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[Physical properties] Chitin, also known as chitin and polyvinylaminoglucose, is a polysaccharide formed by connecting N-acetyl-2-amino-2-deoxy-D-glucose in the form of β-1,4 glycosidic bonds.
Chitin is non-toxic, odorless, alkali-resistant, heat-resistant, light-resistant, corrosion-resistant, and resistant to insects.
[Preparation method] In the actual application process of chitin, the chitin needs to be chemically modified to make it a multifunctional series derivative with high application value
①N,O-carboxymethyl chitosan is a water-soluble amphoteric compound
② Potassium bromide chitin was added to a 5L beaker with 100g of chitin powder and 400mL of 40% NaOH solution to make the chitin powder in suspension
③Alkaline chitin/chitosan is added to a 5L beaker with 200g of chitin powder, 800mL of 40% NaOH solution (with additives) placed at a certain temperature for 1h, and kept at -20℃ for 24h, You can get basic chitin
The preparation method of alkaline chitosan: add chitin to 40% sodium hydroxide solution and maintain it under the action of steam at 100-190℃ for 30-270min, then it can be made
[application]
①Adsorption of metal ions
Example 1: Chitin adsorbs Cr(VI) ions dissolved in water
Example 2: Mycelium chitin removes Ni 2+ from water
②Treat some wastewater with chitin as a carrier to adsorb metal Ni 2+ to treat cyanide-containing wastewater
Related Links: Application of Macroporous Adsorption Resin