Preparation method of high-adsorbability graphene aerogel

A graphene airgel, high adsorption technology, applied in the direction of graphene, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of not highlighting the advantages of graphene, achieve faster reduction speed, simple preparation method, The effect of easy operation

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

But at this stage, graphene oxide’s adsorption of colored dyes does not highlight the advantages of graphene products, and sometime...

Method used

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  • Preparation method of high-adsorbability graphene aerogel
  • Preparation method of high-adsorbability graphene aerogel
  • Preparation method of high-adsorbability graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 16 mg of solid graphene oxide and place it in 8 mL of deionized water, ultrasonically for 1 h to prepare an aqueous solution of graphene oxide, transfer the aqueous solution into a 20 mL cylindrical glass bottle, mix with 0.3 mg / mL ammonia borane solution and 0.2 mmol / mL ferrous sulfate solution was mixed at a volume ratio of 8:1:1 and mechanically stirred for 20min to obtain a mixed solution. The cylindrical glass bottle was reacted at 95°C for 8h to obtain a cylindrical product; the cylindrical product was soaked in In deionized water for 48 hours, the cylindrical product was pre-frozen at -4°C; the pre-frozen material was placed in a freeze dryer and freeze-dried at -80°C for 48 hours to obtain graphene aerogels , the SEM image of graphene aerogel is shown in figure 1 The nitrogen adsorption curve of the aerogel is shown in figure 2 As shown, the graphene sheets in the aerogel are stacked on each other to form a porous structure and facilitate its application...

Embodiment 2

[0026] Weigh 30mg of solid graphene oxide and place it in 15mL of deionized water, ultrasonicate for 1h to make an aqueous solution of graphene oxide, transfer the aqueous solution into a 50mL cylindrical glass bottle, mix with 0.5mg / mL ammonia borane solution and 0.5 mmol / mL ferrous sulfate solution was mixed at a volume ratio of 10:1:1, ultrasonically dispersed for 15 min to obtain a mixed solution, and the cylindrical glass bottle was reacted at 120 °C for 6 h to obtain a cylindrical product; the cylindrical product was soaked in In deionized water for 24 hours, the cylindrical product was pre-frozen at -4°C; the pre-frozen material was placed in a freeze dryer and freeze-dried at -80°C for 24 hours to obtain graphene aerogels .

Embodiment 3

[0028] Weigh 30mg of solid graphene oxide and place it in 10mL of deionized water, ultrasonicate for 1h to prepare an aqueous solution of graphene oxide, transfer the aqueous solution into a 50mL cylindrical glass bottle, mix with 0.3mg / mL ammonia borane solution and 0.5 mmol / mL of ferrous sulfate solution was mixed at a volume ratio of 8:1:1, and mechanically stirred for 25 minutes to obtain a mixed solution. The cylindrical glass bottle was reacted at 105 °C for 7 hours to obtain a cylindrical product; the cylindrical product was soaked In deionized water for 24h, the cylindrical product was pre-frozen at -4°C; the pre-frozen material was placed in a freeze dryer, and freeze-dried at -80°C for 72h to obtain graphene gas condensate. glue.

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Abstract

The invention discloses a preparation method of graphene airgel with high adsorption performance, which comprises the following preparation steps: (1) adding graphene oxide into deionized water to prepare graphene oxide aqueous solution; (2) adding ammonia borane Mix the aqueous solution, ferrous sulfate aqueous solution and graphene oxide aqueous solution evenly; (3) prepare the graphene hydrogel by subjecting the mixed aqueous solution to constant temperature hydrothermal reaction; (4) soak the graphene hydrogel, pre-freeze, and then freeze After drying, graphene airgel with high adsorption performance can be obtained. The invention uses ammonia borane and ferrous sulfate to reduce graphene oxide, accelerates the reduction speed of constant temperature hydrothermal reaction, and has simple operation and simple preparation method; the prepared graphene airgel has an adsorption effect on rhodamine B dye Efficient, the adsorption can be basically completed in 3 hours.

Description

technical field [0001] The invention relates to a graphene material, in particular to a preparation method of a graphene aerogel with high adsorption performance. Background technique [0002] With the deepening of China's industrialization and urbanization, the topic of shortage of fresh water resources is increasingly on the agenda. Insufficient fresh water resources and the superposition of two problems of water pollution have made the water supply and demand situation particularly bleak. In addition to calling on the public to save water, another effective way to solve this problem is to recycle, treat and reuse wastewater. Among them, adsorption, filtration and other means are often used for the treatment of colored dye wastewater. At present, most of the materials used for filtration and adsorption of colored dye wastewater are carbon materials. The most common adsorbent carbon material is activated carbon, which has many advantages such as low price and large specif...

Claims

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Application Information

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IPC IPC(8): C01B31/04B01J20/20B01J20/30C02F1/28C02F101/38
CPCB01J20/20C01B2204/32C01P2004/03C02F1/283C02F2101/308
Inventor 晏超潘徐伟王耀
Owner JIANGSU UNIV OF SCI & TECH
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