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Preparation of nano-crystalline cellulose aerogel material with high strength and high adsorption performance

A nanocellulose and aerogel technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of cumbersome and toxic operations, protect the environment, improve adsorption performance, The effect of the simple preparation process

Inactive Publication Date: 2020-12-25
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of nanocellulose-based composite airgel materials by chemical cross-linking usually requires the use of a large amount of organic solvents, which has the problems of toxicity and cumbersome operation.

Method used

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  • Preparation of nano-crystalline cellulose aerogel material with high strength and high adsorption performance
  • Preparation of nano-crystalline cellulose aerogel material with high strength and high adsorption performance
  • Preparation of nano-crystalline cellulose aerogel material with high strength and high adsorption performance

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Experimental program
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Effect test

Embodiment 1

[0022] The nanocellulose hydrogel material was prepared by calcium ion cross-linking method, soaked in 3 mg / mL dopamine solution, and fully soaked for 12 hours. After being taken out, ammonia water and ethanol are added to make the dopamine grow on the nano-cellulose in situ to obtain a polydopamine-modified nano-cellulose hydrogel material. Soak the polydopamine-modified nanocellulose hydrogel material in a 0.1 mmol / L silver nitrate solution and react for 1 h. The hydrogel material was freeze-dried to obtain the airgel material (attached figure 1 ). Carry out intensity measurement, then use airgel material to adsorb methylene blue (200mg / L), and measure the adsorption amount after 6 hours. Then, catalytic degradation was carried out in a solution of sodium borohydride, wherein the concentration of sodium borohydride was 0.2mmol / L, and the irradiation power of near-infrared light was 2W. Finally, the adsorbent material is recycled.

[0023] The amount of dye adsorption was...

Embodiment 2

[0027] The nanocellulose hydrogel material was prepared by calcium ion cross-linking method, which was soaked in a solution of 4 mg / mL dopamine for 24 hours. After being taken out, ammonia water and ethanol are added to make the dopamine grow on the nano-cellulose in situ to obtain a polydopamine-modified nano-cellulose hydrogel material. Soak the polydopamine-modified nanocellulose hydrogel material in a 0.1 mmol / L silver nitrate solution and react for 1 h. The hydrogel material is freeze-dried to obtain an airgel material, and the SEM image of the airgel material is as follows figure 2 shown. Intensity measurement was carried out, and then the airgel material was used to adsorb methyl orange (200 mg / L), and the adsorption amount was measured after 6 hours. Then, catalytic degradation was carried out in a solution of sodium borohydride, wherein the concentration of sodium borohydride was 0.2mmol / L, and the irradiation power of near-infrared light was 4W. Finally, the adso...

Embodiment 3

[0032] The nanocellulose hydrogel material was prepared by calcium ion cross-linking method, soaked in a 3 mg / mL dopamine solution, and fully soaked for 48 hours. After being taken out, ammonia water and ethanol are added to make the dopamine grow on the nano-cellulose in situ to obtain a polydopamine-modified nano-cellulose hydrogel material. Soak the polydopamine-modified nanocellulose hydrogel material in a 0.1 mmol / L silver nitrate solution and react for 1 h. The hydrogel material is freeze-dried to obtain an airgel material. Carry out intensity measurement, then use airgel material to adsorb Congo red (200mg / L), and measure the adsorption amount after 6 hours. Then, catalytic degradation was carried out in a solution of sodium borohydride, wherein the concentration of sodium borohydride was 0.2mmol / L, and the irradiation power of near-infrared light was 6W. Finally, the adsorbent material is recycled.

[0033] The amount of dye adsorption was calculated according to th...

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Abstract

The invention discloses preparation of a nanocellulose aerogel material with high strength and high adsorption performance, and belongs to the technical field of adsorption materials. According to theinvention, firstly, polydopamine is adopted to grow on nano-crystalline cellulose hydrogel in a guided mode; and then, dipping into a silver nitrate solution is carried out, silver nanoparticles aregenerated on the nano-crystalline cellulose hydrogel, and freeze-drying is carried out to obtain the aerogel material. The preparation method has the characteristics of simple preparation process andmild reaction. Besides, the aerogel material disclosed by the invention has relatively good strength and relatively high adsorption capacity on dyes and the like, and can realize degradation of the dyes and recycling of the adsorption material.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to the preparation of a nano-cellulose airgel material with high strength and high adsorption performance. Background technique [0002] The continuous development of industrialization has promoted the progress of society, but it has also brought a series of problems to human beings, such as resource depletion and environmental degradation. Among them, water pollution and air pollution are the most serious problems, seriously threatening human life and health, and becoming bottlenecks that plague social development. In addition, dyes in wastewater are difficult to biodegrade, have complex components, high organic content, and high biological toxicity, which is the most serious water pollution. Adsorption is a simple and effective method for treating dye wastewater. Studies have found that using adsorption materials to separate and fix dye pollutants, and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08L79/04C08K3/08B01J31/06B01J20/24B01J20/28B01J20/30
CPCC08J9/28B01J31/06B01J20/24B01J20/28047B01J20/30C08J2301/02C08J2479/04C08J2201/0484C08K2003/0806C08K2201/011B01J35/23
Inventor 刘洪斌霍盈刘莹莹
Owner TIANJIN UNIV OF SCI & TECH
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