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Method of modifying magnetic chitosan with ethylenediamine and application of diclofenac in wastewater treatment

A technology of chitosan acetic acid and ethylenediamine, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as poor chemical stability, achieve simple operation, mild reaction conditions, and avoid secondary pollution effect

Active Publication Date: 2019-01-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, chitosan also has some problems in practical application: chitosan mainly exists in powder form, has poor chemical stability, and it is difficult to quickly and effectively separate it from water when performing adsorption experiments.

Method used

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  • Method of modifying magnetic chitosan with ethylenediamine and application of diclofenac in wastewater treatment
  • Method of modifying magnetic chitosan with ethylenediamine and application of diclofenac in wastewater treatment
  • Method of modifying magnetic chitosan with ethylenediamine and application of diclofenac in wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) 1.65g chitosan is dissolved in the acetic acid solution that 75ml volume fraction is 3%, stirs and mixes, makes clear chitosan acetic acid solution A;

[0033] (2) Ferric salt and ferrous salt are added to solution A in step (1) at a molar ratio of 2:1, stirred and mixed evenly to form solution B (concentration of ferric salt is 36.07g / L );

[0034] (3) Use a syringe to slowly and evenly drop solution B into 3mol / L NaOH solution (the volume ratio of the two is 1:3), stir for 1h, and solidify for 2h-3h. Wash the formed magnetic chitosan particles repeatedly with deionized water, and after washing to neutrality, soak the pellets in deionized water for subsequent use;

[0035] (4) Add the pellets in (3) to 500mL of water, add 2.5ml of glutaraldehyde solution, stir evenly, soak for 24 hours, after the reaction, wash the pellets with absolute ethanol and deionized water for later use.

[0036] (5) Put the crosslinked pellets into 400ml of deionized water, adjust the pH...

Embodiment 2

[0038] (1) 1.65g chitosan is dissolved in the acetic acid solution that 75ml volume fraction is 3%, stirs and mixes, makes clear chitosan acetic acid solution A;

[0039] (2) Ferric salt and ferrous salt are added to solution A in step (1) at a molar ratio of 2:1, stirred and mixed evenly to form solution B (concentration of ferric salt is 36.07g / L );

[0040] (3) Use a syringe to slowly and evenly drop solution B into 3mol / L NaOH solution (the volume ratio of the two is 1:3), stir for 1h, and solidify for 2h-3h. Wash the formed magnetic chitosan particles repeatedly with deionized water, and after washing to neutrality, soak the pellets in deionized water for subsequent use;

[0041] (4) Add the pellets in (3) to 500mL of water, add 2.5ml of glutaraldehyde solution, stir evenly, soak for 24 hours, after the reaction, wash the pellets with absolute ethanol and deionized water for later use.

[0042] (5) Put the cross-linked pellets into 400ml of deionized water, adjust the p...

Embodiment 3

[0044] (1) 1.65g chitosan is dissolved in the acetic acid solution that 75ml volume fraction is 3%, stirs and mixes, makes clear chitosan acetic acid solution A;

[0045] (2) Ferric salt and ferrous salt are added to solution A in step (1) at a molar ratio of 2:1, stirred and mixed evenly to form solution B (concentration of ferric salt is 36.07g / L );

[0046] (3) Use a syringe to slowly and evenly drop solution B into 3mol / L NaOH solution (the volume ratio of the two is 1:3), stir for 1h, and solidify for 2h-3h. Wash the formed magnetic chitosan particles repeatedly with deionized water, and after washing to neutrality, soak the pellets in deionized water for subsequent use;

[0047] (4) Add the pellets in (3) to 500mL of water, add 4ml of glutaraldehyde solution, stir evenly, soak for 24 hours, after the reaction, wash the pellets with absolute ethanol and deionized water for later use.

[0048] (5) Put the crosslinked pellets into 400ml of deionized water, adjust the pH to ...

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Abstract

The invention provides a method of modifying magnetic chitosan with ethylenediamine and an application of diclofenac in wastewater treatment and belongs to the technical field of material preparationand water environmental protection. The method of modifying the magnetic chitosan with the ethylenediamine is characterized in that an one-step precipitation method is adopted to allow pellets to slowly drop into an alkaline solution and form spherical adsorbents, so that separation and precipitation are easy, and secondary pollution to water bodies is avoided, and the method is simple in operation and mild in reaction conditions; magnetic separation technology is adopted to organically combine ferroferric oxide with chitosan molecules, so that synthesized adsorbent pellets are made to be magnetic and can be quickly and efficiently separated from wastewater under the action of an external magnetic field. Furthermore, the method of modifying the magnetic chitosan with the ethylenediamine has the advantages of being capable of increasing the chemical stability of the chitosan by crosslinking with glutaraldehyde, increasing adsorption sites of contaminants with the number of amino groupson the chitosan molecules increased after the modification with the ethylenediamine, and thus enhancing adsorption capacity of the diclofenac.

Description

technical field [0001] The invention relates to a preparation method of ethylenediamine-modified magnetic chitosan pellets for absorbing diclofenac in waste water, and belongs to the technical fields of material preparation and water environment protection. Background technique [0002] In recent years, with the development of industry and the improvement of people's living standards, PPCPs (pharmaceuticals and personal care products) are widely used in people's lives. Due to the low biodegradability, the detection amount of PPCPs in the water environment has increased year by year, becoming a new type of pollutant. Diclofenac is a non-steroidal anti-inflammatory drug, which is commonly used in the treatment of rheumatoid arthritis, articular rheumatism, etc. The total annual consumption is nearly 1,000 tons. , fast, and convenient features have gradually attracted the attention of researchers. [0003] Chitosan is obtained by deacetylation of chitin, which exists widely i...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/36
CPCB01J20/06B01J20/24B01J20/28009B01J20/28016C02F1/281C02F1/286C02F2101/36
Inventor 刘元坤赵丽媛
Owner BEIJING UNIV OF TECH
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