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Method for preparing regenerated cellulose spherical aerogel modified through carboxylation

A technology of regenerated cellulose and carboxylation, applied in chemical instruments and methods, inorganic chemistry, chemical recovery, etc., can solve the problems of weak adsorption performance of cellulose airgel

Inactive Publication Date: 2014-02-12
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing carboxylated modified regenerated cellulose spherical airgel in order to solve the problem that the cellulose airgel obtained by the existing preparation method has weak adsorption performance

Method used

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  • Method for preparing regenerated cellulose spherical aerogel modified through carboxylation
  • Method for preparing regenerated cellulose spherical aerogel modified through carboxylation
  • Method for preparing regenerated cellulose spherical aerogel modified through carboxylation

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specific Embodiment approach 1

[0024] Specific embodiment one: the preparation method of carboxylated modified regenerated cellulose spherical airgel in this embodiment is implemented according to the following steps:

[0025] 1. According to the mass ratio (6~7): (10~12): (70~81), mix sodium hydroxide, urea and deionized water, add cellulose raw materials at a temperature of -15~-12°C, After stirring and dissolving, the insoluble precipitate was removed by centrifugation to obtain a cellulose solution, and then the cellulose solution was added dropwise to the regeneration solution with a dropper, and the spherical hydrogel was collected after solidifying in the regeneration solution for 5 to 15 minutes. Washing with deionized water for 3 to 5 times and soaking in deionized water to obtain regenerated cellulose spherical hydrogel for use;

[0026] 2. Dissolve 1~1.5mg TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) and 10~15mg sodium bromide into 30~50mL deionized water, add 10~20g step 1 The obtained regenera...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment differs from Embodiment 1 in that step 1 mixes sodium hydroxide, urea and deionized water in a mass ratio of 7:12:81. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the cellulose raw material in step 1 is bamboo fiber, and the cellulose mass fraction of bamboo fiber is 98%. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for preparing regenerated cellulose spherical aerogel modified through carboxylation, which aims at the problem of poor adsorptive property of the cellulose aerogel prepared by the existing methods. The method comprises steps of firstly, mixing sodium hydroxide, urea and deionized water, then adding into a cellulose raw material, preparing a cellulose solution, adding the cellulose solution into a regeneration solution for solidifying, washing and obtaining spherical hydrogel; and secondly, dissolving TEMPO (tetramethyl-piperidin-1-oxyl) and sodium bromide into deionized water, adding the spherical hydrogel, then adding a sodium hypochlorite solution, regulating pH value of a system through a sodium hydroxide solution, steeping, exchanging the collected solid phase objects sequentially through absolute ethyl alcohol and a tertiary butanol solvent, then cooling, finally, freeze drying so as to finish preparing the cellulose spherical aerogel. The largest capacity of the obtained spherical aerogel in adsorbing metal ions Cu<2+> reaches 0.55m mol / g, and the adsorptive property is good.

Description

technical field [0001] The invention relates to a preparation method of cellulose airgel. Background technique [0002] Airgel is a porous material in which the liquid solvent in the gel material is replaced by air without significantly changing its own network structure. In the 1930s, Kistler first synthesized SiO 2 Airgel, and then various airgel materials are gradually synthesized, such as alumina, rubber, cellulose derivatives, etc. Airgel has a unique porous structure, such as ultra-low density, high specific surface area, unique optical and acoustic properties, low dielectric constant, and extremely low thermal conductivity. Cellulose is a kind of abundant and renewable natural polymer compound, which has good biocompatibility and structural stability. Therefore, airgel materials prepared from cellulose are rich in the common characteristics of the two, and it is very feasible and practical to increase the functionality of cellulose airgel through cellulose modifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J7/12C08J3/075C08L1/02B01J20/24B01J20/28B01J20/30
CPCY02P20/584
Inventor 刘志明吴鹏李坚
Owner NORTHEAST FORESTRY UNIVERSITY
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