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Graphene/silicon dioxide-polypyrrole composite material as well as preparation method and application thereof

A technology of silica and composite materials, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of limited application and loss of specific surface area, and achieve low investment and increased The effect of low specific surface area and equipment requirements

Inactive Publication Date: 2017-12-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an emerging material, graphene has a huge specific surface area, but the stacking and agglomeration between nanolayers makes graphene lose most of its specific surface area, which limits the application of graphene as an adsorbent in water pollution treatment

Method used

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  • Graphene/silicon dioxide-polypyrrole composite material as well as preparation method and application thereof
  • Graphene/silicon dioxide-polypyrrole composite material as well as preparation method and application thereof
  • Graphene/silicon dioxide-polypyrrole composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Dissolve 0.6 g of graphite oxide solid in 500 mL of deionized water, add 5 g of cetyltrimethylammonium bromide and 0.4 g of sodium hydroxide, and sonicate for 3 h to obtain a modified graphene oxide suspension;

[0044] In this example, graphite oxide was prepared by the modified Hummers method. The specific steps are: take 120 mL of 98 wt% concentrated sulfuric acid in a beaker, and place it in an ice-water bath for electric stirring. When the temperature drops below 4 °C, add 5 g Graphite and 2.5 g of sodium nitrate, continue to stir for 1 h, then add 15 g of potassium permanganate, keep the temperature of the reaction system not exceeding 10 °C, continue to react for 2 h; transfer the beaker to a constant temperature water bath at 35 °C, and continue to stir for reaction 2 h; add 230 mL of deionized water to the beaker, and then control the temperature of the solution below 98 °C, continue the reaction for 30 min, then add 30 mL of 30 wt% hydrogen peroxide solutio...

Embodiment 2

[0057] (1) Dissolve 0.1 g of the graphene / silica composite material prepared in step (3) of Example 1 in 143 mL of deionized water. After ultrasonic treatment for 2.5 h, transfer to an ice-water bath at 0 °C, and add 0.4 g of pyrrole , after stirring for 2 h, add 25 mL, 0.2 g / mL ammonium persulfate solution dropwise, continue stirring for 11 h in ice bath at 0 °C, then add 10 mL of acetone to obtain a black precipitate;

[0058] (2) The black precipitate obtained in step (1) was filtered and washed with deionization and 500 mL of acetone respectively, then dried in an oven at 65 °C for 12 h, ground, and passed through a 60-mesh sieve to obtain graphene / dioxide Silicon-polypyrrole composite (GS-PPy).

[0059] The microstructure, X-ray diffraction and X-ray photoelectron energy spectrum of graphene / silica-polypyrrole composite material in the present embodiment are similar to the graphene / silica-polypyrrole composite material of embodiment 1, illustrate this implementation In t...

Embodiment 3

[0066] (1) Dissolve 0.1 g of the graphene / silica composite material prepared in step (3) of Example 1 in 100 mL of deionized water, after ultrasonic treatment for 4 h, transfer to an ice-water bath at 0 °C, and add 0.7 g of pyrrole , after stirring for 3 h, add 35 mL, 0.3 g / mL ammonium persulfate solution dropwise, continue stirring for 14 h in ice bath at 0 °C, then add 10 mL of acetone to obtain a black precipitate;

[0067] (2) The black precipitate obtained in step (1) was filtered and washed with deionization and 500 mL of acetone respectively, then dried in an oven at 80 °C for 12 h, ground, and passed through a 60-mesh sieve to obtain graphene / dioxide Silicon-polypyrrole composite (GS-PPy).

[0068] The microstructure, X-ray diffraction and X-ray photoelectron energy spectrum of graphene / silica-polypyrrole composite material in the present embodiment are similar to the graphene / silica-polypyrrole composite material of embodiment 1, illustrate this implementation In the...

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Abstract

The invention discloses a graphene / silicon dioxide-polypyrrole composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, adding a graphene / silicon dioxide composite material into water for carrying out ultrasonic treatment to obtain a graphene / silicon dioxide solution; secondly, transferring the graphene / silicon dioxide solution to an ice-bath condition, and then adding pyrrole for stirring to obtain a mixed solution; thirdly, adding an ammonium persulfate solution into the mixed solution obtained in the second step, and stirring under the ice-bath condition to obtain a black precipitate; fourthly, carrying out suction filtration, washing, drying, grinding and sieving on the black precipitate obtained in the third step, thus obtaining the graphene / silicon dioxide-polypyrrole composite material. The graphene / silicon dioxide-polypyrrole composite material disclosed by the invention can be used as an adsorbent in the field of water pollution control, especially for removing hexavalent chromium in the wastewater; in addition, the graphene / silicon dioxide-polypyrrole composite material has the advantages of simple preparation method, high adsorption capacity and capability of reducing the hexavalent chromium into trivalent chromium.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a graphene / silicon dioxide-polypyrrole composite material and its preparation method and application. Background technique [0002] With the continuous development of industry, a large amount of industrial wastewater is discharged into natural water bodies, causing water pollution, which not only aggravates the shortage of water resources in China but also endangers the ecological environment and human health. Due to the characteristics of high toxicity, non-degradability and accumulation of heavy metals, heavy metal pollution in water has been widely concerned. A large amount of heavy metal wastewater is produced globally every year, and millions of tons of heavy metals are discharged into the environment. As a kind of heavy metal, hexavalent chromium is widely used in electroplating, smelting, metal processing and other industries. Excessive intake of hexavale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/103B01J20/205B01J20/262B01J20/28C02F1/288C02F2101/22
Inventor 罗汉金方伟江鲜英
Owner SOUTH CHINA UNIV OF TECH
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