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Graphene oxide composite aerogel and preparation method and application thereof

A graphene composite and aerogel technology, applied in chemical instruments and methods, oxidized water/sewage treatment, chemical/physical processes, etc., can solve the problem of low CODcr removal rate, low ozone yield, and utilization rate of papermaking wastewater. Low and other problems, to achieve the effect of improving the utilization rate of ozone, improving the adsorption effect, and high utilization rate

Inactive Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high selectivity of the oxidation activity of ozone molecules, it is difficult to completely mineralize the refractory macromolecular organic matter in papermaking wastewater into CO in the process of water treatment. 2 and H 2 o
Moreover, the yield of ozone is not high, and the low utilization rate makes the cost of ozone oxidation treatment higher
In addition, the single ozone oxidation process still has the problem of low CODcr removal rate for papermaking wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of graphene oxide composite airgel of the present embodiment, concrete preparation steps are as follows:

[0040] (1) Dispersion: the graphene oxide powder was mixed with distilled water, the solid-to-liquid ratio was 1:2, and ultrasonic dispersion was performed for 0.5 hours to obtain a graphene oxide aqueous solution;

[0041] (2) MnO 2 The addition of: add nanoscale MnO in the graphene oxide aqueous solution in step (1) 2 Solid powder, added in an amount of 5.0% of the absolute dry mass of graphene oxide powder, stirred while adding, and the temperature of the adding process was controlled at 20°C;

[0042] (3) Hydrothermal treatment: Take 100 ml of the reaction suspension obtained in step (2) and put it into a reaction kettle with a temperature of 80° C. and a pressure of 0.2 MPa to react for 2 hours. After the reaction is stopped, the solution is cooled to room temperature, filtered and washed with deionized water, and dried;

[0043...

Embodiment 2

[0047] A kind of preparation method of graphene oxide composite airgel of the present embodiment, concrete preparation steps are as follows:

[0048] (1) Dispersion: mix the graphene oxide powder with distilled water, the solid-to-liquid ratio is 1:3, and carry out ultrasonic dispersion treatment for 1.0 hour to obtain the graphene oxide aqueous solution;

[0049] (2) MnO 2 The addition of: add nanoscale MnO in the graphene oxide aqueous solution in step (1) 2 Solid powder, added in an amount of 6.0% of the absolute dry mass of graphene oxide powder, stirred while adding, and the temperature of the adding process was controlled at 25°C;

[0050] (3) Hydrothermal treatment: 100 ml of the reaction suspension obtained in step (2) was put into a reaction kettle with a temperature of 90° C. and a pressure of 0.3 MPa to react for 6 hours. After the reaction is stopped, the solution is cooled to room temperature, filtered and washed with deionized water, and dried;

[0051] (4) So...

Embodiment 3

[0055] A kind of preparation method of graphene oxide composite airgel of the present embodiment, concrete preparation steps are as follows:

[0056] (1) Dispersion: the graphene oxide powder was mixed with distilled water, the solid-to-liquid ratio was 1:4, and ultrasonic dispersion was performed for 1.5 hours to obtain a graphene oxide aqueous solution;

[0057] (2) MnO 2 The addition of: add nanoscale MnO in the graphene oxide aqueous solution in step (1) 2 Solid powder, added in an amount of 6.0% of the absolute dry mass of the graphene oxide powder, stirred while adding, and the temperature of the adding process was controlled at 30°C;

[0058] (3) Hydrothermal treatment: Take 100 ml of the reaction suspension obtained in step (2) and put it into a reaction kettle with a temperature of 100° C. and a pressure of 0.4 MPa to react for 10 h. After the reaction is stopped, the solution is cooled to room temperature, filtered and washed with deionized water, and dried;

[00...

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Abstract

The present invention belongs to the field of porous catalyst materials, and specifically discloses a graphene oxide composite aerogel and a preparation method and application thereof. The preparation method is as follows: mixing graphene oxide powder and water in solid-liquid ratio of 1: 2 to 1: 6 for ultrasonic dispersion; under stirring conditions, adding nanoscale MnO2 powder, performing hydrothermal reaction, after the reaction is stopped, cooling to room temperature, filtering, washing a filter cake with water, and drying; placing an obtained solid material in an alcohol solution for substitution reaction to obtain a graphene oxide composite hydrogel; finally freeze-drying the graphene oxide hydrogel, and then cooling to obtain the graphene oxide composite aerogel. The catalyst preparation method is simple and easy to operate, the graphene oxide composite aerogel is high in stability, and the catalytic ozonation treatment effect of the graphene oxide composite aerogel is good, and an effective method is provided for advanced treatment of papermaking wastewater.

Description

technical field [0001] The invention belongs to the field of porous material catalysts, and in particular relates to a graphene oxide composite airgel and a preparation method and application thereof. Background technique [0002] Airgel is a three-dimensional porous amorphous solid material composed of nano-scale colloidal particles or polymer molecules, which has the characteristics of low density, high specific surface area and high porosity. Due to the above unique characteristics of airgel, it has applications in many fields, such as catalysts and their carriers, adsorption, capacitors, etc. [0003] Graphene oxide is a derivative of graphene with a unit sub-layer thickness, and is usually used as a precursor for the preparation of graphene and its composite materials. There are a large number of covalent bonds in the plane and on the boundary of graphene oxide. Oxygen functional groups have recently become one of the research hotspots due to their own unique propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10C02F1/78C02F103/28
CPCC02F1/725C02F1/78B01J23/34C02F2103/28B01J35/23B01J35/617B01J35/66
Inventor 杨仁党程峥张优茂
Owner SOUTH CHINA UNIV OF TECH
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