A kind of polyethylenimine modified chitosan microsphere medium and its preparation and application method
A technology of polyethyleneimine and chitosan microspheres, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problem of reduced ion exchange capacity, reduced adsorption capacity, and dye decolorization Reduced capacity and other issues, to achieve the effect of simple process, easy recycling, and low cost
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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: take 1 g of the above-mentioned aldylated chitosan microsphere medium drained by the G3 f...
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 the CL-CS-PEI microsphere medium is as follows: 1.5 g of the above-mentioned formylated chitosan microsphere medium drained by the G3 funnel was added to 20 mL of 1mol / L NaOH solution containing 200 g / LPEI to make the microspheres The concentration of the medium in the reaction syst...
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 the CL-CS-PEI microsphere medium is as follows: 1.5 g of the above-mentioned formylated chitosan microsphere medium drained by the G3 funnel was added to 15 mL of 1mol / L NaOH solution containing 300 g / LPEI to make the microspheres The concentration of the medium in the ...
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