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Green preparation method and application of lignin-based hydrogel

A lignin-based, hydrogel technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as human injury and environmental hazards, achieve easy operation, reduce environmental pollution problems, steam depressing effect

Inactive Publication Date: 2017-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of these solvents not only causes harm to the environment, but also causes harm to the human body.

Method used

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  • Green preparation method and application of lignin-based hydrogel
  • Green preparation method and application of lignin-based hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of green preparation method of lignin-based hydrogel, the technological process is as follows figure 2 , including the following steps:

[0032] Weigh 5.0g 1-ethyl-3-methylimidazole acetate ([Emim][CH 3 COO]), at 80°C, magnetically stirred for 5min at a speed of 700r / min, adding 0.1g of CaCl 2 Powder (200 mesh), continue to stir for 15min to ensure that CaCl 2 The powder is completely dissolved in 1-ethyl-3-methylimidazole acetate solution, then add 0.1g lignin, stir for 10min, add 1.5g acrylamide and 0.10g N,N'-methylenebisacrylamide, Join 7.77×10 -2 After stirring for 15 minutes, quickly transfer the reaction system to a glass test tube, and react at 75°C for 1.5 hours under the protection of nitrogen or carbon dioxide gas. After the reaction, the hydrogel was taken out and soaked in 2000mL deionized water for 24 hours to remove impurities that did not participate in the reaction and 1-ethyl-3-methylimidazole acetate to obtain a pure lignin-based hydrogel....

Embodiment 2

[0035] A green preparation method of lignin-based hydrogel, comprising the following steps:

[0036] Weigh 5.0g 1-ethyl-3-methylimidazole acetate ([Emim][CH 3 COO]), at 80°C, magnetically stirred for 5min at a speed of 720r / min, adding 0.11g CaCl 2 Powder (300 mesh), continue to stir for 15min to ensure that CaCl 2 The powder is completely dissolved in 1-ethyl-3-methylimidazole acetate solution, then add 0.2g lignin, stir for 10min, add 1.7g acrylamide and 0.10g N,N'-methylenebisacrylamide, join 8.88×10 -2 After stirring for 15 minutes, the reaction system was quickly transferred to a glass test tube, and reacted at 80°C for 1.3 hours under the protection of nitrogen or carbon dioxide gas. After the reaction, the hydrogel was taken out and soaked in 2000mL deionized water for 24 hours to remove impurities that did not participate in the reaction and 1-ethyl-3-methylimidazole acetate to obtain a pure lignin-based hydrogel.

[0037] The lignin described in Example 2 is prepa...

Embodiment 3

[0039] A green preparation method of lignin-based hydrogel, comprising the following steps:

[0040] Weigh 5.0g 1-ethyl-3-methylimidazole acetate ([Emim][CH 3 COO]), at 80°C, magnetically stirred for 5min at a speed of 730r / min, added 0.12g CaCl 2 Powder (400 mesh), continue to stir for 15min to ensure that CaCl 2 The powder was completely dissolved in 1-ethyl-3-methylimidazole acetate solution, then 0.3g lignin was added, stirred for 10min, 2.0g acrylamide and 0.15g N,N'-methylenebisacrylamide were added, Join 9.99×10 -2 After stirring for 15 minutes, quickly transfer the reaction system to a glass test tube, and react at 85°C for 1.2 hours under the protection of nitrogen or carbon dioxide gas. After the reaction, the hydrogel was taken out and soaked in 2000mL deionized water for 24 hours to remove impurities that did not participate in the reaction and 1-ethyl-3-methylimidazole acetate to obtain a pure lignin-based hydrogel.

[0041] The lignin described in Example 3 i...

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Abstract

The invention belongs to the technical field of functional materials, and in particular discloses a green preparation method and application of a lignin-based hydrogel. The preparation method comprises the following steps: adding CaCl2 powder to 1-ethyl-3-methylimidazolium acetate, stirring for dissolving, adding lignin, stirring, then adding acrylamide and N,N'-Methylenebisacrylamide, adding hydrogen peroxide, stirring evenly, and putting reaction system in nitrogen or carbon dioxide gas protection for reaction to obtain the lignin-based hydrogel. The preparation method has the advantages of simple preparation process, easy operation, and pollution-free and green preparation process, and is suitable for industrialized production; the obtained product can adsorb organic dyes in printing and dyeing wastewater, effectively reduces the content of the dyes in the wastewater, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a green preparation method and application of a lignin-based hydrogel. Background technique [0002] In recent years, more and more attention has been paid to the preparation of hydrogels from natural polysaccharide polymers, including chitosan, alginic acid, cellulose, etc. The prepared hydrogel is widely used in many fields such as sewage treatment, wound treatment, genetic engineering, biosensing and drug carrier. [0003] Like cellulose, lignin, as the polysaccharide polymer with the largest reserves in plants after cellulose, is a cheap, easy-to-obtain, abundant and environmentally friendly renewable natural resource. In plant raw materials, the content of lignin is about 15%-35%. Worldwide, about 260,000 tons of lignin are separated from chemical pulping black liquor every year. Most of the lignin is burned during the alkali recovery process. Ho...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/56C08F222/38B01J20/26B01J20/30C02F1/28C02F101/38
CPCC02F1/285C08F289/00B01J20/264C02F2101/38C02F2101/308C08F220/56C08F222/385
Inventor 张志礼杨仁党
Owner SOUTH CHINA UNIV OF TECH
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