Three-dimensional modified graphene aerogel and preparation method thereof and application in water treatment

Abstract

The invention discloses three-dimensional modified graphene aerogel and a preparation method thereof and an application in water treatment. The preparation method comprises the following steps: (1) enabling a precursor of h-CN to be placed in a crucible, capping and calcining in an air atmosphere, setting calcining temperature and time, and naturally cooling to a room temperature, to obtain faintyellow powder; weighing the faint yellow powder obtained by calcining, adding alkaline solution, ultrasonic-dispersing, and placing in a water bath, heating and stirring; and after the reaction, afterwashing a milk white substance obtained by centrifuging the solution in a high speed, freeze-drying an obtained precipitate, to obtain h-CN nanowire powder; and (2) using graphene oxide aqueous dispersion as a precursor, and using the h-CN nanowire powder as a nitrogen doping agent, preparing three-dimensional h-CN / GO hydrogel through a hydrothermal method; and reducing the three-dimensional h-CN / GO hydrogel by using a reducing agent, to obtain the three-dimensional h-CN / r-GO composite aerogel. The prepared graphene aerogel is large in specific surface area, large in pore volume, and excellent in pore channel structure, has strong adsorbability, and is capable of achieving rapid and efficient selective adsorption to polarity and non-polarity organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of environmental photothermal nanomaterials and water treatment, and specifically relates to the preparation of a novel three-dimensional modified graphene airgel and its environment-friendly and efficient water treatment application. Background technique [0002] With the rapid development of industry, high-salinity water is considered to be a major difficulty in water treatment due to its salinity (salinity higher than 5%), toxic and biodegradable properties. For this type of wastewater, methods such as evaporation concentration, biological treatment and incineration are mainly used now. For example, the Chinese invention patent application of CN 109879507A discloses a process for resource utilization of coking high-salt wastewater. Evaporation, incineration, flue gas treatment, dissolution and removal of mixed salt, freezing and salt separation, two-stage evaporation and other steps were carried out. How...

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Problems solved by technology

As a clean and sustainable energy source, solar energy can be used as an energy source for the desalination of high-salinity water bodies. In recent years, the concept of interface-type photo-steam conversion has been proposed, and its photo-steam conversion efficiency can reach 80%, which improves the desalination of high-salinity water bodies by solar energy. There are problems such as high heat loss and low efficiency of light-to-heat conversion during collective heating, but this process is still limited by the optical absorption of the material itself, water transportation, etc.; and high-salt wastewater contains many toxic, difficult to biodegrade, volatile The organic pollutants in the photothermal evaporation process may be accompanied by water evaporation and cause secondary pollution

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