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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AI-Extracted Technical Summary

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 respons...

Method used

A kind of nanometer material based on environmental response polymer that the present invention provides is dispersed and recovery method in aqueous phase, is to reclaim the nanomaterial collection method in aqueous phase based on the phase transition property of environmental response polymer collection agent, nanometer material Adding the adsorption material into the aqueous solution can not only assist the uniform dispersion of the nanomaterials, but also use the characteristics of phase separation of the environmental responsive polymer collector when the external environment changes to recover the agglomerated polymers and nanomaterials from the aqueous solution to achieve Nanomaterials are recycled again. Therefore, the treatment of pollutants such as organic dyes and persistent organic pollutants in aqueous solutions containing pollutants can be achieved. The method has high collection efficiency and low price, and...

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.

Application Domain

Other chemical processesWater treatment compounds +2

Technology Topic

PollutantEnvironmental chemistry +7

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Examples

Experimental program(12)

Example Embodiment

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

[0048]a. Dissolve the dried β-cyclodextrin (β-CD) and maleic anhydride in N, N-dimethylformamide (DMF), stirring the solution at 80 ° C for 12 h, resulting in maleic anhydride change Ethyl estrole (MAH-β-CD). The resulting product MAH-beta-Cd precipitated with trichloromethane and washed multiple times with acetone to give high purity MAH-β-CD.

[0049] Among them, the ratio of the substance of β-cyclodextrin and maleic anhydride is 1: 1.

[0050] b. Dissolve MAH-β-CD and N-isopropylacrylamide (NIPAM) in DMF and added azo diisobutyronitrile (AIBN) to obtain suspension. The resulting suspension is in n 2 The copolymerization reaction was carried out at 70 ° C to 80 ° C under anhydrous aerobic condition for 8 to 24 hours under anhydrous oxygen-free conditions. After the copolymerization reaction, the product mixing system was obtained, and the resulting product mixture was poured into the 2000 DA dialysis bag for two days of dialysis, and then refrigerated dry treatment, and the purified maleic anhydride modified cycperine and N-isopropyl acrylamide copolymer (MAH-β-CD-CO-PNIPAM), i.e., a environmental response (temperature sensitive) polymer collection agent. The synthesis route of the environmental response (temperature sensitive) polymer collector of the present invention is like figure 1 Indicated.

[0051] Among them, the ratio of the substance of the reaction of MAH-β-CD and NIPAM is 1: 10 to 20.

[0052] Among them, the amount of AIBN is 1.5% of the sum of the monomer quality used.

Example Embodiment

[0054] Example 1

[0055] Method for preparing an environmental response (temperature sensitive) polymer collection:

[0056] a. Dry β-Cd (β-cyclodextrin, 5.68 g, 0.05 mol) and maleic anhydride (0.49 g, 0.05 mol) were dissolved in DMF (30 mL), and the solution was stirred at 80 ° C for 12 h. The maleic anhydride-modified cyclodextrin (MAH-β-CD) was obtained. The resulting product MAH-beta-Cd precipitated with trichloromethane and washed multiple times with acetone to give high purity MAH-β-CD.

[0057] b. Dissolve MAH-β-Cd (1.249 g, 1 mmol) and NiPAM (1.695 g, 15 mmol) in 10 mLDMF, and AIBN (0.044 g) was added to give a suspension. The resulting suspension is in n 2 The coast reaction was carried out at 70 ° C for 24 hours under atmosphere. After the copolymerization reaction, the product mixing system was obtained, and the solution of the obtained product mixture was poured into 2000 Da dialysis bag for two days of dialysis, and then the freeze-drying treatment was performed, and MAH-β-Co-Co-PNIPAM was obtained. Environmental response (temperature sensitive) polymer collection agent.

Example Embodiment

[0058] Example 2

[0059] Method for preparing an environmental response (temperature sensitive) polymer collection:

[0060] MAH-β-CD was obtained by the method described in Embodiment 1.

[0061] MAH-β-Cd (1.249 g, 1 mmol) and NIPAM (1.13 g, 10 mmol) were dissolved in 10 mLDMF and the AIBN (0.035 g) was added to obtain suspension. The resulting suspension is in n 2 The coast reaction was carried out at 70 ° C for 24 hours under atmosphere. After the copolymerization reaction, the product mixing system was obtained, and the solution of the obtained product mixture was poured into 2000 Da dialysis bag for two days of dialysis, and then the freeze-drying treatment was performed, and MAH-β-Co-Co-PNIPAM was obtained. Environmental response (temperature sensitive) polymer collection agent.

PUM

Property	Measurement	Unit
Adsorption capacity	95.0	mg/g
Adsorption capacity	50.71	mg/g
Adsorption capacity	29.0	mg/g

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Classification and recommendation of technical efficacy words

Improve dispersion

Preparation method of conductive macromolecule non-covalent functionalized graphene modified electrokinetic energy conversion polymer material

InactiveCN105461948AImprove dispersionhigh dielectric constant

Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

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

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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