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A kind of preparation method of grafted magnetic chitosan adsorbent

The technology of chitosan and adsorbent is applied in the field of preparation of grafted magnetic chitosan adsorbent, which can solve the problems of affecting adsorption performance, reducing the number of active groups of chitosan, etc., so as to improve adsorption performance and adsorption rate. Fast and easy recycling

Active Publication Date: 2020-03-31
深圳市深水环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the above-mentioned deficiencies that exist in the prior art, the purpose of this invention is to provide a kind of preparation method of grafted magnetic chitosan adsorbent, can reduce chitosan activity after solving existing iron ferric oxide and chitosan cross-linking The number of groups, which affects the adsorption performance

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  • A kind of preparation method of grafted magnetic chitosan adsorbent
  • A kind of preparation method of grafted magnetic chitosan adsorbent
  • A kind of preparation method of grafted magnetic chitosan adsorbent

Examples

Experimental program
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Embodiment 1

[0029] The preparation method of the present embodiment graft type magnetic chitosan adsorbent comprises the steps:

[0030] 1) Preparation of magnetic chitosan microspheres

[0031] Dissolve 1.5 g of chitosan in 35 mL of 0.5% hydrochloric acid and stir evenly. Disperse 1 g of magnetic Fe3O4 nanoparticles in 5 mL of water. Mix the two to obtain a dispersion and stir evenly; Put hexane and 1.25 mL of Span 80 in a 250 mL three-necked flask, add the dispersion liquid into the three-necked flask under stirring, and mix well; raise the temperature to 50°C, add 0.95 mL of glutaraldehyde with a mass fraction of 50% Solution (wherein glutaraldehyde is 0.45g), reacted for 1 hour to obtain magnetic chitosan microspheres.

[0032] 2) Preparation of grafted magnetic chitosan adsorbent

[0033] Disperse 3.1 g of the above-mentioned magnetic chitosan microspheres prepared in 100 mL of water; 2 Add 10 mL of potassium persulfate solution with a concentration of 0.05 g / mL and react for 5 mi...

Embodiment 2

[0039] The preparation method of the present embodiment graft type magnetic chitosan adsorbent, the steps are as follows:

[0040] 1) Preparation of magnetic chitosan microspheres: same as the preparation method in Example 1.

[0041] 2) Preparation of grafted magnetic chitosan adsorbent

[0042]Disperse 3.1 g of magnetic chitosan microspheres prepared in step 1) in 100 mL of water; 2 Add 12 mL of potassium persulfate solution with a concentration of 0.05 g / mL and react for 5 minutes; raise the temperature to 40 °C, add 8 mL of dimethylaminoethyl methacrylate solution, and react for 5 hours to obtain grafted magnetic chitosan sugar adsorbent.

[0043] Adsorption application of alizarin green solution: the magnetic chitosan microspheres and grafted magnetic chitosan adsorbent prepared in this example were added to the aqueous solution containing alizarin green dye (1600 mg / L), After shaking for 24 hours, the adsorption of alizarin green dye by the above two microspheres in w...

Embodiment 3

[0046] The preparation method of the present embodiment graft type magnetic chitosan adsorbent, the steps are as follows:

[0047] 1) Preparation of magnetic chitosan microspheres: same as the preparation method in Example 1.

[0048] 2) Preparation of grafted magnetic chitosan adsorbent

[0049] Disperse 3.1 g of magnetic chitosan microspheres prepared in step 1) in 100 mL of water; 2 Add 10 mL of potassium persulfate solution with a concentration of 0.05 g / mL and react for 5 minutes; raise the temperature to 60 °C, add 15 mL of dimethylaminoethyl methacrylate solution, and react for 3 hours to obtain grafted magnetic chitosan sugar adsorbent.

[0050] Adsorption application to alizarin green solution: Add the magnetic chitosan microspheres and grafted magnetic chitosan adsorbent prepared above into the aqueous solution containing alizarin green dye (1000 mg / L), and shake for 24 h, determination of the above two microspheres adsorbing alizarin green dye in water. Among th...

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Abstract

The invention discloses a preparation method of a grafted magnetic chitosan adsorbent. The preparation method comprises the following steps: evenly dispersing magnetic chitosan microspheres into water, then keeping the dispersed liquid to be in the nitrogen atmosphere, adding a potassium persulfate initiator, and evenly mixing; after that, adding dimethylaminoethyl methacrylate into the obtained mixture, and carrying out a grafting reaction at the temperature of 30-70 DEG C to obtain the grafted magnetic chitosan adsorbent. The grafted magnetic chitosan adsorbent prepared by the method is large in adsorption capacity of printing and dyeing wastewater and rapid in adsorption rate of the printing and dyeing wastewater; the adsorption capacity of the grafted magnetic chitosan adsorbent is 6-10 times larger than that of unmodified magnetic chitosan microspheres, and the adsorption rate of the grafted magnetic chitosan adsorbent is far higher than that of the unmodified magnetic chitosan microspheres; the grafted magnetic chitosan adsorbent greatly improves the adsorption property of the magnetic chitosan microspheres, is easy to recover and can be recycled; after being subjected to repeated adsorption and desorption, the grafted magnetic chitosan adsorbent still has a better adsorption effect, so that the recycling of the adsorbent is realized.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a preparation method of a grafted magnetic chitosan adsorbent. Background technique [0002] The problem of water pollution is becoming more and more serious all over the world. Due to its strong toxicity and difficulty in biodegradation, dye wastewater will cause great harm to animals and plants in the environment if it exists in the environment for a long time. It has become an urgent water environment problem to be solved. Among many water treatment methods, the adsorption method is considered to be a practical water treatment method due to its high efficiency and quickness. However, currently commonly used adsorbents, such as activated carbon, graphene oxide, activated alumina, etc., have problems such as high price, high energy consumption, low reuse efficiency, and some by-products are produced, and most adsorbents are only for Specific pollutants have higher adsor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30
Inventor 郑怀礼王永娟徐斌成蒙泓延向文英李梦茹余子薇
Owner 深圳市深水环境科技有限公司