A kind of peanut shell graphene composite airgel oil-absorbing material and preparation method thereof

Abstract

The invention relates to a peanut shell graphene composite airgel oil-absorbing material and a preparation method thereof. The composite airgel uses peanut shells and graphite oxide as raw materials, uses thiourea as a crosslinking agent, and passes thiourea under high temperature and high pressure The generated gas separates the graphene sheets and forms a three-dimensional porous structure with the peanut shell. The present invention utilizes thiourea to generate gas under high temperature and high pressure through a hydrothermal method to help the sheet separation of graphene oxide, and at the same time, functional groups are modified on the surface of graphene sheet, so that it can be better combined with peanut shell powder and interact with each other. The three-dimensional porous network structure is formed by the action. The three-dimensional porous network structure has high toughness and high strength, and it is not easy to break even after saturated adsorption. The peanut shell further expands the pores of graphene, increases the specific surface area of ​​the material, and greatly enhances the oil absorption capacity.

Description

technical field [0001] The invention relates to a peanut shell graphene composite airgel oil-absorbing material and a preparation method thereof, belonging to the technical fields of chemistry and environment. Background technique [0002] The pollution caused by oily waste water, waste liquid, and offshore oil spills has caused damage to the living conditions of the earth's organisms. Oil film pollution will cause serious damage to aquatic organisms. The oil film prevents oxygen from entering the water body, making the water body anoxic, and oil Washing up on the beach can also have a serious impact on the surrounding creatures. This just forces the mankind to urgently need to develop a large amount of excellent oil-absorbing materials. [0003] Good oil slick absorbent material, with hydrophobicity and lipophilicity, high oil absorption, low cost and stable floating on the water surface, but traditional oil absorbent materials have various problems: such as low oil absorp...

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Problems solved by technology

[0003] Good oil slick absorbent material, with hydrophobicity and lipophilicity, high oil absorption, low cost and stable floating on the water surface, but traditional oil absorbent materials have various problems: such as low oil absorption capacity, high material cost, buoyancy properties Poor, absorbs oil as well as water

However, the construction of three-dimensional graphene structures only relies on weak electrostatic interactions, hydrogen bonds, or π-π bonds between graphene sheets. It is difficult to achieve high mechanical properties of three-dimensional graphene structures, and the mechanical strength is low. broken

[0005] Chinese patent document CN104998589A discloses a preparation method of high-efficiency oil-absorbing carbon airgel material. In this invention, carbon nanotubes are first dispersed in a dispersion liquid containing ethanol and surfactants, and then self-treated with highly dispersed graphene oxide. Assembled, the obtained three-dimensional graphene-carbon nanotube composite material, although the composite material solves the problem of uneven dispersion of carbon nanotubes, it is relatively brittle after saturated adsorption, has low strength and is easy to break

Cellulose and hemicellulose are high-molecular polymers composed of sugar units connected by glycosidic bonds. They contain many hydrophilic oxygen-containing functional groups, have good flexibility and excellent mechanical properties. At present, peanut shells, except for a small part Except for feed, most of them are thrown away and burned, causing great waste of resources and environmental pollution

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