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Why develop the graphene based sponge oil water separator

Oily wastewater, oil spill from the petroleum industry, and oil-shipping accidents have caused detrimental effects on aquatic ecosystems. Several methods to tackle oil spillage cleanups include absorption, dispersants, solidifiers, and controlled burning. Absorption is one of the most commonly used method in the separation and recovery of spilled oil from water because of its good efficiency, simple operation, and flexibility to combine with other methods.

Graphene has a large surface area, with a high chemical and thermal stability. It is an excellent adsorption material and has several applications in the field of oil spill cleanup and water purification processes.Based on several studies, three-dimensional (3D) porous sponges are very promising high-capacity absorbents owing to their large surface area.

However, most of the commercially available sponges are poorly hydrophobic, which limits their application for oil spill cleanup and recovery. Thus, surface modification is a necessity to increase the hydrophobicity and lipophilicity. Sponges are usually coated with graphene, carbon nanotubes, polypyrrole, polyaniline nanofibers, and nanocrystals to improve their superoleophilicity and superhydrophobicity . The graphene based sponge exhibits high absorption capacities for several types of oils owing to its high surface area.

MstnLand developed the oil water separator which used the oilphilicity and hydrophobicity of graphene to improve the properties of conventional adsorbent materials, The adsorption material can absorb oil and do not absorb water, so as to effectively remove oil slick, dispersed oil, dissolved oil and part of soluble organic solvent in the water, to achieve the purpose of oil and water separation.The application field can be widely used in oil refining, petrochemical, metallurgy, cement, coal, and processing oily sewage in printing and dyeing, paper making, leather, textile, baking, frozen food and other industries.

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