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Method for dispersing and recovering nano material in water phase based on environmental response polymer

An environment-responsive, nano-material technology, applied in special compound water treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of low dispersibility of nano-materials, difficulty in separation and recovery, etc., and achieve improvement in difficult recovery, temperature control, etc. Reduced energy consumption and improved dispersion

Inactive Publication Date: 2021-06-18
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a method for dispersing and recovering nanomaterials based on environmental responsive polymers in the aqueous phase. The present invention solves the problem of poor dispersion of existing nanomaterials through a simple and efficient method. High and Difficult Separation and Recycling Problems

Method used

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  • Method for dispersing and recovering nano material in water phase based on environmental response polymer
  • Method for dispersing and recovering nano material in water phase based on environmental response polymer
  • Method for dispersing and recovering nano material in water phase based on environmental response polymer

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preparation example Construction

[0047] Specifically, the preparation method of the above-mentioned MAH-β-CD-co-PNIPAM includes the following operations:

[0048]a. Dissolve dry β-cyclodextrin (β-CD) and maleic anhydride in N,N-dimethylformamide (DMF), and stir the solution at 80°C for 12h to obtain modified maleic anhydride Cyclodextrin (MAH-β-CD). The obtained product MAH-β-CD was precipitated with chloroform and washed with acetone several times to obtain high-purity MAH-β-CD.

[0049] Wherein, the ratio of the amount of β-cyclodextrin to the reacting substance of maleic anhydride is 1:1.

[0050] b. MAH-β-CD and N-isopropylacrylamide (NIPAM) were dissolved in DMF, and azobisisobutyronitrile (AIBN) was added to obtain a suspension. The resulting suspension was placed in N 2 Under atmosphere and under anhydrous and oxygen-free conditions, the copolymerization reaction is carried out by stirring at 70° C. to 80° C. for 8 to 24 hours. After the end of the copolymerization reaction, the product mixed syste...

Embodiment 1

[0055] A kind of preparation method of environmental response (temperature sensitive) polymer collector:

[0056] a. Dissolve dry β-CD (β-cyclodextrin, 5.68g, 0.05mol) and maleic anhydride (0.49g, 0.05mol) in DMF (30mL), and stir the solution at 80°C for 12h, Maleic anhydride-modified cyclodextrin (MAH-β-CD) was obtained. The obtained product MAH-β-CD was precipitated with chloroform and washed with acetone several times to obtain high-purity MAH-β-CD.

[0057] b. MAH-β-CD (1.249 g, 1 mmol) and NIPAM (1.695 g, 15 mmol) were dissolved in 10 mL of DMF, and AIBN (0.044 g) was added to obtain a suspension. The resulting suspension was placed in N 2 The copolymerization reaction was carried out by stirring at 70° C. for 24 hours under an atmosphere. After the end of the copolymerization reaction, the product mixed system was obtained, and the solution of the obtained product mixed system was poured into a 2000Da dialysis bag for two days of dialysis, and then freeze-dried to obt...

Embodiment 2

[0059] A kind of preparation method of environmental response (temperature sensitive) polymer collector:

[0060] MAH-β-CD was prepared by the method described in step a in Example 1.

[0061] MAH-β-CD (1.249 g, 1 mmol) and NIPAM (1.13 g, 10 mmol) were dissolved in 10 mL of DMF, and AIBN (0.035 g) was added to obtain a suspension. The resulting suspension was placed in N 2 The copolymerization reaction was carried out by stirring at 70° C. for 24 hours under an atmosphere. After the end of the copolymerization reaction, the product mixed system was obtained, and the solution of the obtained product mixed system was poured into a 2000Da dialysis bag for two days of dialysis, and then freeze-dried to obtain MAH-β-CD-co-PNIPAM, that is, Environmentally responsive (temperature sensitive) polymer collector.

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Abstract

The invention discloses a method for dispersing and recovering a nanometer material in a water phase based on an environmental response polymer, and belongs to the technical field of nanometer material dispersion and recovery. The method comprises the following steps: adding a nano material into an aqueous solution containing pollutants to obtain a mixed system; uniformly dispersing an environment response polymer in the obtained mixed system to help the nanometer material to be dispersed so as to obtain a uniform dispersion system; and uniformly dispersing an inorganic salt in the obtained uniform dispersion system, carrying out environmental response treatment and oscillation treatment, and collecting after a floating layer appears on the surface of an aqueous solution, so that recovery of the nano adsorption material in the aqueous phase is achieved. According to the treatment method disclosed by the invention, the dispersibility of the nano material in the aqueous solution can be improved by utilizing the environmental response polymer, and the nano material is collected by utilizing the environmental response polymer, so that the treatment method for dispersing and recovering the nano material in the aqueous phase based on the environmental response polymer is high in collection efficiency, simple and rapid to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of recovery of nanometer materials, and relates to a method for dispersing and recovering nanomaterials based on an environment-responsive polymer in an aqueous phase. Background technique [0002] With the rapid development of modern industry, fresh water resources have been severely damaged, seriously threatening the survival and development of aquatic organisms and human beings. Moreover, the residual pollutants in the environment have a wide range of types and complex and diverse components, causing persistent pollution to water resources. Physical, biological and chemical methods can effectively treat pollutants in wastewater. [0003] Among them, the adsorption method in the physical method has been widely used because of its convenience, quickness and low cost. At present, there are many kinds of adsorbents suitable for water treatment, including alumina, activated carbon and so on. Nanomaterials r...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/26B01J20/30C08F251/00C08F220/54C02F101/36C02F101/38
CPCC02F1/283C02F1/285B01J20/261B01J20/205C08F251/00C02F2101/40C02F2101/38C02F2101/36C02F2305/08
Inventor 赵景婵刘倩徐轶冬陈晓梅黎志强刘杰魏柳林
Owner NORTHWEST UNIV
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