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Biological oxidation graphite and preparation method thereof

A bio-oxidation, graphite technology, applied in the direction of graphite, can solve the problems of limiting graphene research progress and application fields, carbon skeleton lattice distortion, loss of excellent performance and other problems, to achieve good industrial application prospects and value, reduce the degree of oxidation, The effect of mild reaction conditions

Inactive Publication Date: 2012-10-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of preparing graphite oxide by chemical oxidation method, a large amount of strong acid and strong oxidizing substances are discharged, which is difficult to handle and causes great environmental pollution.
In addition, the process of preparing graphene by chemical oxidation-reduction method is easy to cause defects (Florian B., Jani K. and Arkady V. K. Structural Defects in Graphene. ACS NANO, 2011, 5(1): 26-41), π-π co- The yoke bonds are largely destroyed, and the carbon skeleton has obvious lattice distortion and distortion at the atomic level, losing many excellent properties
[0003] Therefore, the preparation of graphene by chemical oxidation-reduction method has inevitable disadvantages: a large amount of strong acid and strong oxidizing substances are discharged during the preparation of graphene by chemical oxidation-reduction method, which is easy to cause environmental pollution; graphene prepared by chemical method has more Structural defects lead to a great reduction in its chemical, electronic, mechanical and other excellent properties, severely limiting the research progress and application fields of graphene

Method used

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  • Biological oxidation graphite and preparation method thereof
  • Biological oxidation graphite and preparation method thereof
  • Biological oxidation graphite and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0030] Embodiment 1: A preparation method of bio-oxidized graphite according to the present invention comprises the following steps: The first step is graphite pretreatment. Add 1.0 g of graphite in a 250 mL conical flask, add deionized water to 100 g in the conical flask, put it in a 250W ultrasonic cleaning machine, and perform ultrasonic treatment at room temperature for 2 hours to obtain a graphite mixture with better dispersion properties;

[0031] The second step is to prepare 1.0L of 9K liquid medium, adjust the pH of the medium to 2.0 with 1 / 9 (v / v) dilute sulfuric acid, add 10g of 1% graphite mixed solution dispersed in the first step to the medium, and divide Pack into four 1.0L Erlenmeyer flasks, each bottle has a liquid volume of 250mL, and the graphite concentration is 0.1mg / mL. Among them, 1.0L of 9K liquid medium includes FeSO 4 ·7H 2 O 44.5g, (NH 4 ) SO 4 3.0g, MgSO 4 ·7H 2 O 0.5g, K 2 HPO 4 0.5g, KCl 0.1g, Ca(NO 3 ) 2 0.01g; FeSO 4 ·7H 2 O is st...

Embodiment 2

[0036] Embodiment 2: A preparation method of bio-oxidized graphite according to the present invention comprises the following steps: The first step is graphite pretreatment. Add 2.0g of graphite in a 250mL conical flask, add deionized water to 100g in the conical flask, put it into a 250W ultrasonic cleaning machine, and ultrasonically treat it for 4 hours at room temperature to obtain a graphite mixture with better dispersion properties;

[0037] The second step is to prepare 1.0L of 9K liquid medium, adjust the pH to 1.5 with 1 / 9 (v / v) dilute sulfuric acid, add 10g of the graphite mixture dispersed in the first step to the medium, and divide it into 4 pieces In a 1.0L Erlenmeyer flask, the volume of each bottle is 250mL, and the concentration of graphite contained is 0.2mg / mL. Among them, 1.0L of 9K liquid medium includes FeSO 4 ·7H 2 O 44.5g, (NH 4 ) SO 4 3.0g, MgSO 4 ·7H 2 O 0.5g, K 2 HPO 4 0.5g, KCl 0.1g, Ca(NO 3 ) 2 0.01g, FeSO 4 ·7H 2 O is sterilized by f...

Embodiment 3

[0040] Embodiment 3: A preparation method of bio-oxidized graphite according to the present invention comprises the following steps: The first step is graphite pretreatment. Add 0.5g of graphite to a 250mL conical flask, add deionized water to 100g to the conical flask, put it into a 250W ultrasonic cleaning machine, and perform ultrasonic treatment at room temperature for 20min to obtain a graphite mixture with good dispersion properties;

[0041] The second step is to prepare 1.0L of 9K liquid medium, adjust the pH to 2.5 with 1 / 8 (v / v) dilute sulfuric acid, add 10g of the graphite mixture dispersed in the first step to the medium, and divide it into 4 pieces of 1.0L In the Erlenmeyer flask, the volume of each bottle is 250mL, and the graphite concentration is 0.05mg / mL. Among them, 1.0L of 9K liquid medium includes FeSO 4 ·7H 2 O 44.5g, (NH 4 ) SO 4 3.0g, MgSO 4 ·7H 2 O 0.5g, K 2 HPO 4 0.5g, KCl 0.1g, Ca(NO 3 ) 2 0.01g, FeSO 4 ·7H 2 O is sterilized by 0.22μm ...

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Abstract

The invention discloses biological oxidation graphite and a preparation method thereof. The preparation method includes dispersing the graphite in water to form a graphite mixed liquor with a good dispersion, adding the graphite mixed liquor into a ferrous oxide thiobacillus culture medium, sterilizing, cooling, inoculating Thiobacillus ferrooxidans, culturing for several days, so that an oxygen containing group is introduced and the dispersed graphite is oxidized under the action of the microorganismThiobacillus ferrooxidans, removing minerals and other ions which are generated in the oxidation process after the culturing is finished, until the potential of hydrogen (pH) is neutral, and vacuum drying to obtain the pure biological oxidation graphite. According to the biological oxidation graphite and the preparation method thereof, the microorganism Thiobacillus ferrooxidans capable of oxidizing minerals is used as a strain, and the ultrasonic dispersed graphite is subjected to a biological oxidation. Compared with traditional chemical oxidation methods for graphite, the preparation method has the advantages that the reaction condition is mild and controllable, the reaction process is environment-friendly and pollution-free, the prepared biological oxidation graphite has few defects, and the like.

Description

technical field [0001] The invention belongs to the green biocontrollable preparation technology of graphite oxide, in particular to a biological graphite oxide and a preparation method thereof. Background technique [0002] At present, there are three main methods for preparing graphene oxide by chemical oxidation: Staudenmaier, Brodie and Hummers. The basic principle of its preparation is to treat graphite with a strong protonic acid first to form graphite interlayer compounds, and then add a strong oxidant to oxidize it, and insert a large number of oxygen-containing groups such as carboxyl, hydroxyl, and epoxy groups between graphite layers. In the process of preparing graphite oxide by chemical oxidation method, a large amount of strong acid and strong oxidizing substances are discharged, which are difficult to handle and cause great environmental pollution. In addition, the process of preparing graphene by chemical oxidation-reduction method is easy to cause defects (...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/23
Inventor 孙东平朱春林汪信杨加志晁成陈春涛聂英
Owner NANJING UNIV OF SCI & TECH
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