Preparation method and application of GO/PVDF (Graphene Oxide/Polyvinylidene Fluoride) molecularly imprinted composite membrane

A technology of molecular imprinting and composite membrane, which is applied in the preparation of test samples, chemical instruments and methods, membrane technology, etc., can solve the problem of inability to simultaneously realize the effective separation of molecular and ionic impurities, single and selective separation of certain substances and other problems, to achieve the effect of fast adsorption kinetics, high selectivity, and many times of repeated use

Inactive Publication Date: 2018-01-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects in the prior art, such as: the traditional membrane separation cannot perform a single, high-efficiency selective separation of a certain substance, nor can it simultaneously realize the effective separation of molecular and ionic impurities. The present invention Provide a GO / PVDF molecularly imprinted composite membrane for selectively separating norfloxacin, the GO / PVDF molecularly imprinted composite membrane is used for separating norfloxacin, and the adsorption capacity of norfloxacin can reach 43.76 mg / g

Method used

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  • Preparation method and application of GO/PVDF (Graphene Oxide/Polyvinylidene Fluoride) molecularly imprinted composite membrane
  • Preparation method and application of GO/PVDF (Graphene Oxide/Polyvinylidene Fluoride) molecularly imprinted composite membrane
  • Preparation method and application of GO/PVDF (Graphene Oxide/Polyvinylidene Fluoride) molecularly imprinted composite membrane

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Embodiment 1

[0042] (1) Preparation of graphene oxide

[0043] Graphene oxide was synthesized based on a modified Hummer method. 1 g graphite and 2.5 g NaNO 3 Disperse in 30 mLH 2 SO 4 The three-necked flask was placed in an ice-water bath, and after stirring constantly, 3 g of KMnO 4 Gradually add a small amount of concentrated sulfuric acid to the mixed nitric acid and react for 2 h. The resulting mixture was heated to 35 °C and 40 mL of deionized water was added slowly over 15 min, maintaining the temperature at 98 °C for 40 min. To remove excess KMnO 4 and MnO 2 , add 10 mL of hydrogen peroxide. The obtained mixed solution was repeatedly washed with deionized water until the pH value of the solution reached about 7.0. After the synthesized product was centrifuged, it was repeatedly washed with deionized water and ethanol several times, and dried in vacuum for use.

[0044] (2) Preparation of GO / PVDF blend membrane

[0045] 50 mg graphene oxide was dispersed in DMF, and after u...

Embodiment 2

[0061] (1) Preparation of graphene oxide

[0062] Graphene oxide was synthesized based on a modified Hummer method. 2 g graphite and 2.5 g NaNO 3 Disperse in 30 mLH 2 SO 4 The three-necked flask was kept stirring in an ice-water bath, and then 3 g KMnO 4 Gradually add a small amount of concentrated sulfuric acid to the mixed nitric acid and react for 2 h. The resulting mixture was heated to 35 °C and 40 mL of deionized water was added slowly over 15 min, keeping the temperature at 98 °C for 40 min. To remove excess KMnO 4 and MnO 2 , add 10 mL of hydrogen peroxide. The obtained mixed solution was washed repeatedly with deionized water until the pH value of the solution reached about 7.0, the synthesized product was centrifuged, washed several times with deionized water and ethanol, and dried in vacuum for use.

[0063] (2) Preparation of GO / PVDF blend membrane

[0064] 100 mg of graphene oxide was dispersed in DMF, ultrasonically dissolved for 30 min, and 8 g of PVDF ...

Embodiment 3

[0080] (1) Preparation of graphene oxide

[0081] Graphene oxide was synthesized based on a modified Hummer method. 2 g graphite and 2.5 g NaNO 3 Disperse in 30 mLH 2 SO 4 The three-necked flask was kept stirring in an ice-water bath, and then 3 g KMnO 4 Gradually add a small amount of concentrated sulfuric acid to the mixed nitric acid and react for 2 h. The resulting mixture was heated to 35 °C and 40 mL of deionized water was added slowly over 15 min, keeping the temperature at 98 °C for 40 min. To remove excess KMnO 4 and MnO 2 , add 10 mL of hydrogen peroxide. The obtained mixed solution was washed repeatedly with deionized water until the pH value of the solution reached about 7.0, the synthesized product was centrifuged, washed several times with deionized water and ethanol, and dried in vacuum for use.

[0082] (2) Preparation of GO / PVDF blend membrane

[0083] 100 mg of graphene oxide was dispersed in DMF, ultrasonically dissolved for 30 min, and 8 g of PVDF ...

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Abstract

The invention relates to a preparation method and application of a GO/PVDF (Graphene Oxide/Polyvinylidene Fluoride) molecularly imprinted composite membrane for selectively separating norfloxacin, andbelongs to the technical field of new materials. The molecularly imprinted composite membrane is mainly synthesized through four steps of reactions: firstly, synthesizing graphene oxide nano-sheets;secondly, mixing graphene oxide and PVDF powder, and synthesizing a GO/PVDF mixed membrane through a phase inversion method; thirdly, coating the surface of the mixed membrane with TiO2 (Titanium Dioxide) through a hydrolysis reaction; finally, synthesizing a norfloxacin molecularly imprinted composite membrane by taking the norfloxacin, AM (Acrylamide), EGDMA (Ethylene Glycol Dimethacrylate) andAIBN (Azodiisobutyronitrile) as raw materials. The molecularly imprinted composite membrane is used for detecting residual norfloxacin in a water body. The preparation method provided by the inventionhas the characteristics of convenience in operation, easiness in implementation, higher in yield, mild in reaction conditions and the like, and is expected to be used in industrial production; in addition, static adsorption and selective permeability test results show that the molecularly imprinted composite membrane prepared by the invention has good separating performance and selectivity to thenorfloxacin.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method and application of a GO / PVDF molecularly imprinted composite membrane, wherein the application is selective separation of norfloxacin. Background technique [0002] Due to its advantages of high efficiency, energy saving and environmental protection, membrane separation technology (MST) has been widely used in medicine, energy, water treatment and other fields, and has produced huge economic and social benefits. However, traditional membrane separation cannot perform a single, efficient and selective separation of a certain substance, nor can it simultaneously achieve effective separation of molecular and ionic impurities. Molecular imprinting technology (MIT) is that when template molecules (imprinted molecules) are in contact with polymer monomers, multiple action sites will be formed, and specific recognition sites will be generated throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/34C02F1/44G01N1/34
Inventor 赵娟吴易霖李春香闫永胜
Owner JIANGSU UNIV
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