A kind of preparation method of high specific surface area graphene-metal oxide composite sponge

Abstract

The invention discloses a method for preparing a graphene-metal oxide composite sponge with a high specific surface area. The composite sponge is a graphene oxide-metal oxide-graphene composite sponge with a high specific surface area. The preparation method comprises the following steps: The first step: take the aqueous solution of graphene oxide and ultrasonically disperse to obtain a uniform dispersion of graphene oxide; then add metal oxide to the above graphene oxide dispersion and ultrasonically disperse; then add graphene to graphene oxide / metal oxide Stirring at room temperature to obtain a uniform dispersion of graphene oxide / metal oxide / graphene; finally, fully immerse the commercial hydrophilic sponge in it, and take it out and dry it after the adsorption is saturated. The composite porous sponge has high specific surface area, strong adsorption capacity, strong catalytic degradation function, and will not cause secondary pollution during use. The preparation method is simple, easy to operate, and cost-effective, and is very suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation technology of graphene oxide-metal oxide-graphene composite sponge with high specific surface area, and belongs to the technical field of controllable continuous synthesis of graphene-based composite materials. Background technique [0002] Graphene has received more and more attention due to its excellent properties such as force, heat, electricity, and light. At present, countries all over the world are accelerating the commercialization of graphene. In the process of research and commercialization, graphene three-dimensional materials have gradually become a research hotspot due to its wide application. Graphene films can be used for transparent conductive electrodes (Scientific Reports, 2013, 3, article number: 2714(1-7)) and the like. These three-dimensional graphene materials can be easily integrated into existing application systems, so that they can be applied quickly. In particular, three-dimensional gr...

AI Technical Summary

Problems solved by technology

However, a number of studies have shown that there are three main problems before the application of graphene-based three-dimensional catalytic materials: first, the mass production technology of graphene porous materials; second, the simple and controllable preparation technology of specific surface area; third, , Separation of adsorption and degradation functions of graphene-based three-dimensional porous materials for gas or water pollutants

For the first question, the current preparation methods of graphene porous materials mainly include freeze-drying and supercritical drying. The process is very unsuitable for industrial production

In order to avoid the disadvantages of the two processes, researchers at Harbin Institute of Technology adopted the strategy of freezing first and then replacing water with a volatile solvent to prepare graphene porous materials. Although this method avoids the time-consuming process of freezing sublimation, it requires freezing and long-term Solvent displacement, so large-scale production is also impractical

For the second question, in the existing preparation methods, the control of the specific surface area is rarely mentioned, even if there is, it is based on the freezing temperature of freeze-drying, the process is complicated, and it is not suitable for mass production

For the third question, the existing research either emphasizes the super adsorption capacity of graphene-based three-dimensional porous materials, or emphasizes its super high catalytic effect, and rarely mentions the high performance of both.

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