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Preparation process of amino acid modified ethylene-vinyl alcohol copolymer nanofiber membrane

A vinyl alcohol copolymer, nanofiber membrane technology, applied in the directions of fiber treatment, fiber type, fiber chemical characteristics, etc., can solve the problems of unseen-COOH grafted polymer fiber membrane, etc., and achieves the benefits of recycling and reuse, The effect of reducing steric hindrance and large specific surface area

Pending Publication Date: 2022-06-03
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, using -NH 2 There are many reports on the reaction with polymers, but there are almost no studies on the use of -COOH grafted polymer fiber membranes on amino acids

Method used

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  • Preparation process of amino acid modified ethylene-vinyl alcohol copolymer nanofiber membrane
  • Preparation process of amino acid modified ethylene-vinyl alcohol copolymer nanofiber membrane
  • Preparation process of amino acid modified ethylene-vinyl alcohol copolymer nanofiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

Dissolve 0.74 g EVOH in 10 mL of a mixed solvent of isopropanol and deionized water (7 / 3, v / v), stir at 65°C until EVOH is completely dissolved;

Withdraw 3 mL of the spinning solution with a syringe with a needle and place it on a microsyringe pump.

[0025] Adjust the spinning voltage to 17 kV and the flow rate to 0.6 mL h -1 , the receiving distance is 15 cm, and after about 8 hours, EVOH NFM with a certain thickness can be obtained.

[0026] The EVOH NFM was immersed in 10 % arginine solution, polyphosphoric acid was added as a catalyst, and the reaction was carried out at 85 °C for 30 min to obtain arginine-modified EVOH (EVOH-ARG) NFM.

[0027] The reaction equation for arginine-modified EVOH is as follows:

The pure EVOH nanofiber membrane has a smooth surface, uniform thickness and good fiber morphology. After the grafting of arginine, the fibers appeared obvious merging phenomenon, and the fibers became flat. As shown in Figure 1.

[0028] Since the adsorbed C...

Embodiment 2

Dissolve 0.74 g EVOH in 10 mL of a mixed solvent of isopropanol and deionized water (7 / 3, v / v), stir at 65°C until EVOH is completely dissolved;

Withdraw 3 mL of the spinning solution with a syringe with a needle and place it on a microsyringe pump.

[0031] Adjust the spinning voltage to 17 kV and the flow rate to 0.6 mL h -1 , the receiving distance is 15 cm, and after about 8 hours, EVOH NFM with a certain thickness can be obtained.

[0032] The EVOH NFM was immersed in 20 % glutamic acid solution, and polyphosphoric acid was added as a catalyst to react at 95 °C for 120 min to obtain glutamic acid-modified EVOH (EVOH-GLU) NFM.

[0033] The reaction equation for the modification of EVOH with glutamate is as follows:

The reaction temperature has a great influence on the fiber morphology, as shown in Figure 4. The diameter of EVOH NFM fibers modified by GLU was obviously thicker, and the fibers became denser. This phenomenon became more and more obvious with the incr...

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Abstract

The preparation process of the amino acid modified ethylene-vinyl alcohol copolymer nanofiber membrane (EVOH NFM) comprises the following steps: (1) dissolving a certain amount of EVOH in a mixed solvent of isopropanol and deionized water to prepare a homogeneous solution; (2) extracting 3mL of the spinning solution by using an injector with a needle head, placing the spinning solution on a micro-injection pump, and adjusting spinning voltage, flow velocity and receiving distance to obtain EVOH NFM after several hours; and (3) soaking the EVOH NFM in an amino acid solution with a certain concentration, adding polyphosphoric acid as a catalyst, and reacting at a certain temperature for a period of time to obtain the amino acid modified EVOH NFM. The amino acid modified EVOH NFM prepared by the process is strong in mechanical property, good in water stability and high in grafting rate. And Cr (VI) ions in an aqueous solution can be quickly and effectively adsorbed under an acidic condition. More importantly, the adsorbent existing in the form of the nanofiber membrane does not need any complex separation operation during recovery, so that the amino acid modified EVOH NFM is easy to recover and reuse.

Description

technical field [0001] The invention relates to a preparation process of an amino acid-modified ethylene-vinyl alcohol copolymer (EVOH) nanofiber membrane based on electrospinning technology, in particular to a preparation process of an adsorption membrane applied to the removal of heavy metal ions in an aqueous solution. Background technique [0002] Cr(VI) has high toxicity and carcinogenicity, therefore, the removal of Cr(VI) in aqueous solution has attracted increasing attention. Among the existing removal methods, the adsorption method is one of the most competitive methods because of its simple operation, low cost, rapidity and effectiveness. Electrospinning is a representative technique for the preparation of functional nanofibrous membranes (NFMs), which is mild and simple. The as-prepared NFMs have large specific surface area, high porosity, outstanding mechanical strength and good permeability, and the fibrous membrane can also have certain functionality through s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/342D06M13/328D06M13/432D01F6/30D04H1/728D01D5/00B01J20/26B01J20/28B01J20/30C02F1/28C02F101/22D06M101/20
CPCD06M13/342D06M13/328D06M13/432D01F6/30D04H1/728D01D5/0015B01J20/264B01J20/28033C02F1/285C02F2101/22D06M2101/20Y02A20/131
Inventor 张志明李婷婷
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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