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Calabash [8] urea grafted chitosan and preparation method and application thereof

A technology of chitosan and gourd, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problem of low adsorption efficiency, achieve high-efficiency adsorption, wide application prospects, and good antibacterial effect. and thermal stability

Pending Publication Date: 2018-12-21
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the invention is to provide a kind of cucurbit [8] urea grafted chitosan and its Preparation method and application

Method used

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  • Calabash [8] urea grafted chitosan and preparation method and application thereof
  • Calabash [8] urea grafted chitosan and preparation method and application thereof
  • Calabash [8] urea grafted chitosan and preparation method and application thereof

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preparation example Construction

[0017] The invention provides a preparation method of cucurbit [8] urea grafted chitosan, the method comprising: reacting cucurbit [8] urea and chitosan in water as a solvent in the presence of persulfate.

[0018] During the reaction process, persulfate can oxidize CB[8], and combine the carbon at the waist of CB[8] with the chitosan chain to form CB[8] grafted chitosan. The CB[8]-grafted chitosan prepared in this way is a highly efficient adsorbent, which not only has the characteristics of CB[8] molecular recognition, but also has various excellent properties of CS, and can achieve various color systems, The efficient adsorption of dyes of different structures and heavy metal ions has good antibacterial effect and thermal stability.

[0019] In the method of the present invention, preferably, the concrete operating process of cucurbit [8] urea and chitosan reaction comprises:

[0020] (1) Disperse cucurbit [8] urea and persulfate in water, and pass nitrogen gas for 15-40 m...

Embodiment 1

[0047] Disperse 0.4g CB[8] and 0.8g potassium persulfate in the aqueous solution, and pass nitrogen gas for 30 minutes. 0.8g CS was dissolved under acidic conditions and added thereto. Under the protection of nitrogen, stirred and reacted in an oil bath at 80° C. for 8 hours. After the reaction was completed, a brown liquid containing a small amount of precipitate was obtained. Filter the above liquid to collect the clear liquid, dilute the liquid with a small amount of water, and dialyze in 0.02mol / L potassium sulfate dilute solution for 48 hours to remove ungrafted residual impurities. Pour the contents of the dialysis bag into a beaker, add 400ml of ethanol for precipitation, centrifuge to remove the supernatant, and purify the solid with ethanol reverse solid washing, and then dry it in a vacuum oven at 60°C to obtain sample A1.

[0048] The polymer was analyzed by infrared, thermogravimetric and other characterization methods, and it was proved that the synthesized produc...

Embodiment 2

[0050] Disperse 0.4g CB[8] and 0.96g sodium persulfate in the aqueous solution, and pass nitrogen gas for 25 minutes. 0.72g CS was dissolved under acidic conditions and added thereto. Under the protection of nitrogen, stirred and reacted in an oil bath at 70°C for 9h. After the reaction was completed, a brown liquid containing a small amount of precipitate was obtained. Filter the above liquid to collect the supernatant, dilute the liquid with a small amount of water, and dialyze in a dilute 0.024mol / L ammonium sulfate solution for 36 hours to remove ungrafted residual impurities. Pour the contents of the dialysis bag into a beaker, add 300ml of ethanol for precipitation, remove the supernatant by centrifugation, and purify the solid with ethanol reverse solid washing, and then dry it in a vacuum oven at 50°C to obtain sample A2.

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Abstract

The invention relates to the field of the organic synthesis, and discloses calabash [8] urea grafted chitosan and a preparation method and an application thereof. The preparation method comprises thefollowing steps: in the presence of persulfate, enabling calabash [8] urea to react with chitosan in water as a solvent. The CB [8] grafted chitosan prepared by the method has efficient adsorption properties to various color systems, dye with different structures and heavy metal ions.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a cucurbit [8] urea-grafted chitosan and a preparation method and application thereof. Background technique [0002] Chitosan (CS) is a kind of compound formed by connecting 2-acetylamino-2-deoxy-β-D-glucose and 2-amino-2-deoxy-β-D-glucose through β-(1,4) glycosidic bonds. Linear high molecular polymer, the molecular formula is (C 6 h 11 NO 4 ) n , in addition to naturally occurring in Mucorales and other fungal orders, it can also be obtained by removing more than 55% of the acetyl group from chitin, also known as chitosan. Discovered by Rouget Shougu in 1859, it is a kind of alkaline sugar, white, translucent, amorphous, and somewhat pearly solid. Due to different raw materials and preparation methods, its relative molecular mass ranges from hundreds of thousands to millions Chitosan has the characteristics of alkali resistance, corrosion resistance, non-toxic, tasteless a...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30C02F101/20
CPCB01J20/24C02F1/286C02F2101/20C02F2101/308
Inventor 李伟李壮
Owner WUHAN TEXTILE UNIV
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