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Method for Removing Antibiotics from Water Using Copper Sulfide/Bismuth Vanadate Heterojunction Photocatalyst

A photocatalyst, bismuth vanadate technology, applied in physical/chemical process catalysts, chemical instruments and methods, natural water treatment, etc., can solve the problem of fast photogenerated electron-hole recombination rate, harsh conventional conditions, and strict temperature requirements problems, to achieve the effect of good application value and application prospects, strong reusability, and wide application range

Active Publication Date: 2020-03-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for Removing Antibiotics from Water Using Copper Sulfide/Bismuth Vanadate Heterojunction Photocatalyst
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  • Method for Removing Antibiotics from Water Using Copper Sulfide/Bismuth Vanadate Heterojunction Photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A kind of method utilizing copper sulfide / bismuth vanadate heterojunction photocatalyst to remove antibiotic in water body, antibiotic is ciprofloxacin, comprises the following steps:

[0046] Weigh bismuth vanadate (BiVO 4 ), copper sulfide (CuS) and copper sulfide / bismuth vanadate heterojunction photocatalysts (A1, A2, A3, A4), 100 mg each, were added to 100 mL, 10 mg / L ciprofloxacin solution (the The pH value of the solution is 5.6), magnetically stirred for 30 minutes under dark conditions, so that the adsorption-desorption equilibrium between ciprofloxacin and the photocatalyst was reached, and then the photocatalytic reaction was carried out under visible light with a wavelength of 400-760 nm for 90 minutes, The photocatalytic reaction was carried out at a magnetic stirring speed of 550 r / min to complete the removal of ciprofloxacin in water.

[0047] Blank group: take 100 mL, 10 mg / L ciprofloxacin solution without adding any photocatalyst, and treat it under the...

Embodiment 2

[0068] Investigate the degradation effect of copper sulfide / bismuth vanadate heterojunction photocatalyst on ciprofloxacin in the presence of different coexisting ions, including the following steps:

[0069] Weigh 5 parts of the copper sulfide / bismuth vanadate heterojunction photocatalyst (A3) prepared in Example 1, each 100 mg, and add to 100 mL, 10 mg / L ciprofloxacin solution (the pH of the solution is 5.6), add the coexisting ion Na to the 4 Rhodamine B solutions at the same time 3 PO 4 、Na 2 HPO 4 , NaH 2 PO 4 and CaCl 2 , and the other without adding any coexisting ions. Magnetic stirring was performed under dark conditions for 30 min to achieve an adsorption-desorption equilibrium between ciprofloxacin and copper sulfide / bismuth vanadate heterojunction photocatalyst, and then the photocatalytic reaction was carried out under visible light with a wavelength of 400–760 nm for 90 min, wherein the photocatalytic reaction was carried out at a magnetic stirring speed o...

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Abstract

The invention discloses a method for removing antibiotics in water using a copper sulfide / bismuth vanadate heterojunction photocatalyst. The method uses a copper sulfide / bismuth vanadate heterojunction photocatalyst to treat antibiotics in the water, wherein copper sulfide / Bismuth vanadate heterojunction photocatalyst includes copper sulfide and bismuth vanadate, with copper sulfide attached to bismuth vanadate. The method of the invention can be carried out at normal temperature and pressure, can mineralize antibiotics (such as ciprofloxacin) into water and carbon dioxide, and can effectively separate solid and liquid without secondary pollution. It not only has the advantages of simple operation, no need for large equipment, It has the advantages of low cost, wide application range, high treatment efficiency, good treatment effect, strong reusability, environmental friendliness, and can efficiently degrade antibiotics in water bodies, and has good application value and application prospects.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04C02F1/30C02F103/34
CPCC02F1/30B01J27/04C02F2103/343C02F2305/10B01J35/39
Inventor 赖萃张明明李必胜黄丹莲曾光明许飘黄芳龙柳诗语李敏芳何江凡张玉锦
Owner HUNAN UNIV
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