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Preparation method of high-adsorbability chitosan aerogel

A technology of chitosan and airgel, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of insufficient adsorption of chitosan aerosol, and achieve Good application prospect, good adsorption effect and good stability

Pending Publication Date: 2021-07-30
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the prepared chitosan aerosol adsorption is still not enough

Method used

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  • Preparation method of high-adsorbability chitosan aerogel
  • Preparation method of high-adsorbability chitosan aerogel
  • Preparation method of high-adsorbability chitosan aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 2.0853g of chitosan to 100mL of 1% v / v hydrochloric acid aqueous solution and stir for 2h, let it stand for 1h until the chitosan solution is clear and transparent; add 1.5mL of acrolein into the chitosan solution, stir at 25°C for 1h and then Stand still for 3 hours to obtain hydrogel; soak and wash with pure water several times for 18 hours, then freeze-dry the gel to obtain chitosan airgel adsorption material with a gel mass of 0.4167 g. The adsorption capacity of the adsorption material for methylene blue is 500mg / g (the initial concentration of methylene blue solution is 500mg / L, the pH value of the reaction solution is 6, and the reaction temperature is 308K).

Embodiment 2

[0029] Add 0.5052g of chitosan to 100mL of 0.5% v / v glacial acetic acid aqueous solution and stir for 1h, then sonicate for 0.5h until the chitosan solution is clear and transparent; add 360μL of acrolein into the chitosan solution, Ultrasound for 0.5 h and then stand still for 2 h to obtain a hydrogel; after soaking and washing with pure water for 21 h, the gel was freeze-dried to obtain a chitosan airgel adsorption material with a gel mass of 0.2438 g. The adsorption capacity of the adsorption material for methylene blue is 772mg / g (the initial concentration of methylene blue solution is 450mg / L, the pH value of the reaction solution is 6, and the reaction temperature is 308K).

Embodiment 3

[0031] Add 8.574g of chitosan to 100mL of 2% v / v nitric acid aqueous solution and mechanically stir for 2h, then let stand for 3h until the chitosan solution is clear and transparent; dilute 6.0mL of acrolein in 30mL of pure water, slowly add to the shell In the polysaccharide solution, mechanically stir at 80°C for 0.1h and then stand still for 0.1h to obtain hydrogel; soak and wash with pure water for 48h, freeze-dry the gel to obtain chitosan airgel Adsorption material, gel mass is 6.757g. The adsorption capacity of the adsorption material for methylene blue is 687mg / g (the initial concentration of methylene blue solution is 450mg / L, the pH value of the reaction solution is 6, and the reaction temperature is 308K).

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Abstract

The invention relates to a preparation method of high-adsorbability chitosan aerogel. The preparation method comprises the steps of 1, dissolving chitosan in an acidic aqueous solution; 2, cross-linking diluted alpha, beta-unsaturated aldehyde to the chitosan solution to form gel; and 3, washing with deionized water, and freeze-drying to obtain the chitosan gel material. The synthesis method is simple, and the obtained gel material is a functionalized modified chitosan aerogel material, and has the advantages of large adsorption capacity, good adsorption effect, good stability, high reusability and easy separation on anionic dyes, especially methyl blue dyes in wastewater.

Description

technical field [0001] The invention belongs to the technical field of chitosan materials, and more specifically relates to a preparation method of highly adsorbable chitosan airgel. Background technique [0002] With the rapid development of the chemical industry, the problem of organic wastewater treatment has become more and more serious. The most representative of these is the polluted wastewater produced by the textile printing and dyeing industry. The direct discharge of untreated dye wastewater will pose a threat to aquatic species and humans, thereby destroying the ecosystem and ecological environment. How to efficiently, simply and safely control dye wastewater pollution has become a research hotspot. [0003] Adsorption, as one of the treatment methods for dye wastewater, has the advantages of low operating cost and good treatment effect, and has great application potential in the removal of organic pollutants. However, most traditional adsorbents such as activa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28B01J20/24B01J20/28C02F1/28C08L5/08
CPCC08J9/28B01J20/24B01J20/28014C02F1/286C02F2101/308C02F2101/36C02F2101/38C02F2101/40C08J2305/08C08J2201/0484C08J2205/026
Inventor 李焰刘云唐健张跃飞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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