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Preparation method and application of Bi3O4Br/CuBi2O4 bimetallic heterojunction catalyst

A heterojunction and catalyst technology, applied in the field of environmental remediation and pollution control, can solve the problems of complex material preparation methods and long degradation time of pollutants, and achieve the effect of simple synthesis method and low cost of raw materials

Active Publication Date: 2021-08-20
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material preparation method is complex, requires noble metal doping, and the degradation time of pollutants is long

Method used

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  • Preparation method and application of Bi3O4Br/CuBi2O4 bimetallic heterojunction catalyst
  • Preparation method and application of Bi3O4Br/CuBi2O4 bimetallic heterojunction catalyst
  • Preparation method and application of Bi3O4Br/CuBi2O4 bimetallic heterojunction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Bi 3 o 4 Br / CuBi 2 o 4 The preparation method of bimetallic heterojunction catalyst comprises the following steps:

[0035] (1) Add 0.7gBi(NO 3 ) 3 ·5H 2 O, 0.6gNaBr and 0.6gPVP are dissolved in 45mL mannitol aqueous solution to obtain mixed solution 1, the concentration of mannitol aqueous solution is 0.1mol / L, use the NaOH aqueous solution that concentration is 1mol / L to adjust the pH value of above-mentioned mixed solution 1 then to be 11 , and then transferred the mixed solution 1 to a 100mL Teflon-lined stainless steel autoclave for hydrothermal synthesis at 150°C for 24h, cooled naturally to below 60°C, washed alternately with deionized water and ethanol three times, and dried at 60°C for 12h to obtain Bi 3 o 4 Br powder;

[0036] (2) Set 0.02gBi 3 o 4 Br powder, 0.2gCu(NO 3 ) 2 ·3H 2 O, 0.9gBi(NO 3 ) 3 ·5H 2 O and 0.3g NaOH were sequentially added to 30mL deionized water, mixed and stirred to obtain a mixed solution 2, and then the mixed solution...

Embodiment 2

[0039] Bi 3 o 4 Br / CuBi 2 o 4 The preparation method of bimetallic heterojunction catalyst comprises the following steps:

[0040] (1) Add 0.8gBi(NO 3 ) 3 ·5H 2 O, 0.65gNaBr and 0.65gPVP are dissolved in 50mL mannitol aqueous solution to obtain mixed solution 1, and the concentration of mannitol aqueous solution is 0.15mol / L, then use the NaOH aqueous solution that concentration is 2mol / L to adjust the pH value of above-mentioned mixed solution 1 to be 11.5 , and then transferred the mixed solution 1 to a 100mL Teflon-lined stainless steel autoclave for hydrothermal synthesis at 160°C for 24h, cooled naturally to below 60°C, washed with deionized water and ethanol three times alternately, and dried at 70°C for 12h to obtain Bi 3 o 4 Br powder;

[0041] (2) Set 0.03gBi 3 o 4 Br powder, 0.25gCu(NO 3 ) 2 ·3H 2 O, 0.95gBi(NO 3 ) 3 ·5H 2 O and 0.35g NaOH were sequentially added to 35mL deionized water, mixed and stirred to obtain a mixed solution 2, and then the mi...

Embodiment 3

[0044] Bi 3 o 4 Br / CuBi 2 o 4 The preparation method of bimetallic heterojunction catalyst comprises the following steps:

[0045] (1) Add 0.85gBi(NO 3 ) 3 ·5H 2 O, 0.7gNaBr and 0.7gPVP are dissolved in 50mL mannitol aqueous solution to obtain mixed solution 1, and the concentration of mannitol aqueous solution is 0.1mol / L, then use the NaOH aqueous solution that concentration is 2mol / L to adjust the pH value of above-mentioned mixed solution 1 to be 11.5 , and then transferred the mixed solution 1 to a 100mL Teflon-lined stainless steel autoclave for hydrothermal synthesis at 160°C for 18h, cooled naturally to below 60°C, washed alternately with deionized water and ethanol three times, and dried at 70°C for 8h to obtain Bi 3 o 4 Br powder;

[0046] (2) Set 0.03gBi 3 o 4 Br powder, 0.25gCu(NO3 ) 2 ·3H 2 O, 0.95gBi(NO 3 ) 3 ·5H 2 O and 0.35g NaOH were sequentially added to 35mL deionized water, mixed and stirred to obtain a mixed solution 2, and then the mixed s...

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Abstract

The invention discloses a preparation method of a Bi3O4Br / CuBi2O4 bimetallic heterojunction catalyst, which comprises the following steps: dissolving Bi(NO3)3.5H2O, NaBr and PVP (Polyvinyl Pyrrolidone) in a mannitol aqueous solution, adjusting the pH value of the obtained mixed solution 1 to 11-12, transferring the solution into a reaction kettle for hydrothermal synthesis, naturally conducting cooling, alternately conducting washing with deionized water and ethanol, and conducting drying to obtain Bi3O4Br powder; and sequentially adding Bi3O4Br powder, Cu(NO3)2.3H2O, Bi(NO3)3.5H2O and NaOH into water, conducting stirring to obtain a mixed solution 2, transferring the mixed solution 2 into a reaction kettle, carrying out hydrothermal synthesis, naturally conducting cooling, and conducting washing and drying to obtain the bimetallic heterojunction catalyst. Therefore, the rate of photo-induced electron hole recombination can be reduced, the preparation method is simple, the catalytic efficiency of the prepared catalyst is high, and various active oxygen species can be generated.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration and pollution control, and more specifically relates to a Bi 3 o 4 Br / CuBi 2 o 4 A preparation method and application of a bimetallic heterojunction catalyst, the catalyst is used to couple persulfate under visible light to remove residual antibiotics in water. Background technique [0002] In recent years, antibiotics have been widely used in the treatment of human diseases, animal husbandry and aquaculture. If they cannot be effectively treated, a large amount of antibiotics will remain in the water environment. Sewage treatment plants are the main source of antibiotics released into the environment. However, Many studies have reported that antibiotics, especially tetracycline, are frequently detected in sewage treatment plants, and it is difficult to effectively remove these emerging pollutants through conventional sewage treatment processes. Therefore, it is necessary to f...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J37/10C02F1/30C02F1/72C02F101/30C02F101/34C02F101/38
CPCB01J27/043B01J37/10C02F1/30C02F1/722C02F1/725C02F2305/023C02F2305/10C02F2101/30C02F2101/34C02F2101/38B01J35/39Y02W10/37
Inventor 鲁金凤田俊丽胡家琦倪琳洁毛洁
Owner NANKAI UNIV
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