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A kind of sodium alginate/n-succinyl chitosan composite airgel and its preparation method and application

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: 2020-12-29
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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  • A kind of sodium alginate/n-succinyl chitosan composite airgel and its preparation method and application
  • A kind of sodium alginate/n-succinyl chitosan composite airgel and its preparation method and application
  • A kind of sodium alginate/n-succinyl chitosan composite airgel and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0031]A preparation method of sodium alginate / N-succinyl chitosan composite aerogel, the specific steps are as follows:

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

[0033]A. Add 0.2g of N-succinyl chitosan to 10 mL of water, stir thoroughly to dissolve and obtain a 2wt% N-succinyl chitosan solution;

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

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

[0036](2) Preparation of uncrosslinked sodium alginate / N-succinyl chitosan composite aerogel: pour the sodium alginate / N-succinyl chitosan uniform solution obtained in step (1) into a height of 2 cm 、In a cylindrical mold with a diameter of 6 cm, and put it in the freezer at -40℃ for 4h to freeze the solution into sha...

Embodiment 2

[0046]A preparation method of sodium alginate / N-succinyl chitosan composite aerogel, the specific steps are as follows:

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

[0048]A. Add 0.4g of N-succinyl chitosan to 10 mL of water, stir thoroughly to dissolve it to obtain a 4wt% N-succinyl chitosan solution;

[0049]B. Add 0.6g of sodium alginate to 10mL of water, fully stir to dissolve it to obtain a 5.7% by weight sodium alginate solution;

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

[0051](2) Preparation of uncrosslinked sodium alginate / N-succinyl chitosan composite aerogel: pour the uniform sodium alginate / N-succinyl chitosan solution obtained in step (1) into a cylindrical mold And put it in the freezer at -40℃ for more than 4h to freeze the solution, and then freeze-dry it ...

Embodiment 3

[0054]A preparation method of sodium alginate / N-succinyl chitosan composite aerogel, the specific steps are as follows:

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

[0056]A. Add 0.1g of N-succinyl chitosan into 10 mL of water, stir thoroughly to dissolve it to obtain a 1wt% N-succinyl chitosan solution;

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

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

[0059](2) Preparation of uncrosslinked sodium alginate / N-succinyl chitosan composite aerogel: pour the uniform sodium alginate / N-succinyl chitosan solution obtained in step (1) into a cylindrical mold And put it in the freezer at -40℃ for more than 4h to freeze the solution into shape, then freeze-dry i...

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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 specifically relates to a sodium alginate / N-succinyl chitosan composite aerogel, 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 from the mechanical processing industry, and frequent crude oil leakage incidents during oil transportation have caused a large amount of oily wastewater to enter the environment. The entry of oily wastewater into the environment will greatly damage the ecological environment and threaten the environment. Human health, so the rapid and efficient separation of oil-water mixtures is of great strategic significance whether it is for the protection of the ecological environment or for the reuse of renewable resources. However, tr...

Claims

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Application Information

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Patent Type & Authority Patents(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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