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High-efficiency separation and purification method of graphite oxide

A technology for separation and purification of graphite, applied in the direction of graphite, etc., can solve the problems of cumbersome operation steps, long production cycle, and much pollution, and achieve the effect of broad application prospects, short production cycle, and less pollution

Inactive Publication Date: 2014-01-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional methods such as natural sedimentation, vacuum filtration, and intermittent centrifugal concentration in the laboratory have low production efficiency, long production cycle, high pollution, high energy consumption, cumbersome operation steps, and high cost, and are not suitable for large-scale continuous production of graphite oxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Measure a certain volume of deionized water and pour it into a beaker, stir at a speed of 150r / min at a temperature of 85°C, and weigh aluminum sulfate (Al(SO 4 ) 3 18H 2 O), slowly and evenly added to the stirred deionized water for dissolving, and stirred for 30min to obtain the flocculant solution. According to 1000ppm (g / m 3 ) to the dispersion concentration of the flocculant solution into the graphite oxide suspension at a uniform speed, stirred for 0.5 min, and after standing for 20 min, stable graphite oxide flocs were obtained, and the stratification of the suspension was observed. The supernatant and solid matter are vacuum filtered to obtain graphite oxide with high solid content. Add deionized water again, mix well and repeat the above vacuum filtration process 8 times until the pH value of the filtrate reaches 7.6, that is, 99.8% high-purity graphite oxide is obtained.

Embodiment 2

[0021] Example 2: Measure a certain volume of deionized water and pour it into a beaker, stir at a speed of 800r / min at a temperature of 65°C, weigh polyferric sulfate (PFS) according to the ratio of flocculant: deionized water 1g: 1000ml, Slowly and evenly add to stirred deionized water to dissolve, and stir for 2 hours to obtain a flocculant solution. According to 600ppm (g / m 3 ) to the dispersion concentration of the flocculant solution into the graphite oxide suspension at a uniform speed, stirred for 10 minutes, and after standing for 60 minutes, stable graphite oxide flocs were obtained, and the stratification of the suspension was observed. Centrifuge the supernatant and solid matter to obtain graphite oxide with high solid content. Add deionized water again, mix well and repeat the centrifugation process 7 times until the pH value of the filtrate reaches 7.2, that is, 99.5% high-purity graphite oxide is obtained.

Embodiment 3

[0022] Example 3: Measure a certain volume of deionized water and pour it into a beaker, stir at a speed of 1200r / min at a temperature of 55°C, and weigh polyaluminum ferric chloride (PAFC) according to the ratio of flocculant: deionized water 1g: 2000ml ), slowly and uniformly added to stirred deionized water to dissolve, and stirred for 4 hours to obtain a flocculant solution. According to 200ppm (g / m 3 ) to the dispersion concentration of the flocculant solution into the graphite oxide suspension at a uniform speed, stirred for 30 minutes, and stabilized graphite oxide flocs were obtained after standing for 4 hours, and the suspension layer was observed. Centrifuge the supernatant and solid matter to obtain graphite oxide with high solid content. Add deionized water again, mix well and repeat the above physical separation process 4 times until the pH value of the filtrate reaches 6.2, that is, 98.7% high-purity graphite oxide is obtained.

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PUM

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Abstract

The invention relates to a high-efficiency separation and purification method of graphite oxide, which comprises the following steps: slowly and uniformly adding flocculant into deionized water, and dissolving while stirring, thus obtaining a flocculant solution; adding the flocculant solution into a graphite oxide suspension at a uniform speed, stirring, and standing to obtain a liquid containing stable graphite oxide floccules; performing solid-liquid physical separation on the liquid containing stable graphite oxide floccules to obtain high-solid-content graphite oxide; and adding the high-solid-content graphite oxide into deionized water again, uniformly mixing, and repeating the physical separation process until the pH value of the filtrate is 4-8, thus obtaining high-purity graphite oxide. The method provided by the invention has the advantages of high product yield, short production cycle, less pollution, low energy consumption and simple operation process.

Description

technical field [0001] The invention belongs to a high-efficiency separation and purification method of graphite oxide. Background technique [0002] Graphene is a two-dimensional carbon atom crystal with a thickness of one atom. It is the thinnest substance artificially produced at present. It is considered to be the basic structural unit of fullerene, carbon nanotube and graphite (Geim, A.K. et al. Nature Materials 6,183 (2007)). As a new type of two-dimensional nano-carbon material, graphene has excellent mechanical, thermal, optical, and electrical properties. It has broad application prospects in the fields of advanced energy storage and conversion, thermal management materials, and nanocomposite materials, and the market demand is increasingly strong. Among them, the large-scale and controllable preparation of graphene is the premise and basis for its commercial application and promotion. However, in terms of industrialization implementation, all countries are in the...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/23
Inventor 陈成猛张倩孔庆强王大力王炜苏小威张兴华蔡榕
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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