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Preparation method and application of molecular print catalytic membrane for selectively degrading tetracycline

A technology of molecular imprinting and tetracycline, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve cumbersome separation, recovery and reuse, harm to the environment, and small diffusion resistance and other problems, to achieve the effect of strong selective treatment of antibiotic wastewater, simple and convenient post-treatment, and improved efficiency

Inactive Publication Date: 2017-04-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Tetracycline antibiotics have good antibacterial activity against Gram-positive and Gram-negative serious diseases, so they are widely used in the prevention and treatment of human and animal diseases or as poultry feed additives. It is excreted into the water environment due to the incomplete metabolism of antibiotics, and the residual antibiotics can stimulate the selective genetic variation of microorganisms, leading to the emergence of antibiotic-resistant pathogens, which has become a potential risk to the environment and human health. Scholars at home and abroad have studied It has been confirmed that there are tetracycline antibiotic residues in the soil and water environment, which has aroused widespread concern in environmental ecology. Therefore, it is extremely urgent to establish and develop effective and economical treatment methods to selectively remove tetracycline antibiotic residues in the environment.
Although this technology has made great progress in the selective catalytic degradation of pollutants, it still has its limitations. Photocatalysts are usually in powder form, and the subsequent separation, recovery and reuse are cumbersome. Unlike traditional particle-type molecularly imprinted polymers (MIPs), tetracycline molecularly imprinted catalytic membrane (MIM) has unique advantages such as no need for cumbersome preparation process such as grinding, small diffusion resistance, and easy application. The field of sensors and bioactive materials has great application prospects; the application of MIM in the field of separation and catalysis, due to its advantages of continuous operation, easy amplification, low energy consumption, and high energy utilization, can be used in medicine, food, chemical industry and agriculture. Realize "green chemistry" production in the process of separation, analysis and degradation in industries such as

Method used

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  • Preparation method and application of molecular print catalytic membrane for selectively degrading tetracycline
  • Preparation method and application of molecular print catalytic membrane for selectively degrading tetracycline
  • Preparation method and application of molecular print catalytic membrane for selectively degrading tetracycline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Ag@Au@TiO 2 Catalyst preparation

[0039] First, 1 g of polyvinyl alcohol (PVA) was dissolved in 99 mL of deionized water, and 1 g of chloroauric acid (HAuCl 4 4H 2 O) dissolved in 10mL deionized water, take 0.157g silver nitrate (AgNO 3 ) was dissolved in 0.418mL chloroauric acid solution, and then the above mixed solution was slowly added dropwise to 4mL of 1% PVA aqueous solution with a mass fraction of 0.1mol L -1 NaBH 4 The aqueous solution was added dropwise to the above solution, and finally 1g of titanium dioxide (TiO 2 ) was dispersed in the above solution, stirred by magnetic force for 1~2h, then washed three times with deionized water and absolute ethanol, and dried at 120°C~180°C for 24h~48h after centrifugation to finally obtain Ag@Au@TiO 2 catalyst;

[0040] (2) Preparation of molecularly imprinted catalytic membrane

[0041] First, take 0.1g Ag@Au@TiO 2 The catalyst was added to 17.04g dimethyl sulfoxide (DMSO), and ultrasonically dispersed fo...

Embodiment 2

[0045] (1) By changing Ag@Au@TiO 2 The amount of photocatalyst (0.2g, 0.3g, 0.4g) was used to examine the effect of catalyst dosage on photocatalytic degradation, and the Ag@Au@TiO 2 While changing the amount of photocatalyst, change the amount of dimethyl sulfoxide to ensure that Ag@Au@TiO 2 The total mass fraction of photocatalyst and dimethyl sulfoxide is 85.7%. The results show that when the amount of catalyst is 0.4g, the degradation efficiency of tetracycline is the highest, which can reach more than 95%. Therefore, the amount of catalyst selected in the experiment was 0.4 g.

[0046] (2) Molecularly imprinted catalytic membranes prepared with 0.4 g of photocatalysts were catalytically degraded under visible light at different concentrations (10, 20, 30, 40, 50 mg·L -1 ) of tetracycline solution, and examine the degradation kinetics of tetracycline by molecularly imprinted photocatalyst membrane at different concentrations. By calculating and fitting the kinetic equati...

Embodiment 3

[0048] Use the photocatalytic film prepared in (2) in Example 1 to degrade the mixed solution of tetracycline and interfering substance (ciprofloxacin) of the same concentration respectively, and then calculate its selectivity coefficient to different substances by calculating the degradation efficiency of different substances .

[0049]

[0050]

[0051]

[0052]

[0053] where C 0 , C e are the initial and degraded concentrations of tetracycline (mg L -1 ); D is the distribution coefficient, D CIP ,D M are the partition coefficients of tetracycline and interfering substances, respectively; α is the selectivity coefficient, α i , α n are the selectivity coefficients of imprinted and blank polymer photocatalysts, α r is the relative selectivity coefficient.

[0054] The experimental results show that the degradation efficiency of tetracycline by the molecularly imprinted photocatalytic membrane is significantly higher than that of other contrasting substance...

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Abstract

The invention provides a preparation method and application of a molecular print catalytic membrane for selectively degrading tetracycline. The preparation method mainly comprises the steps that 1, an Ag@Au@TiO2 catalyst is prepared; 2, dispersion liquid of the Ag@Au@TiO2 catalyst is prepared; 3, a casting solution is further prepared through the dispersion liquid of the Ag@Au@TiO2 catalyst; 4, a blend membrane is prepared on a glass plate through the casting solution; and 5, the molecular print catalytic membrane for selectively degrading the tetracycline is prepared through the blend membrane. Through the photocatalytic degradation process of the prepared molecular print catalytic membrane for selectively degrading the tetracycline, the purposes of selectively recognizing, adsorbing and catalytically degrading target pollutants can be achieved effectively, aftertreatment is simple and convenient, the effective degradation efficiency of the target substances is improved, and the preparation method has the advantage of higher selectivity of treatment of antibiotic wastewater.

Description

technical field [0001] The invention relates to a method for preparing a photocatalytic molecularly imprinted catalytic membrane of a precious metal loaded semiconductor by using phase inversion technology, specifically a preparation method and application of a molecularly imprinted catalytic membrane for selectively degrading tetracycline, which belongs to material preparation and environment The technical field of pollution control. Background technique [0002] Tetracycline antibiotics have good antibacterial activity against gram-positive and gram-negative serious diseases, so they are widely used in the prevention and treatment of human and animal diseases or as poultry feed additives. It is excreted into the water environment due to the incomplete metabolism of antibiotics, and the residual antibiotics can stimulate the selective genetic variation of microorganisms, leading to the emergence of antibiotic-resistant pathogens, which has become a potential risk to the env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J23/52B01J31/38B01J20/26B01J20/28B01J20/30C02F1/28C02F1/30
CPCB01J20/0233B01J20/06C02F1/288C02F1/30B01J20/268B01J20/28033B01J23/50B01J23/52B01J31/38C02F2305/10B01J35/39B01J35/59
Inventor 崔颜华孟敏佳冯永海戴晓晖刘燕李春香
Owner JIANGSU UNIV
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