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Magnetic cross-linked chitosan as well as preparation method and application thereof

A technology for cross-linking chitosan, chitosan, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve poor mechanical and electrical properties, application limitations, human health risks and other problems, to achieve good thermal stability, reduce processing costs, increase service life and cycle utilization.

Inactive Publication Date: 2021-03-30
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Tetracycline residues in the environment may promote the growth of Antibiotic Resistant Bacteria (ARB) and Antibiotic Resistance Genes (ARG), thereby posing risks to human health
Despite the many advantages and unique properties of chitosan, its application in a wider range is still limited due to its poor mechanical and electrical properties

Method used

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  • Magnetic cross-linked chitosan as well as preparation method and application thereof
  • Magnetic cross-linked chitosan as well as preparation method and application thereof
  • Magnetic cross-linked chitosan as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] One, prepare cross-linked chitosan;

[0032] 10g chitosan (degree of deacetylation > 90%) was dissolved in 4% 550ml glutaraldehyde solution, stirred with a magnetic stirrer at a speed of 155r / min for 9 hours at room temperature, then filtered, and the filtrate was discarded; The obtained cross-linked chitosan was washed with ultrapure water for 3 times, and then put into a vacuum drying oven to dry for more than 12 hours to obtain dry cross-linked chitosan (CS).

[0033] 2. Preparation of magnetically cross-linked chitosan

[0034] 2.6g FeCl 3 ·6H 2 O was dissolved in 75ml of ethylene glycol, then 1.0g of powdered chitosan was added, and the mixture was stirred at room temperature for 8 hours, after stirring well, 3.0g of sodium acetate was added, mixed well, and the mixture was transferred to a 100mL polytetrafluoroethylene stainless steel high pressure Kettle, heated in a blast oven at 180°C for 7 hours. Subsequently, the autoclave was naturally cooled to room tem...

Embodiment 2

[0036] One, prepare cross-linked chitosan;

[0037] 10g chitosan (degree of deacetylation > 90%) was dissolved in 6% 450ml glutaraldehyde solution, stirred with a magnetic stirrer at a speed of 165r / min for 7 hours at room temperature, filtered then, and discarded the filtrate; The obtained cross-linked chitosan was washed with ultrapure water for 3 times, and then put into a vacuum drying oven to dry for more than 12 hours to obtain dry cross-linked chitosan (CS).

[0038] 2. Preparation of magnetically cross-linked chitosan

[0039] 2.6g FeCl 3 ·6H 2 O was dissolved in 85ml of ethylene glycol, then 1.0g of powdered chitosan was added, the mixture was stirred at room temperature for 8 hours, after stirring well, 3.4g of sodium acetate was added, mixed well, and the mixture was transferred to a 100mL polytetrafluoroethylene stainless steel high pressure Kettle, heated in a blast oven at 190°C for 5 hours. Subsequently, the autoclave was naturally cooled to room temperature...

Embodiment 3

[0041] One, prepare cross-linked chitosan;

[0042] 10g chitosan (degree of deacetylation > 90%) was dissolved in 5% 500ml glutaraldehyde solution, stirred with a magnetic stirrer at a speed of 160r / min for 8 hours at room temperature, then filtered, and the filtrate was discarded; The obtained cross-linked chitosan was washed with ultrapure water for 3 times, and then put into a vacuum drying oven to dry for more than 12 hours to obtain dry cross-linked chitosan (CS).

[0043] 2. Preparation of magnetically cross-linked chitosan

[0044] 2.6g FeCl 3 ·6H 2 O was dissolved in 80ml of ethylene glycol, then 3.0g of powdered chitosan was added, the mixture was stirred at room temperature for 8 hours, after stirring well, 3.2g of sodium acetate was added, mixed well, and the mixture was transferred to a 100mL polytetrafluoroethylene stainless steel high pressure Kettle, heated in a forced air oven at 185°C for 6 hours. Subsequently, the autoclave was naturally cooled to room te...

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Abstract

The invention provides magnetic cross-linked chitosan as well as a preparation method and application thereof. The preparation method of the magnetic cross-linked chitosan comprises the following steps: A) carrying out cross-linking reaction on chitosan and a cross-linking agent to prepare cross-linked chitosan; and B) uniformly mixing the cross-linked chitosan with ferric salt, ethylene glycol and sodium acetate, then carrying out heating reaction, and then carrying out drying and magnetic separation to obtain the magnetic cross-linked chitosan. The surface of the magnetic cross-linked chitosan is of a porous net-shaped structure, and the magnetic cross-linked chitosan has good adsorption performance and thermal stability and cannot be decomposed along with temperature rise; besides, themagnetic cross-linked chitosan has good recycling and cyclic regeneration capacity, so that the service life of the material is prolonged, the cyclic utilization rate of the material is increased, andmeanwhile, the treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a magnetic cross-linked chitosan and its preparation method and application. Background technique [0002] At present, tetracycline (tetracycline, TC) has gradually become the second most widely used antibiotic in the world, and is widely used in human medicine, veterinary medicine, animal growth promoter and so on. According to reports, only a small amount of tetracycline can be absorbed by metabolism, while most of tetracycline is excreted through urine and feces, and residual tetracycline is frequently monitored in sewage, surface water and even groundwater. [0003] Tetracycline residues in the environment may promote the growth of Antibiotic Resistant Bacteria (ARB) and Antibiotic Resistance Genes (ARG), thereby posing risks to human health. Therefore, in order to prevent the harmful effects of tetracyclines on the ecological environment and public health, it is of ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/34C02F101/38
CPCB01J20/06B01J20/24B01J20/28009B01J20/28011C02F1/286C02F2101/34C02F2101/345C02F2101/38
Inventor 彭思伟谷小兵刘海洋白玉勇李叶红麻晓越荆亚超
Owner DATANG ENVIRONMENT IND GRP
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