to form a mixed solution, completely reacting, centrifuging, washing, drying and grinding to obtain the Bi4O5Br2 / MIL-88B (Fe) photocatalytic material. Appropriate energy band matching of the two semiconductors and tight interface interaction between the two semiconductors effectively promote transfer and separation of photo-induced electron-hole pairs, and compared with independent Bi4O5Br2 and MIL-88B (Fe), the redox capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a Z-type Bi 4 O 5 Br 2 / Preparation method of MIL-88B(Fe) heterojunction photocatalyst. Background technique [0002] The entire human scientific and technological civilization is closely linked to fossil energy. The dependence on fossil energy has led to the crisis of energy depletion, and the continuous exploitation of fossil energy has emitted a large amount of greenhouse gases, which not only affects the growth of animals and plants and human health, but also causes disasters. Sexual weather causes environmental damage and seriously reduces the quality of human life. Therefore, the rapid consumption of energy and the aggravation of environmental pollution have become the bottleneck restricting the development of human beings, and it is also a problem that people need to solve urgently. [0003] Solar energy is an abundant, clean energy source ideal for fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C02F1/30C02F101/38
CPCB01J31/2239B01J31/1691C02F1/30B01J2531/842C02F2101/38C02F2305/10B01J35/39Y02W10/37
Inventor 陈海群何光裕钱惺悦马宇夏佳伟徐辉袁菁菁
Owner CHANGZHOU UNIV