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Cellulose aerogel modified by polyionic liquid, preparation method and application thereof

A technology of cellulose airgel and polyionic liquid, which is applied in the field of cellulose airgel modified by polyionic liquid and its preparation, and can solve the problems of poor adsorption effect of cellulose

Active Publication Date: 2020-11-17
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a cellulose airgel modified by polyionic liquid and its preparation method and application, which solves the problem of poor adsorption effect of cellulose, activates the hydroxyl on the surface of cellulose airgel by CDI, and realizes CTA attachment. branches, and obtained highly PIL-modified CA materials by in situ RAFT polymerization, for the adsorption of anionic dyes, functional groups containing aromatic rings or anionic antibiotics

Method used

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  • Cellulose aerogel modified by polyionic liquid, preparation method and application thereof
  • Cellulose aerogel modified by polyionic liquid, preparation method and application thereof
  • Cellulose aerogel modified by polyionic liquid, preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] A kind of preparation method of the cellulose airgel of PIL modification, its synthetic route is as follows:

[0050]

[0051] Wherein, X is selected from any one of the structures shown in formulas (2)-(10):

[0052]

[0053] Specifically, the following method is used to prepare:

[0054] (1) Synthesis of ionic liquid functional monomer IL

[0055]

[0056] Vinylimidazole (VIM) and VBC or BCMBP or BCMB are reacted in a polar solvent at a molar ratio of 1.1:1 at 50°C under an inert gas atmosphere. After the reaction is finished, the product is precipitated by diethyl ether, then the product is purified by dissolution / precipitation (methanol / diethyl ether), and dried to obtain 1-[(4-vinylphenyl)methyl]-3-vinylimidazolium Chloride (EVIM).

[0057] The above polar solvent is selected from any one or more than two of methanol, DMSO, DMF, acetonitrile and acetone.

[0058] Table 1 The dosage table of each reactant

[0059]

[0060] (2) Preparation of pure ce...

Embodiment 1

[0084] A preparation method of a PIL-modified cellulose airgel, the method comprising:

[0085] (1) Synthesis of ionic liquid functional monomers

[0086]

[0087] Vinylimidazole (4.14 g, 0.044 mol) and 4-chloromethylstyrene (6.105 g, 0.040 mol) were added into 10 mL of methanol, and stirred at 50° C. for 24 h under nitrogen.

[0088] After the reaction was finished, the product was precipitated by using 200 mL of diethyl ether, then the product was purified twice by dissolution / precipitation (methanol / diethyl ether), and then the residual solvent was removed by vacuum drying until constant weight, finally obtaining 1-[(4- Vinylphenyl)methyl]-3-vinylimidazolium chloride (EVIM).

[0089] The NMR characterization spectrum of EVIM can be found in figure 1 , whose characterization data are:

[0090] 1 HNMR(DMSO,400MHz,δppm):9.96(a,1H),8.32(b,1H),8.03(c,1H),7.58-7.546(g+h,4H),7.42-7.32(d,1H), 6.79-6.72(e,1H),6.06-6.01(e,1H),5.91-5.86(i,1H),5.51(f,2H),5.43-5.41(j,1H),5.32-5....

Embodiment 2

[0111] A preparation method of a PIL-modified cellulose airgel is basically the same as that of Example 1, the difference being that the structure of the CTA adopted in step (3) is:

[0112]

[0113] The structure of the obtained CA-g-PIL is:

[0114]

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Abstract

The invention discloses a cellulose aerogel modified by a polyionic liquid, a preparation method and application thereof. The cellulose aerogel is obtained by reacting cellulose aerogel CA-CTA modified by a chain transfer agent with an ionic liquid monomer and an initiator in DMSO at 50-80 DEG C in an inert gas atmosphere. According to the cellulose aerogel CA, hydroxyl on the surface of a cellulose aerogel is activated through carbonyl diimidazole CDI, hydrogenation esterification reaction is carried out on the CA to obtain chain transfer agent CTA modified CA, and then in-situ reversible addition fragmentation RAFT polymerization is carried out on the CTA modified CA surface to obtain the PIL functionalized CA material with high PIL grafting amount. The method has the advantages that thereaction conditions are mild, the grafting rate is high, and the obtained cellulose aerogel has an adsorption effect on anionic dyes, aromatic ring functional groups or anionic antibiotics.

Description

technical field [0001] The invention relates to a cellulose aerogel, in particular to a polyionic liquid modified cellulose aerogel and a preparation method and application thereof. Background technique [0002] The dye wastewater produced by all walks of life has problems such as high organic content, complex composition, and deep color, and has become one of the industrial wastewater that is recognized as difficult to control. The discharge of dye wastewater not only hinders the penetration of light, thereby affecting the biological processes in the water body, but also pollutes the groundwater and eventually enters the human body. Since most synthetic dyes are xenobiotics and carcinogens, they can cause potential health problems. In addition, the structure of the dye is complex and stable, making it difficult and slow to degrade. Therefore, the pretreatment of dyes in wastewater is very important for environmental protection and public health. [0003] Currently, techn...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08F251/02C08F226/06B01J20/26B01J20/28B01J20/30B01J13/00C02F1/28C02F101/30C02F101/34C02F101/38
CPCC08J9/28C08F251/02B01J20/265B01J20/28047B01J13/0091C02F1/285C02F1/286B01J2220/4812B01J2220/4825C02F2101/308C02F2101/38C02F2101/34C08F2438/03C08J2205/026C08J2351/02C08F226/06
Inventor 宋文琦
Owner XIJING UNIV
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