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Preparation method of graphene-mesoporous silica aerogel

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

Active Publication Date: 2015-08-12
SUIHUA UNIV
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  • 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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  • Preparation method of graphene-mesoporous silica aerogel
  • Preparation method of graphene-mesoporous silica aerogel
  • Preparation method of graphene-mesoporous silica aerogel

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preparation example Construction

[0033] The preparation of a kind of graphene-mesoporous silica airgel is carried out as follows:

[0034] One, adopt improved Hummer's method, take graphite as raw material, prepare graphite oxide: the reactor that will be equipped with concentrated sulfuric acid and concentrated phosphoric acid (volume ratio 2: 1~15: 1) is placed in ice-water bath, is cooled to 0 ℃. Add 1g of graphite powder, slowly add 3g of KMnO with vigorous stirring 4 , keep the system temperature not exceeding 20°C for 1h. Transfer it to a water bath at 35-45°C for 30 minutes. 46 mL of deionized water was gradually added, the temperature was raised to 98°C and the reaction was continued for 40 min, and the mixture changed from brown to bright yellow. With 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- Finally, continue to wash with deionized water until the f...

Embodiment 1

[0044] a. Synthesis of graphite oxide

[0045] The reactor containing 20.7ml of concentrated sulfuric acid and 2.3ml of concentrated phosphoric acid was placed in an ice-water bath and cooled to 0°C. Add 1g of graphite powder, slowly add 3g of KMnO with vigorous stirring 4 , keep the system temperature not exceeding 20°C for 1h. Transfer it to a water bath at 35-45°C for 30 minutes. 46 mL of deionized water was gradually added, the temperature was raised to 98°C and the reaction was continued for 40 min, and the mixture changed from brown to bright yellow. With 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- Finally, 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...

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 of graphite powder, slowly add 3g of KMnO with vigorous stirring 4 , keep the system temperature not exceeding 20°C for 1h. Transfer it to a water bath at 35-45°C for 30 minutes. 46 mL of deionized water was gradually added, the temperature was raised to 98°C and the reaction was continued for 40 min, and the mixture changed from brown to bright yellow. With 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- Finally, 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, a...

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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 airgel. Background technique [0002] Mesoporous silica materials have the advantages of stable chemical properties, large specific surface area, wide range of pore structure distribution and large-scale production, and can be used as adsorbents for sewage treatment. However, pure silica mesoporous materials do not have active centers, the adsorption capacity is not high, and the adsorption rate is slow, which limits their wide application in this field. Therefore, research on the functionalization of mesoporous silica materials and the preparation of composite mesoporous silica materials has attracted much attention. [0003] Chinese patent CN201010167801.9 provides a method for preparing carboxylated MCM-41 mesoporous molecular sieves for adsorbing heavy metal ions. This patent uses calcined ...

Claims

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Application Information

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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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