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Molecular imprinting catalytic membrane capable of selectively degrading ciprofloxacin and preparation method

A molecularly imprinted and ciprofloxacin technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems affecting molecularly imprinted polymers and achieve highly selective degradation effects

Active Publication Date: 2017-07-18
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has made great progress in the selective catalytic degradation of pollutants, there are still limitations. Photocatalysts are usually in powder form, and their morphology and structure will change during the subsequent crushing and grinding process. Affects the performance of molecularly imprinted polymers. Compared with traditional particle-type molecularly imprinted polymers, molecularly imprinted membranes (Molecular ImprintingMembrane, MIM) are prepared by coupling molecular imprinting technology and membrane separation technology with high selectivity and high sensitivity. The new technology of the membrane, the material has a long service life, is easy to recycle, can be recycled, is easy to integrate with other instruments, and can also achieve decontamination of the target object

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: (1) Ag / Au / C 3 N 4 Catalyst preparation

[0035] 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 Add the aqueous solution dropwise to the above solution, and finally take 1g of graphite-like carbonized nitrogen (g-C 3 N 4 ) was dissolved in the above solution, stirred by magnetic force for 1 h, then washed three times with deionized water and absolute ethanol, and dried at 120 °C for 24 h after centrifugation to finally obtain the Ag / Au / C3N4 catalyst. As a comparison, the same Methods and steps for the synthesis of Ag / C 3 N 4 Catalyst, but do not add chloroauric acid solution; synthesize Au / C with the same method an...

Embodiment 2

[0040] Embodiment 2: (1) by changing the kind of photocatalyst (Ag / Au / C 3 N 4 , Ag / C 3 N 4 and Au / C 3 N 4 ) to examine the effect of different catalysts on photocatalytic degradation, the results show that Ag / Au / C 3 N 4 The degradation efficiency of the catalyst to ciprofloxacin is the highest, which can reach more than 90%. So the catalyst chosen in the experiment is Ag / Au / C 3 N 4 catalyst.

[0041] (2) By changing Ag / Au / C 3 N 4 The amount of photocatalyst (0.2g, 0.3g, 0.4g) is used to examine the influence of catalyst dosage on photocatalytic degradation. The results show that when the catalyst dosage is 0.3g, the volume of ciprofloxacin solution is 70mL, and the concentration is 20mg L -1 When , it has the highest degradation efficiency to ciprofloxacin, which can reach more than 92%. Therefore, the amount of catalyst selected in the experiment was 0.3 g.

[0042] (3) Molecularly imprinted catalytic membrane prepared with 0.3g photocatalyst degrades different c...

Embodiment 3

[0043] Embodiment 3: Use the photocatalytic membrane prepared in (2) in Example 1 to degrade the mixed solution of ciprofloxacin and interfering substance (gatifloxacin) of the same concentration respectively, and then calculate its degradation efficiency by calculating the degradation efficiency of different substances Selectivity coefficients for different substances.

[0044]

[0045] where C 0 , C e are the initial and degraded concentrations of ciprofloxacin (mg L -1 ); D is the distribution coefficient, D CIP ,D M are the partition coefficients of ciprofloxacin and interfering substances, respectively; α is the selectivity coefficient, α i , α n are the selectivity coefficients of ciprofloxacin and gatifloxacin, respectively, α r is the relative selectivity coefficient. The experimental results showed that the degradation efficiency of ciprofloxacin by the molecularly imprinted photocatalytic membrane was significantly higher than that of other contrasting subs...

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Abstract

The invention provides a molecular imprinting catalytic membrane capable of selectively degrading ciprofloxacin and a preparation method. The preparation method comprises the following steps: step 1, preparing graphite-like nitrogen carbonate g-C3N4; step 2, preparing a noble metal loaded semiconductor composite material; and step 3, preparing the molecular imprinting catalytic membrane capable of selectively degrading the ciprofloxacin. The material prepared by the preparation method can effectively realize the aims of preferably selectively adsorbing and degrading target pollutants in a mixed sewage system; post-treatment is simple, a photocatalyst is conveniently recycled for a plurality of times and secondary pollution is effectively avoided; and the molecular imprinting catalytic membrane has the advantage of selectively treating antibiotic wastewater very well.

Description

technical field [0001] The invention relates to a method for preparing a photocatalytic molecularly imprinted catalytic film of a precious metal loaded semiconductor by using a water drop template method. The method has simple technology and good photocatalytic activity, and belongs to the technical field of material preparation and environmental pollution control. Background technique [0002] Ciprofloxacin hydrochloride (CIP) is a broad-spectrum antibiotic of the third-generation fluoroquinolone antibacterial drug. It has the characteristics of high efficiency, low toxicity, good oral effect, and high antibacterial activity against Gram-negative bacteria and Staphylococcus. , so it is widely used as human medicine and veterinary medicine, and is also used in aquaculture and other fields. However, its drug resistance and its side effects also seriously affect people's lives. Studies have shown that ciprofloxacin has serious liver and kidney toxicity, which directly threaten...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/32C02F101/38C02F101/34
CPCB01J27/24B01J35/004B01J35/065C02F1/32C02F2101/34C02F2101/38C02F2305/10
Inventor 孟敏佳崔颜华冯永海戴晓晖刘燕李春香
Owner JIANGSU UNIV
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