Preparation method of nanocellulose-based composite aerogel-type organic dye adsorption material

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

Active Publication Date: 2018-05-29
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 nanocellulose-based composite aerogel-type organic dye adsorption material
  • Preparation method of nanocellulose-based composite aerogel-type organic dye adsorption material

Examples

Experimental program
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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 nanocellulose-based composite airgel-type organic dye adsorption material, which prepares a surface-functionalized nanofiber by combining chemical pretreatment and mechanical treatment, and combines the nanofiber with the Natural adsorption materials are mixed to prepare composite airgel as an organic dye adsorption material. The prepared composite airgel has a porosity of more than 99% and a decolorization rate of more than 90% for organic dyes. It can be widely used to adsorb various water-soluble organic dyes. dye.

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 Patents(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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