Cellulose nanofiber hydrogel and preparation method thereof

A nanofiber and cellulose technology, applied in fiber treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high cost, limited adsorption performance of visible light catalyst, complicated operation, etc., and achieve low cost, easy promotion, The effect of simple conditions

Active Publication Date: 2019-03-12
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this invention is that the operation is complicated, the cost is high, and the obtained cellulose-based macroporous gel composite cuprous oxide visible light catalyst has limited adsorption performance.

Method used

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  • Cellulose nanofiber hydrogel and preparation method thereof
  • Cellulose nanofiber hydrogel and preparation method thereof
  • Cellulose nanofiber hydrogel and preparation method thereof

Examples

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preparation example Construction

[0040] The present invention also proposes a preparation method of cellulose nanofiber hydrogel, combining figure 1 The schematic flow chart of the preparation method of the shown cellulose nanofiber hydrogel, the preparation method of the cellulose nanofiber hydrogel comprises the following steps:

[0041] S40, placing the cellulose nanofibers in deionized water, and dispersing them into a suspension.

[0042] S50, adding an initiator to the suspension, stirring and mixing, sequentially adding monomer a, monomer b and N,N-methylenebisacrylamide to undergo a polymerization reaction to prepare a cellulose nanofiber hydrogel.

[0043]Wherein, monomer a is at least one of acrylic acid and its alkali metal salts, ammonium salts and organic amine salts, and methacrylic acid and its alkali metal salts, ammonium salts and organic amine salts;

[0044] Monomer b is one or both of acrylamide and methacrylamide.

[0045] Wherein, the initiator is persulfate or peroxide, and the added ...

Embodiment 1

[0064] First weigh 0.8g of cellulose acetate powder in 5ml of acetone-dimethylacetamide (2:1, v:v) mixed solvent, stir magnetically in a screw-top vial for 1.5h until dissolved, and prepare after standing still for defoaming Form a uniform spinning stock solution; put the stock solution into a 5ml medical syringe tube (the diameter of the injection needle is 0.6mm), and use electrospinning technology at a working voltage of 20KV, a solution flow rate of 1ml / h, and a distance from the needle tip to the drum of 15cm Spinning under certain conditions to prepare cellulose acetate nanofibers; immerse cellulose acetate nanofibers in sodium hydroxide ethanol solution for 24 hours to promote in-situ hydrolysis and reduction of cellulose acetate components in nanofibers to cellulose. After the reaction After washing with alcohol, washing with water and drying, the cellulose nanofibers are obtained. Weigh 1 g of cellulose nanofibers and place them in deionized water, fully swell and dis...

Embodiment 2

[0070] First weigh 0.8g of cellulose acetate powder in 5ml of acetone-dimethylacetamide (2:1, v:v) mixed solvent, stir magnetically in a screw-top vial for 1.5h until dissolved, and prepare after standing still for defoaming Form a uniform spinning stock solution; put the stock solution into a 5ml medical syringe tube (the diameter of the injection needle is 0.6mm), and use electrospinning technology at a working voltage of 20KV, a solution flow rate of 1ml / h, and a distance from the needle tip to the drum of 15cm Spinning under certain conditions to prepare cellulose acetate nanofibers; immerse cellulose acetate nanofibers in sodium hydroxide ethanol solution for 24 hours to promote in-situ hydrolysis and reduction of cellulose acetate components in nanofibers to cellulose. After the reaction After washing with alcohol, washing with water and drying, the cellulose nanofibers are obtained. Weigh 1 g of cellulose nanofibers and place them in deionized water, fully swell and dis...

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Abstract

The invention discloses a cellulose nanofiber hydrogel and a preparation method thereof and relates to the technical field of sewage treatment. The preparation method of the cellulose nanofiber hydrogel comprises dispersing cellulose nanofiber into deionized water into a suspension; uniformly mixing initiator into the suspension, and then sequentially adding in a monomer a, a monomer b and N, N-methylene bisacrylamide for polymerization to obtain the cellulose nanofiber hydrogel, wherein the monomer a is at least one selected from acrylic acid, alkali metal acrylate, ammonium acrylate, organicamine acrylate, methacrylic acid, alkali metal methacrylate, ammonium methacrylate and organic amine acrylate, and the monomer b is one or two selected from acrylamide and methacrylamide. The preparation method of the cellulose nanofiber hydrogel is simple in required conditions, low in cost and convenient to generalize; the prepared cellulose nanofiber hydrogel has the advantages of being largein specific surface area and large in quantity of active sites, and when serving as a sewage absorbent, achieves efficient absorptive properties.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a cellulose nanofiber hydrogel and a preparation method thereof. Background technique [0002] Water is an indispensable element in modern industrial and agricultural production and food processing, and for some traditional agricultural product processing and aquatic product manufacturing enterprises, the amount of water is even greater. With the use and consumption of water resources, a large amount of waste enters the water body and causes pollution, causing serious negative effects on the ecological environment. Among them, the colored sewage formed by small organic molecules is difficult to degrade naturally (such as anti-photolysis and anti-oxidation), and the water body has deep color and high biological toxicity, which has brought great harm to human society and nature. Therefore, the research on water treatment technology and water circulation technology of colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M14/04C02F1/28
CPCC02F1/286D06M14/04
Inventor 蔡杰
Owner WUHAN POLYTECHNIC UNIVERSITY
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