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Graphene-melamine foam aerogel and preparation method thereof

A melamine and graphene technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of small adsorption capacity and slow adsorption rate, achieve rapid adsorption and improve hydrophilic performance , the effect of enriching the pore structure

Inactive Publication Date: 2016-10-12
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The widely used adsorbents are biological materials and activated carbon, etc. These materials are low in cost and easy to use, but the adsorption capacity is small and the adsorption rate is slow.

Method used

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  • Graphene-melamine foam aerogel and preparation method thereof
  • Graphene-melamine foam aerogel and preparation method thereof
  • Graphene-melamine foam aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 40 mg of graphene oxide, dissolve in 20 mL of deionized water, and ultrasonically disperse for 3 h to form a uniform graphene oxide aqueous solution. Take 10mL of graphene oxide aqueous solution, mix it with 100mg of ascorbic acid, put it into the melamine foam purchased from Suzhou Xinkerui Company, put it in an oven at 80°C for 3h, and obtain the graphene-melamine foam hydrogel; After being replaced in deionized water for 24 hours, the graphene-melamine foam airgel was prepared by freeze-drying at -70°C for 24 hours.

[0023] The airgel prepared in this example is a black block with a density of 11 mg / cm 3 , the specific surface area is 236m 2 / g. Its structure is as figure 1 As shown, the graphene sheet is covered on the melamine foam skeleton.

[0024] The rapid absorption effect test of the airgel prepared in this embodiment to the methylene blue solution is as follows: configure the methylene blue solution with a concentration of 10 mg / L, take 100 mL in ...

Embodiment 2

[0027] Weigh 20 mg of graphene oxide, dissolve in 20 mL of deionized water, and ultrasonically disperse for 1 h to form a graphene oxide aqueous solution. Take 16 mL of graphene oxide aqueous solution, add 160 mg of ascorbic acid and 4 mL of dopamine solution with a concentration of 2 mg / mL, mix evenly, put it into melamine foam, and place it in an oven at 95 °C for 12 hours to obtain graphene-melamine foam hydration glue. After the hydrogel was replaced in de-tert-butanol for 24 hours, it was freeze-dried at -70°C for 48 hours to prepare graphene-melamine foam airgel.

[0028] The airgel prepared in this example is a black block with a density of 14 mg / cm 3 , the specific surface area is 318m 2 / g. The maximum absorption of methylene blue is 282 mg / g, the maximum absorption of crystal violet is 319 mg / g, and the maximum absorption of orange G is 67 mg / g. The fast adsorption time for methylene blue is 70s.

Embodiment 3

[0030] Weigh 60 mg of graphene oxide, dissolve in 20 mL of deionized water, and ultrasonically disperse for 4 h to form a uniform graphene oxide aqueous solution. Take 18 mL of graphene oxide aqueous solution, add 2 mL of dopamine solution with a concentration of 2 mg / mL, mix well, put it into melamine foam, and place it in an oven at 95 °C for 20 h to obtain graphene-melamine foam hydrogel. After replacing the hydrogel with ethanol for 24 hours, it was freeze-dried at -70°C for 72 hours to prepare a graphene-melamine foam aerogel.

[0031] The airgel prepared in this example is a black block with a density of 9 mg / cm 3 , the specific surface area is 276m 2 / g. The maximum absorption of methylene blue is 241 mg / g, the maximum absorption of crystal violet is 276 mg / g, and the maximum absorption of orange G is 49 mg / g. The fast adsorption time for methylene blue is 88s.

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Abstract

The invention discloses graphene-melamine foam aerogel and a preparation method thereof. The aerogel is black and blocky, density is 8-15mg / cm<3>, and specific surface area is 100-500m<2> / g. The preparation method comprises the following steps: (1) mixing graphene oxide with deionized water to obtain graphene oxide aqueous solution; (2) mixing the graphene oxide aqueous solution with a reducing agent to obtain mixed solution, then putting melamine foams into the mixed solution, and carrying out constant temperature hydrothermal reaction to obtain graphene-melamine foam hydrogel; and (3) putting the hydrogel into a solvent to be cleaned, and then carrying out freeze drying, so that the graphene-melamine foam aerogel is obtained. The graphene-melamine foam aerogel disclosed by the invention has the advantages that superhydrophilic melamine foams are utilized as a skeleton structure to form graphene aerogel, so that the aerogel can be easily immersed in water and can rapidly adsorb organic pollutants in the water; meanwhile, due to addition of the melamine foams, compression performance of the aerogel is improved, and the aerogel can be recycled.

Description

technical field [0001] The invention relates to a preparation method of an airgel, in particular to a graphene-melamine foam airgel and a preparation method thereof. Background technique [0002] With the continuous development of industry and technology, the problem of environmental pollution is becoming more and more serious, and effective protection and treatment have become urgent problems to be solved. Water pollution has the most direct impact on daily life and poses a serious threat to health. How to effectively treat heavy metal ions, organic solvents and organic dyes in industrial wastewater has always been the focus of researchers. At present, adsorption method is the most efficient, simple and low-cost treatment method to solve water pollution. The widely used adsorbents are biological materials and activated carbon, etc. These materials are cheap and easy to use, but the adsorption capacity is small and the adsorption rate is slow. Therefore, it is urgent to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/22C02F1/28C02F101/38C02F101/36C02F101/34
CPCB01J20/20B01J20/226B01J20/28011B01J20/28061C02F1/281C02F1/285C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 晏超堵晴川许凡
Owner JIANGSU UNIV OF SCI & TECH
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