Preparation method of xylose residue cellulose nanocrystals and composite hydrogel thereof
A composite hydrogel and cellulose technology, applied in the fields of chemical engineering and polymer materials, can solve the problems of low gel strength and poor toughness, and achieve good biocompatibility, excellent tensile strength and elongation, excellent The effect of anti-protein non-specific adsorption properties
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Embodiment 1
[0024] The xylose residue raw material is dried in a vacuum oven at room temperature and pulverized with a pulverizer, and the xylose residue powder passing through a 40-mesh sieve is collected for future use.
[0025] 0.2g of FeCl 3 Add 25ml of formic acid to 100ml of sulfuric acid solution with a concentration of 60wt%, stir at 70°C for 20min, then add 10g of xylose residue powder, stir well and continue to react at 70°C for 6h, after the reaction is completed, add 900ml of distilled water to carry out Dilute, then centrifuge the mixture at a speed of 10000r / min for 15min, pour out the supernatant to retain the solid content, add 100ml of water to it for dispersion, and centrifuge at a speed of 10000r / min for 15min to wash the precipitate , centrifugation was repeated three times to obtain lignin-containing cellulose nanocrystals. Then add the solid material to a sodium hydroxide solution with a concentration of 2wt%, ultrasonically disperse it for 15 minutes, and then stir...
Embodiment 2
[0028] The xylose residue raw material is dried in a vacuum oven at room temperature and pulverized with a pulverizer, and the xylose residue powder passing through a 40-mesh sieve is collected for future use.
[0029] 0.2g of FeCl 3 Add 25ml of formic acid to 100ml of sulfuric acid solution with a concentration of 60wt%, stir at 70°C for 20min, then add 10g of xylose residue powder, stir well and continue to react at 70°C for 6h, after the reaction is completed, add 900ml of distilled water to carry out Dilute, then centrifuge the mixture at a speed of 10000r / min for 15min, pour out the supernatant to retain the solid content, add 100ml of water to it for dispersion, and centrifuge at a speed of 10000r / min for 15min to wash the precipitate , centrifugation was repeated three times to obtain lignin-containing cellulose nanocrystals. Then add the solid material to a sodium hydroxide solution with a concentration of 2wt%, ultrasonically disperse it for 15 minutes, and then stir...
Embodiment 3
[0032] The xylose residue raw material is dried in a vacuum oven at room temperature and pulverized with a pulverizer, and the xylose residue powder passing through a 40-mesh sieve is collected for future use.
[0033] 0.2g of AlCl 3 Add 25ml of oxalic acid to 100ml of sulfuric acid solution with a concentration of 65wt%, stir at 70°C for 20min, then add 10g of xylose residue powder, stir well, continue to react at 70°C for 6h, and add 900ml of Dilute with distilled water, then centrifuge the mixture at a speed of 10000r / min for 15min, pour out the supernatant to retain the solid content, add 100ml of water to it for dispersion, and centrifuge at a speed of 10000r / min for 15min to wash The precipitate was centrifuged three times to obtain lignin-containing cellulose nanocrystals. Then add the solid material to a sodium hydroxide solution with a concentration of 2wt%, ultrasonically disperse it for 15 minutes, and then stir it at 70°C for 6 hours. Ultrasonic dispersion was ca...
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