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Temperature-pH responsive molecularly-imprinted fiber membrane and preparation method thereof

A molecular imprinting and temperature-responsive technology, applied in fiber treatment, chemical instruments and methods, and other chemical processes, can solve the complex process of elution of template polymers, increase the cost of waste liquid treatment, and environmental friendliness, etc., to achieve rapid Short time for separation and polymerization, good stability

Pending Publication Date: 2021-11-16
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of eluting the template polymer is also complicated and takes longer, and all elution with organic solvents increases the cost of waste liquid treatment, and is contrary to environmental friendliness

Method used

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  • Temperature-pH responsive molecularly-imprinted fiber membrane and preparation method thereof
  • Temperature-pH responsive molecularly-imprinted fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 1.01 g chitosan fiber membrane, 1.14 g isopropylacrylamide, 0.26 g tert-butylacrylamide, 0.61 g methacrylic acid, 0.02 g cuprous bromide and 0.02 g pentamethyldiethylenetriamine in 20.0 In mL deionized water, containing 0.2 g of the template dye gentian violet, nitrogen gas was bubbled for 60 min to remove oxygen in the environment. After reacting at 40.0 °C for 90 min, the fiber membrane was rinsed with ethanol for 3-6 times, and dried in vacuum for later use.

[0029]The 13 mg fiber membrane was immersed in 43 mL gentian violet solution with an initial concentration of 20 mg / L, the pH was 7.0, and the adsorption capacity was measured to be 212.0 mg / g after adsorption equilibrium for 7 minutes. The fiber membrane adsorbed with gentian violet was transferred to a (20 mL, 36.5 g / L) hydrochloric acid aqueous solution at a pH of 3.0 and a temperature of 25 °C. Then the temperature was rapidly raised to 60°C, maintained for 30 min, and then rapidly lowered to 25°C...

Embodiment 2

[0031] Dissolve 1.01 g chitosan fiber membrane, 1.14 g isopropylacrylamide, 0.26 g tert-butylacrylamide, 0.61 g methacrylic acid, 0.02 g cuprous bromide and 0.02 g pentamethyldiethylenetriamine in 20.0 In mL deionized water, containing 0.2 g of the template dye gentian violet, nitrogen gas was bubbled for 60 min to remove oxygen in the environment. After reacting at 40.0 °C for 90 min, the fiber membrane was rinsed with ethanol for 3-6 times, and dried in vacuum for later use.

[0032] The 13 mg fiber membrane was immersed in 43 mL gentian violet solution with an initial concentration of 20 mg / L, the pH was 7.0, and the adsorption capacity was measured to be 196.0 mg / g after adsorption equilibrium for 7 minutes. The fiber membrane adsorbed with gentian violet was transferred to a (20 mL, 36.5 g / L) aqueous hydrochloric acid solution at a pH of 3.0 and a temperature of 25 °C. Then the temperature was rapidly raised to 60°C, maintained for 30 min, and then rapidly lowered to 25°...

Embodiment 3

[0034] Dissolve 1.01 g chitosan fiber membrane, 1.14 g isopropylacrylamide, 0.26 g tert-butylacrylamide, 0.61 g methacrylic acid, 0.02 g cuprous bromide and 0.02 g pentamethyldiethylenetriamine in 20.0 In mL deionized water, containing 0.2 g of the template dye gentian violet, nitrogen gas was bubbled for 60 min to remove oxygen in the environment. After reacting at 40.0 °C for 90 min, the fiber membrane was rinsed with ethanol for 3-6 times, and dried in vacuum for later use. Electron microscope test results show that the fibers are uniform and have high porosity.

[0035] The 13 mg fiber membrane was immersed in 43 mL gentian violet solution with an initial concentration of 20 mg / L, the pH was 7.0, and the adsorption capacity was measured to be 177.0 mg / g after adsorption equilibrium for 7 minutes. The fiber membrane adsorbed with gentian violet was transferred to a (20 mL, 36.5 g / L) aqueous hydrochloric acid solution at a pH of 3.0 and a temperature of 25 °C. Then the tem...

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Abstract

The invention provides a temperature-pH responsive molecularly-imprinted fiber membrane and a preparation method thereof, belonging to the field of polymer functional materials. The preparation method of the temperature-pH responsive molecularly-imprinted fiber membrane comprises the following steps: preparing a nanofiber membrane from chitosan by using an electrostatic spinning technology, and then grafting a temperature responsive polymer poly(N-isopropylacrylamide-co-N-tert-butylacrylamide)-co-methacrylic acid on the surface of the nanofiber membrane through a free radical polymerization reaction. A prepared material has specific recognition capacity on dyes or heavy metal ions, the maximum adsorption capacity of the material on gentian violet dyes reaches 212.0 mg / g, adsorption equilibrium time is 7 min, and an desorption rate reaches 97%. The morphology of the fiber membrane is kept in a solution with a pH value of 6.0-14.0; the fiber membrane is dissolved in a solution with a pH value of 1.0-6.0; the molecular chain of a polymer brush is hydrophilic and is stretched when the temperature is lower than 32.5 DEG C; and the molecular chain is curled up and separated out from water when the temperature is higher than 32.5 DEG C. After adsorption is finished, pollutants can be easily and rapidly separated out due to temperature and pH responsiveness, so effective removal and enrichment of the pollutants are realized. The fiber membrane has a good application prospect in the aspects of environmental protection and water quality detection and analysis.

Description

technical field [0001] The invention belongs to the field of polymer functional materials, and in particular relates to a preparation method of a temperature-pH responsive molecularly imprinted fiber membrane. Background technique [0002] With the rapid development of society and the continuous improvement of people's living standards, the quality of the environment and the health of drinking water have increasingly attracted people's attention. Heavy metals and organic substances in industrial wastewater are refractory and highly toxic, and can accumulate in living organisms, causing harm to the human body along with the cycle of the food chain. The current common water treatment methods include precipitation method, ion exchange method, biological treatment method, membrane separation method, etc. Adsorption method is widely used because of its low cost, simple equipment, easy operation and environmental friendliness. [0003] Chitosan is a natural alkaline polymer polys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28D06M14/06C02F101/20C02F101/30
CPCB01J20/261B01J20/24B01J20/28038C02F1/288D06M14/06C02F2101/20C02F2101/308
Inventor 于在乾庞祎张龙田君
Owner CHANGCHUN UNIV OF TECH
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