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A kind of preparation method of graphene mesoporous silica airgel

A technology of mesoporous silica and silica, applied in chemical instruments and methods, colloidal chemistry, colloidal chemistry, etc., can solve problems such as difficult separation, reduce specific surface area, etc., and achieve improved selective absorption, simple process, and cost. low cost effect

Active Publication Date: 2017-09-29
SUIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphene is an ideal adsorbent, it is often combined with other adsorbent materials in practical applications because the sheet structure of graphene is easy to re-aggregate to form graphite, which reduces the specific surface area and is difficult to separate from the solution after adsorption. complex

Method used

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  • A kind of preparation method of graphene mesoporous silica airgel
  • A kind of preparation method of graphene mesoporous silica airgel
  • A kind of preparation method of graphene mesoporous silica airgel

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preparation example Construction

[0033] The preparation of a graphene-mesoporous silica aerogel is carried out according to the following steps:

[0034] 1. Using the improved Hummer’s method to prepare graphite oxide using graphite as raw material: Place a reactor containing concentrated sulfuric acid and concentrated phosphoric acid (volume ratio 2:1-15:1) in an ice-water bath and cool to 0°C. Add 1g graphite powder, slowly add 3g KMnO while stirring vigorously 4 , Keep the system temperature no more than 20℃ and react for 1h. Transfer it to 35~45℃ water bath for 30min. 46 mL of deionized water was gradually added, and the temperature was increased to 98° C. and the reaction was continued for 40 minutes. The mixture turned from brown to bright yellow. Use 140ml deionized water and 30% H 2 O 2 Solution treatment, neutralize unreacted potassium permanganate, wash the filter cake repeatedly with dilute HCl until the filtrate is free of SO 4 2- Then, continue to wash with deionized water until the filtrate is nea...

Embodiment 1

[0044] a. Synthesis of graphite oxide

[0045] The reactor containing 20.7 ml of concentrated sulfuric acid and 2.3 ml of concentrated phosphoric acid was placed in an ice water bath and cooled to 0°C. Add 1g graphite powder, slowly add 3g KMnO while stirring vigorously 4 , Keep the system temperature no more than 20℃ and react for 1h. Transfer it to 35~45℃ water bath for 30min. 46mL of deionized water was gradually added, the temperature was increased to 98°C and the reaction was continued for 40 minutes, and the mixture changed from brown to bright yellow. Use 140ml deionized water and 30% H 2 O 2 Solution treatment, neutralize unreacted potassium permanganate, wash the filter cake repeatedly with dilute HCl until the filtrate is free of SO 4 2- After that, continue to wash with deionized water until the filtrate is nearly neutral, and dry to obtain graphite oxide.

[0046] b. Preparation of graphene oxide solution

[0047] Take 200 mg of graphite oxide and grind it, add 100 mL ...

Embodiment 2

[0054] a. Synthesis of graphite oxide

[0055] The reactor containing 28.1 ml of concentrated sulfuric acid and 1.9 ml of concentrated phosphoric acid was placed in an ice water bath and cooled to 0°C. Add 1g graphite powder, slowly add 3g KMnO while stirring vigorously 4 , Keep the system temperature no more than 20℃ and react for 1h. Transfer it to 35~45℃ water bath for 30min. 46mL of deionized water was gradually added, the temperature was increased to 98°C and the reaction was continued for 40 minutes, and the mixture changed from brown to bright yellow. Use 140ml deionized water and 30% H 2 O 2 Solution treatment, neutralize unreacted potassium permanganate, wash the filter cake repeatedly with dilute HCl until the filtrate is free of SO 4 2- After that, continue to wash with deionized water until the filtrate is nearly neutral, and dry to obtain graphite oxide.

[0056] b. Preparation of graphene oxide solution

[0057] Take 100 mg of graphite oxide and grind it, add 100 mL ...

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Abstract

The invention discloses a preparation method of graphene-mesoporous silica aerogel. The preparation method comprises graphite oxide synthesis, graphene oxide solution preparation, graphene-silica gel preparation, and graphene-mesoporous silica aerogel preparation. The preparation method combines excellent mesoporous structure characteristics of mesoporous silica and hydrophobicity of graphene and prepares the novel environmentally friendly adsorption material with high sewage heavy metal ion and organic pollutant selective adsorbability. Through mesoporous silica, graphene aggregation is inhibited and a high specific surface area is kept. Through graphene, mesoporous silica is uniformly dispersed and mesoporous silica stability is kept. The graphene-mesoporous silica aerogel has high composite material adsorption capability and can be easily separated from the solution after adsorption. The preparation method has simple processes. The graphene-mesoporous silica aerogel has characteristics of graphene and mesoporous silica.

Description

Technical field [0001] The invention relates to the technical field of mesoporous materials and their preparation, in particular to a method for preparing graphene-mesoporous silica aerogel. Background technique [0002] Mesoporous silica material has the advantages of stable chemical properties, large specific surface area, wide pore structure distribution range and large-scale production. It can be used as an adsorbent for sewage treatment. However, the pure silica mesoporous material itself does not have active centers, the adsorption capacity is not high, and the adsorption rate is slow, which limits its wide application in this field. Therefore, researches on the functionalization of mesoporous silica materials and the preparation of composite mesoporous silica materials have attracted much attention. [0003] Chinese patent CN201010167801.9 provides a method for preparing carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions. The patent uses calcined...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01J13/00
Inventor 田军迟彩霞佟良乔秀丽
Owner SUIHUA UNIV
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