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Preparation method of porous aerogel composite material and porous aerogel composite material

A porous airgel and composite material technology, applied in the field of composite material preparation, can solve problems such as the need to increase the saturated adsorption capacity, difficult penetration of heavy metal ions, lack of structural stability, etc., to achieve improved adsorption effect, improved adsorption effect, excellent mechanical properties performance effect

Pending Publication Date: 2020-08-07
HAITAI TEXTILE SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the current graphene oxide-based porous airgel adsorbent materials, such as the saturated adsorption capacity needs to be improved, and the structural stability is lacking.
This is mainly due to the fact that although graphene oxide has an ultra-high specific surface area, there are few active groups that can effectively adsorb heavy metal ions.
Moreover, although the internal voids of porous airgel increase its specific surface area, the tortuous voids and air pressure make it difficult for heavy metal ions to penetrate into the interior of the airgel.

Method used

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  • Preparation method of porous aerogel composite material and porous aerogel composite material
  • Preparation method of porous aerogel composite material and porous aerogel composite material
  • Preparation method of porous aerogel composite material and porous aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S1. React graphene oxide with a modification aid to obtain pre-modified graphene oxide. Step S1 is specifically:

[0041] Prepare 200ml of graphene oxide aqueous solution with a concentration of 5g / L, and adjust the pH value of the solution to 9.5 with 1% NaOH, and add 20g of epichlorohydrin drop by drop under magnetic stirring in a water bath at 60°C. Stirring was continued for 3 hours, and then the product was centrifuged and washed with deionized water to obtain pre-modified graphene oxide.

[0042] S2. Grafting cyclodextrin onto pre-modified graphene oxide to obtain cyclodextrin-modified graphene oxide. Step S2 is specifically:

[0043] Disperse the pre-modified graphene oxide obtained in step S1 in 200mL of carbonate buffer, then add 15g of β-cyclodextrin, stir magnetically for 3 hours in a water bath at 60°C, and then centrifuge the product with deionized water Washing 3 times to obtain β-cyclodextrin modified graphene oxide. In other embodiments, the cyclodextr...

Embodiment 2

[0050] S1. React graphene oxide with a modification aid to obtain pre-modified graphene oxide. Step S1 is specifically:

[0051] Prepare 200ml of graphene oxide aqueous solution with a concentration of 5g / L, and adjust the pH value of the solution to 9.5 with 1% NaOH, and add 20g of epichlorohydrin drop by drop under magnetic stirring in a water bath at 60°C. Stirring was continued for 3 hours, and then the product was centrifuged and washed with deionized water to obtain pre-modified graphene oxide.

[0052] S2. Grafting cyclodextrin onto pre-modified graphene oxide to obtain cyclodextrin-modified graphene oxide. Step S2 is specifically:

[0053] Disperse the pre-modified graphene oxide obtained in step S1 in 200mL of carbonate buffer, then add 15g of β-cyclodextrin, stir it magnetically for 3 hours in a water bath at 60°C, and then centrifuge the product with deionized water Washing 3 times to obtain β-cyclodextrin modified graphene oxide.

[0054] S3, mixing the anion-m...

Embodiment 3

[0059] S1. React graphene oxide with a modification aid to obtain pre-modified graphene oxide. Step S1 is specifically:

[0060] Prepare 200ml of graphene oxide aqueous solution with a concentration of 5g / L, and adjust the pH value of the solution to 9.5 with 1% NaOH, and add 20g of epichlorohydrin drop by drop under magnetic stirring in a water bath at 60°C. Stirring was continued for 3 hours, and then the product was centrifuged and washed with deionized water to obtain pre-modified graphene oxide.

[0061] S2. Grafting cyclodextrin onto pre-modified graphene oxide to obtain cyclodextrin-modified graphene oxide. Step S2 is specifically:

[0062] Disperse the pre-modified graphene oxide obtained in step S1 in 200mL of carbonate buffer, then add 15g of β-cyclodextrin, stir it magnetically for 3 hours in a water bath at 60°C, and then centrifuge the product with deionized water Washing 3 times to obtain β-cyclodextrin modified graphene oxide.

[0063] S3, mixing the anion-m...

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Abstract

The invention provides a preparation method of a porous aerogel composite material and the porous aerogel composite material, and the preparation method comprises the following steps: reacting graphene oxide with a modification auxiliary agent to obtain pre-modified graphene oxide; grafting cyclodextrin onto the pre-modified graphene oxide to obtain cyclodextrin modified graphene oxide; mixing theanion modified hyperbranched polymer / cyclodextrin modified graphene oxide with sodium alginate to obtain sol; and carrying out cross-linking curing reaction on the sol and calcium ions to obtain gel,and carrying out freeze drying treatment on the gel to obtain the porous aerogel composite material. The porous adsorption material prepared by the invention has good mechanical properties, can realize induced transfer and adsorption of heavy metal ions through a hyperbranched polymer of polyanions, and realizes efficient adsorption and cyclic utilization of the heavy metal ions through a high adsorption surface and adsorption groups provided by the two-dimensional modified graphene oxide sheet.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a method for preparing a porous airgel composite material and the porous airgel composite material thereof, in particular to a method for preparing a porous airgel composite material for absorbing heavy metal ions and Its porous airgel composites. Background technique [0002] Water resources are the source of human life and the basic guarantee for the survival and development of human society. However, with the rapid development of industry, the problem of water pollution is becoming more and more serious. Industrial wastewater can be divided into organic wastewater, inorganic wastewater, toxic chemical wastewater, industrial wastewater containing pathogens, industrial wastewater containing radioactivity, etc., most of which are organic pollutants (such as dyes) and inorganic heavy metal ions. Organic pollutants can still degrade over time, but heavy metal ions can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F101/20
CPCB01J20/20B01J20/28047B01J20/3085C02F1/283C02F2101/20
Inventor 计虎泉沈黎张德锁
Owner HAITAI TEXTILE SUZHOU
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