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Method for preparing carboxylated modified cellulose aerogel under aqueous conditions

A cellulose aerogel, carboxylation technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve problems such as weak metal ion adsorption performance, and achieve the effects of low preparation cost, wide source and strong operability

Inactive Publication Date: 2015-01-28
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the cellulose aerogel obtained by the existing preparation method has weak adsorption performance on metal ions, and provides a method for preparing carboxylated modified cellulose aerogel under aqueous conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing carboxylated modified cellulose airgel under aqueous conditions, specifically carried out according to the following steps:

[0019] 1. Preparation of carboxylated modified cellulose aqueous dispersion: weigh 1g microcrystalline cellulose, 0.15g TEMPO, 1.80g NaClO 2 And 8ml of NaClO solution with a mass fraction of 15% was added to a volume of 160ml of pH6.8 sodium phosphate buffer solution, stirred and reacted at 50°C for 24 hours, added absolute ethanol to terminate the reaction, and the solution was poured into the Erlenmeyer flask Stand in the medium and separate layers, pour off the supernatant, replace with ethanol with a volume concentration of 50%, and then replace with distilled water to obtain a clean, thick gel-like carboxylated modified cellulose dispersion.

[0020] 2. Freezing and drying: at a temperature of -7°C, freeze for 24 hours, freeze the thick gel-like carboxylated modified cellulose dispersion, and then freeze the frozen car...

Embodiment 2

[0022] The method for preparing carboxylated modified cellulose airgel under aqueous conditions is specifically carried out according to the following steps:

[0023] 1. Preparation of carboxylated modified cellulose aqueous dispersion: weigh 1g microcrystalline cellulose, 0.03g TEMPO, 1.08g NaClO by mass 2 Add 4ml of NaClO solution with a mass fraction of 15% into 40ml of pH5.7 sodium phosphate buffer solution, stir and react at 36°C for 24 hours, add absolute ethanol to terminate the reaction, and pour the solution into the Erlenmeyer flask Stand in the medium and separate layers, pour off the supernatant, replace with ethanol with a volume concentration of 50%, and then replace with deionized water to obtain a clean, thick gel-like carboxylated modified cellulose dispersion.

[0024] 2) Freezing and drying: at a temperature of -7°C, freeze for 24 hours, freeze the thick gel-like carboxylated modified cellulose dispersion, and then freeze the frozen carboxylated modified cel...

Embodiment 3

[0026] The method for preparing carboxylated modified cellulose airgel under aqueous conditions is specifically carried out according to the following steps:

[0027] 1. Preparation of carboxylated modified cellulose aqueous dispersion: weigh 1g microcrystalline cellulose, 0.28g TEMPO, 2.53g NaClO by mass 2 Add 16ml of NaClO solution with a mass fraction of 15% into 500ml of pH 8.0 sodium phosphate buffer solution, stir and react at 60°C for 24 hours, add absolute ethanol to terminate the reaction, and pour the solution into the Erlenmeyer flask Stand in the medium for stratification, pour off the supernatant, replace with ethanol with a volume concentration of 50%, and then ultrapure water to obtain a clean, thick gel-like carboxylated modified cellulose dispersion.

[0028] 2. Freezing and drying: at a temperature of -7°C, freeze for 24 hours, freeze the thick gel-like carboxylated modified cellulose dispersion, and then freeze the frozen carboxylated modified cellulose gel ...

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Abstract

The invention discloses a method for preparing carboxylated modified cellulose aerogel under aqueous conditions. The method comprises the following steps: 1 preparing a carboxylated modified cellulose aqueous dispersion, namely adding a microcrystalline cellulose, 2, 2, 6, 6-tetramethyl-piperidine-1-oxygen free radical (TEMPO), NaClO2 and NaClO solution to a sodium phosphate buffer solution, stirring to react for a period of time under certain conditions, adding absolute ethyl alcohol to terminate the reaction, pouring the solution into a conical flask to keep standing and layered, pouring out a supernatant, and then adding 50% ethanol and water to give the clean and thickly gelatinous carboxylated modified cellulose dispersion to replace the supernatant; and 2 carrying out freeze drying to give the carboxylated modified cellulose aerogel. The method disclosed by the invention has the advantages that the obtained carboxylated modified cellulose aerogel has the maximum Ag<+> adsorption capacity of 1.734mmol / g and the maximum Pb2<+> adsorption capacity of 1.696mmol / g.

Description

technical field [0001] The invention relates to the field of airgel preparation, in particular to a method for preparing carboxylated modified cellulose airgel under aqueous conditions. Background technique [0002] Cellulose is the most abundant organic resource on the earth, and it has the characteristics of environmental friendliness such as renewable and easy biodegradability. The development and application of cellulose by human beings is very extensive and has a very long history. Cellulose aerogel, as a new third-generation aerogel, has been a hot spot in scientific research in recent years, and has been reported in many literatures. Cellulose airgel combines the high porosity, high specific surface area, low dielectric constant and low thermal conductivity of silica aerogel and polymer-based aerogel, and at the same time incorporates its own excellent performance. It is a kind of new material with broad application prospect and great development value. [0003] Th...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J9/28C08L1/02C08B15/04B01J20/24B01J20/30
Inventor 桑显葵覃程荣刘新亮魏春蓉黄琳娟
Owner GUANGXI UNIV
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