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Beta-cyclodextrin polymer and preparation method thereof and application method of beta-cyclodextrin polymer in treatment of anionic dye wastewater

A cyclodextrin polymer, anionic dye technology, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of low surface area and poor adsorption performance, and achieve high specific surface area, adsorption High efficiency, simple and quick results

Inactive Publication Date: 2018-09-28
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

β-cyclodextrin can form host-guest complexes with pollutants, but to date, reported cross-linked β-cyclodextrin polymers have low surface area and poor adsorption performance compared with conventional activated carbons.

Method used

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  • Beta-cyclodextrin polymer and preparation method thereof and application method of beta-cyclodextrin polymer in treatment of anionic dye wastewater
  • Beta-cyclodextrin polymer and preparation method thereof and application method of beta-cyclodextrin polymer in treatment of anionic dye wastewater
  • Beta-cyclodextrin polymer and preparation method thereof and application method of beta-cyclodextrin polymer in treatment of anionic dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, preparation β-cyclodextrin polymer (EA-CDP)

[0035] 0.962g β-cyclodextrin, 0.5g cross-linking agent tetrafluoroterephthalonitrile and 1.23g basic salt compound K 2 CO 3 Add to 27ml tetrahydrofuran (THF) and 3ml N,N-dimethylformamide (DMF) mixed solvent (V THF :V DMF =9), nitrogen flow for 5 minutes, after 48 hours of polymerization at 85°C, with 1mol / L hydrochloric acid washing the solid on the filter paper, remove residual K 2 CO 3 , until CO 2 After the release is complete, wash the obtained solid with 20ml of deionized water, 20ml of tetrahydrofuran, and 20ml of dichloromethane in sequence, then freeze-dry the solid in a high-vacuum liquid nitrogen bath for 10-20 minutes, and then vacuum-dry it at room temperature for 2-3 days to obtain The β-cyclodextrin polymer CDP after the first step of substitution reaction. Take 230 mg of CDP prepared in the above experiment, inject 20 mL of EA in a nitrogen atmosphere, and stir for 48 hours at a reaction t...

Embodiment 2

[0036] Embodiment 2, EA-CDP adsorption methyl orange experiment

[0037] Mix 10 mg of the β-cyclodextrin polymer EA-CDP obtained in Example 1 with 10 ml of a methyl orange solution with an initial concentration of 30 mg / l, and place it in a water bath constant temperature shaker at 30 ° C at 170 r min -1 The speed is oscillated for 30 minutes. After shaking, the solid and the solution were separated by suction filtration with 0.2 μm polytetrafluoroethylene filter paper. Measure the residual concentration of methyl orange in the sample by UV-vis ultraviolet-visible spectrometry (measurement wavelength is the absorbance A at 464nm place), can remove methylene blue in water and reach more than 95% within 2 hours. The β-cyclodextrin complex can be regenerated by immersing the ultrasonic β-cyclodextrin complex in ethanol, and the experiment cycle is 5 times, and the polymer has no performance loss and is small.

Embodiment 3

[0038] Embodiment 3, EA-CDP adsorption Congo red experiment

[0039] Mix 3 mg of the β-cyclodextrin polymer EA-CDP obtained in Example 1 with 10 ml of the Congo red solution with an initial concentration of 30 mg / l, and place it in a water bath constant temperature shaker at 30 ° C at 170 r min -1 The speed is oscillated for 30 minutes. After shaking, the solid and the solution were separated by suction filtration with 0.2 μm polytetrafluoroethylene filter paper. Measure the residual concentration of Congo red in the sample by UV-vis ultraviolet-visible spectrometry (measurement wavelength is the absorbance A at 497nm place), can remove Congo red in water and reach more than 95% within 2 hours. The β-cyclodextrin complex can be regenerated by immersing the ultrasonic β-cyclodextrin complex in ethanol, and the experiment cycle is 5 times, and the polymer has no performance loss and is small.

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Abstract

The invention discloses a beta-cyclodextrin polymer and a preparation method thereof and an application method of the beta-cyclodextrin polymer in treatment of dye wastewater. The preparation method of the beta-cyclodextrin polymer comprises the steps of: performing a polymerization reaction on beta-cyclodextrin (beta-CD), a cross-linking agent (tetrafluoroterephthalonitrile, TFPN) and a basic salt compound in an organic solvent in an inert atmosphere so as to obtain a polymer, performing a reaction between the obtained polymer with ethanolamine (EA) to obtain a product which is the porous beta-cyclodextrin polymer (EA-CDP). Through the prepared porous beta-cyclodextrin polymer, methyl orange, congo red, acid blue 83, acid yellow G and other anionic dye pollutants in water can be removed quickly, and the beta-cyclodextrin polymer has an adsorption rate constant larger than that of an activated carbon material and low price; in addition, the beta-cyclodextrin polymer can be regeneratedmultiple times under mild conditions and has small loss of performance.

Description

technical field [0001] The invention belongs to the technical field of dye adsorption in wastewater treatment, in particular to a method for preparing an anionic dye adsorbent and using it to treat anionic dye wastewater. Background technique [0002] In recent years, the problem of water pollution has become increasingly prominent. As an important source of water pollution, dye wastewater has greatly endangered the ecological environment and human health. For example, common anionic dyes such as methyl orange, Congo red, acid blue 83, and acid yellow G are It is difficult to degrade and has high biological toxicity. When discharged into water bodies, it will not only directly endanger the growth of aquatic animals and plants, destroy the soil, but also damage human health through bioaccumulation. At present, the treatment methods of dye wastewater mainly include adsorption, chemical precipitation, membrane separation, biological methods, etc. Among them, the methods of adso...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C08B37/16C02F1/28C02F101/30
CPCB01J20/24C02F1/285C02F2101/308C08B37/0012
Inventor 江洪流高伟谢小林
Owner NANCHANG HANGKONG UNIVERSITY
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