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Preparation method of cyclodextrin grafted chitosan polymer with water pollutant separating property

A technology of chitosan polymers and grafted polymers, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as limited application range, chitosan dissolution and loss, and achieve preparation The effect of simple process

Inactive Publication Date: 2015-04-22
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amino groups of chitosan molecules are easily protonated in acid, resulting in the dissolution and loss of chitosan, which greatly limits its application range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1. The preparation of chitosan grafted α-cyclodextrin adsorbent:

[0015] Take 2.5g chitosan, dissolve it in 100mL acetic acid aqueous solution whose volume concentration is 8%, add absolute ethanol to dilute, pass N 2 After deoxygenation, 50 mL of cyclodextrin solution containing 5 g of aldylated α-cyclodextrin was slowly added dropwise within half an hour, and reacted for 12 hours under vigorous stirring at a temperature of 70°C. After the reaction was completed, sodium hydroxide solution was added to precipitate the product, filtered, washed with water until neutral, and finally vacuum-dried at 50°C until the product had a constant quality. Put 0.1g polymer into the aqueous solution of silver nitrate and copper nitrate with a concentration of 10ppm, and obtain the polymer to Ag by solid-liquid extraction. + 、Cu 2+ The removal rates reached 97.95% and 96.31%, respectively.

Embodiment 2

[0016] Embodiment 2: the preparation of chitosan grafted β-cyclodextrin adsorbent:

[0017] Take 2.5g of chitosan, dissolve it in 100mL of 10% acetic acid aqueous solution, add absolute ethanol to dilute, pass N 2 After deoxygenation, 150 mL of cyclodextrin solution containing 15 g of formylated β-cyclodextrin was slowly added dropwise within half an hour, and reacted for 24 hours under vigorous stirring at a temperature of 70°C. After the reaction was completed, sodium hydroxide solution was added to precipitate the product, filtered, washed with water until neutral, and finally vacuum-dried at 50°C until the product had a constant quality. Put 0.1g polymer into the aqueous solution of silver nitrate and copper nitrate with a concentration of 20ppm, and obtain the polymer to Ag by solid-liquid extraction. + 、Cu 2+ The removal rates reached 95.2%, 94.7%, respectively.

Embodiment 3

[0018] Embodiment 3: the preparation of chitosan grafted gamma-cyclodextrin adsorbent:

[0019] Take 2.5g chitosan, dissolve in 100mL acetic acid aqueous solution with a volume concentration of 6%, add absolute ethanol to dilute, pass N 2 After deoxygenation, 100 mL of cyclodextrin solution containing 10 g of formylated γ-cyclodextrin was slowly added dropwise within half an hour, and reacted for 18 hours under vigorous stirring at a temperature of 70°C. After the reaction was completed, sodium hydroxide solution was added to precipitate the product, filtered, washed with water until neutral, and finally vacuum-dried at 50°C until the product had a constant quality. Put 0.05g of polymer into the aqueous solution of silver nitrate and copper nitrate with a concentration of 30ppm, and obtain the polymer to Ag by solid-liquid extraction. + 、Cu 2+ The removal rates reached 93.7%, 92.5%, respectively.

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Abstract

The invention discloses a method for preparing a chitosan grafted cyclodextrin derivative with a water pollutant adsorption function and belongs to the field of an adsorption material preparation technology. The adsorbent is prepared by direct chemical grafting between aldehyde cyclodextrin and chitosan. The preparation process of the polymer is as follows: cyclodextrin containing active aldehyde group and chitosan with amino active functional group are dissolved in a solvent to undergo a Schiff's base reaction at a certain temperature, and chemical grafting of cyclodextrin and chitosan is completed to prepare the graft polymer. The adsorbent has cyclodextrin identification performance and chitosan adsorption performance, has stable performance, has low toxicity, is green and environmentally friendly, and is degradable. The adsorbent can be used in enrichment pretreatment of pollutants in a water body and also can be used in the fields of drug release and molecular recognition. The adsorbent has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a graft polymer with water body pollutant adsorption performance and a preparation method thereof, specifically a cyclodextrin grafted chitosan polymer with water body pollutant adsorption performance and its preparation method. Background technique [0002] With the development of industry, water pollution has become a major environmental problem that threatens human development. Water pollution mainly includes organic pollution and inorganic pollution such as metal ions. These pollutants will enter the human body through the food chain and accumulate in the human body, threatening the lives of animals, plants and humans. At present, there are many methods for treating water pollution, such as extraction, electrochemical method, ion exchange and membrane separation technology. However, the above-mentioned methods often have the disadvantages of high equipment requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08B37/16C08B37/08B01J20/26B01J20/30C02F1/28
Inventor 严峰张婷李俊平陈卓李建华
Owner TIANJIN POLYTECHNIC UNIV
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