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Porous [beta]-cyclodextrin cross-linked polymer nanofiber and preparation method thereof and application thereof in removing bisphenol organic pollutants in water body

A technology of cross-linked polymers and nanofibers, which is applied in the field of nanomaterials, can solve the problems of low adsorption and binding capacity and low removal efficiency of low-concentration pollutants, and achieve good adsorption performance, strong adsorption affinity, and strong adsorption and binding energy. Effect

Active Publication Date: 2020-05-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems of the existing β-cyclodextrin polymer adsorbents in the process of efficiently adsorbing and removing bisphenol organic pollutants in water bodies, such as low adsorption and binding capacity and low removal efficiency for low-concentration pollutants , to provide a porous β-cyclodextrin cross-linked polymer nanofiber with excellent adsorption properties and its preparation method and its application in the removal of bisphenol organic pollutants in water. The nanofiber can be conveniently modified into commercial cotton On fabric fibers, the obtained composite adsorption material can effectively avoid the problem of separation difficulties faced by nano-adsorption materials in the actual water treatment application process

Method used

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  • Porous [beta]-cyclodextrin cross-linked polymer nanofiber and preparation method thereof and application thereof in removing bisphenol organic pollutants in water body
  • Porous [beta]-cyclodextrin cross-linked polymer nanofiber and preparation method thereof and application thereof in removing bisphenol organic pollutants in water body
  • Porous [beta]-cyclodextrin cross-linked polymer nanofiber and preparation method thereof and application thereof in removing bisphenol organic pollutants in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation and synthesis of β-CD NFs

[0033] (1) 24g NaOH, 3.405gβ-CD were dissolved in 130mL water, 1.023g CuCl 2 2H 2 Dissolve O in 20mL of water, then mix the two and stir evenly, filter to remove the precipitate, add 200mL of absolute ethanol to the obtained filtrate, at this time, a light blue precipitate precipitates, shake the solution gently, and centrifuge until the precipitate is fully separated. The precipitate was washed with absolute ethanol for 2-3 times, and dried in vacuum to obtain β-CD-Cu MOF NFs.

[0034] For the crystal structure (single crystal analysis results) of the β-CD-Cu MOF NFs see figure 1 , in the structure of β-CD-Cu MOF NFs, two β-CD molecules coordinate with four copper ions and five sodium ions respectively through their secondary hydroxyl groups (13) to form a cyclodextrin dimer form ( figure 1 B), these dimers are connected by hydrogen bonding between the primary hydroxyl groups of β-CD to form a two-dimensional nanotu...

Embodiment 2

[0038] Example 2: Preparation and synthesis of cotton fabric modified by β-CD NFs

[0039] (1) Suspend and disperse 0.1g of β-CD-Cu MOF NFs prepared in step (1) of Example 1 in 30mL of absolute ethanol, add cotton fabric, remove it after the cotton fabric is infiltrated, and dry at room temperature to obtain β- Cotton fabric decorated with CD-Cu MOF NFs.

[0040] (2) Under an argon atmosphere, dissolve 2.4g 2,4-TDI and 2 drops (about 100μL) of dibutyltin dilaurate in 80mL of anhydrous DMF, add about thirty sheets of 7cm in diameter and about 1mm thick Cotton fabrics modified with β-CD-Cu MOF NFs were stirred at 75°C for 48 hours. Then the cotton fabric was taken out and soaked twice in DMF, dilute hydrochloric acid (0.1M) and water, respectively, and washed twice to obtain the cotton fabric modified with β-CD NFs.

[0041] The electron microscope characterization figure of the cotton fabric modified by the obtained β-CD NFs can be found in image 3 ,Depend on image 3 It c...

Embodiment 3

[0042] Embodiment 3: Adsorption experiment of bisphenol pollutant

[0043] (1) Add 0.10 g of the prepared β-CD NFs into a conical flask filled with 50 mL of water, ultrasonically disperse evenly, and add 0.2 mM of bisphenol A (bisphenol B, bisphenol F or bisphenol S) Solution 50mL (the final concentration of β-CD NFs in the solution is 1mg / mL), the Erlenmeyer flask was placed in a 25°C water bath, magnetically stirred (500r / min -1 ) 24h. At different time points, 2 mL of the above solution was taken out, filtered, and the absorbance was measured at the maximum absorption wavelength of the bisphenol compound with a UV-visible spectrophotometer to determine the concentration of pollutants in the solution after adsorption to calculate the adsorption capacity and adsorption efficiency.

[0044] Figure 4 Middle a) The adsorption efficiency of β-CD NFs to bisphenol A (BPA), bisphenol B (BPB), bisphenol F (BPF) and bisphenol S (BPS) as a function of time. b) The adsorption effici...

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Abstract

The invention relates to a porous [beta]-cyclodextrin cross-linked polymer nanofiber and a preparation method thereof and application thereof in removing bisphenol organic pollutants in a water body,and relates to the technical field of nano materials. The technical problems that an existing [beta]-cyclodextrin polymer adsorbent is low in adsorption binding capacity and low in removal efficiencyof low-concentration pollutants in the process of efficiently adsorbing and removing bisphenol organic pollutants in a water body are solved. The porous [beta]-cyclodextrin cross-linked polymer nanofiber disclosed by the invention is a porous [beta]-cyclodextrin cross-linked polymer prepared by taking a [beta]-cyclodextrin-copper metal organic framework nano material as a template; the obtained polymer has a large specific surface area; [beta]-cyclodextrin molecules in the metal organic framework material reserve the dimer ordered tubular arrangement mode of the [beta]-cyclodextrin molecules in the metal organic framework material; the dimer structure can form a stable host-guest inclusion compound with bisphenol pollutant molecules through a synergistic effect, so that the cross-linked polymer shows strong adsorption affinity and good adsorption performance on bisphenol pollutants in water.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a porous β-cyclodextrin crosslinked polymer nanofiber, a preparation method thereof, and an application in removing bisphenol organic pollutants in water bodies. Background technique [0002] Bisphenol compounds including bisphenol A (BPA), bisphenol B (BPB), bisphenol F (BPF), bisphenol S (BPS) are one of the common organic pollutants in water. These compounds are widely used in industrial production such as plastics and synthetic resins, and they are also environmental endocrine disruptors that have attracted much attention. When these bisphenols are ingested by the human body or aquatic organisms, they can interfere with the endocrine system by imitating the organism's own hormones, thus posing a great threat to the health of the organism. In the current water treatment system, there is no special effective method for removing bisphenol pollutants in water. Activated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/34
CPCB01J20/267C02F1/285C02F2101/345
Inventor 逯乐慧何文亚任晓燕
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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