Copper sulfide/bismuth vanadate heterojunction photocatalyst and preparation method thereof

Abstract

The invention discloses a copper sulfide/bismuth vanadate heterojunction photocatalyst and a preparation method thereof. The copper sulfide/bismuth vanadate heterojunction photocatalyst comprises a copper sulfide and bismuth vanadate, and the copper sulfide is attached to the bismuth vanadate. The preparation method comprises the following steps: preparing a suspension of bismuth vanadate and copper nitrate; preparing a suspension liquid of bismuth vanadate, copper nitrate and sodium thiosulfate; carrying out water bath reaction on the suspension liquid of bismuth vanadate, copper nitrate andsodium thiosulfate to obtain the copper sulfide/bismuth vanadate heterojunction photocatalyst. The copper sulfide/bismuth vanadate heterojunction photocatalyst has the advantages of being wide in visible light response range, high in quantum efficiency, high in photocatalytic activity and the like, is a novel semiconductor photocatalytic material, and has good application value and application prospect, the catalyst prepared by the preparation method is high in crystallization degree, free of impurities in the preparation process, simple in process, mild in reaction conditions, convenient to operate, clean, pollution-free and the like, is suitable for large-scale preparation, and is convenient for industrial utilization.

Description

technical field [0001] The invention belongs to the field of functional nanometer materials, and relates to a heterojunction semiconductor photocatalyst and a preparation method thereof, in particular to a copper sulfide / bismuth vanadate heterojunction photocatalyst and a preparation method thereof. Background technique [0002] With the continuous development of medicine and the increase of people's demand for medical supplies such as drugs, more and more pharmaceutical factories have emerged as the times require. Among the drugs produced, antibiotics are widely used to treat bacterial infections. However, during the production of antibiotics, due to improper management of the wastewater containing antibiotics discharged by the factory, the wastewater is discharged into rivers and lakes, and then the pollutants in the water Accumulate in the environment and cause harm to aquatic organisms. In order to solve the pollution problem, many technologies for degrading antibiotics...

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Problems solved by technology

Recently, sulfide has been widely explored by many famous scholars due to its narrow band gap and good visible light absorption ability, but it still has the problem of rapid recombination of photogenerated carriers, which also limits its practical application.

In addition, in the prior art, when sulfide and bismuth vanadate are combined, there are still problems such as narrow visible light absorption range, high carrier recombination efficiency, and insufficient photocatalytic activity in the composite material formed, such as cadmium sulfide and bismuth vanadate. Composite materials have problems such as narrow visible light absorption range, high carrier recombination efficiency, and insufficient photocatalytic activity.

In addition, there are still the following problems in the preparation process of copper sulfide / bismuth vanadate heterojunction: (1) In the process of composite material preparation, too much or too little bismuth vanadate will have a serious impact on the photocatalytic performance of the composite material (2) In the preparation process of composite materials, if the method of preparing copper sulfide is different from the raw materials used, it will seriously affect the formation of copper sulfide / bismuth vanadate heterojunction, resulting in the loss of photocatalytic activity of copper sulfide, which in turn makes sulfide sulfide The copper / bismuth vanadate heterojunction cannot be formed. The reason for the above problems may be that different preparation methods have different requirements on reaction conditions and raw materials, and different reaction conditions and raw materials are important for the formation of copper sulfide / bismuth vanadate heterojunction. For example, different copper salts, bismuth salts or thiosulfates may change the pH value of the system and other conditions, resulting in the inability to form copper sulfide / bismuth vanadate heterojunction catalysts; (3) The conventional conditions are relatively harsh, and the temperature needs Strict requirements lead to increased costs

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