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A kind of preparation method of graphene-modified hydrophobic activated carbon

A graphene modification, activated carbon technology, applied in separation methods, chemical instruments and methods, climate sustainability, etc., can solve problems such as reduced adsorption capacity, and achieve the effect of increasing hydrophobicity and ensuring regeneration

Active Publication Date: 2022-07-05
ZHONGSHAN FLASHLIGHT POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Activated carbon plays a very important role in the treatment of volatile organic gases (VOCs) and other environmental pollutants due to its developed pore structure and huge specific surface area, but there are still some difficult problems in the application
Ordinary activated carbon will produce some hydrophilic groups on the surface of activated carbon during the activation process, resulting in a certain degree of hydrophilicity of activated carbon, which will lead to the adsorption of organic pollutants such as VOCs by activated carbon in a humid environment greatly reduced capacity

Method used

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  • A kind of preparation method of graphene-modified hydrophobic activated carbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a graphene-modified hydrophobic activated carbon, comprising the following steps:

[0020] S1, the hard husk is cleaned, dried, pulverized with a pulverizer, and sieved to obtain husk powder below 200 meshes; the hard husk includes coconut shell, apricot shell, walnut shell, and peach shell.

[0021] S2. Weigh 100 grams of husk powder and 350 mL of ZnCl with a concentration of 0.3 g / mL 2 The -HCl solution is mixed evenly, 30 grams of graphene are added, and 20 mL of self-made dispersing agent is added simultaneously. The self-made dispersing agent is a mixed solution of polyvinylpyrrolidone (PVP) and sodium lignosulfonate (SLS), and the concentration is 5 g / L, The mass ratio of polyvinylpyrrolidone and sodium lignosulfonate in the mixed solution is 4:1; ultrasonically sonicate for 30-60min in a sonicator, so that graphene and nutshell powder are evenly mixed and uniformly dispersed in the solution, and then mixed The solution was stirred and rea...

Embodiment 2

[0025] A preparation method of a graphene-modified hydrophobic activated carbon, comprising the following steps:

[0026] S1, the hard husk is cleaned, dried, pulverized with a pulverizer, and sieved to obtain husk powder below 200 meshes; the hard husk includes coconut shell, apricot shell, walnut shell, and peach shell.

[0027] S2. Weigh 100 grams of husk powder and 600 mL of ZnCl with a concentration of 0.5 g / mL 2 The -HCl solution is mixed evenly, 20 grams of graphene are added, and 20 mL of self-made dispersant is added simultaneously. The self-made dispersant is a mixed solution of PVP and sodium lignosulfonate (SLS), and the concentration is 5 g / L. The mass ratio of vinylpyrrolidone and sodium lignosulfonate is 4:3; ultrasonically sonicate for 30-60min in an ultrasonic instrument, so that graphene and nutshell powder are mixed and evenly dispersed in the solution, and then the mixed solution is placed at 60-80 The reaction was stirred at °C for 3 h, and the reaction p...

Embodiment 3

[0031] A preparation method of a graphene-modified hydrophobic activated carbon, comprising the following steps:

[0032] S1, the hard husk is cleaned, dried, pulverized with a pulverizer, and sieved to obtain husk powder below 200 meshes; the hard husk includes coconut shell, apricot shell, walnut shell, and peach shell.

[0033] S2. Weigh 100 grams of husk powder and 1000 mL of ZnCl with a concentration of 0.2 g / mL 2 The -HCl solution is mixed evenly, 10 grams of graphene are added, and 10 mL of self-made dispersant is added simultaneously. The self-made dispersant is a mixed solution of PVP and sodium lignosulfonate (SLS), and the concentration is 5 g / L. The mass ratio of vinylpyrrolidone and sodium lignosulfonate is 4:2; ultrasonically sonicate for 30-60min in an ultrasonic machine, so that graphene and nutshell powder are mixed and evenly dispersed in the solution, and then the mixed solution is placed at 60-80 The reaction was stirred at °C for 3 h, and the reaction pro...

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Abstract

The present invention provides a method for preparing a graphene-modified hydrophobic activated carbon, comprising the following steps: mixing nutshell powder with ZnCl 2 The HCl solution is mixed evenly; graphene is added, and a self-made dispersant is added simultaneously, and the self-made dispersant is a mixed aqueous solution of polyvinylpyrrolidone and sodium lignosulfonate, and ultrasonicated for 30-60min in an ultrasonic instrument to make graphene and nutshell The powder is mixed evenly and evenly dispersed in the solution, reacted, dried, then ground, tableted, and carbonized; after carbonization is completed, it is cooled to room temperature, and the sample is washed with distilled water for several times until the product is neutral, and the graphene modification is obtained after drying. of hydrophobic activated carbon. The graphene-modified hydrophobic activated carbon prepared by the preparation method of the present invention has a low water absorption rate and a thermal conductivity of 3-5 times that of ordinary commercial activated carbon.

Description

technical field [0001] The invention relates to a preparation method of graphene-modified hydrophobic activated carbon. Background technique [0002] Activated carbon plays a very important role in the treatment of volatile organic gases (VOCs) and other environmental pollutants due to its developed void structure and huge specific surface area, but there are still some difficult problems in application. During the activation process of ordinary activated carbon, some hydrophilic groups will be generated on the surface of activated carbon, which will cause activated carbon to have a certain degree of hydrophilicity, which will lead to the adsorption of organic pollutants such as VOCs by activated carbon in an environment with high humidity. Ability is greatly reduced. Therefore, it is of great significance to properly improve the hydrophobicity of activated carbon to increase the application range of activated carbon. SUMMARY OF THE INVENTION [0003] The object of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/324C01B32/354B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01J20/20C01B32/324C01B32/348C01B32/354B01D2257/708Y02P20/10
Inventor 谷雪贤黄勇
Owner ZHONGSHAN FLASHLIGHT POLYTECHNIC
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