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A kind of preparation method and application of nano flake bismuth oxide

A technology of nanosheets and uses, applied in the field of semiconductor photocatalysts, can solve problems such as the inability to effectively improve the photocatalyst's ability to remove target pollutants, the inability to make good use of visible light, and the complex preparation process of the photocatalyst, so as to achieve enhanced photocatalysis. Performance, low cost, longevity effect

Inactive Publication Date: 2021-02-23
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) Since the pure phase α-Bi 2 o 3 The absorption wavelength range is narrow, and the absorption range is mainly below 438nm, so it cannot make good use of visible light. If it is degraded in the process of ultraviolet light irradiation, it will harm the human body, and it is not suitable for ultraviolet light irradiation in many occasions;
[0008] (2) Although the pure phase of β-Bi 2 o 3 α-Bi 2 o 3 Has a narrower bandgap, but the pure phase of β-Bi 2 o 3 The visible light absorption range is still narrow, the utilization rate of visible light is not high, and the pure phase of β-Bi 2 o 3 Electron-hole pairs are easy to recombine, the photocatalytic activity is not high enough, and the quantum efficiency is low;
[0009] (3) Only through β-Bi 2 o 3 Composite modification with other semiconductor materials cannot effectively improve the ability of photocatalysts to remove target pollutants, and the preparation process of photocatalysts is relatively complicated

Method used

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  • A kind of preparation method and application of nano flake bismuth oxide
  • A kind of preparation method and application of nano flake bismuth oxide
  • A kind of preparation method and application of nano flake bismuth oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. In the first step, add 0.1g of polyaniline into 50mL of nitric acid solution (1mol / L), and stir for 1h;

[0038] 2. In the second step, add 1.5 g of bismuth chloride to the turbid solution obtained in the first step, and stir to dissolve at 50° C.;

[0039] 3. In the third step, add 120 mL of 0.6 mol / L Na dropwise to the turbid solution obtained in the second step 2 CO 3 Solution, after the dropwise addition, the reaction system was aged at 45°C for 24h;

[0040] 4. The fourth step is to centrifuge the product of the third step, wash the obtained precipitate with butanol and ultrapure water three times respectively, and dry at 60°C, put the dried powder in a muffle furnace and roast at 300°C for 1h, that is C / N doped β-Bi available 2 o 3 Nanosheets.

[0041] 5 mg of the resulting C / N doped β-Bi 2 o 3 Nanosheets were added to 10 mL of 3 mg / L EE2 solution. After 30 min in the dark, the photocatalytic degradation was carried out under the irradiation of a 500W x...

Embodiment 2

[0043] 1. In the first step, add 0.1g of polyaniline into 60mL of nitric acid solution (1.5mol / L) and stir for 1h;

[0044] 2. In the second step, add 1 g of bismuth sulfate to the turbid solution obtained in the first step, and stir to dissolve at 60° C.;

[0045] 3. In the third step, add 120 mL of 0.6 mol / L Na dropwise to the turbid solution obtained in the second step 2 CO 3 Solution, after the dropwise addition, the reaction system was aged at 60°C for 7h;

[0046] 4. The fourth step is to centrifuge the product of the third step, wash the obtained precipitate with ethanol and ultrapure water three times respectively, and dry at 60°C, put the dried powder in a muffle furnace and roast at 350°C for 1h, that is C / N doped β-Bi available 2 o 3 Nanosheets.

[0047] 5 mg of the resulting C / N doped β-Bi 2 o 3 Nanosheets were added to 10 mL of 3 mg / L BPA solution. After 30 min in the dark, the photocatalytic degradation was carried out under the irradiation of a 500W xeno...

Embodiment 3

[0049] 1. In the first step, add 0.15g of polyaniline into 70mL of nitric acid solution (1mol / L), and stir for 1h;

[0050] 2. In the second step, add 1.5 g of bismuth nitrate to the turbid solution obtained in the first step, and stir to dissolve at 40°C;

[0051] 3. In the third step, add 160 mL of 0.6 mol / L Na dropwise to the turbid solution obtained in the second step 2 CO 3 Solution, after the dropwise addition, the reaction system was aged at 55°C for 7h;

[0052] 4. The fourth step is to centrifuge the product of the third step, wash the obtained precipitate with DMF and ultrapure water three times respectively, and dry at 60°C, put the dried powder in a muffle furnace and roast at 350°C for 1h, that is C / N doped β-Bi available 2 o 3 Nanosheets.

[0053] 5 mg of the resulting C / N doped β-Bi 2 o 3 Nanosheets were added to 10 mL of 3 mg / L EE2 solution. After 30 min in the dark, the photocatalytic degradation was carried out under the irradiation of a 500W xenon la...

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Abstract

The invention belongs to the field of semiconductor photocatalysts, in particular to a C / N doped β-Bi 2 o 3 Synthesis method and application of nanosheets. Add 0.01‑0.4g of C / N source material to 50‑100mL of nitric acid solution (0.5‑1.5mol / L), and stir for 1h. Add 1-5g bismuth source substance to the above cloudy liquid, stir and dissolve at 40-60°C. Then add 120-160mL 0.6mol / L Na dropwise 2 CO 3 Solution, after the dropwise addition, the reaction system is aged at 40-60°C for 6-24h. After centrifugation, the obtained precipitate was washed three times with washing solvent and ultrapure water respectively, and dried at 60°C. The dried powder was put into a muffle furnace and roasted at 300‑380°C for 0.5‑8h to obtain C / N doped hetero β‑Bi 2 o 3 Nanosheets. The material prepared by the present invention is used to degrade environmental endocrine disruptors in water, and the material is synthesized by precipitation method relative to β-Bi 2 o 3 Powder and P25 have higher visible light catalytic activity, which can realize rapid visible light degradation and removal of target pollutants.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysts, in particular to a kind of C element and N element co-doped nano-sheet β-Bi 2 o 3 method and use. Background technique [0002] Environmental endocrine disrupting chemicals (Endocrine Disrupting Chemicals, referred to as EDCs) refer to a class of substances that can affect the nervous system, reproductive system, metabolism, immune system and Exogenous substances for the function of the cardiovascular system. Environmental endocrine disruptors can be divided into natural and synthetic. Natural ones such as natural estrogen and phytoestrogens, synthetic ones include some pharmaceutical preparations, pesticides and various industrial chemicals, such as bisphenol A (BPA), 17-α-ethinyl estradiol (EE2), 4 -n-nonylphenol (NP), 4-t-octylphenol (OP), diethylstilbestrol (DES), tetrabromobisphenol A (TBBPA), etc. Since the 1990s, when relevant researchers discovered that estrogen in water c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18C02F1/30C02F101/30
CPCB01J23/18C02F1/30C02F2101/30
Inventor 蒋峰芝张叶飞史颖颖陈宇王珊龙艳菊李领鑫
Owner YUNNAN UNIV