Chitosan/ZIF-8 composite material as well as preparation method and application thereof
A ZIF-8, composite material technology, applied in the field of adsorption, can solve the problems of unsatisfactory product adsorption capacity, easy aggregation, easy loss, etc., and achieves the effect of being suitable for large-scale industrial production, low raw material cost, and low manufacturing cost
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Embodiment 1
[0050] A kind of preparation method of chitosan / ZIF-8 composite material, comprises steps as follows:
[0051] (1) at room temperature, take 2g chitosan and be dissolved in 40mL concentration and be that in the acetic acid solution of 90%, stir well, obtain chitosan acetic acid solution; Dissolve 8g sodium hydroxide in 100mL deionized water, stir well, Obtain the sodium hydroxide solution; then put the chitosan solution into the syringe, drop it into the sodium hydroxide solution at a rate of 30 drops / min, stir it evenly, wash it with deionized water until neutral, add 80mL pentadiene The volume fraction of aldehyde is 0.1% glutaraldehyde aqueous solution, after cross-linking for 5 hours, washing and freeze-drying for 24 hours, chitosan microspheres are obtained;
[0052] (2) At room temperature, weigh 3 mmol of zinc nitrate and add it to 30 mL of methanol solution, stir evenly, continue to add 0.1 g of chitosan microspheres to obtain solution A; add 12 mmol of 2-methylimidazo...
Embodiment 2
[0056] A kind of preparation method of chitosan / ZIF-8 composite material, comprises steps as follows:
[0057] (1) at room temperature, take 2g chitosan and be dissolved in 40mL concentration and be that in the acetic acid solution of 90%, stir well, obtain chitosan acetic acid solution; Dissolve 8g sodium hydroxide in 100mL deionized water, stir well, Sodium hydroxide solution is obtained; then the chitosan solution is put into a syringe, dripped into the sodium hydroxide solution at a rate of 20 drops / min, stirred evenly, washed with deionized water until neutral, and added 80mL of pentamethylene glycol An aqueous solution of glutaraldehyde with a volume fraction of 0.1% was cross-linked for 5 hours, washed, and freeze-dried for 24 hours to obtain chitosan microspheres;
[0058] (2) At room temperature, weigh 3 mmol of zinc nitrate and add it to 30 mL of methanol solution, stir evenly, continue to add 0.5 g of chitosan microspheres to obtain solution A; add 12 mmol of 2-meth...
Embodiment 3
[0062] A kind of preparation method of chitosan / ZIF-8 composite material, comprises steps as follows:
[0063] (1) at room temperature, take by weighing 10g chitosan and be dissolved in 200mL concentration be in the acetic acid solution of 85%, stir well, obtain chitosan acetic acid solution; Dissolve 16g sodium hydroxide in 100mL deionized water, stir, Get the sodium hydroxide solution; then put the chitosan solution into the syringe, drop it into the sodium hydroxide solution at a rate of 60 drops / min, stir it evenly, wash it with deionized water until it is neutral, add 80mL of pentadiene The aldehyde volume fraction is 0.1% glutaraldehyde aqueous solution, after cross-linking 5h, after washing, freeze-drying 24h, obtain chitosan microsphere;
[0064] (2) At room temperature, weigh 15mmol of zinc acetate and add it to 30mL of methanol solution, stir evenly, continue to add 1g of chitosan microspheres to obtain solution A; add 40mmol of 2-methylimidazole to 20mL of methanol,...
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