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Process for preparing nano porous graphite

A nano-porous and graphite technology, applied in the field of nano-materials, can solve the problem of large pores of expanded graphite and achieve the effect of improving the adsorption capacity

Inactive Publication Date: 2005-03-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the pores of expanded graphite prepared by the existing expanded graphite technology are relatively large, generally above the micron level.

Method used

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  • Process for preparing nano porous graphite
  • Process for preparing nano porous graphite
  • Process for preparing nano porous graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 3 grams of flake graphite with a fineness of 80 mesh and a carbon content of 90%, 30 grams of sulfuric acid with a concentration of 98% and 2 grams of potassium permanganate, put them into a beaker, stir and mix with a glass rod. Then put the beaker into a constant temperature water bath, and the temperature of the water bath is set at 45°C. The mixture was continuously stirred with a magnetic rod, and the stirring RPM was set at 300. After the intercalation, the water washing procedure was carried out. Filter the mixture with a 200-mesh stainless steel mesh, then put the filter residue into a 500ml beaker, enter 400ml of clear water, stir thoroughly with a glass rod, and then filter with a 200-mesh stainless steel mesh. Repeat wash twice. Measure the pH of the last stirred solution to be 0.2. The final filtered residue was placed in a glass petri dish and dried in an oven. The temperature of the oven is 60° C., and the duration of the drying process is 10 hour...

Embodiment 2

[0021] Take 3 grams of flake graphite with a fineness of 50 mesh and a carbon content of 95%, 30 grams of sulfuric acid with a concentration of 98% and 2 grams of potassium permanganate, put them into a beaker, stir and mix them with a glass rod. Then put the beaker into a constant temperature water bath, and the temperature of the water bath is set to 50°C. The mixture was continuously stirred with a magnetic rod, and the stirring RPM was set at 300. After the intercalation, the water washing procedure was carried out. Filter the mixture with a 200-mesh stainless steel mesh, then put the filter residue into a 500ml beaker, enter 400ml of clear water, stir thoroughly with a glass rod, and then filter with a 200-mesh stainless steel mesh. Repeat wash 4 times. Measure the pH of the last stirred solution to be 3.0. The final filtered residue was placed in a glass petri dish and dried in an oven. The temperature of the oven is 60° C., and the duration of the drying process is ...

Embodiment 3

[0023] Take 3 grams of flake graphite with a fineness of 80 mesh and a carbon content of 90%, 30 grams of sulfuric acid with a concentration of 98% and 2 grams of potassium permanganate, put them into a beaker, stir and mix with a glass rod. Then put the beaker into a constant temperature water bath, and the temperature of the water bath is set to 60°C. The mixture was continuously stirred with a magnetic rod, and the stirring RPM was set at 300. After the intercalation, the water washing procedure was carried out. Filter the mixture with a 200-mesh stainless steel mesh, then put the filter residue into a 500ml beaker, enter 400ml of clear water, stir thoroughly with a glass rod, and then filter with a 200-mesh stainless steel mesh. Repeat washing 6 times. The pH of the last stirred solution was measured to be 6.0. The final filtered residue was placed in a glass petri dish and dried in an oven. The temperature of the oven is 60° C., and the duration of the drying process ...

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Abstract

The preparation of nanometer porous graphite includes thermochemical process to prepare graphite intercalation compound, microwave process to swell the graphite intercalation compound and mechanical process to extrude expanded graphite. The porous graphite m prepared through the said process contains nanometer level pores, has effectively improved liquid or gas matter absorbing capacity, strengthened heat exchanging and transferring capacity, etc. and thus wide applicated in ecological building, environment protection, purification and other fields.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing porous graphite with nanoscale pores. Background technique [0002] A major branch of graphite materials is expanded graphite and its derivative technologies. The so-called expanded graphite is a porous and loose graphite material with high porosity obtained by intercalating flake graphite raw materials by thermochemical or electrochemical methods, and then expanding them in a high temperature environment. After proper post-treatment, expanded graphite can be used in a variety of applications, including oil cleaning materials, sound insulation materials, thermal insulation materials, and medical materials. [0003] However, the pores of the expanded graphite prepared by the existing expanded graphite technology are relatively coarse, generally above the micron level. Excessively coarse pores severely restrict the performance of exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C01B31/04C04B35/536
Inventor 张东
Owner TONGJI UNIV
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