Composite separation membrane with electric field sensitivity during Congo red filtration

A separation membrane, Congo red technology, applied in the field of polymer separation membrane surface modification, can solve problems such as a lot of energy consumption, time cost, material stability damage, pH range limitation, etc., to achieve easy industrial application, large dynamic changes Scope, easy operation

Active Publication Date: 2021-08-06
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a large amount of chemical reagents are required to adjust the change of pH conditions, and the material cost and time cost are high
And the pH range is limited, which will damage the stability of the material
Changes in temperature conditions require a lot of energy consumption and time costs, and the temperature adjustment range is limited
However, there are no published reports of membranes that are sensitive to electric fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 300 ml of deionized water to a clean beaker, then add 0.6 g of dopamine, ultrasonicate and stir for 30 minutes, then put a clean polyethersulfone (PES) membrane into the beaker; then put it into a shaking incubator Shake at a constant temperature of 30°C for 24 hours to obtain a dopamine-coated PES membrane. The function of dopamine is to adsorb enough silver ions in the next experiment. Add 0.1597 g of silver nitrate into a beaker containing 100 ml of deionized water, and stir ultrasonically for 10 minutes to obtain a silver ion solution. The PES membrane coated with dopamine in the previous step was immersed in the silver nitrate solution for 5 minutes to ensure that enough silver ions were adsorbed. The membrane was then removed, and the surface of the membrane was rinsed with deionized water to remove excess silver ions. Add 25g of cobalt sulfate, 50g of sodium pyrophosphate, 45ml of 28% concentrated ammonia water and 1.5g of dimethylaminoborane in sequence in ...

Embodiment 2

[0027] Add 300 ml of deionized water to a clean beaker, then add 0.9 g of dopamine, ultrasonicate and stir for 30 minutes, then put a clean polyethersulfone (PES) membrane into the beaker; then put it into a shaking incubator Shake at a constant temperature of 32°C for 24 hours to obtain a dopamine-coated PES membrane. The function of dopamine is to adsorb enough silver ions in the next experiment. Add 0.1886 g of silver nitrate into a beaker containing 100 ml of deionized water, and stir ultrasonically for 15 minutes to obtain a silver ion solution. The PES membrane coated with dopamine in the previous step was immersed in the silver nitrate solution for 5 minutes to ensure that enough silver ions were adsorbed. The membrane was then removed, and the surface of the membrane was rinsed with deionized water to remove excess silver ions. Add 27g of cobalt sulfate, 48g of sodium pyrophosphate, 43ml of 28% concentrated ammonia and 1.8g of dimethylaminoborane in sequence in a beak...

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Abstract

The invention relates to a composite separation membrane with electric field sensitivity during Congo red filtration. Thecomposite separation membrane is prepared by the following steps: immersing a polyethersulfone membrane into a dopamine solution, controlling the temperature and oscillating to obtain a dopamine-coated polyethersulfone membrane; immersing the polyethersulfone membrane coated with dopamine into a silver ion solution to obtain a polyethersulfone membrane adsorbing silver ions; and immersing the polyether sulfone membrane adsorbing the silver ions into a cobalt reducing solution to prepare the PES-Co composite separation membrane. The composite separation membrane has electric field sensitivity to the retention rate of Congo red, the retention efficiency is enhanced along with the enhancement of the electric field intensity, and the composite separation membrane has a large dynamic change range within the range of 0-20V, is suitable for selective separation, has the advantages of simplicity in operation, low cost and easiness in realization of industrial application, and has important significance in the aspect of printing and dyeing wastewater treatment.

Description

technical field [0001] The invention relates to the technical field of surface modification of polymer separation membranes, in particular to a PES-Co composite separation membrane with electric field sensitivity when filtering Congo red. Background technique [0002] Water scarcity and water pollution have attracted more and more global attention. As a new interdisciplinary practical technology, membrane technology has gradually emerged in the utilization of sewage resources in recent years. The use of membrane separation technology can remove suspended solids, bacteria, toxic metal substances and organic substances in water and improve water quality. Compared with traditional separation technologies, membrane technology has the advantages of high efficiency, energy saving, environmental friendliness, easy process control, convenient operation, and easy integration with other technologies. Therefore, membrane water treatment technology is known as "the water treatment tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/06B01D71/02B01D69/12B01D67/00C02F1/44C02F101/30
CPCB01D71/68B01D71/06B01D71/022B01D69/12B01D67/0079C02F1/44B01D2325/26C02F2101/308Y02W10/10
Inventor 林红军申利国
Owner ZHEJIANG NORMAL UNIVERSITY
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