The Preparation Of Graphene Oxide-based Aerogel And Its Application In The Treatment Of Oily Wastewater

With the development of industry,the demand for chemical oil development,refining and transportation has increased,and various refining oils have also been widely used,resulting in a large amount of oil products entering rivers and waterways and causing damage to aquatic resources,which deteriorated the living environment and had an impact on human survival and health.The demand for effectively reducing and preventing such pollution is also increasing,and reducing oil pollution has become a hot issue in research.Compared with other conventional methods for oily wastewater treatment,the adsorption method has a good treatment effect and a wide range of applications,and is therefore widely used to treat oily wastewater.Herein,three graphene-based aerogel materials were prepared by hydrothermal method and sol-gel method to adsorb and separate of oily wastewater,using graphene oxide as matrix,loading functionalized nanomaterials and metal oxides,The main contents are as follows:?1?An ultra-light and highly compressible,super-lipophilic,hydrophobic graphene aerogel?GA?was prepared by hydrothermal reduction.The results showed that the contact angles of water and oil were 130°and 0°and the mechanical compression ratio was over 70%,with good thermal stability from 0 to 900°C.The oily wastewater was simulated by chloroform,methanol and DMF.The adsorption capacity of GA to chloroform was 149 g/g,while the adsorption amount of methanol and DMF was over 60 g/g,and the cycle stability was good.?2?In order to improve the specific surface area and electrocatalytic activity of the aerogel,the nanomaterial tungsten carbide was introduced,and the tungsten carbide/graphene composite aerogel material?WC-GA?was prepared by sol-gel method.The results showed that WC-GA had a specific surface area of 895 m²/g and a pore size distribution of 4 nm.The contact angles of water contact angle and chloroform were 125°and 0°,respectively.The adsorption amount of WC-GA for various simulated oily wastewater was 100²25 g.After 10 cycles of repeated extrusion,it can still be stable at 100 g/g.Moreover,under the action of the external force,the original shape can be restored to 100%and the thermal stability was good.At the same time,the composite material had good electrocatalytic activity in acidic environment,and has potential application value for catalytic degradation of oily wastewater.?3?In order to improve the thermal stability and electrical conductivity of the material,the surface properties and morphology of WC-GA were modified by adding alumina to prepare alumina/tungsten carbide/graphene composite aerogel?Al₂O₃-WC-GA?.The effects of different proportions of aluminum chloride on the wetting properties of multifunctional aerogels and the effect of different ratios of alcohol to water on gelation time were investigated.The results showed that Al₂O₃-WC-GA had no obvious weight loss before 510°C,and the electrical resistance was small and the electrical conductivity was good.At the same time,the wettability,chemical composition and morphology of the composites were characterized,and the adsorption properties and thermal stability were analyzed.Chloroform,DMF,THF and acetone were used to simulate the oily wastewater.The adsorption amount of chloroform was the highest,reaching 178 g/g,and the other adsorption amounts were stable between 80 and 118 g/g.