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Nano cellulose cross-linked graphene/chitosan aerogel as well as preparation method and application thereof

A nanocellulose and chitosan technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve the problems of reducing the adsorption effect of adsorbent materials, graphene oxide nano-toxicity, poor adsorption effect, etc. Achieve good adsorption effect, excellent adsorption performance and fast adsorption process

Active Publication Date: 2019-01-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The airgel can be used to remove organic dye molecules or other impurities in sewage to achieve sewage purification, but the airgel can only rely on the hydroxyl and carboxyl groups on the graphene molecular chain and the oxygen-containing groups on the cellulose chain There is no chemical bond cross-linking between graphene oxide and the polymer matrix, so the stability is low, and it is easy to migrate from the adsorbent system to water during the adsorption swelling process. In the system, it not only reduces the adsorption effect of the adsorption material, but also causes the nano-toxicity of graphene oxide.

Method used

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  • Nano cellulose cross-linked graphene/chitosan aerogel as well as preparation method and application thereof
  • Nano cellulose cross-linked graphene/chitosan aerogel as well as preparation method and application thereof
  • Nano cellulose cross-linked graphene/chitosan aerogel as well as preparation method and application thereof

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Embodiment 1

[0035] The nanocellulose crosslinked graphene / chitosan airgel of the present embodiment is made by mixing and crosslinking dialdehyde nanocellulose, amine-modified graphene oxide and chitosan; the amino-modified graphene oxide is Polyethyleneimine modified graphene oxide; the mass ratio of dialdehyde nanocellulose, amine-modified graphene oxide and chitosan is 3:1:3.

[0036] The preparation method of the nanocellulose cross-linked graphene / chitosan airgel of the present embodiment may further comprise the steps:

[0037] 1) Dissolve 1.2g of sodium periodate in 20mL of distilled water, add 1M sulfuric acid to adjust the pH to 4, then add 0.6g of nanocellulose and react in the dark at 40°C for 4 hours, filter and wash to remove unreacted periodate Sodium, obtain dialdehyde nanocellulose;

[0038] 2) Mix 1 g of polyethyleneimine with 0.2 g of graphene oxide, heat and react at 90° C. for 4 hours, and filter through a membrane to remove unreacted polyethyleneimine to obtain polye...

Embodiment 2

[0047] The nanocellulose cross-linked graphene / chitosan airgel of this embodiment is made by mixing and cross-linking dialdehyde nanocellulose, amine-modified graphene oxide and chitosan; amine-modified graphene oxide It is polyethyleneimine modified graphene oxide; the mass ratio of dialdehyde nanocellulose, amine-modified graphene oxide and chitosan is 2:1:3.

[0048] The preparation method of the nanocellulose cross-linked graphene / chitosan airgel of the present embodiment may further comprise the steps:

[0049] 1) Dissolve 1.0g of sodium periodate in 20mL of distilled water, add 1M sulfuric acid to adjust the pH to 4, then add 0.6g of nanocellulose and react in the dark at 40°C for 6 hours, filter and wash to remove unreacted periodate Sodium, obtain dialdehyde nanocellulose;

[0050] 2) Mix 1 g of polyethyleneimine with 0.3 g of graphene oxide, heat and react at 90° C. for 4 hours, and filter through a membrane to remove unreacted polyethyleneimine to obtain polyethylen...

Embodiment 3

[0058] The nanocellulose cross-linked graphene / chitosan airgel of this embodiment is made by mixing and cross-linking dialdehyde nanocellulose, amine-modified graphene oxide and chitosan; amine-modified graphene oxide It is polyethyleneimine modified graphene oxide; the mass ratio of dialdehyde nanocellulose, amine-modified graphene oxide and chitosan is 1:2:3.

[0059] The preparation method of the nanocellulose cross-linked graphene / chitosan airgel of the present embodiment may further comprise the steps:

[0060] 1) Dissolve 1.0g of sodium periodate in 20mL of distilled water, add 1M sulfuric acid to adjust the pH to 4, then add 0.5g of nanocellulose and react in the dark at 40°C for 8 hours, filter and wash to remove unreacted periodate Sodium, obtain dialdehyde nanocellulose;

[0061] 2) Mix 4 g of polyethyleneimine with 1 g of graphene oxide, heat and react at 90° C. for 4 hours, and filter through a membrane to remove unreacted polyethyleneimine to obtain polyethylenei...

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Abstract

The invention relates to a nano cellulose cross-linked graphene / chitosan aerogel as well as a preparation method and application thereof, belonging to the field of dye adsorption of aerogel. The nanocellulose cross-linked graphene / chitosan aerogel is prepared by mixing and cross linking dialdehyde nano cellulose, amido modified oxidized graphene and chitosan. The nano cellulose cross-linked graphene / chitosan aerogel not only has excellent adsorption property of graphene and chitosan but also avoids use of a toxic cross linking agent, and meanwhile exerts the advantage of large specific surface area of nano cellulose, easily separates from water body, does not generate secondary pollution, and is an environmental-friendly novel adsorption material. Measurement on adsorption property of organic dye shows that the nano cellulose cross-linked graphene / chitosan aerogel has good adsorption effect on congo red and amino black, has more than 92% of removal rate, and is quick in adsorption process, is easily separated after adsorption, and has good application prospect.

Description

technical field [0001] The invention relates to a nano-cellulose cross-linked graphene / chitosan airgel and a preparation method and application thereof, belonging to the field of dye adsorption of airgel. Background technique [0002] With the rapid development of the domestic printing and dyeing industry, a large amount of sewage containing dyes is discharged into the water environment, causing water pollution and seriously threatening the water safety of our country. There are many methods of water treatment, and the adsorption method is a simple and efficient method. Due to its high specific surface area and ultra-high pore volume ratio, airgel is often used as adsorption for sewage treatment. [0003] In the prior art, the Chinese invention patent with the authorized announcement number CN105566659B discloses a graphene oxide / nanocellulose airgel, which uses nanocellulose and graphene oxide as raw materials to prepare water by hydrothermal reaction. The gel was further ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30C02F103/30
CPCB01J20/24B01J20/28047C02F1/286C02F2101/308C02F2103/30
Inventor 刘翠云刘红宇李添锦冯树文李远航丁翰林建方方
Owner HENAN UNIV OF SCI & TECH
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