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Silica-graphene composite and preparation method thereof, and treatment method for removing dye pollutants in water

A composite material and silicon dioxide technology, applied in the field of material science, can solve the problems of poor hydrophilicity and dispersion of graphene, achieve high specific surface area, improve adsorption efficiency, and good adsorption effect

Inactive Publication Date: 2017-01-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a kind of silica-graphene composite material, its preparation method and the treatment method of removing dye pollutants in water, to solve the problem that graphene has poor hydrophilicity and dispersibility in the prior art

Method used

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  • Silica-graphene composite and preparation method thereof, and treatment method for removing dye pollutants in water
  • Silica-graphene composite and preparation method thereof, and treatment method for removing dye pollutants in water
  • Silica-graphene composite and preparation method thereof, and treatment method for removing dye pollutants in water

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preparation example Construction

[0042] In order to solve the above problems, the present invention provides a method for preparing a silica-graphene composite material, which includes the following steps: S1, using a pH regulator to adjust the pH value of water to 8-10 to obtain A solvent system, adding graphene oxide to the above solvent system to obtain a graphene oxide dispersion; S2, performing a sol-gel reaction with ethyl orthosilicate, a hydrolysis solvent and the above graphene oxide dispersion to form a silica-oxidized a graphene composite material; and S3, reducing the silica-graphene oxide composite material to obtain the above-mentioned silica-graphene composite material.

[0043] In the process of preparing the graphene oxide dispersion, the present invention unexpectedly finds that after first adjusting the pH value of water to 8-10 with a pH regulator, and then adding graphene oxide powder into the system, a higher stable graphene oxide dispersion. Through in-depth research on the reasons for...

Embodiment 1

[0059] With 0.5mL 25% NH 3 ·H 2 O adjust the pH of 20mL of water to 9, add 50mg of graphene oxide to the system, and ultrasonicate for 60min to obtain the dispersion liquid mother liquor.

[0060] Mix 8mL of water, 100mg of polyvinylpyrrolidone (PVP) and 2mL of the above dispersion liquid, and stir evenly to obtain a graphene oxide dispersion liquid, wherein the weight ratio of PVP to graphene oxide is 20:1.

[0061] Mix 100 μL tetraethyl orthosilicate, 20 mL ethanol, the above graphene oxide dispersion and 0.1 mL 25% NH 3 ·H 2 O (catalyst) is mixed, carry out sol-gel reaction, after reacting for 24h, form silica-graphene oxide composite material, wherein, the volume ratio of ethanol and water is 2:1, the ratio of graphene oxide and ethyl orthosilicate The dosage ratio is 0.05g / 1mL, and the volume ratio of catalyst to ethyl orthosilicate is 1:1.

[0062] Add 2 mL of 80% hydrazine hydrate to the above-mentioned sol-gel reaction system for reduction reaction, heat and reflux...

Embodiment 2

[0064] With 0.5mL 25% NH 3 ·H 2 O adjust the pH of 20mL of water to 9, add 50mg of graphene oxide to the system, and ultrasonicate for 60min to obtain the dispersion liquid mother liquor.

[0065] 8mL of water, 100mg of PVP and 2mL of the above dispersion were mixed to obtain a graphene oxide dispersion, wherein the weight ratio of PVP to graphene oxide was 20:1.

[0066] Mix 100 μL tetraethyl orthosilicate, 20 mL ethanol, the above graphene oxide dispersion and 0.5 mL 25% NH 3· h 2 O (catalyst) is mixed, carry out sol-gel reaction, after reacting for 24h, form silica-graphene oxide composite material, wherein, the volume ratio of ethanol and water is 2:1, the ratio of graphene oxide and ethyl orthosilicate The dosage ratio is 0.05g / mL, and the volume ratio of catalyst to ethyl orthosilicate is 5:1.

[0067] Add 2 mL of 80% hydrazine hydrate to the above-mentioned sol-gel reaction system for reduction reaction, heat and reflux at 80°C for 2h, centrifuge and wash with water...

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Abstract

The invention provides a silica-graphene composite and a preparation method thereof, and a treatment method for removing dye pollutants in water. The silica-graphene composite has laminated graphene flake structures, and silica is loaded on the laminated graphene flake structures. The silica-graphene composite has advantages of a high specific surface area, good dispersity and good hydrophilicity. Since the silica-graphene composite is a porous laminated structure, and the pi conjugate structure of graphene strongly interacts with pi functional groups in dye molecules, the dye adsorption efficiency of the silica-graphene composite is improved, and thus, the composite exerts good adsorption effect on dye pollutants in water. The composite also has the characteristics of a fast dye pollutant removal rate, great adsorption capability and stable adsorption.

Description

technical field [0001] The invention relates to the field of material science, in particular to a silica-graphene composite material, a preparation method thereof and a treatment method for removing dye pollutants in water. Background technique [0002] In the prior art, silicon alkoxide is mixed with polyvinylpyrrolidone, and a porous silica adsorbent with high adsorption capacity is obtained by sol-gel method, drying, roasting, etc., and the adsorption material has relatively high adsorption capacity and adsorption rate. However, the material disclosed in this invention is only suitable for use in the field of gas drying and purification, and the preparation process of the material requires 3 to 6 hours of high-temperature roasting treatment (400-550 ° C), which is a harsh condition for the preparation process. The requirements are not conducive to the efficient preparation of porous silica adsorbents. [0003] In the field of adsorption, having a high specific surface ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
Inventor 李雯
Owner PETROCHINA CO LTD
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