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Chitosan/biochar composite aerogel ball as well as preparation method and application thereof

A composite airgel and composite hydrogel technology, applied in the field of chitosan/biochar composite airgel balls, to achieve the effects of simple and easy raw materials, superior adsorption performance, and improved mechanical strength

Pending Publication Date: 2021-12-24
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of chitosan airgel in terms of mechanical strength, chemical stability and appearance, the invention provides a preparation method of chitosan / biochar composite airgel balls

Method used

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  • Chitosan/biochar composite aerogel ball as well as preparation method and application thereof
  • Chitosan/biochar composite aerogel ball as well as preparation method and application thereof
  • Chitosan/biochar composite aerogel ball as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: a kind of preparation method of chitosan / biochar composite airgel ball, its preparation process comprises: first utilize potassium hydroxide activation and high-temperature pyrolysis biomass corn cob to prepare biochar, then dissolve chitosan In the acetic acid solution, add the pre-prepared biochar and the cross-linking agent epichlorohydrin, fully disperse in the chitosan matrix, and then drop it into the alkaline coagulant through a syringe pump at an even speed to obtain The formed chitosan / biochar composite hydrogel is finally vacuum freeze-dried to make chitosan / biochar composite airgel balls;

[0035] The specific steps are:

[0036] (1) Prepare biochar; wash the surface of the collected biomass corncobs, dry them for use, mix 1.0g of biomass corncobs with 2.0g of potassium hydroxide solid and put them into a porcelain boat (50*20*20mm) , keep pyrolysis in a nitrogen medium in a tube furnace at 600°C (heating rate 4°C / min) for 1h, and then cool dow...

Embodiment 2

[0043]Embodiment 2: a kind of preparation method of chitosan / biochar composite airgel ball, comprises following preparation steps:

[0044] (1) Preparation of biochar; rinse the surface of the collected biomass corncobs, and dry them for later use. Mix 1.0g of biomass corn cob with 2.0g of potassium hydroxide solid and put it into a porcelain boat (50*20*20mm), keep the heat in a 600°C tube furnace (heating rate of 4°C / min) in a nitrogen medium Solution for 1h, then cool down naturally. The resulting pyrolysis product is washed (deionized water and 95% ethanol solution), ground and dried to obtain porous biochar;

[0045] (2) prepare chitosan / biochar composite airgel ball;

[0046] 1) Add 0.2g chitosan to 3.8mL acetic acid solution (2wt.%), stir until completely dissolved to obtain a 5% chitosan solution;

[0047] 2) Add 0.02 g of biochar and 0.1 g of epichlorohydrin to the above chitosan solution according to a certain ratio (the mass ratio of biochar / chitosan is 10%), and...

Embodiment 3

[0052] (1) prepare biochar;

[0053] Rinse the surface of the collected biomass corncobs and dry them for later use. Mix 1.0g of biomass corn cob with 2.0g of potassium hydroxide solid and put it into a porcelain boat (50*20*20mm), keep the heat in a 600°C tube furnace (heating rate of 4°C / min) in a nitrogen medium Solution for 1h, then cool down naturally. The resulting pyrolysis product is washed (deionized water and 95% ethanol solution), ground and dried to obtain porous biochar;

[0054] (2) prepare chitosan / biochar composite airgel ball;

[0055] 1) Add 0.2g chitosan to 3.8mL acetic acid solution (2wt.%), stir until completely dissolved to obtain a 5% chitosan solution;

[0056] 2) Add 0.03 g of biochar and 0.1 g of epichlorohydrin to the above chitosan solution according to a certain ratio (the mass ratio of biochar / chitosan is 15%), and mix by ultrasonication for 3 hours at 65° C.;

[0057] 3) After the above mixed solution is cooled to room temperature, add (5mL) ...

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Abstract

The invention relates to a chitosan / biochar composite aerogel ball as well as a preparation method thereof, wherein the chitosan / biochar composite aerogel ball takes chitosan and biochar as base materials, the base materials are cross-linked by epichlorohydrin, the cross-linked base materials are formed in an alkaline coagulant, and finally vacuum freeze drying is performed to obtain the composite aerogel ball. Biomass corncobs are activated by potassium hydroxide and pyrolyzed at high temperature to obtain porous biochar, the porous biochar can be used as a framework supporting material of a chitosan matrix, the mechanical strength of the composite aerogel ball is improved, epoxy chloropropane is utilized for crosslinking, the chemical stability of the composite aerogel ball is improved, and the regular morphology of the composite aerogel ball is beneficial to use, separation and recovery. The chitosan / biochar composite aerogel ball prepared by the method has rich functional groups and a highly developed three-dimensional porous structure, and the adsorption capacity of the chitosan / biochar composite aerogel ball on an anti-inflammatory drug ketoprofen reaches 102 mg / g. The adsorbed composite aerogel ball can be soaked and desorbed by using ethanol. The chitosan / biochar composite aerogel ball prepared by the method can be used for efficiently separating ketoprofen-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a chitosan / biochar composite airgel ball, its preparation method and application. Background technique [0002] With the rapid development of medical and personal care fields, anti-inflammatory drugs, antibiotics, hormones and other organic drugs have produced high trace concentrations (from ng / L to μg / L) in water bodies, which has attracted great attention from all walks of life . These organic micro-pollutants are continuously discharged into natural waters by hospitals and factories through wastewater. However, the non-biodegradability and serious toxicity of pharmaceutical pollutants will have a potential impact on aquatic organisms and threaten human life and health. These serious consequences have led to pharmaceutical pollutants being included in the dynamic "watch list" of the EU Water Framework Directive and the UNESCO "Emerging Pollutants in W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/34
CPCB01J20/24B01J20/20B01J20/28047B01J20/28019C02F1/288C02F2101/34
Inventor 欧阳金波陈建周利民刘峙嵘
Owner EAST CHINA UNIV OF TECH
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