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Cationic cyclodextrin-based hydrogel adsorbing material and synthetic method thereof

A technology of adsorption materials and synthesis methods, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of ineffectiveness, small adsorption amount, and less research, and achieve easy access and good quality Recyclability, the effect of simple preparation process

Active Publication Date: 2020-11-27
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In summary, the existing cyclodextrin-based adsorbents can spontaneously capture hydrophobic organic molecules by utilizing multiple reactive hydroxyl functional groups in their structure and having the characteristics of a hydrophilic outer cavity and a hydrophobic inner cavity. and heavy metal ions, but the existing cyclodextrin-based adsorbents have little adsorption capacity for anionic organic matter and phosphorus-based flame retardants in water, and there are few studies, so they cannot achieve the desired effect; at the same time, cyclodextrin itself is easily It is soluble in water, so it must be polymerized before it can be used as an excellent adsorbent. Cyclodextrin is cationized and polymerized, which not only maintains its ability to capture organic molecules, but also has good swelling properties of hydrogels and better stability. sex and chemical tunability etc.

Method used

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  • Cationic cyclodextrin-based hydrogel adsorbing material and synthetic method thereof
  • Cationic cyclodextrin-based hydrogel adsorbing material and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Dissolve 1g of β-cyclodextrin in 25ml of 0.8wt.% sodium hydroxide solution, stir until completely mixed, add 6.5g of 2,3-epoxypropyltrimethylammonium chloride to the solution, heat at 70°C Stir for 4 hours; vacuum dry to constant weight at 80°C to obtain β-cyclodextrin cationic derivative.

[0036] The obtained β-cyclodextrin cationic derivative was dissolved in 2.5 ml of water, 2.5 g of acrylamide was added, and the mixture was stirred at room temperature for 1 hour at a rotational speed of 500 rpm. Then add 0.2g cross-linking agent N,N'-methylenebisacrylamide (MBA), stir until the cross-linking agent MBA is completely dissolved, add 0.25mL accelerator N,N,N',N'-tetramethyl ethyl acetate Diamine (TEMED). When the above substances are mixed uniformly, add 5 mL of saturated potassium persulfate solution (KPS) solution of initiator, and stir at room temperature until hydrogel is formed. The resulting hydrogel was transferred to a glass bottle and immersed in deionized w...

Embodiment 2

[0039] Dissolve 1.5g of β-cyclodextrin in 25ml of 0.8wt.% sodium hydroxide solution, stir until completely mixed, add 10.5g of 2,3-epoxypropyltrimethylammonium chloride to the solution, heat for 70 Stir at °C for 4 hours; vacuum dry at 80 °C to constant weight to obtain β-cyclodextrin cationic derivative.

[0040] The obtained β-cyclodextrin cationic derivative was dissolved in 2.5 ml of water, 2.5 g of acrylic acid was added, and the mixture was stirred at room temperature for 1 hour at a rotational speed of 500 rpm. Then add 0.2g cross-linking agent N,N'-methylenebisacrylamide (MBA), stir until the cross-linking agent MBA is completely dissolved, add 0.25mL accelerator N,N,N',N'-tetramethyl ethyl acetate Diamine (TEMED). When the above substances are mixed evenly, add 5 mL of saturated ammonium persulfate solution (APS) solution of the initiator, and stir at room temperature until a hydrogel is formed. The resulting hydrogel was transferred to a glass bottle and immersed i...

Embodiment 3

[0043] Dissolve 1g of β-cyclodextrin in 25ml of 8wt.% sodium hydroxide solution, stir until completely mixed, add 10.5g of 2,3-epoxypropyltrimethylammonium chloride to the solution, heat at 70°C and stir 6 hours; vacuum drying at 80°C to constant weight to obtain β-cyclodextrin cationic derivatives.

[0044] The obtained β-cyclodextrin cationic derivative was dissolved in 2.5 ml of water, 1 g of acrylic acid was added, and the mixture was stirred at room temperature for 1 hour at a rotational speed of 500 rpm. Then add 0.2g cross-linking agent N,N'-methylenebisacrylamide (MBA), stir until the cross-linking agent MBA is completely dissolved, add 0.25mL accelerator N,N,N',N'-tetramethyl ethyl acetate Diamine (TEMED). When the above substances are mixed uniformly, add 5 mL of saturated potassium persulfate solution (KPS) solution of initiator, and stir at room temperature until hydrogel is formed. The resulting hydrogel was transferred to a glass bottle and immersed in deionize...

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Abstract

The invention discloses a cationic cyclodextrin-based hydrogel adsorbing material and a synthetic method thereof. The synthetic method of the material comprises the following steps of: mixing beta-cyclodextrin with 2, 3-epoxypropyl trimethyl ammonium chloride according to a certain ratio; continuously stirring in an alkaline solution; completing beta-cyclodextrin cationization so as to obtain a beta-cyclodextrin cationic derivative, carrying out a free radical polymerization reaction on the beta-cyclodextrin cationic derivative, acrylamide (or acrylic acid) and methylene bisacrylamide, synthesizing a gel substance at one time, and drying, thereby obtaining the cationic cyclodextrin-based hydrogel adsorbing material. The material has a good adsorption effect on organic pollutants such as phosphorus flame retardants, anionic dyes and organophosphorus pesticides in water, is easy to prepare, has excellent swelling performance, is good in stability within the pH range of 3-11 and high in ion interference resistance, can be regenerated and recycled for multiple times, does not cause secondary pollution and has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite materials and environmental science, and particularly relates to a method for synthesizing a cationic cyclodextrin-based hydrogel adsorption material. Background technique [0002] With the accelerating process of industrialization and the rapid development of the national economy, more and more pollutants enter the environmental medium, resulting in the deterioration of environmental quality. Among them, there are many kinds of organic pollutants, and the generated organic wastewater has also become a serious problem in the field of water pollution control. As a representative organic wastewater, dye wastewater has the characteristics of large water volume, high content of organic pollutants, large alkalinity, and large changes in water quality; it contains azo groups (-N=N-), aromatic rings and sulfonic acid groups. Anionic dyes with acid salt groups may be toxic and potentially carcinogenic;...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/20B01J20/28047B01J20/28054C02F1/285C02F2101/30
Inventor 王毅力李俊仪李小林仝瑶周妍卿
Owner BEIJING FORESTRY UNIVERSITY
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