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Polyethyleneimine modified chitosan microsphere medium as well as preparation and application methods thereof

A technology of polyethyleneimine and chitosan microspheres, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc. Capacity reduction and other issues, to achieve the effect of low cost, simple process, easy to recycle

Active Publication Date: 2015-01-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chitosan microspheres prepared by emulsification and cross-linking have been used in the decolorization of dye wastewater (Adsorptive removal of methyl orange from aqueous solution with crosslinking chitosan microspheres. Journal of Water Process Engineering, 2014, 1:2–7), but the preparation In the chitosan microsphere medium process, because the crosslinking agent occupies a certain amount of active groups, its ion exchange capacity is reduced, that is, the adsorption capacity is reduced, resulting in a reduction in its ability to decolorize dyes

Method used

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  • Polyethyleneimine modified chitosan microsphere medium as well as preparation and application methods thereof
  • Polyethyleneimine modified chitosan microsphere medium as well as preparation and application methods thereof
  • Polyethyleneimine modified chitosan microsphere medium as well as preparation and application methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034]The preparation method of the aldylated CL-CS microsphere medium is as follows: take 1.5g of the chitosan microsphere medium CL-CS drained by the G3 funnel and place it in a 50mL Erlenmeyer flask, add 30mL of glutaraldehyde with a volume fraction of 10%. solution so that the concentration of the microsphere medium in the reaction system was 50 g / L, and reacted at 25° C. on a shaker at 50 rpm for 2 h. After the reaction, the microsphere medium was washed with deionized water and centrifuged repeatedly at a speed of 5000 rpm to remove glutaraldehyde that did not participate in the reaction, so as to prepare a completely aldylated CL-CS microsphere medium. According to the SEM analysis of the scanning electron microscope, it can be seen that the particle size range of the microsphere medium is 50-200 μm.

[0035] The preparation method of the CL-CS-PEI microsphere medium is as follows: 1 g of the above-mentioned aldehylated chitosan microsphere medium that was drained by th...

Embodiment 2

[0037] The preparation method of the aldylated CL-CS microsphere medium is as follows: take 1.8g of the chitosan microsphere medium CL-CS drained by the G3 funnel and place it in a 50mL Erlenmeyer flask, and add 30mL of glutaraldehyde with a volume fraction of 10%. solution so that the concentration of the microsphere medium in the reaction system is 60 g / L, and reacted at 30° C. on a shaker at 100 rpm for 4 hours. After the reaction, the microsphere medium was washed with deionized water and centrifuged repeatedly at a speed of 6000 rpm to remove glutaraldehyde that did not participate in the reaction, and a fully formylated CL-CS microsphere medium was prepared.

[0038] The preparation method of CL-CS-PEI microsphere medium is as follows: the 1.5g above-mentioned aldehydated chitosan microsphere medium that takes G3 funnel to drain is added in the NaOH solution of 20mL containing 200g / L PEI 1mol / L, make microsphere The concentration of the spherical medium in the reaction s...

Embodiment 3

[0040] The preparation method of the aldylated CL-CS microsphere medium is as follows: take 2.0 g of the chitosan microsphere medium CL-CS drained by the G3 funnel and place it in a 50 mL Erlenmeyer flask, and add 20 mL of glutaraldehyde with a volume fraction of 10%. Solution, so that the concentration of the microsphere medium in the reaction system is 100g / L, react at 40°C and 170rpm on a shaking table for 6h. After the reaction, the microsphere medium was washed with deionized water and centrifuged repeatedly at a rotational speed of 8000 rpm to remove glutaraldehyde that did not participate in the reaction, and a completely aldylated CL-CS microsphere medium was prepared.

[0041] The preparation method of CL-CS-PEI microsphere medium is as follows: the 1.5g above-mentioned aldehydated chitosan microsphere medium that the G3 funnel was drained was added to 15mL of 1mol / L NaOH solution containing 300g / L PEI, so that the microsphere The concentration of the spherical medium...

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Abstract

The invention relates to a polyethyleneimine modified chitosan microsphere medium. The medium adopts a crosslinked chitosan microsphere with aldehyde surface, wherein high molecular weight polyethyleneimine is modified on the surface; the weight of polyethyleneimine modified on the surface is 731 plus or minus 32 mu mol / g-1,275 plus or minus 37 mu mol / g according to the ion exchange capacity; the particle size of the polyethyleneimine modified chitosan microsphere medium ranges from 50 mu m to 200 mu m; and the molecular weight of polyethyleneimine molecules ranges from 1,200 to 60,000. According to the polyethyleneimine modified chitosan microsphere medium, the ion exchange capacity of the medium is improved, and accordingly, the decolorization ratio of the medium to dye wastewater is increased; the maximum ion exchange capacity of the polyethyleneimine modified chitosan microsphere medium can be 1,275 plus or minus 37 mu mol / g and is far higher than that of unmodified chitosan microsphere medium with the ion exchange capacity of 418 plus or minus 31 mu mol / g; and the modifying method is simple in process and low in cost.

Description

technical field [0001] The invention belongs to the chromatographic separation technology of dyes in the field of biotechnology, and specifically relates to a polyethylenimine-modified chitosan microsphere medium and a preparation method thereof, and an application in improving the decolorization rate of dyes. Background technique [0002] With the rapid development of food and chemical industries in recent years, dyes have been widely used in food production and chemical printing and dyeing industries. Studies have shown that 15% of dyes will be discharged with industrial wastewater during the production process. If a large amount of dye wastewater is directly discharged into the natural environment, it will not only cause waste of dyes but also pose a serious threat to natural water bodies. Dye wastewater has complex chemical components, high chemical oxygen demand, and is difficult to be biodegraded and utilized. It has become one of the main harmful and difficult-to-trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28
CPCB01J20/267B01J20/28007B01J20/3085B01J2220/44B01J2220/4812C02F1/288
Inventor 荆迎军杨春燕禹雪晴高慧
Owner HEBEI UNIV OF TECH
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