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Method for removing metal ions in graphite oxide

A technology of metal ions and graphite, which is applied in the field of removal of metal ions in graphite oxide, can solve the problems of weakened electrostatic force of graphene oxide, difficult to be washed away, and edge defects of graphene, so as to reduce the amount of sewage treatment and increase static electricity. function, the effect of improving the removal efficiency

Active Publication Date: 2019-10-01
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the introduction of metal ions (such as Mn 2+ , Fe 2+ ), will be strongly complexed by carboxylate ions on the edge of graphene oxide, making it difficult to be washed away in the subsequent washing process
The existence of metal ions is prone to the following problems: (1) due to the complexation of metal ions, the electrostatic force of graphene oxide is weakened, which in turn affects the stripping of graphite oxide; (2) due to the non-conductivity of metal oxide itself It is easy to generate defects at the edge of graphene, which will affect the mechanical and electrical properties of graphene during use; (3) because graphene is expected to be used in the manufacture of wearable electronic products (such as flexible graphene mobile phones), it will directly contact with the body. Contact, serious threat to biological health, and when electronic products containing graphene are discarded as electronic waste, there is also a potential hazard of polluting the environment
[0004] Due to the above-mentioned problems caused by the metal ions in graphite oxide, the application of graphene is greatly limited.

Method used

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  • Method for removing metal ions in graphite oxide
  • Method for removing metal ions in graphite oxide
  • Method for removing metal ions in graphite oxide

Examples

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Embodiment 1

[0029] The graphite oxide used in this example is obtained by the following preparation method: in an ice-water bath at 0°C to 15°C, add 1 g of graphite into 100 mL of concentrated sulfuric acid with a mass concentration of 95% to 98%, and divide it within 1 hour under stirring. A total of 3g of potassium permanganate was added for 6 times. After the addition, continue to stir in the ice-water bath for 1h, then raise the temperature to 35°C, keep it for 2h, add 215mL of deionized water, then raise the temperature to 98°C, keep it for 1h, and then Add 200 mL of deionized water and 30% hydrogen peroxide until the solution has no bubbles, and after suction filtration is completed, graphite oxide is obtained.

[0030] First use hydrochloric acid and deionized water to prepare an acidic aqueous solution with a pH value of 3, then add disodium EDTA to the acidic aqueous solution at a mass ratio of 1:200 with deionized water and stir evenly; get the obtained graphite oxide, press each...

Embodiment 2

[0033] The graphite oxide preparation method that present embodiment adopts is identical with embodiment 1, omission.

[0034] First, use phytic acid and deionized water at a mass ratio of 1:500 to prepare an acidic aqueous solution with a pH of 1.6; take the obtained graphite oxide, take 800mL of the prepared acidic aqueous solution each time, and centrifuge at a speed of 3000r / min Remove the supernatant for 10 minutes, and repeat the washing for a total of three times; then use 800 mL of deionized water, centrifuge and wash for 10 minutes at a speed of 3000 r / min, after removing the supernatant, add the obtained graphite oxide to 800 mL of deionized water to disperse and freeze Drying yielded graphite oxide solid.

[0035] According to the ICP test, the manganese ion content in the graphite oxide solid is 4.7449ppm.

Embodiment 3

[0037] The graphite oxide preparation method that present embodiment adopts is identical with embodiment 1, omission.

[0038] First use nitric acid and deionized water to prepare an acidic aqueous solution with a pH value of 3, then add sodium phosphate to the pickling aqueous solution at a mass ratio of 1:500 to deionized water and stir evenly; take the obtained graphite oxide, press each Take the prepared 800mL acidic aqueous solution, centrifuge and wash at 3000r / min for 10min to remove the supernatant, repeat the washing for a total of three times, then use 800mL of deionized water, centrifuge and wash at 3000r / min for 10min, remove the supernatant After clearing the liquid, the obtained graphite oxide was added to 800 ml of deionized water to disperse and freeze-dried to obtain graphite oxide solid.

[0039] According to the ICP test, the manganese ion content in the graphite oxide solid is 8.326ppm.

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Abstract

The invention discloses a method for removing metal ions in graphite oxide. The method is to prepare an acidic aqueous solution containing a metal ion complexing agent, and then use it to wash the graphite oxide until the metal ion concentration is lower than 10 ppm; The preparation of the acidic aqueous solution of the mixture is to add the metal ion complexing agent to the acidic aqueous solution at a mass ratio of 1:800-1:80 to the deionized water in the acidic aqueous solution and stir evenly. In the method for removing metal ions in graphite oxide disclosed by the invention, the acidic aqueous solution provides an acidic environment, thereby effectively inhibiting the ionization of carboxylate ions on the edge of graphite oxide; at the same time, the metal ion complexing agent with strong complexation can capture the metal released by carboxylate ions, to quickly remove the role of metal ions.

Description

technical field [0001] The invention belongs to the technical field of impurity removal for graphite materials, and in particular relates to a method for removing metal ions in graphite oxide. Background technique [0002] In 2004, two scientists from the University of Manchester, Andre Jem and Kostya Novoselov, discovered that single-layer graphene can be prepared by tearing the tape, and won the 2010 Nobel Prize in Physics Since then, due to the excellent mechanical properties of graphene and good thermal conductivity (5300W / m·K), electrical conductivity (15000cm 2 / V s) and light transmittance (absorbing 2.3% of light), it is expected to be widely used in many fields such as new energy batteries, sensors, computers, semiconductors, etc. [0003] At present, the methods for preparing graphene include mechanical exfoliation method, redox method, SiC epitaxial growth method and chemical vapor deposition (CVD), but only the redox method can achieve large-scale production. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/23
Inventor 傅强刘雨杭陈枫柴颂刚
Owner SICHUAN UNIV
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