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Bismuth oxide/bismuth tetraoxide heterojunction photocatalyst, preparation method and use thereof

A photocatalyst and heterojunction technology, applied in the field of photocatalysis, can solve the problems of easy recombination of photogenerated electrons and holes, high production cost, and increased synthesis cost, so as to achieve high visible photocatalytic activity, save synthesis cost, shorten The effect of the synthesis cycle

Active Publication Date: 2018-07-13
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, a single Bi 2 o 3 There are still the following problems: the photogenerated electrons and holes are easy to recombine, and the photocatalytic activity is low
[0011] 1. The synthesis method is complex and the production cost is high;
[0012] 2. The temperature required in the reaction process or calcination process is high, the synthesis time is long, the energy consumption is high, and the synthesis cost is also increased;
[0014] 4. The organic solvents used in the preparation process are often toxic, and long-term use is harmful to the body, while increasing environmental pollution during the preparation process;
[0015] 5. The prepared photocatalyst has low activity and cannot achieve efficient and rapid removal of organic pollutants
However, there are very few reports on this type of catalyst, and there are not many studies

Method used

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  • Bismuth oxide/bismuth tetraoxide heterojunction photocatalyst, preparation method and use thereof
  • Bismuth oxide/bismuth tetraoxide heterojunction photocatalyst, preparation method and use thereof
  • Bismuth oxide/bismuth tetraoxide heterojunction photocatalyst, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Grind 2.80 g of bismuth salt and 1.12 g of alkali, and mix them into a paste;

[0044] (2) Put the mixture into a muffle furnace for calcination, the calcination time is 4 h, the calcination temperature is 300 ℃, and the heating rate is 5 ℃ / min;

[0045] (3) Wash the calcined material repeatedly with deionized water, and dry it in an oven at 60 °C to obtain a khaki powder, which is Bi 2 o 3 / Bi 2 o 4 catalyst;

[0046] 5 mg Bi 2 o 3 / Bi 2 o 4 The photocatalyst was added to the EE2 solution with a concentration of 3 mg / L, and after dark reaction for 30 min, the photocatalytic degradation was carried out under the irradiation of visible light (500 W xenon lamp + 420 nm filter). The degradation rate of EE2 can reach 93.5% after 12 min of light exposure.

Embodiment 2

[0048] (1) Grind 2.80 g of bismuth salt and 1.12 g of alkali, and mix them into a paste;

[0049] The mixture was calcined in a muffle furnace, the calcination time was 2 h, the calcination temperature was 250 °C, and the heating rate was 10 °C / min;

[0050] (2) Wash the calcined material repeatedly with deionized water, and dry it in an oven at 60 °C to obtain a khaki powder, which is Bi 2 o 3 / Bi 2 o 4 catalyst;

[0051] 5 mg Bi 2 o 3 / Bi 2 o 4 The photocatalyst was added to the BPA solution with a concentration of 10 mg / L, and after dark reaction for 30 min, the photocatalytic degradation was carried out under the irradiation of visible light (500 W xenon lamp + 420 nm filter). The degradation rate of BPA can reach 80% after being illuminated for 12 minutes.

Embodiment 3

[0053] (1) Grind 2.80 g of bismuth salt and 0.62 g of alkali, and mix them into a paste;

[0054] (2) Put the mixture into a muffle furnace for calcination, the calcination time is 2 h, the calcination temperature is 250 ℃, and the heating rate is 5 ℃ / min;

[0055] (3) Wash the calcined material repeatedly with deionized water, and dry it in an oven at 60 °C to obtain a reddish-brown powder, which is Bi 2 o 3 / Bi 2 o 4 catalyst;

[0056] 5 mg Bi 2 o 3 / Bi 2 o 4 The photocatalyst was added to the EE2 solution with a concentration of 3 mg / L, and after dark reaction for 30 min, the photocatalytic degradation was carried out under the irradiation of visible light (500 W xenon lamp + 420 nm filter). The degradation rate of EE2 can reach 68% after 12 min of light exposure.

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Abstract

The invention provides a preparation method and use of a Bi2O3 / Bi2O4 phase heterojunction photocatalyst. The preparation method comprises the following steps: firstly, mixing 2.8 g of bismuth salt with 0-1.87 g of alkali uniformly to prepare a paste; then, placing a mixture into a muffle furnace and calcining at 100-450 DEG C for 0.5-4.0 h; washing a calcined substance with deionized water; and drying at 60 DEG C to obtain earthy yellow to reddish brown solids which are the Bi2O3 / Bi2O4 heterojunction photocatalyst. The Bi2O3 / Bi2O4 phase heterojunction photocatalyst prepared in the invention isused for degrading organic pollutants in water, and has higher visible light catalyzing activity than a commercial Bi2O3 photocatalyst.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a preparation method and application of a bismuth oxide / bismuth tetroxide heterojunction photocatalyst. Background technique [0002] Endocrine disruptors (EDCs) are a class of environmental pollutants that pose a threat to the health of humans and other animals, interfere with the development of the endocrine system of organisms and interfere with normal metabolism and biological behavior. Endocrine disruptors (EDCs) are ubiquitous in water bodies such as domestic sewage, sewage treatment plant wastewater, and rivers, including natural and synthetic estrogens. Common estrogens include 17β-estradiol (E2), 17α-ethynyl Estradiol (EE2) and estrone (E1), etc. Generally, synthetic hormones are more stable and harder to degrade than natural estrogens, such as EE2. Even if the concentration of EE2 in aqueous solution is only ng / L, it will cause serious environmental threats...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J37/03B01J37/08C02F1/30C02F101/34
CPCC02F1/30B01J23/18B01J37/031B01J37/082C02F2101/34C02F2305/10B01J35/393B01J35/23B01J35/39
Inventor 蒋峰芝龙艳菊李领鑫王珊陈宇王路路张思凤
Owner YUNNAN UNIV
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