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Preparation method and application of expanded graphite with preferential adsorption performance on aromatic compounds

A preferential adsorption, aromatic technology, used in the preparation of expanded graphite, the preparation of expanded graphite, can solve problems such as unfavorable, light weight and loose adsorption performance.

Active Publication Date: 2020-09-04
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For expanded graphite used as an adsorption material, although its adsorption performance is very good, its light weight and looseness have a great impact on its adsorption performance, especially its adsorption operation performance.
However, the current research still tends to obtain a higher degree of expansion, which will be more unfavorable when used as an adsorption material.

Method used

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  • Preparation method and application of expanded graphite with preferential adsorption performance on aromatic compounds
  • Preparation method and application of expanded graphite with preferential adsorption performance on aromatic compounds
  • Preparation method and application of expanded graphite with preferential adsorption performance on aromatic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing expanded graphite with preferential adsorption properties for aromatic compounds, comprising the following steps:

[0036] Natural flake graphite (80 mesh, 99% carbon content, Qingdao Nanshu Hongda Graphite Products Co., Ltd.) 5 grams, add 10 ml of NMP, 12 ml of sulfolane and 15 ml of water, shake and mix, add 2 ml of concentrated sulfuric acid, shake and mix , add 0.5 g of potassium permanganate, shake, dissolve and mix evenly, ultrasonicate for 5 minutes, and then shake at room temperature for 1 hour;

[0037] Add hydrogen peroxide dropwise under stirring until the brown color and the purple color of the supernatant disappear, then add 2 ml in excess;

[0038] After filtering and washing until the filtrate is nearly neutral (pH test paper test), the filter paper and intercalated graphite are transferred to an oven at 105°C for drying;

[0039] The intercalated graphite is transferred to a beaker, and 500 watts of microwave radiation is irradiat...

Embodiment 2

[0042] A method for preparing expanded graphite with preferential adsorption properties for aromatic compounds, comprising the following steps:

[0043] 5 g of natural flake graphite (80 mesh, 99% carbon content, Qingdao Nanshu Hongda Graphite Products Co., Ltd.), add 12 ml of sulfolane and 10 ml of water, shake and mix, add 1 ml of concentrated sulfuric acid, shake and mix, add 0.4 After 1 gram of potassium permanganate was shaken to dissolve and mixed evenly, ultrasonically treated for 5 minutes, and then shaken at room temperature for 1 hour;

[0044] Add hydrogen peroxide dropwise under stirring until the brown color and the purple color of the supernatant disappear, then add 2 ml in excess;

[0045] After filtering and washing until the filtrate is nearly neutral (pH test paper test), the filter paper and intercalated graphite are transferred to an oven at 105°C for drying;

[0046] The intercalated graphite was transferred to a beaker, and 500 watts of microwave radiati...

Embodiment 3

[0049]A method for preparing expanded graphite with preferential adsorption properties for aromatic compounds, comprising the following steps:

[0050] Natural flake graphite (80 mesh, 99% carbon content, Qingdao Nanshu Hongda Graphite Products Co., Ltd.) 5 grams, add 10 ml of NMP and 10 ml of water, shake and mix, add 2 ml of concentrated sulfuric acid, shake and mix, add 0.5 After 1 gram of potassium permanganate was shaken to dissolve and mixed evenly, ultrasonically treated for 5 minutes, and then shaken at room temperature for 1 hour;

[0051] Add hydrogen peroxide dropwise under stirring until the brown color and the purple color of the supernatant disappear, then add 2 ml in excess;

[0052] After filtering and washing until the filtrate is nearly neutral (pH test paper test), the filter paper and intercalated graphite are transferred to an oven at 105°C for drying;

[0053] The intercalated graphite is transferred to a beaker, and 500 watts of microwave radiation is i...

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Abstract

The invention relates to a preparation method of expanded graphite with preferential adsorption performance on aromatic compounds, in particular to a preparation method of expanded graphite with simple operation, low emission and low consumption, and belongs to the field of adsorption materials. The preparation method comprises the following steps: preparing a uniform solution from tetramethylenesulfone (TMS), N-methyl pyrrolidone (NMP) and water; adding concentrated sulfuric acid and potassium permanganate, and uniformly mixing; adding natural crystalline flake graphite, carrying out ultrasonic mixing, and then carrying out continuous oscillation; adding a reducing agent for reduction, filtering, washing with water until filtrate is nearly neutral, and drying to obtain expandable graphite; and carrying out microwave expansion to obtain the slightly-expanded graphite (SEG). According to the method, complex equipment and harsh operation conditions are not needed, the operation is extremely simple, the cost is low, the consumption is low, the toxicity is low, the emission is low, the obtained product only has the expansion ratio of dozens of times, and the use and operation performance of the product is good.

Description

technical field [0001] The invention relates to a method for preparing expanded graphite with preferential adsorption performance for aromatic compounds, in particular to a method for preparing expanded graphite with simple operation, low emission and low consumption, and belongs to the field of adsorption materials. Background technique [0002] Expanded Graphite (Expanded Graphite, EG) generally expands rapidly by pre-oxidation and intercalation followed by high temperature or microwave treatment to obtain a fluffy, large specific surface area, worm-like flexible graphite material, and its raw material is purified from natural graphite ore Natural flake graphite obtained later. The traditional preparation method of expanded graphite requires the use of a large amount of concentrated sulfuric acid, concentrated nitric acid, concentrated perchloric acid, potassium permanganate, potassium dichromate and other high-concentration strong oxidizing reagents, sometimes assisted by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225B01J20/20B01J20/30B01D15/08
CPCC01B32/225B01J20/20B01D15/08
Inventor 刘振学姜琳媛刘润洲张晓文魏晓璇
Owner SHANDONG UNIV OF SCI & TECH
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