A kind of preparation method of graphene aerogel and application thereof

A technology of graphene airgel and enol gel, which is applied in the direction of graphene, chemical instruments and methods, and other chemical processes, can solve the problem of large adsorption capacity and inability to realize in-situ adsorption-on-line desorption of heavy metal ions, graphite Problems such as large specific surface area of ​​olefinic airgel materials

Active Publication Date: 2021-09-10
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this application only focuses on the characteristics of large specific surface area and large adsorption capacity of graphene airgel materials, and cannot achieve in-situ adsorption-on-line desorption of heavy metal ions, only static adsorption of heavy metal ions
At present, the method of using graphene airgel material to absorb and electrochemically enrich and recover heavy metal ions has not been reported.

Method used

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  • A kind of preparation method of graphene aerogel and application thereof
  • A kind of preparation method of graphene aerogel and application thereof
  • A kind of preparation method of graphene aerogel and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1 prepares graphene airgel

[0030] (1) Take 50 mL of graphene oxide aqueous solution prepared by the Hummers method with a concentration of 5 mg / L, add it to a 50 mL centrifuge tube, centrifuge at 12000 rpm for 30 min, remove the supernatant after each centrifugation, and add 50 mL of absolute ethanol to prepare graphite Enol solution, the graphene alcohol gel concentration formed is 5mg / mL;

[0031] The above-mentioned Hummers method can be found in literature L. Zhang, J. Liang, Y. Huang, Y. Ma, Y. Wang, Y. Chen, Carbon 2009, 47, 3365.

[0032] In the specific implementation, the centrifugation time and frequency of the graphene oxide aqueous solution and the amount of absolute ethanol can be controlled according to the actual situation, as long as the concentration of the graphene alcohol gel finally obtained is within the range of 0.2-10.0mg / mL purpose of the invention.

[0033] (2) Pour the graphene alcohol gel into the hydrothermal reaction kettle, a...

Embodiment 2

[0039] The graphene airgel photograph that present embodiment obtains is as figure 1 As shown, its height: 3~4cm, diameter 2~3cm, pores 1nm~50μm, specific surface area about 1800~2200m 2 / g, density 1~5mg / cm 3 . Embodiment 2 heavy metal ion adsorption-desorption test

[0040] Preparation of simulated heavy metal ion solution: Weigh 15 mg of anhydrous copper sulfate, dissolve it in 1L of ultrapure water, and adjust the pH of the solution to pH=5 after it is completely dissolved; 2+ The concentration is 6mg / L.

[0041] The adsorption-desorption test procedure is as follows: figure 2 Shown:

[0042] (a) Adsorption: the graphene airgel obtained in Example 1 is assembled in a filter-type column electrode reaction system as an anode: the graphene airgel is packed into a column filter device, and the titanium sheet is tightly pressed on the graphite The aerogel is used as a connection to connect to the power supply; another titanium sheet is used as the cathode to form the ent...

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Abstract

The application discloses a preparation method of graphene airgel and its application. The preparation method of the graphene airgel is as follows: first, centrifuge the graphene oxide aqueous solution, and continuously add absolute ethanol to obtain graphene alcohol gel, and then 100 ~180°C, conduct in situ hydrothermal reaction for 4~12 h to obtain graphene hydrogel, then immerse in a mixed solvent of ethanol and acetone, add distilled water, suck out the mixed solvent, and then dry in liquid nitrogen for 20~60 h, then placed in a tube furnace for heat treatment in Ar at 400-600°C for 2-10 h, and finally placed in an ozone atmosphere for 5-30 min to obtain the graphene airgel; this material can be used for adsorption Heavy metal ions in wastewater have a large specific surface area, large adsorption capacity, and good conductivity, which can realize electrochemical desorption, enrichment and recovery of heavy metal ions, low energy consumption, and the pH of the effluent is close to neutral, which is within the environmental tolerance range. No secondary pollution.

Description

technical field [0001] The invention relates to the field of nano-carbon material preparation, in particular to a preparation method of a graphene airgel adsorption material with a high specific surface area and its application in adsorption, electrochemical enrichment and recovery of heavy metal ions. Background technique [0002] With the rapid development of industry and the acceleration of urbanization, more and more industrial and mining wastewater and domestic sewage are discharged directly without proper treatment, causing heavy metal pollution in water areas. Heavy metal ion wastewater often contains copper, silver, nickel, lead, mercury and other precious metals. If it is discharged directly without treatment, it will inevitably cause serious pollution to the environment. If it is discharged without recycling, it will inevitably cause a great waste of resources. At the same time, with the rapid development of my country's industry, a large amount of heavy metal wast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/28047C01B2204/20C01B2204/32C02F1/283C02F2101/20C01B32/184
Inventor 高冠道潘梅兰潘丙才
Owner NANJING UNIV
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