Chitosan-grafting amino acid magnetic composite microsphere as well as preparation method and application

A technology of magnetic composite microspheres and amino acids, which is applied in the fields of alkali metal compounds, textile industrial wastewater treatment, alkali metal oxides/hydroxides, etc., can solve problems such as difficult and rapid separation, and achieve effective reduction in decolorization, good flocculation, and improved The effect of using efficiency

Inactive Publication Date: 2015-07-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as adsorbent materials, including chitosan, in order to obtain a large specific surface area to improve its adsorption performance, the particle size of the adsorbent is very small, which often makes it difficult to effectively and quickly remove the pollutants after adsorption and removal. water separation
In addition, in order to further improve the water treatment performance of chitosan, under the premise of ensuring its biocompatibility, a large number of other active functional groups are grafted or compounded onto the chitosan chain, and a simple and quick separation method is sought to overcome the Chitosan is not easy to be separated from water quickly, and the preparation of high-efficiency water treatment agent with good separation effect is undoubtedly of great significance to promote the in-depth application of chitosan in water treatment

Method used

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  • Chitosan-grafting amino acid magnetic composite microsphere as well as preparation method and application
  • Chitosan-grafting amino acid magnetic composite microsphere as well as preparation method and application
  • Chitosan-grafting amino acid magnetic composite microsphere as well as preparation method and application

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Effect test

Embodiment 1

[0031] Chitosan and glutamine (weight ratio: 2:1) were mixed and dissolved in an aqueous solution to prepare a 3% solution. After the solution was uniform, the magnetic particles Fe 3 o 4 Disperse in the above polymer solution by ultrasonic (magnetic particles account for 10% of the total weight of chitosan and glutamine), add cyclohexane (the volume ratio of cyclohexane to chitosan / glutamine mixed solution is 5: 1) After adjusting the pH value to 8, add glutaraldehyde aqueous solution (glutaraldehyde accounts for 1% of the weight of chitosan), and cross-link at 50°C for 1 hour to obtain chitosan-grafted glutamine magnetic composite Microsphere samples. Infrared spectra of pure chitosan microspheres and chitosan-grafted glutamine magnetic composite microspheres figure 1 ,From figure 1 (b) see wavenumber 3250cm -1 Broad peaks are O-H and N-H characteristic absorption peaks; 1560cm -1 It is the characteristic absorption peak of the carbonyl group, thus proving that glutamin...

Embodiment 2

[0035] Chitosan and glutamic acid (weight ratio: 19:1) were mixed and dissolved in an aqueous solution to prepare a 2% solution. After the solution was uniform, the magnetic particles Fe 3 o 4 Disperse in the above polymer solution by ultrasonic (magnetic particles account for 10% of the total weight of chitosan and glutamic acid), add cyclohexane (the volume ratio of cyclohexane and chitosan / glutamic acid mixed solution is 1: 1) After adjusting the pH value to 9, add glutaraldehyde aqueous solution (glutaraldehyde accounts for 3% of the weight of chitosan), and cross-link at 65°C for 3 hours to obtain chitosan-glutamic acid magnetic composite microsphere samples (Glutamic acid accounts for 5% of the total weight of the polymer material). Its performance is similar to embodiment 1.

Embodiment 3

[0037] Dissolve chitosan and ornithine in an aqueous solution with a mass mixing ratio of 1:4 to prepare a solution with a total mass concentration of 10%. After the solution is uniform, the magnetic particles Fe 3 o 4 Disperse in the above polymer solution by ultrasonic (magnetic particles account for 20% of the total weight of chitosan and ornithine), add cyclohexane (the volume ratio of cyclohexane to chitosan / ornithine mixed solution is 10: 1) After adjusting the pH value to 10, add glutaraldehyde aqueous solution (glutaraldehyde accounts for 0.1% of the weight of chitosan), and cross-link at 35°C for 0.5 hours to obtain chitosan-ornithine magnetic composite microspheres Sample (80% ornithine by total weight of polymer material). Its performance is similar to embodiment 1.

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Abstract

The invention discloses a chitosan-grafting amino acid magnetic composite microsphere. The microsphere is provided with a core-shell structure, a chitosan-amino acid composite is used as a shell, and a magnetic material is used as a core; the composite is obtained in a grafting method of chitosan and amino acid; the amino acid is one of glutamine, glutamic acid and ornithine; the content of the amino acid in the composite is 5 to 80 percent by weight; the magnetic material is Fe or Fe3O4, and the magnetic material accounts for 10 to 20 percent of the total weight of the chitosan and amino acid. The chitosan-grafting amino acid magnetic composite microsphere can be used as a water treating agent, harmful substances (such as dyestuff substances and metal ions) in water can be effectively eliminated, various functions such as good flocculation, metal ion adsorption, deodorization, decoloration and effective reduction of COD value can be realized, the functions can be completed in a short time, and the application efficiency of the material can be improved. The chitosan-grafting amino acid magnetic composite microsphere has given universality and is applicable to waste water in dyeing enterprises, electroplating enterprises and the like.

Description

technical field [0001] The invention relates to a novel composite material and its application in the field of water environment treatment, in particular to a chitosan-grafted amino acid magnetic composite microsphere, its preparation and application. technical background [0002] In recent years, with rapid economic development and rapid industrial development, water pollution has become increasingly serious; and water is a basic need for human survival. At the same time, the continuous improvement of people's material living standards has also put forward higher requirements for water quality. As far as the current water pollution characteristics are concerned, soluble organic substances and refractory biodegradable compounds in water are increasing year by year, but the current conventional water treatment methods are not effective in removing this type of pollutants. The production of secondary pollutants harmful to the environment will undoubtedly have adverse effects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62C02F103/30
Inventor 杨琥严涵陶雪李爱民
Owner NANJING UNIV
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