Preparation method and applications of graphene aerogel

A graphene aerogel, enol gel technology, applied in graphene, chemical instruments and methods, other chemical processes, etc., can solve the problem of graphene aerogel materials with large specific surface area, large adsorption capacity, and inability to achieve heavy metals Ion in-situ adsorption-on-line desorption and other problems, to achieve the effect of good conductivity, large adsorption capacity, and no secondary pollution

Active Publication Date: 2018-07-31
NANJING UNIV
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  • Abstract
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  • 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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  • Preparation method and applications of graphene aerogel
  • Preparation method and applications of graphene aerogel
  • Preparation method and applications of graphene aerogel

Examples

Experimental program
Comparison scheme
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 invention discloses a preparation method and applications of graphene aerogel. The preparation method comprises following steps: a graphene oxide aqueous solution is subjected to centrifugation, and absolute ethyl alcohol is added continuously so as to obtain a graphene alcohol gel; 4 to 12h of in-suit hydro-thermal reaction is carried out at 100 to 180 DEG C so as to obtain a graphene hydrogel; the graphene hydrogel is immersed in a mixed solvent of ethanol and acetone, distilled water is added, the mixed solvent is removed via suction, an obtained product is introduced into liquid nitrogen for 20 to 60h of drying, is introduced into a tubular furnace for 2 to 10h of heat treatment in 400 to 600 DEG C Ar, and then is treated in ozone atmosphere for 5 to 30min so as to obtain the graphene aerogel. The graphene aerogel can be used for absorbing heavy metal ions in waste water, is large in specific surface area, adsorption capacity, and excellent in conductivity, is capable of realizing electrochemical desorption, realizing enrichment recovery of heavy metal ions, and is low in energy consumption; the pH value of discharged water is close to 7, and is in an environmentally acceptable range; and no secondary pollution is caused.

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 Applications(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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