Preparation method for carboxymethyl chitosan gel ball

A carboxymethyl chitosan gel ball, carboxymethyl chitosan technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of low swelling degree, pollutants Low removal rate and other problems, to achieve the effect of high toughness, convenient solid-liquid separation, and suitable for large-scale production

Active Publication Date: 2015-09-30
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The present invention aims at the shortcomings of metal ion cross-linked carboxymethyl chitosan gel balls with low swelling degree and low removal rate of pollutants, and provides a carboxymethyl chitosan gel with high swelling degree and fast and efficient removal of heavy metal pollution in water bodies. The preparation method of base chitosan gel ball

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  • Preparation method for carboxymethyl chitosan gel ball
  • Preparation method for carboxymethyl chitosan gel ball
  • Preparation method for carboxymethyl chitosan gel ball

Examples

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Effect test

example 1

[0048] Example 1: Weigh 1.5g carboxymethyl chitosan in a 100mL plastic beaker, add 50mL deoxygenated water and magnetically stir to dissolve, and the solution concentration is 3.0% (w / v). Use a pipette gun to pipette 3mL carboxymethyl chitosan solution dropwise into a glass beaker filled with 50mL0.3mol / L acetic acid solution to form a pellet, and strengthen it in the acid for 40min, so that the pellet becomes transparent and solid white small ball. Then put the strengthened pellets into an Erlenmeyer flask containing 50 mL of 0.5% glutaraldehyde solution (containing 5 mL of 0.3 mol / L acetic acid solution), and cross-link at 40° C. for 9 to 12 hours. Rinse off excess glutaraldehyde solution with ultra-pure water, then immerse the pellet in 1mol / L NaOH solution, wait until the pellet turns white into light yellow transparent pellet, then rinse off excess lye with ultra-pure water. The gel balls prepared under this condition have poor spheroidity, high degree of water swelling,...

example 2

[0049] Example 2: Weigh 1.5g of carboxymethyl chitosan in a 100mL plastic beaker, add 50mL of deoxygenated water and magnetically stir to dissolve, and the solution concentration is 3.0% (w / v). Use a pipette gun to pipette 3mL carboxymethyl chitosan solution dropwise into a glass beaker filled with 50mL1.0mol / L acetic acid solution to form a pellet, and strengthen it in the acid for 15min, so that the pellet becomes transparent and solid white small ball. Then put the strengthened pellets into an Erlenmeyer flask containing 50 mL of 2.5% glutaraldehyde solution (containing 5 mL of 0.3 mol / L acetic acid solution), and cross-link at 60° C. for 3 to 5 hours. Rinse off excess glutaraldehyde solution with ultra-pure water, then immerse the pellet in 1mol / L NaOH solution, wait until the pellet turns white into light yellow transparent pellet, then rinse off excess lye with ultra-pure water. The gel balls prepared under this condition have poor spheroidity and low water swelling deg...

example 3

[0050] Example 3: Weigh 1.5g carboxymethyl chitosan in a 100mL plastic beaker, add 50mL deoxygenated water and magnetically stir to dissolve, the solution concentration is 3.0% (w / v). Use a pipette gun to pipette 3mL carboxymethyl chitosan solution dropwise into a glass beaker filled with 50mL0.3mol / L acetic acid solution to form a pellet, and strengthen it in the acid for 40min, so that the pellet becomes transparent and solid white small ball. Then put the strengthened pellets into an Erlenmeyer flask containing 50 mL of 1.5% glutaraldehyde solution (containing 5 mL of 0.3 mol / L acetic acid solution), and cross-link at 60° C. for 5 to 7 hours. Rinse off excess glutaraldehyde solution with ultra-pure water, then immerse the pellet in 1mol / L NaOH solution, wait until the pellet turns white into light yellow transparent pellet, then rinse off excess lye with ultra-pure water. The gel balls prepared under this condition have poor spheroidity, high water swelling degree, good to...

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Abstract

The invention discloses a preparation method for a carboxymethyl chitosan gel ball, and belongs to the technical field of preparation technologies for the carboxymethyl chitosan gel ball. The preparation method comprises the steps that a certain carboxymethyl chitosan solution is dropped into a certain acetic acid solution to form a ball, intensifying is carried out in the acetic acid solution for a certain time, and the transparent ball is changed into a white solid ball; the intensified ball is put into a glutaraldehyde solution with a certain concentration, crosslinking is conducted at a certain temperature for some hours, then the ball is soaked into a sodium hydroxide solution with a certain concentration, parts which are not crosslinked are eliminated, finally pure water is used for washing the ball until the ball is neutral, and preparation is completed. The prepared carboxymethyl chitosan gel ball can swelled by absorbing water, and the size after the water is absorbed is times and even tens of times as big as the original size. Meanwhile, the removing efficiency of the gel ball for heavy metal contaminants can be strengthened by using the method.

Description

technical field [0001] The invention belongs to the technical field of carboxymethyl chitosan gel ball preparation technology, and in particular relates to a preparation method of carboxymethyl chitosan gel ball suitable for heavy metal pollution removal. Background technique [0002] The chemical name of chitosan is (1,4)-2-amino-2-deoxy-β-D-glucose, which is derived from deacetylation of chitin, so chitosan is also called deacetylated chitin. The relative molecular weight of chitosan ranges from tens of thousands to several million. It is insoluble in water and lye, soluble in inorganic acids such as dilute hydrochloric acid and nitric acid, and soluble in most organic acids. Because chitosan contains a large number of amino groups and hydroxyl groups, it has strong reactivity and can undergo reactions such as hydrolysis, etherification, acylation, carboxymethylation and crosslinking. Not only that, chitosan can also perform ion exchange, chelation and adsorption with man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 谢燕华周廷恒吴玉兰王兰亭易艳覃银红刁志强施国中韩智勇
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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