Preparation method of copper ion-imprinted crosslinking chitosan microsphere

A technology of crosslinking chitosan and chitosan microspheres, which is applied in the field of material science, can solve the problems of poor adsorption performance, increase the coordination space between nitrogen atoms and metal ions, etc., and achieve high adsorption capacity and high selective adsorption Performance, the effect of solving environmental pollution

Inactive Publication Date: 2018-11-16
PUTIAN UNIV
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  • Application Information

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Problems solved by technology

Although the cross-linking reaction solves the resin strength and reusable performance, it also leads to poor adsorption performance compared with that without cross-linking. The main reason is that the cross-linking reaction often occurs on the amino group with high activity, and other After the group, the steric hindrance of the coordination of the nitrogen atom with the metal ion is increased

Method used

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  • Preparation method of copper ion-imprinted crosslinking chitosan microsphere
  • Preparation method of copper ion-imprinted crosslinking chitosan microsphere
  • Preparation method of copper ion-imprinted crosslinking chitosan microsphere

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preparation example Construction

[0023] A preparation method for copper ion imprinted cross-linked chitosan microspheres, comprising the following steps:

[0024] (1) Cu 2+ Preparation of imprinted chitosan microspheres

[0025] According to the dosage ratio of acetic acid solution, chitosan and copper acetate monohydrate is 100 mL: 1-3g: 0.25g, mix 3% acetic acid solution and chitosan, after ultrasonic dissolution is complete, then add acetic acid monohydrate Copper is fully dissolved to obtain copper acetate-chitosan solution;

[0026] Take the copper acetate-chitosan solution with a No. 7 needle, adjust the distance between the needle and the ammonia liquid surface to be 15cm, and drop it into the ammonia solution with a volume fraction of 12-12.5% ​​at a rate of 28-32 drops / min (copper acetate-shell The volume ratio of polysaccharide solution to ammonia solution is 1:2), soak and solidify for 24-28 h to obtain Cu 2+ Imprinted chitosan microspheres; if the microspheres are stored in a wet state in deion...

Embodiment 1

[0031] Cu 2+ Preparation of imprinted chitosan microspheres

[0032] Measure 100mL of acetic acid solution with a concentration of 3% in a beaker, add 1.5g of chitosan powder, and after ultrasonic dissolution is complete, add 0.25g of copper acetate monohydrate to fully dissolve to obtain a copper acetate-chitosan solution; Take 20mL of copper acetate-chitosan solution, take the copper acetate-chitosan solution with No. In the ammonia solution, soak and solidify for 24 hours, and store the microspheres in a wet state in deionized water to obtain wet Cu 2+ Imprinted chitosan microspheres.

Embodiment 2

[0034] Cu 2+ Preparation of imprinted cross-linked chitosan microspheres

[0035] Measure the deionized water of 80mL in the beaker, add the Cu prepared in Example 1 2+ Imprint chitosan microspheres, add 2.5mL epichlorohydrin, and stir at 80°C for 3h to fully cross-link. Add 100 mL of dilute hydrochloric acid solution with a concentration of 1 mol / L to elute Cu at 60°C 2+ Multiple times until no Cu is detected in the eluent 2+ Till this time, wash with deionized water until pH = 6, and store the microspheres in a wet state in deionized water to obtain wet state Cu 2+ Imprinted cross-linked chitosan microspheres; if the microspheres were dried at 45 ℃, dry Cu 2+ Imprinting of cross-linked chitosan microspheres.

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Abstract

The invention discloses a preparation method of a copper ion-imprinted crosslinking chitosan microsphere, and belongs to the field of material science. The preparation method comprises the following steps of using copper ions as template ions, using chitosan as a functional monomer, using epichlorohydrin as a crosslinking agent, and eluting the copper ions by hydrochloric acid, so as to prepare the copper ion-imprinted crosslinking chitosan microsphere. The prepared copper ion-imprinted crosslinking chitosan microsphere has higher adsorption ability and selective adsorption property on the copper ions, and has the advantages that the adsorption and eluting speeds are quick, the operation is simple and is easy to implement, and the regeneration and recycling effects are realized.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a preparation method of copper ion imprinted cross-linked chitosan microspheres. Background technique [0002] With the development of my country's industry, more and more Hg-containing 2+ 、Ni 2+ 、Cu 2+ , Pb 2+ 、Cd 2+ Wastewater containing heavy metal ions is discharged into environmental water bodies. Heavy metals have the characteristics of high toxicity, refractory degradation, and easy accumulation in organisms. Moreover, heavy metals are difficult to degrade and eventually deposit into the human body through the food chain, causing great harm to the ecological environment and human health. Copper has a particularly high affinity with certain tissues in the human body, and when combined, it will inhibit the activity of enzymes, thereby producing a toxic effect on the human body. In addition, copper is a very important valuable metal, and losing it in sewage i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C08J3/24C08L5/08C02F101/20
CPCB01J20/268C02F1/285C02F2101/20C08J3/24C08J2305/08
Inventor 傅明连陈彰旭朱丹琛黄秋云叶玉娟
Owner PUTIAN UNIV
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