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Beta-cyclodextrin polymer and preparation method as well as method for treating cationic dye wastewater by using beta-cyclodextrin polymer

A technology of cyclodextrin polymers and cationic dyes, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of poor adsorption performance and low surface area of ​​β-cyclodextrin polymers , to achieve the effect of high adsorption efficiency, fast adsorption rate and efficient removal

Inactive Publication Date: 2018-09-21
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, the reported crosslinked 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 as well as method for treating cationic dye wastewater by using beta-cyclodextrin polymer
  • Beta-cyclodextrin polymer and preparation method as well as method for treating cationic dye wastewater by using beta-cyclodextrin polymer
  • Beta-cyclodextrin polymer and preparation method as well as method for treating cationic dye wastewater by using beta-cyclodextrin polymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0035] 0.962g β-cyclodextrin (β-CD), 0.5g cross-linking agent (tetrafluoroterephthalonitrile, TFPN) 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), logical nitrogen 5 minutes, carry out polymerization reaction at 85 ℃ after 48 hours, wash the solid on the filter paper with 1mol / L hydrochloric acid, 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 500mg of CDP in a 250ml one-mouth bottle, prepare NaOH with a concentration of 20%, and then take 40...

Embodiment 2

[0036] Example 2, CDP-COOH adsorption methylene blue experiment

[0037] Adsorbent dosage β-cyclodextrin polymer CDP-COOH: 10mg / 25ml; initial concentration of methylene blue solution: 50mg / l; contact time: shaking time is 0-60min, shaking temperature and speed: 30°C at a constant speed of 170r / min oscillation. After shaking, the solid and the solution were separated by suction filtration with 0.2 μm polytetrafluoroethylene filter paper. The residual concentration of methylene blue in the sample is determined by UV-vis ultraviolet-visible spectroscopy, and the methylene blue in water can be removed to more than 95% within 10 minutes. The ultrasonic β-cyclodextrin complex is soaked in ethanol, the β-cyclodextrin complex can be regenerated, and the experiment cycle is 5 times, and the polymer has no loss of adsorption performance and is small.

Embodiment 3

[0038] Example 3, CDP-COOH adsorption methyl violet experiment

[0039] Adsorbent dosage β-cyclodextrin polymer CDP-COOH: 10mg / 25ml; initial concentration of methylene blue solution: 50mg / l; contact time: shaking time is 0-60min, shaking temperature and speed: 30°C at a constant speed of 170r / min oscillation. After shaking, the solid and the solution were separated by suction filtration with 0.2 μm polytetrafluoroethylene filter paper. The residual concentration of methyl violet in the sample is determined by UV-vis ultraviolet-visible spectroscopy, and it can remove more than 95% of methyl violet in water within 30 minutes. 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 as well as a method for treating cationic dye wastewater by using the beta-cyclodextrin polymer. The preparation method of the beta-cyclodextrin polymer comprises the following steps: carrying out polymerization reaction on beta-cyclodextrin (beta-CD), a crosslinking agent (tetrafluoroterephthalonitrile TFPN) anda basic salt compound into an organic solvent in the inert atmosphere; reacting the obtained polymer with sodium hydroxide, thereby obtaining a reaction product, namely a porous beta-cyclodextrin polymer (CDP-COOH). The porous beta-cyclodextrin polymer prepared by the preparation method disclosed by the invention can be used for quickly removing cationic dye contaminants such as methylene blue, malachite green, basic fuchsin, methyl violet and alkaline blackish green in water, and the adsorption rate of the beta-cyclodextrin polymer is greater than that of an activated carbon material. Besides, the polymer can be regenerated for multiple times under mild conditions, and the adsorption performance loss is smaller.

Description

technical field [0001] The invention belongs to the technical field of dye adsorption in wastewater treatment, in particular to a method for preparing a cationic dye adsorbent and using it to treat cationic dye wastewater. Background technique [0002] In recent years, the problem of water pollution has become increasingly prominent. Dye wastewater, as an important source of water pollution, has greatly endangered the ecological environment and human health, such as common methylene blue, malachite green, basic fuchsin, methyl violet, basic dark green and other cations Dyes, due to their refractory degradation and high biological toxicity, will not only directly endanger the growth of aquatic animals and plants and destroy the soil after being discharged into water bodies, 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. Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30
CPCB01J20/24B01J2220/4806B01J2220/4825C02F1/286C02F2101/308
Inventor 江洪流高伟谢小林
Owner NANCHANG HANGKONG UNIVERSITY
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