Preparation method of magnetic cellulose nanocrystal

A technology of cellulose and nanocrystals, applied in the field of cellulose, can solve the problems of uneven distribution, incomplete combination of magnetic nanoparticles and cellulose materials, etc.

Active Publication Date: 2014-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing magnetic cellulose nanocrystals in which iron ferric oxide is more uniformly and more tightly distributed on the surface of cellulose nanocrystal materials, so as to solve the problem that the current magnetic nanoparticles and cellulose materials are not tightly combined and distributed. uneven problem

Method used

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  • Preparation method of magnetic cellulose nanocrystal
  • Preparation method of magnetic cellulose nanocrystal
  • Preparation method of magnetic cellulose nanocrystal

Examples

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Embodiment 1

[0026] Add microcrystalline cellulose to 6mol / L hydrochloric acid solution, wherein the solid-to-liquid ratio of microcrystalline cellulose to acid solution is 1:25g / mL, and the mixed solution is reacted at 80°C, the stirring rate is 1000r / min, and the reaction is 90min. After the end, move the reactant into a centrifuge tube, centrifuge at 4000r / min for 5min, pour off the supernatant, and then add deionized water, wherein the volume of deionized water is the same as that of the hydrochloric acid solution added before, and then centrifuge at 4000r / min Centrifuge for 5 minutes to obtain a crude product of cellulose nanocrystals. The morphology of the nanocrystalline crude product after freeze-drying is image 3 shown.

[0027] Get 6.6g cellulose nanocrystal thick product, add 200ml iron ion concentration and be 0.09455mol / L solution, wherein Fe 3+ Accounting for 64.21% of the total moles of iron ions, Fe 2+ accounted for 35.79%, stirring at a rate of 1000r / min for 10min, the...

Embodiment 2

[0030] Add cotton to 6mol / L hydrochloric acid solution (different examples try to use different acid solutions), wherein the solid-to-liquid ratio of microcrystalline cellulose to hydrochloric acid solution is 1g:25mL, and the mixed solution reacts with 100°C and the stirring rate is 2000r / min , after the reaction is over, move the reactant into a centrifuge tube, centrifuge at 4000r / min for 5min, pour off the supernatant, and then add deionized water, wherein the deionized water is twice the volume of the acid solution added before, and then in Centrifuge at 4000r / min for 5min to obtain a crude product of cellulose nanocrystals.

[0031] Get 6.6g cellulose nanocrystal thick product, add 200ml iron ion concentration and be 0.1891mol / L solution, wherein Fe 3+ Accounting for 50% of the total moles of iron ions, Fe 2+ accounted for 50%, stirring at a stirring rate of 5000r / min for 10min, then adding 30ml of a chitosan solution with a mass concentration of 2%, stirring for 50min ...

Embodiment 3

[0033] Add bacterial cellulose to 6mol / L hydrochloric acid solution, wherein the solid-to-liquid ratio of microcrystalline cellulose and acid solution is 1:25g / mL, the mixed solution is reacted at 80°C, and the stirring rate is 1000r / min. After the reaction is completed, the The reactant was transferred into a centrifuge tube, centrifuged at 4000r / min for 5min, poured off the supernatant, and then added deionized water, wherein the volume of deionized water was the same as that of the acid solution added before, and then centrifuged at 4000r / min for 5min to obtain Cellulose nanocrystalline crude product. Get 6.6g cellulose nanocrystal thick product, add 200ml iron ion concentration and be 0.1891mol / L solution, wherein Fe 3+The ratio to the total number of moles of iron ions is 55, Fe 2+ Accounting for 45%, after stirring for 10 minutes, add 30ml of 4% chitosan solution, stirring at a rate of 1000r / min, and stirring for 50min. Then add 20ml of 12% sodium tripolyphosphate aque...

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Abstract

The invention discloses a preparation method of a magnetic cellulose nanocrystal. The method comprises the steps: adding cellulose raw materials into an acid solution, stirring at the temperature of 30-105 DEG C for 0.5-24h to react, and washing to obtain a cellulose nanocrystal; adding the cellulose nanocrystal into a 0.00005-1mol / L ferric salt solution, stirring for 0.1-3h, adding a chitosan solution, and stirring to obtain a cellulose nanocrystal and metal ion complex mixed solution; adding a sodium tripolyphosphate solution, stirring for 1-60min, adding an alkaline solution to adjust the pH value to 8-13, and reacting at the temperature of 20-90 DEG C for 0.1-3h; and after the reaction is ended, washing by using deionized water, and drying to obtain a magnetic cellulose material. Chitosan is added in the step of mixing the cellulose nanocrystal and the ferric salt solution, so that ferric ions are complexed with the chitosan, and furthermore, ferroferric oxide is more uniformly and tightly distributed on the surface of the cellulose nanocrystal material.

Description

technical field [0001] The invention relates to cellulose, in particular to a preparation method of magnetic cellulose nanocrystals. Background technique [0002] Cellulose is one of the most abundant natural polymers in the world, and the high value-added utilization of cellulose is a research hotspot at home and abroad. Cellulose nanocrystals have high crystallinity, high mechanical strength, large specific surface area and other properties, and have good application prospects in food, medicine, biology, new energy and other fields. [0003] Due to the good dispersibility and small size of cellulose nanocrystals, the separation process is relatively difficult, so the development of magnetic cellulose nanocrystal materials will further apply cellulose nanocrystal materials in the fields of biology, medicine, energy, materials, etc. is of great significance. [0004] In the preparation of magnetic cellulose, there are mainly co-precipitation methods (Chia, C., Zakaria, S.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L1/02C08L5/08C08K3/22C08B15/08C12N11/14C12N11/12C12N11/10
Inventor 娄文勇曹诗林宗敏华黄宇美
Owner SOUTH CHINA UNIV OF TECH
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