Xinjiang Institute of Physics and Chemistry obtains superhydrophobic graphene foam material for oil-water separation
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The new two-dimensional carbon material-graphene is a basic unit that constitutes other graphite materials, particularly a three-dimensional structural material composed of it as a basic unit, having a rich pore, a high specific surface area, and a hydrophobic and oleophilic character. As a basic feature of oil and water separation adsorbent. At the same time, a stable, interconnected pore structure and high surface chemical activity are conducive to the improvement of the recycling performance of the material in the oil-water separation process. Therefore, three-dimensional graphene is gradually emerging as a new type of oil-water separation material in scientific research fields.
The surface infiltration characteristics of the oil-water separation material directly affect the selectivity of the oil-water separation material to water and oil. Because the graphene oxide precursor used in the preparation of the graphene foam surface has a large number of oxygen-containing functional groups, after treatment by chemical methods, etc. To a certain extent, its hydrophobicity is increased, but it has no superhydrophobic property (water contact angle is greater than 150°), so that the material loses its oil-water selectivity.
Recently, scientists from the Composite Materials Research Team of the Environmental Science and Technology Research Institute of the Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences have designed super-hydrophobic graphene foam materials for oil-water separation by adjusting the material surface roughness and surface energy. Researchers used graphene oxide to achieve good moldability. Using suction filtration technology, graphene oxide films were first prepared. By using foaming technology, graphene foams with certain functional groups on the surface were prepared by controlling the reaction time, and then on the surface. Uniformly loaded silica nanoparticles were modified by silane to prepare a graphene foam material with superhydrophobic character for oil-water separation. The water contact angle was 153°, which improved the oil-water selectivity of the material while maintaining The three-dimensional structure of graphene foam has good adsorption properties for oils and organic solvents. In addition, during the preparation process, researchers controlled the thickness of ultra-hydrophobic graphene foam by adjusting the amount of graphene oxide. The material can also be used as an oil-water separation membrane. Since the material has very good hydrophobic properties, the separation efficiency of the material in the oil-water separation process has been significantly improved. Therefore, the material can be used as an adsorbent material, and can also be used as a filter film material, further broadening the scope of use of the graphene foam material.
The relevant research results were published in the Journal of Colloid and Interface Science, and related research work was funded by the National Natural Science Foundation of China.
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