Super-hydrophilic conductive nanofiber membrane and method for treating emulsion by using super-hydrophilic conductive nanofiber membrane

Abstract

The invention discloses a super-hydrophilic conductive nanofiber membrane and a method for treating emulsion by using the super-hydrophilic conductive nanofiber membrane, and relates to the field of oil-water separation. Polyacrylonitrile is dissolved in an N, N-dimethylformamide solution containing a conductive polymer and a dopant, then an electrostatic spinning method is adopted to prepare the super-hydrophilic conductive nanofiber membrane, after the membrane is pre-wetted with distilled water, oil-water emulsion is filtered under the condition of low dual-pressure driving, and compared with the condition of no electric field assistance, the super-hydrophilic conductive nanofiber membrane has the advantages that the super-hydrophilic conductive nanofiber membrane can be used for filtering oil-water emulsion; by applying the electric field, membrane pollution can be effectively relieved, flux loss in the separation process is reduced, the COD removal rate is 90% or above, the total average flux increasing proportion in the filtering period can reach 591%, and the flux is not remarkably attenuated along with time. The super-hydrophilic conductive nanofiber membrane provided by the invention can enhance the anti-pollution performance and improve the treatment flux under an electric field auxiliary condition, has good treatment flux, treatment effect and anti-pollution performance, and is convenient in material preparation, mild in operation condition and wide in applicable treatment object range.

Description

technical field [0001] The invention belongs to the field of oil-water separation, and in particular relates to a durable and anti-pollution super-hydrophilic conductive nanofiber membrane for emulsion separation and a preparation method thereof, as well as a method for treating oil-in-water emulsion with an auxiliary electric field. Background technique [0002] Emulsion has the characteristics of high oil content, high concentration of organic matter, and complex composition. Direct discharge will cause serious damage to the ecological environment. It belongs to hazardous waste (HW09) and is the key and difficult point in industrial wastewater treatment. Membrane separation technology has been gradually applied in emulsion treatment projects due to its characteristics of chemical dosage, low output of secondary hazardous waste and low energy consumption for treatment. However, the oil droplets in the emulsion are easy to infiltrate on the membrane surface and cause serious...

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Problems solved by technology

At the same time, since the conductive film is mainly made of conductive ceramics, CNT, conductive polymer and other materials, and is prepared by deposition method, the membrane pore size is small and the hydrophilicity is limited. Generally, the processing flux is not high, and the conductive layer is easy to fall off.

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