Material with super-oleophobicity under water and super-hydrophobicity under oil for oil-water emulsion separation and solvent-free preparation method thereof

Abstract

The invention discloses a fibrous membrane with super-oleophobicity under water and super-hydrophobicity under oil for oil-water emulsion separation prepared by a solvent-free method. The method is characterized in that nano silica adsorbs Fe<3+> and then is assembled onto the surface of filter paper fibers, and then polypyrrole is deposited by gaseous polymerization. The obtained filter paper fibrous membrane has the functions of super-oleophobicity (OCA=165 degrees) under water and super-hydrophobicity (OCA=159 degrees) under oil, water-in-oil and oil-in-water microemulsions can be separated only under the action of gravity, the separation efficiency is 99%, and the flow rate is 300 L / m<2> / h. The method has the advantages that raw materials are cheap and easy to obtain, the preparation conditions are mild, and the gaseous polymerization not only avoids the use of solvent, but also uses fewer raw materials. In addition, the material is good in durability and can be recycled; the disadvantages that an existing filtered demulsification net membrane can only separate one type of oil-water emulsion and is poor in stability are overcome. The super-lyophobic fibrous membrane has broad application prospects in the fields of oil-water separation, especially emulsion separation, oil-containing sewage treatment and the like.

Description

technical field

[0001] The invention describes a solvent-free preparation of underwater super-oleophobic / sub-oil super-hydrophobic fiber membranes for oil-water emulsion separation, which belongs to the technical field of functional materials. Background technique

[0002] With the exploitation of offshore oil and the leakage of oil products during oil transportation, marine ecological disasters are caused, and a large amount of oily wastewater is produced in the process of industrial production, which not only leads to energy waste, but also causes great harm to human health and the ecological environment. , oil-water separation has become a global problem of widespread concern. Compared with the phase-separated oil-water mixture, the emulsified oil-water mixture has a small particle size (< 20 μm), the oil-water interface is stable, and it is difficult to coalesce, so it is difficult to effectively separate through the traditional gravity method. Milk and other methods...

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