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Preparation method for cellulose-based composite aerogel with high adsorption performance

A composite airgel and cellulose-based technology, applied in the field of environmental governance, can solve the complex production of activated carbon and other problems, and achieve the effect of simple preparation method, international competitiveness and mild reaction

Inactive Publication Date: 2017-09-15
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of activated carbon is relatively complicated, which involves carbonization and activation stages. Although its water treatment effect is very good, the high production cost prevents activated carbon from being used as an adsorbent for large-scale water treatment in poor or developing countries. Therefore, it is cheap , high-efficiency adsorbents have become the focus of people's research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare 5ml of 60wt% lithium bromide aqueous solution (LiBr), add 50mg of dopamine powder into the lithium bromide aqueous solution, the temperature is 20-25°C, the stirring time is about 10min, accompanied by 50-100r / min stirring. This ensures that the dopamine is completely dissolved. Then add 75 mg of microcrystalline cellulose powder and dissolve in an oil bath at 120°C under stirring conditions for 40 minutes with stirring at 50-100 r / min. At the same time, dopamine is self-polymerized at high temperature to form polydopamine; when the cellulose is completely dissolved, the polydopamine / cellulose solution is slowly cooled at room temperature until a gel is formed, and then deionized is added to the polydopamine / cellulose gel. The water is continuously exchanged with deionized water until lithium bromide is completely removed, and the obtained polydopamine / cellulose hydrogel is freeze-dried to obtain a polydopamine / cellulose-based composite airgel.

[0023] Wherein...

Embodiment 2

[0025] Prepare 5ml of 60wt% lithium bromide aqueous solution (LiBr), add 75mg of dopamine powder in the lithium bromide aqueous solution, dissolve dopamine under the condition of stirring, then add 75mg of microcrystalline cellulose powder, place under stirring condition 120 ℃ oil Dissolve in the bath, while dopamine is self-polymerized at high temperature to form polydopamine; when the cellulose is completely dissolved, the polydopamine / cellulose solution is placed at room temperature and slowly cooled until a gel is formed, and then the polydopamine / cellulose gel Add deionized water to the mixture, and exchange the deionized water continuously until the LiBr is completely removed, and the obtained polydopamine / cellulose hydrogel is freeze-dried to obtain a polydopamine / cellulose-based composite airgel.

Embodiment 3

[0027] Prepare 5ml of 60wt% lithium bromide aqueous solution (LiBr), add 100mg of dopamine powder in the aqueous solution of LiBr, dissolve dopamine under the condition of stirring, then add 75mg of microcrystalline cellulose powder, place under stirring condition 120 ℃ oil Dissolve in the bath, while dopamine is self-polymerized at high temperature to form polydopamine; when the cellulose is completely dissolved, the polydopamine / cellulose solution is placed at room temperature and slowly cooled until a gel is formed, and then the polydopamine / cellulose gel Add deionized water to the mixture, and exchange the deionized water continuously until the LiBr is completely removed, and the obtained polydopamine / cellulose hydrogel is freeze-dried to obtain a polydopamine / cellulose-based composite airgel.

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Abstract

The invention discloses a preparation method for a cellulose-based composite aerogel with high adsorption performance. The preparation method comprises the following steps: dissolving dopamine powder in an aqueous lithium bromide solution with a concentration of 50 to 80%; then adding microcrystalline cellulose powder, wherein a weight ratio of dopamine to microcrystalline cellulose is 1: 0.75 to 1: 1.5; placing the obtained mixture in an oil bath with a temperature of 120 DEG C, dissolving microcrystalline cellulose for 40 min or so under stirring at a speed of 50 to 100 r / min and allow dopamine to undergo auto-polymerization so as to form polydopamine; and slowly cooling a solution obtained in the previous step at room temperature and then carrying out freeze drying so as to form the polydopamine / cellulose-based composite aerogel. The composite aerogel provided by the invention has excellent performance in adsorption of the positive dye methylene blue, and the preparation method is simple in process.

Description

technical field [0001] The invention relates to the field of environmental governance, and more specifically, relates to a preparation method of an adsorbent with high adsorption performance. Background technique [0002] In recent decades, the acceleration of industrialization and the rapid increase of population have caused serious environmental pollution. Among them, water pollution is particularly serious. A large amount of toxic heavy metal ions, inorganic anions, and organic micro-pollutants, such as dyes, phenols, pesticides, humic acid organic compounds, detergents, and other persistent organic pollutants, have been released in recent decades. Widely reported around the world. The discharge of these toxic pollutants into water bodies greatly affects the ecological balance and has adverse effects on animals and plants. In addition, these pollutants are not only resistant to chemical and biological degradation, but also have great environmental mobility, and have a s...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/26B01J20/28047C02F1/285C02F2101/308
Inventor 王勇韦枭杨静晖黄婷张楠
Owner SOUTHWEST JIAOTONG UNIV
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