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Anionic polymer grafted chitosan magnetic composite microsphere and preparation method and application

An anionic polymer, magnetic composite microsphere technology, applied in separation methods, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of unsatisfactory adsorption effect, secondary pollution separation and recycling, etc., to achieve regeneration and reuse Easy, low recovery cost, simple operation effect

Inactive Publication Date: 2017-11-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the above-mentioned deficiencies existing in the prior art, the object of the present invention is to provide a kind of anionic polymer grafted chitosan magnetic composite microspheres, which solves the problem that the current dye adsorbents have an unsatisfactory adsorption effect on cationic dyes, and solves the problem of The secondary pollution of the adsorbent to the environment and the problem of separation and recycling

Method used

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  • Anionic polymer grafted chitosan magnetic composite microsphere and preparation method and application
  • Anionic polymer grafted chitosan magnetic composite microsphere and preparation method and application
  • Anionic polymer grafted chitosan magnetic composite microsphere and preparation method and application

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Effect test

Embodiment 1

[0033] A preparation method of anionic polymer grafted chitosan magnetic composite microspheres, comprising the steps of:

[0034] 1. Cross-linking reaction: Dissolve 2.5g chitosan in 85.0ml hydrochloric acid solution (hydrochloric acid mass fraction 0.5%), prepare a solution with chitosan mass fraction 3%, Fe 3 o 4 Nanoparticles were ultrasonically dispersed in the above solution (Fe 3 o 4 The mass ratio of nanoparticles to chitosan is 1:5), after stirring evenly, add to 250ml cyclohexane (the volume ratio of cyclohexane to chitosan solution is 3:1), after mixing evenly, add 3ml mass fraction 50% glutaraldehyde aqueous solution (the molar ratio of glutaraldehyde to chitosan is 1:1), cross-linked at 50°C for 1 hour to obtain chitosan magnetic composite microspheres, which were scanned by infrared spectroscopy, as shown in figure 1 As shown in the middle curve a, the composite microsphere has the characteristic absorption peaks of hydroxyl group, imino group and C=N double b...

Embodiment 2

[0039] 1. Cross-linking reaction: (same as Example 1).

[0040] 2. Copolymerization reaction: fill the obtained chitosan magnetic composite microsphere dispersion with N 2 After 10 minutes, add potassium persulfate (potassium persulfate is 10% of the amount of chitosan), and after 5 minutes, add anionic monomer 2-acrylamide-2-methylpropanesulfonic acid (AMPS) (AMPS and chitosan The ratio of sugar to substance is 5:1), and the copolymerization reaction was carried out at 50°C for 3 hours. After the completion of the copolymerization reaction, anionic polymer-grafted chitosan composite microspheres were obtained, and its adsorption capacity for methylene blue was 451.33 mg / g.

Embodiment 3

[0042] 1. Cross-linking reaction: (same as Example 1).

[0043] 2. Copolymerization reaction: fill the obtained chitosan magnetic composite microsphere dispersion with N 2 After 10 minutes, add potassium persulfate (potassium persulfate is 10% of the amount of chitosan substance), and after 5 minutes, add anionic monomer acrylic acid (AA) (the ratio of AA to chitosan substance is 5:1) , Copolymerization reaction at 50℃ for 3h, after the completion of the copolymerization reaction, anionic polymer grafted chitosan composite microspheres were obtained, and its adsorption capacity for methylene blue was 302.86 mg / g.

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Abstract

The invention discloses an anionic polymer grafted chitosan magnetic composite microsphere and a preparation method and application. The compound takes a chitosan magnetic composite microsphere as a core and a grafted anionic polymer as a brush. The preparation method comprises the following steps: preparing the chitosan and an Fe3O4 nanoparticle into a chitosan magnetic composite microsphere by using a reverse emulsion crosslinking method, and then performing copolymerization on the chitosan magnetic composite microsphere and an anionic monomer to generate the anionic polymer grafted chitosan magnetic composite microsphere. The anionic polymer grafted chitosan magnetic composite microsphere prepared by the preparation method provided by the invention can effectively remove a cationic dye and has the advantages of large adsorption capacity, easy separation under an external magnetic field, repeated use after desorption and no influence on adsorption effect. The preparation method is simple to operate, and the cost is low.

Description

technical field [0001] The invention relates to a preparation method and application of a cationic dye adsorbent, in particular to an anionic polymer grafted chitosan magnetic composite microsphere and a preparation method and application thereof. It belongs to the field of polymer composite materials. Background technique [0002] Dye wastewater is one of the main sources of water pollution in my country. Adsorption is widely used for the removal of dyes in water because of its simple operation, low cost and reusability. Currently the most commonly used adsorbent is activated carbon, but it is costly and difficult to recover and recycle. [0003] Cationic dyes are a kind of textile dyes, also known as basic dyes and salt-based dyes. Soluble in water, it is in a cationic state. Cationic dyes are soluble in water and ionized in aqueous solution to generate dyes with positively charged colored ions. The cation of the dye can combine with the acidic group of the third monome...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J20/34C02F1/28C02F101/38
CPCB01J20/264B01J20/28021B01J20/3475C02F1/285C02F2101/308C02F2101/38
Inventor 郑怀礼郑超凡闫正乾徐斌成宋昀茜杨雅珺刘永芝
Owner CHONGQING UNIV
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