A kind of nano-cellulose cross-linked graphene/chitosan airgel and its preparation method and application
A technology of nanocellulose and chitosan, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve the problems of reducing the adsorption effect of adsorption materials, low stability, and graphene oxide nano-toxicity, etc. Achieve good adsorption effect and broad application prospects
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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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