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Research on pure two-dimensional covalent organic framework material membrane for removing liquid-phase antibiotics

A technology for antibiotics and removal, applied in the direction of membrane, membrane technology, semi-permeable membrane separation, etc., can solve the problem that trace organic pollutants cannot be fully eliminated, and achieve fewer steps, high repeatability, and good chemical stability Effect

Pending Publication Date: 2020-02-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional wastewater treatment plants (WWTPs) cannot adequately remove trace organic pollutants

Method used

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  • Research on pure two-dimensional covalent organic framework material membrane for removing liquid-phase antibiotics
  • Research on pure two-dimensional covalent organic framework material membrane for removing liquid-phase antibiotics
  • Research on pure two-dimensional covalent organic framework material membrane for removing liquid-phase antibiotics

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Experimental program
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Effect test

Embodiment 1

[0031] COF-TpPa-SO synthesized by interfacial polymerization 3 The H nanosheets were washed and collected. Make it evenly disperse into the solution, take a drop of the dispersion and evenly drop it on the silicon wafer, and dry it at 40 °C for 24 h under vacuum.

[0032] Tp and Pa-SO 3The two monomers of H were ultrasonically dissolved into dichloromethane and water solvent respectively, and then adding a regulator (p-toluenesulfonic acid monohydrate) into the water solvent, which will contain Pa-SO 3 The aqueous solution of H was slowly added dropwise to the solution of Tp in dichloromethane. After 3 days of static reaction, the upper aqueous solution was taken, and after dialysis and washing, COF-TpPa-SO 3 H nanosheet aqueous solution, and then disperse it in deionized water to obtain a certain concentration of COF nanosheet solution. Take a drop of COF aqueous solution and drop it on a clean silicon wafer to test the SEM characterization of the nanosheets.

example 2

[0034] The prepared COF membrane was placed in the separation layer, sealed with an O-ring, and then the prepared feed solution was placed on the feed side, and the antibiotic removal performance and water flux of the membrane were tested by a self-made device.

[0035] COF-TpPa-SO 3 The H film was placed in the mold, sealed with an O-ring, and then the configured 400 ppm concentration of cefotaxime solution was placed on the feed side, and the solution was collected on the discharge side. After turning on the vacuum pump, start to record the suction filtration time and the pressure difference between the feed side and the discharge side. After infiltration, record the volume of solution on the infiltration side. Measure the concentration of the solution on the feed side and the discharge side by a UV spectrophotometer, then calculate the removal rate of antibiotics, and then calculate the flux of water based on the solution volume on the discharge side, suction filtration ti...

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Abstract

The invention discloses a COF-TpPa-SO3H membrane with efficient nanofiltration separation effect on the antibiotic cefalexin, belonging to the field of novel membrane materials. A preparation method for the membrane comprises the following steps: firstly, acquiring a great number of COF nanosheets with a high area-thickness ratio by using the hydrophilicity of sulfonate radicals in a molecular structure through a simple interfacial polymerization method, and then carrying out vacuum filtration in a layer-by-layer stacking manner to obtain the COF-TpPa-SO3H membrane with high mechanical strength and high chemical stability. The removal rate of the pure COF-TpPa-SO3H membrane prepared by vacuum filtration at normal temperature on the antibiotic cefalexin is as high as 95%, with an error range being + / - 0.6%; and a water flux is up to 800 L.m<-2>.H<-1>.MPa<-1>, and the highest water flux of the obtained pure COF membrane is 2500 L.m<-2>.H<-1>.MPa<-1> by changing the deposition mass of COF. The water flux of the COF membrane prepared by the method is higher than the water flux of a currently researched GO nanofiltration membrane and other ultrathin two-dimensional material membranes, and the COF membrane has good application potential in antibiotic removal.

Description

technical field [0001] The invention belongs to the technical field of new material membranes, and provides a pure COF-TpPa-SO through layer-by-layer stacking of nanosheets and applied to liquid-phase antibiotic removal nanofiltration 3 H film preparation method. Background technique [0002] With the improvement of people's quality of life, the global consumption and production of health care drugs are increasing, and the scientific research on health care drugs has shown an increasing trend year by year in recent years. At the same time, pharmaceuticals released into water from sources such as domestic sewage and factory discharges can also affect the entire ecosystem and human health. Drugs are potentially bioactive chemical substances specially designed, produced and used to affect the activity of human cells, thereby improving human bodily functions. However, if their release into the environment is not controlled, they can have unforeseen adverse effects on ecologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/72B01D69/02B01D67/00B01D61/00C02F1/44C02F101/34C02F101/38
CPCB01D71/72B01D69/02B01D67/0006B01D61/027C02F1/442C02F2101/34C02F2101/38C02F2101/40B01D2325/30B01D2325/24
Inventor 刘大欢刘鹏
Owner BEIJING UNIV OF CHEM TECH
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