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Polyimidazole ionic liquid modified cellulose-based adsorbent as well as preparation method and application of cellulose-based adsorbent

An ionic liquid and cellulose-based technology, which is applied in the field of preparation and development of high-efficiency adsorbents, can solve the problems of low adsorption capacity of cellulose, few adsorption sites, weak adsorption, etc., achieve low toxicity of reactants and improve adsorption performance , Strong adsorption effect

Active Publication Date: 2018-12-28
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a cellulose-based adsorbent modified by polyimidazole ionic liquid and its preparation method and application, the adsorbent can effectively solve the problem of low adsorption capacity of cellulose in the water phase, and In the existing modification technology, the single-grafted imidazole-based ionic liquid functional group has few adsorption sites and weak adsorption

Method used

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  • Polyimidazole ionic liquid modified cellulose-based adsorbent as well as preparation method and application of cellulose-based adsorbent
  • Polyimidazole ionic liquid modified cellulose-based adsorbent as well as preparation method and application of cellulose-based adsorbent
  • Polyimidazole ionic liquid modified cellulose-based adsorbent as well as preparation method and application of cellulose-based adsorbent

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preparation example Construction

[0036] The present invention also discloses a preparation method of the cellulose-based adsorbent modified by the polyimidazole ionic liquid, comprising the following steps:

[0037] S1. Immerse 2g of cellulose in 25mL of a certain concentration of sodium periodate aqueous solution, place it in a water bath at 30-80°C, and react in the dark for 3-7 hours, then add 3mL of ethylene glycol and react for 1 hour to prepare dialdehyde base cellulose crude product;

[0038] S2. Repeatedly washing the dialdehyde-based cellulose crude product in S1 with deionized water and ethanol, washing away the unreacted sodium periodate and ethylene glycol solution on the surface of the dialdehyde-based cellulose, and washing until the supernatant is medium Until the property is obtained, dialdehyde-based cellulose is obtained;

[0039] S3. Dissolve 1-vinylimidazole and 3-bromopropylamine hydrobromide in 20 mL of absolute ethanol, stir the mixture under a nitrogen atmosphere, and reflux at 60-80°...

Embodiment 1

[0052] The process of the preparation method of a kind of polyimidazole ionic liquid modified cellulose-based adsorbent in the present embodiment comprises the following steps:

[0053] 1) Submerge 2g of nanocellulose membrane (structure shown in formula (2)) in 25mL of 32g·L -1 Sodium periodate aqueous solution, placed in a water bath at 50°C, and reacted in the dark for 4 hours, and then added 3 mL of ethylene glycol to react for 1 hour to prepare a crude dialdehyde-based cellulose.

[0054]

[0055] 2) After the reaction is finished, wash repeatedly with deionized water and ethanol to remove unreacted sodium periodate and ethylene glycol solution on the surface of the dialdehyde-based cellulose, and wash until the supernatant is neutral to obtain the dialdehyde-based fiber The structure is shown in formula (3).

[0056]

[0057] 3) Add 1-vinylimidazole and 3-bromopropylamine hydrobromide at a mass ratio of 2:1 to a container (such as a 25mL round-bottomed flask), dis...

Embodiment 2

[0065] The process of the preparation method of a kind of polyimidazole ionic liquid modified cellulose-based adsorbent in the present embodiment comprises the following steps:

[0066] 1) Submerge 2g bacterial cellulose membrane (structure shown in formula (2)) in 25mL 16g L -1 The sodium periodate aqueous solution was placed in a water bath at 50°C, and reacted in the dark for 5 hours, and then 3 mL of ethylene glycol was added to react for 1 hour to prepare a crude dialdehyde-based cellulose.

[0067] 2) After the reaction is finished, wash repeatedly with deionized water and ethanol to remove unreacted sodium periodate and ethylene glycol solution on the surface of the dialdehyde-based cellulose, and wash until the supernatant is neutral to obtain the dialdehyde-based fiber The structure is shown in formula (3).

[0068] 3) Add 1-vinylimidazole and 3-bromopropylamine hydrobromide at a mass ratio of 2.1:1 to a container (such as a 25mL round bottom flask), dissolve the two...

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Abstract

The invention provides a polyimidazole ionic liquid modified cellulose-based adsorbent as well as a preparation method and an application of the cellulose-based adsorbent. The method comprises the steps as follows: step 1, preparing dialdehyde cellulose and a polyimidazole ion liquid respectively; step 2, immersing dialdehyde cellulose in water, dissolving the polyimidazole ion liquid in an HCl solution, mixing a dialdehyde cellulose water solution and the HCl solution of the polyimidazole ion liquid, controlling the pH in the range of 2.5-3.5, and performing stirring at 20-45 DEG C for 4-8 hto obtain a polyimidazole ion liquid modified cellulose crude product; step 3, washing the polyimidazole ion liquid modified cellulose crude product with ethanol and water, and drying the product to obtain the polyimidazole ionic liquid modified cellulose-based adsorbent. The adsorbent can effectively solve the problems of low adsorption capacity of cellulose in a water phase and single grafted imidazolium ionic liquid functional groups have few adsorption sites and weak adsorption functions in the prior modification art and can be used for treating dye wastewater.

Description

technical field [0001] The invention belongs to the technical field of preparation and development of high-efficiency adsorbents, and relates to a cellulose-based adsorbent modified by polyimidazole ionic liquid and its preparation method and application. Background technique [0002] In recent years, due to the rapid development of printing and dyeing, textile, and papermaking industries, environmental pollution has become increasingly serious, especially the discharge of wastewater containing dyes and heavy metals has increased year by year. Due to the high toxicity of printing and dyeing wastewater, which is easy to cause cancer and teratogenicity, its treatment has become an urgent problem to be solved. There are currently many methods used to treat printing and dyeing wastewater, such as electrolysis, ultrafiltration, chemical flocculation, chemical oxidation, adsorption, dialysis, and anaerobic-aerobic. Based on the advantages of high efficiency, low cost and easy ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/22B01J20/24C02F1/285C02F1/286C02F2101/20C02F2101/308
Inventor 钱立伟杨苗秀许亮刘文倩张楠张素风
Owner SHAANXI UNIV OF SCI & TECH
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