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Sodium alginate/N-succinyl chitosan composite aerogel and preparation method and applications thereof

A technology of succinyl chitosan and succinyl chitosan water, which is applied in the field of sodium alginate/N-succinyl chitosan composite airgel and its preparation, can solve the problems of poor fractionation efficiency, low recyclability, Secondary pollution and other problems, to achieve excellent mechanical properties, excellent surface affinity, and environmental friendliness

Active Publication Date: 2019-04-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional separation technologies, such as gravity or centrifugal mechanical separation, adding dispersants or adsorbents, or biological treatment all have problems such as poor fraction efficiency, low recyclability, high energy consumption, or high cost. If the adsorbent or dispersant is not handled correctly, it may even cause secondary pollution

Method used

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  • Sodium alginate/N-succinyl chitosan composite aerogel and preparation method and applications thereof
  • Sodium alginate/N-succinyl chitosan composite aerogel and preparation method and applications thereof
  • Sodium alginate/N-succinyl chitosan composite aerogel and preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of preparation method of sodium alginate / N-succinyl chitosan composite airgel, concrete steps are as follows:

[0032] (1) prepare sodium alginate / N-succinyl chitosan mixed solution;

[0033] A. 0.2g N-succinyl chitosan is added in 10mL water, fully stirred to make it dissolve to obtain 2wt% N-succinyl chitosan solution;

[0034] B. Add 0.8g of sodium alginate into 10mL of water, stir well to dissolve it, and obtain a 7.4wt% sodium alginate solution;

[0035] C. Add the above-mentioned N-succinyl chitosan solution into the alginic acid solution, and ultrasonically disperse for 15 minutes after magnetic stirring for 2 hours to obtain a sodium alginate / N-succinyl chitosan mixed solution;

[0036] (2) Preparation of uncrosslinked sodium alginate / N-succinyl chitosan composite airgel: pour the uniform solution of sodium alginate / N-succinyl chitosan obtained in step (1) into a height of 2 cm , into a cylindrical mold with a diameter of 6 cm, and put it into a freezer...

Embodiment 2

[0046] A kind of preparation method of sodium alginate / N-succinyl chitosan composite airgel, concrete steps are as follows:

[0047] (1) prepare sodium alginate / N-succinyl chitosan mixed solution;

[0048] A. 0.4g N-succinyl chitosan is added in 10mL water, fully stirred to make it dissolve and obtain 4wt% N-succinyl chitosan solution;

[0049] B. Add 0.6g of sodium alginate into 10mL of water, stir well to dissolve it and obtain a 5.7wt% sodium alginate solution;

[0050] C. Add the above-mentioned N-succinyl chitosan solution into the alginic acid solution, and ultrasonically disperse for 15 minutes after magnetic stirring for 2 hours to obtain a sodium alginate / N-succinyl chitosan mixed solution;

[0051] (2) Preparation of uncrosslinked sodium alginate / N-succinyl chitosan composite airgel: Pour the uniform solution of sodium alginate / N-succinyl chitosan obtained in step (1) into a cylindrical mold and put it in a -40°C freezer for more than 4h to freeze the solution, and...

Embodiment 3

[0054] A kind of preparation method of sodium alginate / N-succinyl chitosan composite airgel, concrete steps are as follows:

[0055] (1) prepare sodium alginate / N-succinyl chitosan mixed solution;

[0056] A. 0.1g N-succinyl chitosan is added in 10mL water, after fully stirring to make it dissolve, obtain 1wt% N-succinyl chitosan solution;

[0057] B. Add 0.9g of sodium alginate into 10mL of water, stir well to dissolve it and obtain 8.3wt% sodium alginate solution;

[0058] C. Add the above-mentioned N-succinyl chitosan solution into the alginic acid solution, and ultrasonically disperse for 15 minutes after magnetic stirring for 2 hours to obtain a sodium alginate / N-succinyl chitosan mixed solution;

[0059] (2) Preparation of uncrosslinked sodium alginate / N-succinyl chitosan composite airgel: Pour the uniform solution of sodium alginate / N-succinyl chitosan obtained in step (1) into a cylindrical mold and put it in a -40°C freezer for more than 4 hours to freeze the soluti...

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Abstract

The invention relates to a sodium alginate / N-succinyl chitosan composite aerogel and a preparation method and applications thereof. The composite aerogel is prepared by following steps: mixing a watersolution of N-succinyl chitosan and a water solution of sodium alginate, freezing the mixed solution, moulding, carrying out freeze-drying, and soaking the powder in a calcium-aluminum ion mixed solution to carry out crosslinking, and finally carrying out a post treatment. The provided composite aerogel has excellent surface affinity, a high specific surface area, and excellent mechanical properties, has super affinity with water and oil in the air (the contact angle is 0 degree), has a super oleophobic property in water (the contact angle is 150 degrees), and has high separation efficiency on an oil-water mixture (the oil-water separation efficiency is as high as 99%). The water flux is as high as 2.11 L / (m2.s); the durability of the composite aerogel is high, after the composite aerogelis soaked in seawater for 30 days or more, the composite aerogel can still separate oil and water, and the composite aerogel is suitable for being used as a super oleophobic material underwater.

Description

technical field [0001] The invention belongs to the technical field of biomass functional materials, and in particular relates to a sodium alginate / N-succinyl chitosan composite airgel and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of industry, a large amount of oily wastewater has been produced. For example, oil production wastewater in the petroleum processing industry, cleaning wastewater in the mechanical processing industry, and frequent crude oil spills during oil transportation have resulted in a large amount of oily wastewater entering the environment. The entry of these oily wastewater into the environment will greatly damage the ecological environment and threaten Human health, so the rapid and efficient separation of oil-water mixtures is of great strategic significance for the protection of the ecological environment and the reuse of non-renewable resources. However, traditional separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01D17/022B01D49/00
CPCB01D17/02B01D49/00B01J13/0091
Inventor 樊李红王程曹继龙何广华
Owner WUHAN UNIV OF TECH
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