Method for removing antibiotics from water body by using copper sulfide/bismuth vanadate heterojunction photocatalyst

Abstract

The invention discloses a method for removing antibiotics from a water body by using a copper sulfide / bismuth vanadate heterojunction photocatalyst. The method treats the antibiotics in the water bodyby using the copper sulfide / bismuth vanadate heterojunction photocatalyst, wherein the copper sulfide / bismuth vanadate heterojunction photocatalyst comprises copper sulfide and bismuth vanadate, andthe copper sulfide is attached to the bismuth vanadate. The method can be carried out at normal temperature under normal pressure, can mineralize the antibiotics (such as ciprofloxacin) into water andcarbon dioxide, can effectively perform solid-liquid separation without secondary pollution, has the advantages of simple operation, no need for large equipment, low cost, wide application range, high treatment efficiency, good treatment effect, strong reusability and environmental friendliness, can efficiently degrade the antibiotics in the water body, and has good application value and application prospect.

Description

technical field [0001] The invention belongs to the field of advanced oxidation treatment of environmental pollutants, and relates to a method for removing antibiotics in water, in particular to a method for removing antibiotics in water by using a copper sulfide / bismuth vanadate heterojunction photocatalytic material. 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 its production process, due to improper management of the wastewater containing antibiotics discharged by the factory, the wastewater was discharged into rivers and lakes, and then passed through pollutants in the water. Accumulate in the environment and cause harm to aquatic organisms. For example, ciprofloxacin is a typical antibiotic-type re...

AI Technical Summary

Problems solved by technology

Photocatalytic technology has the advantages of being carried out under normal temperature and pressure, high degradation efficiency, strong oxidation, and no secondary pollution, and the core of photocatalytic technology is photocatalyst. However, existing photocatalysts have narrow visible light response range and photogenerated electrons. -Shortcomings such as fast hole recombination rate and insufficient photocatalytic activity, such as the composite material of cadmium sulfide and bismuth vanadate has problems such as narrow visible light absorption range, high carrier recombination efficiency, and insufficient photocatalytic activity; such as copper sulfide / vanadate There are still the following problems in the preparation process of bismuth heterojunction: in the preparation process of composite materials, too much or too little bismuth vanadate will have a serious impact on the photocatalytic performance of composite materials; in the preparation process of composite materials, if the preparation The method of copper sulfide is different from the raw materials used, which will seriously affect the formation of copper sulfide / bismuth vanadate heterojunction, resulting in the loss of photocatalytic activity of copper sulfide, and then making it impossible to form copper sulfide / bismuth vanadate heterojunction, resulting in the above The reason for the problem may be that different preparation methods have different requirements on reaction conditions and raw materials, and different reaction conditions and raw materials have an important impact on the formation of copper sulfide / bismuth vanadate heterojunction, such as different copper salts, bismuth salts or sulfide Sulfate may change the pH value of the system and other conditions, resulting in the inability to form a copper sulfide / bismuth vanadate heterojunction catalyst; the conventional conditions are relatively harsh, and the temperature needs to be strictly required, resulting in an increase in cost

The existence of the above problems seriously limits the practical application range of photocatalytic technology.

In addition, the existing photocatalytic technology for removing antibiotics (such as ciprofloxacin) in water still has the following problems: (1) With the extension of the light time, the life of the photocatalyst will continue to weaken, so the removal rate will decrease. (2) When the water contains inorganic salt ions, these inorganic salt ions may have a certain impact on the degradation of ciprofloxacin

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