Bismuth oxide/bismuth tetroxide heterojunction photocatalyst and its preparation method and application

Abstract

The invention provides a Bi 2 o 3 / Bi 2 o 4 Preparation method and application of phase heterojunction photocatalyst. First, mix 2.8 g of bismuth salt and 0‑1.87 g of alkali to make a paste. Then put the mixture into a muffle furnace and calcinate at 100-450°C for 0.5-4.0 h. Then the obtained calcined product was washed with deionized water and dried at 60°C to obtain a khaki to reddish brown solid, namely Bi 2 o 3 / Bi 2 o 4 heterojunction photocatalysts. Bi prepared by the present invention 2 o 3 / Bi 2 o 4 A phase-heterojunction photocatalyst for the degradation of organic pollutants in water, which is relatively 2 o 3 Photocatalysts have higher catalytic activity under visible light.

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. ...

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

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