Preparation method of composite film layers and method of using same to remove tetracycline residue in pharmaceutical wastewater

A composite membrane layer, pharmaceutical wastewater technology, applied in the direction of chemical instruments and methods, membrane technology, water pollutants, etc., can solve problems such as impact, and achieve the effect of simple operation

Active Publication Date: 2018-03-16
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have been practically applied to a certain extent, but there are still great limitations in the application process.
Although methods like membrane separation are able to completely separate tetracycline molecules, this method is susceptible to operating conditions such as operating pressure, electrolyte concentration, etc.
Since a single treatment technology cannot completely remove tetracycline in wastewater at a lower operating cost, it is necessary to integrate multiple treatment technologies to develop a new treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: A method for preparing a ZIF-8 / GO composite film layer. The method is to disperse GO sufficiently by ultrasonic waves to obtain a GO aqueous solution with a concentration of 5 g / L. Then, the GO aqueous solution was further diluted to 1 g / L with methanol, followed by sonication for 7 h, and finally a solution with a certain water-alcohol volume ratio of GO concentration of 1 g / L was obtained. Weigh 2.2kg Zn(NO 3 ) 2 ·6H 2O was dissolved in 72L of methanol, 4.9kg of 2-methylimidazole was dissolved in 120L of methanol, the two solutions were quickly mixed, and 48L of GO solution with a concentration of 1g / L was quickly added to the above mixture, and stirred for 6h . The product was collected by centrifugation at 10000 rpm for 10 min, and the product was washed 5 times with methanol at the same rotational speed and centrifugation time. The product was dried at 80 °C for 24 h to obtain a ZIF-8 / GO composite material powder with a particle size of 200 nm. A ny...

Embodiment 2

[0023] Example 2: A method for preparing a ZIF-8 / GO composite film layer. The method is to disperse GO sufficiently by ultrasonic waves to obtain a GO aqueous solution with a concentration of 7 g / L. Then, the GO aqueous solution was further diluted to 1.5 g / L with methanol, followed by sonication for 6 h, and finally a solution with a water-alcohol volume ratio of GO concentration of 1.5 g / L was obtained. Weigh 3.4kg Zn(NO 3 ) 2 ·6H 2 O was dissolved in 80L of methanol, 6.2kg of 2-methylimidazole was dissolved in 130L of methanol, the two solutions were quickly mixed, and 55L of GO solution with a concentration of 1.5g / L was quickly added to the above mixture, and stirred 7h. The product was collected by centrifugation at 9000 rpm for 15 min, and then the product was washed 6 times with methanol at the same rotational speed and centrifugation time. The product was dried at 80 °C for 24 h to obtain a ZIF-8 / GO composite material powder with a particle size of 200 nm. A nylo...

Embodiment 3

[0024] Example 3: A method for preparing a ZIF-8 / GO composite film layer. The method is to disperse GO sufficiently by ultrasonic waves to obtain a GO aqueous solution with a concentration of 8 g / L. Then, the GO aqueous solution was further diluted to 2 g / L with methanol, followed by sonication for 7 h, and finally a solution with a certain water-alcohol volume ratio of GO concentration of 2 g / L was obtained. Weigh 4.4kg Zn(NO 3 ) 2 ·6H 2 O was dissolved in 90L of methanol, 7.3kg of 2-methylimidazole was dissolved in 140L of methanol, the two solutions were quickly mixed, and 55L of GO solution with a concentration of 2g / L was quickly added to the above mixture, and stirred for 7h . The product was collected by centrifugation at 8000 rpm for 20 min, and then the product was washed 7 times with methanol at the same rotational speed and centrifugation time. The product was dried at 80 °C for 24 h to obtain a ZIF-8 / GO composite material powder with a particle size of 200 nm. ...

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Abstract

The invention relates to a preparation method of composite film layers and a method of using the same to remove tetracycline residue in pharmaceutical wastewater. The method is characterized by comprising: making GO (graphene) into GO solution, dissolving zinc nitrate and 2-methylimidazole respectively in methanol, mixing, adding the GO solution quickly into the mixed solution, stirring well, centrifuging, washing, drying to obtain ZIF-8 (zeolitic imidazolate framework)/GO composite powder, ultrasonically treating the composite powder to obtain a suspension, and binding the dispersed ZIF-8/GOsuspension and polyetherimide-modified microporous filter film by means of vacuum suction filtering to form ZIF-8/GO composite film layers different in thickness; using a vacuum suction filter to passpharmaceutical wastewater through the above composite film layers, and performing suction filtering repeatedly; tetracycline in the tetracycline is removed to 88.9-95.5%; the preparation method of the composite film layers and the method of using the same have the advantages that operations are simple, the cost of raw materials is low, recycling is facilitated, and the materials are reusable.

Description

technical field [0001] The invention relates to a preparation method of a composite film layer, in particular to a preparation method of a composite film layer and a method for removing residual tetracycline in pharmaceutical wastewater by using the method. Background technique [0002] Antibiotics have an irreplaceable position among many drugs, which can inhibit and kill pathogenic bacteria without significantly affecting human cells or tissues. Among many antibiotics, tetracycline antibiotics are a very important class, which are widely used as animal feed additives and treatment of animal diseases. Worldwide, tens of thousands of tons of tetracycline antibiotics are produced and consumed every year, especially in China. [0003] Tetracycline is the most widely used of the tetracycline antibiotic family. It is often used in animal husbandry. After entering the animal body, only a small part is metabolized, and the vast majority of tetracycline is excreted into the envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00C02F1/28C02F1/44C02F101/16
CPCB01D67/0039B01D69/12B01D71/021C02F1/281C02F1/44C02F2101/16
Inventor 马玉龙宋智李聪儿徐嫚张聪
Owner NINGXIA UNIVERSITY
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