Fabrication And Performance Of Graphene-Based Oil Adsorbing Materials

In the past few decades,several oil spills have occurred.Great damages has been caused to the societies,environment,economy,human health and marine resources because of the oil spills and organic pollution.There are a series of problems,such as scientific barriers,economic costs,and difficulty of operation,and removal rate in traditional remedial measures that cannot be solved completely and fully.Therefore,it is imperative to look for an effective method for developing and processing oil spill pollution.In many treatment methods,adsorption is a relatively flexible,low-cost,controllable and efficient treatment approach.Traditional adsorption materials have such drawbacks,and they cannot fully meet the rapid development of society.Therefore,it is particularly important to develop high-tech oil-absorbing materials.Graphene is the hot interests of materials science in recent years.Due to its inherent hydrophobicity and flexibility of two-dimensional structure,it can well build low-density hydrophobic three-dimensional structures and applied in oil adsorption.We succeeded in blending and dispersing L-tyrosine and graphene oxide with the assistance of pH co-solvent,and synthesized a graphene aerogel with selective adsorption capacity by hydrothermal method.When graphene aerogel was used as an adsorbent,it had a very low density of 8.341 mg ml^-1,a high specific surface area of300.4 m² g^-1,and good mechanical strength.Even no deliberately pursue super hydrophobicity,the material's adsorption capacity still reaches 86.5 g g^-1 for various oils.Graphene oxide was used as a precursor,tri-block copolymer P123 was used as a soft template,and a porous carbon gel with a relatively uniform pore size was synthesized.The content of the templating agent in the system was further screened to obtain an optimal ratio of 80%.The pore size of the carbon gel obtained under the joint action of the template and vacuum drying is relatively uniform and controllable.When the carbon gel is used as an oil absorbing material,the adsorption capacity for the oil is about 81.3 g g^-1,and the adsorption capacity for methylene blue is as high as 340.81mg g^-1.The prepared carbon gel rVGA1.4 conforms to the Freundlich adsorption model and pseudo-secondary kinetic model.