Preparation method of nano-crystalline cellulose-based composite aerogel type organic dye absorption material

A technology of nanocellulose and composite airgel, applied in chemical instruments and methods, colloid chemistry, colloid chemistry, etc., can solve the problems of water-soluble dye adsorption performance and selectivity to be further improved, easy swelling, loss of mechanical properties, etc.

Active Publication Date: 2015-12-16
ZHEJIANG FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, almost all the existing reports use pure nano-cellulose airgel as the dye adsorption material. Although it has a certain adsorption effect, it is easy to swell in water, resulting in the loss of its mechanical properties, and the adsorption performance and selection of water-soluble dyes Sex still needs to be further improved

Method used

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  • Preparation method of nano-crystalline cellulose-based composite aerogel type organic dye absorption material
  • Preparation method of nano-crystalline cellulose-based composite aerogel type organic dye absorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Cationic nanocellulose and chitosan 1:1 (w / w) composite airgel was prepared as follows:

[0020] Disperse 1g of bamboo pulp in 5% NaOH solution, add 2.9g of 2,3-epoxypropyltrimethylammonium chloride and stir at 25°C to make it evenly mixed, then react at 65°C for 6h. After the reaction is completed, adjust the pH to 7 with dilute hydrochloric acid, filter with suction, wash with a large amount of distilled water until neutral, and finally polish the fiber suspension through a high-pressure homogenizer to obtain a positively charged NFC dispersion on the surface;

[0021] The mixture of cationic nanocellulose and chitosan (solid mass ratio = 1:1 (w / w)) was placed at -60°C for 4 hours and then freeze-dried, then soaked in 0.5% epichlorohydrin (cross-linked agent) in a 2wt% sodium hydroxide solution at 40° C. for 2 hours, then freeze-dry again. Its performance is shown in Table 1 and figure 1 .

Embodiment 2

[0023] Cationic nanocellulose and chitosan 2:1 (w / w) composite aerogels were prepared as follows:

[0024] Disperse 1g of bamboo pulp in 5% NaOH solution, add 2.9g of 2,3-epoxypropyltrimethylammonium chloride and stir at 25°C to make it evenly mixed, then react at 65°C for 6h. After the reaction is completed, adjust the pH to 7 with dilute hydrochloric acid, filter with suction, wash with a large amount of distilled water until neutral, and finally polish the fiber suspension through a high-pressure homogenizer to obtain a positively charged NFC dispersion on the surface;

[0025] The mixture of cationic nanocellulose and chitosan (solid mass ratio = 2:1 (w / w)) was placed at -60°C for 4 hours and then freeze-dried, then soaked in 0.5% epichlorohydrin (cross-linked agent) in a 2wt% sodium hydroxide solution at 40° C. for 2 hours, then freeze-dry again. Its performance is shown in Table 1 and figure 1 .

Embodiment 3

[0027] Low-charge cationic nanocellulose was prepared as follows:

[0028] Disperse 1g of bamboo pulp in 5% NaOH solution, add 2.9g of 2,3-epoxypropyltrimethylammonium chloride and stir at 25°C to make it evenly mixed, then react at 65°C for 6h. After the reaction, adjust the pH to 7 with dilute hydrochloric acid, filter with suction, wash with a large amount of distilled water until neutral, and finally polish the fiber suspension with a high-pressure homogenizer to obtain a positively charged NFC dispersion on the surface.

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Abstract

The invention discloses a preparation method of a nano-crystalline cellulose-based composite aerogel type organic dye absorption material. The method comprises the following steps: preparing nanofibers having functional surfaces by combining a chemical pretreatment method and a mechanical treatment method; and mixing the nanofibers and a natural absorption material to prepare composite aerogel which is used as the organic dye absorption material, wherein the porosity of the prepared composite aerogel is up to 99% or more, the decolourization ratio of the prepared material on organic dyes can exceed 90%, and the prepared material can be widely applied to absorbing the various water-soluble organic dyes.

Description

technical field [0001] The invention relates to a preparation method of an organic dye adsorption material, in particular to a preparation method of a nanocellulose-based composite airgel. Background technique [0002] my country is a big country in textile production and processing, and its textile and clothing exports have ranked first in the world for many years. While the rapid development of textile exports is promoting the vigorous development of my country's printing and dyeing industry, it has caused the discharge of dye wastewater to increase year by year. [0003] Due to the characteristics of high chroma, high alkalinity, complex composition, and poor biochemical properties, dye wastewater is one of the more difficult industrial wastewater to treat. At present, the physical and chemical methods commonly used in the industrial treatment of dye wastewater include chemical flocculation, electrolysis, membrane separation, oxidation, etc. However, these methods gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01J13/00
Inventor 刘宏治陈宇飞赵志航豆朝威
Owner ZHEJIANG FORESTRY UNIVERSITY
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