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Enzyme-crosslinked chitosan/polyethyleneimine grafted magnetic gelatin material and its preparation method and application

A polyethyleneimine, polyethyleneimine copolymer technology, applied in the field of environmental science, can solve the problems of incompatibility of adsorption capacity and mechanical stability, and achieve the effect of rapid magnetic separation characteristics, avoiding leakage and high adsorption capacity

Inactive Publication Date: 2018-06-29
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the incompatibility of the adsorption capacity and mechanical stability of conventional adsorbents, the object of the present invention is to provide an enzyme-crosslinked chitosan / polyethyleneimine grafted magnetic gelatin material and its preparation method and application

Method used

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  • Enzyme-crosslinked chitosan/polyethyleneimine grafted magnetic gelatin material and its preparation method and application
  • Enzyme-crosslinked chitosan/polyethyleneimine grafted magnetic gelatin material and its preparation method and application
  • Enzyme-crosslinked chitosan/polyethyleneimine grafted magnetic gelatin material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1 Preparation of Magnetic Gelatin Material and Research on Its Adsorption Properties

[0038] Dissolve 3 g of gelatin in 50 mL of pure water, incubate at room temperature for 30 minutes, heat to dissolve the gelatin, and then add 2.1 g of ferric chloride and ferric sulfate with a mass ratio of 2 / 1 (1.4 g of ferric chloride, 0.7 g of ferric sulfate g). After the temperature of the solution was raised to 80°C, 5 mL of ammonia water (28-30%) was added dropwise, and mechanically stirred at this temperature for 5 hours. Subsequently, the obtained precipitate was washed three times with water, redispersed into 10 mL of water, added 0-30 mg of cross-linking agent (transglutaminase, glutaraldehyde or genipin), stirred at 4 ° C for 12 hours, and finally The precipitates were washed with ethanol and water respectively to obtain different cross-linked magnetic gelatin materials. Among them, the electron micrograph of the enzyme-crosslinked magnetic gelatin prepared by us...

Embodiment 2

[0041] Example 2 Preparation of enzyme-crosslinked chitosan / polyethyleneimine grafted magnetic gelatin material

[0042] (1) Preparation of enzyme-crosslinked magnetic gelatin

[0043] Dissolve 3 g of gelatin in 50 mL of pure water, incubate at room temperature for 30 minutes, heat to dissolve the gelatin, and then add 2.1 g of ferric chloride and ferric sulfate at a mass ratio of 2 / 1. After the temperature of the solution was raised to 80°C, 5 mL of ammonia water (28-30%) was added dropwise, and mechanically stirred at this temperature for 5 hours. Subsequently, the obtained precipitate was washed with water three times, redispersed into 10 mL of water, added 25 mg of transglutaminase, stirred at 4°C for 12 hours, and finally washed with ethanol and water respectively to obtain an enzyme cross-linked magnetic Gelatin material.

[0044] (2) Preparation of chitosan / polyethyleneimine copolymer

[0045] Dissolve chitosan in 10mL acetic acid solution (0.1mmol / L) to make the conce...

Embodiment 3

[0049] Example 3 Research on the performance of enzyme cross-linked chitosan / polyethyleneimine grafted magnetic gelatin material

[0050] (1) Research on adsorption performance

[0051] Determination of the enzyme-crosslinked magnetic gelatin prepared in Example 2 or the enzyme-crosslinked chitosan / polyethyleneimine grafted magnetic gelatin to heavy metal ions (divalent cadmium Cd (II), divalent lead Pb (II)) The method is as follows: add 20mg of different magnetic gelatins to 20mL aqueous solutions containing heavy metal ions at different concentrations (concentration range: 0-100mg / L), and vibrate and adsorb at 25°C for 12 hours at a rate of 200rpm . After the magnetic gelatin was precipitated by centrifugation, the content of heavy metal ions in the supernatant was determined by atomic absorption spectrometry, and the adsorption capacity of the magnetic gelatin material for heavy metal ions was calculated.

[0052] The result is as Figure 5 As shown, the adsorption capa...

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Abstract

The invention discloses an enzymatic crosslinking chitosan / polyethyleneimine grafted magnetic gelatin material and a preparing method and application thereof, and belongs to the technical field of environment. The preparing method includes the steps that a transglutaminase substrate is used for selectively preparing magnetic gelatin particles, iron ion leakage is effectively prevented by an enzymatic crosslinking gelatin shell, as only gelatin glutamy / lysine crosslinking is carried out, and while mechanical stability is maintained, the magnetic gelatin particles reserve a great number of amino groups to chelate metal ions. The surface of the magnetic gelatin material is modified by a polyethyleneimine / chitosan copolymer, the number of amino groups is increased exponentially, and the enzymatic crosslinking chitosan / polyethyleneimine grafted magnetic gelatin material having adsorption capacity and mechanochemistry stability is obtained. The gelatin material has the advantages of being fast in magnetic separation, large in adsorption capacity, fast in mass transfer, green, nontoxic, low in cost and capable of effectively removing heavy metal ions in water.

Description

technical field [0001] The invention relates to the field of environmental science, in particular to an enzyme-crosslinked chitosan / polyethyleneimine grafted magnetic gelatin material and a preparation method and application thereof. Background technique [0002] In recent years, heavy metal pollution incidents have emerged in an endless stream in my country, mainly due to the random discharge and leakage of heavy metals. The purification and removal of heavy metal ions in drinking water is a major issue related to the health of the population. Heavy metal ions produce toxic effects as long as they are in trace concentrations, and they have persistence and enrichment effects. Relevant literature pointed out that the adsorption capacity of conventional drinking fountains for heavy metal ions is low, and the removal efficiency is only maintained at about 30%. Therefore, the development of efficient removal of heavy metal ions in drinking water technology is very important, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B01J20/28C02F1/28C02F1/62
CPCB01J20/0229B01J20/24B01J20/265B01J20/28009B01J2220/46B01J2220/4806B01J2220/4812B01J2220/4825C02F1/285C02F1/286C02F1/288C02F2101/20
Inventor 方敏宫智勇乔晓婷吴永宁
Owner WUHAN POLYTECHNIC UNIVERSITY
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