Nanofiber membrane for water-oil emulsion separation and preparing method thereof

A nanofiber membrane and oil-water emulsion technology, which is applied in the field of preparation of nanofiber membrane materials, can solve the problems of less involvement in membrane filtration, and achieve the effects of easy industrial production, mild reaction conditions and simple production process.

Inactive Publication Date: 2018-01-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, potassium methyl silicate is mainly used for surface waterproofing of stone, brick, ceramics, concrete, cement mortar,

Method used

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  • Nanofiber membrane for water-oil emulsion separation and preparing method thereof
  • Nanofiber membrane for water-oil emulsion separation and preparing method thereof
  • Nanofiber membrane for water-oil emulsion separation and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of polymethylsilicol-coated nanofiber membranes by soaking polyacrylonitrile fiber membranes in 20% potassium methylsilicate solution

[0029] (1) dissolving polyacrylonitrile in N,N-dimethylformamide solution is configured into spinning solution, the mass fraction of spinning material accounting for the total system is 12.5%, and under magnetic stirring until the solution is clear and uniform, then Let stand for 24 hours.

[0030] (2) Electrospinning is carried out in a self-assembled electrospinning device, electrospinning parameters: the diameter of the spinneret is 0.8mm, at a voltage of 15kV, the receiving distance is 15cm, and the electrospinning is carried out at a propulsion speed of 0.8mL / h, tin foil Paper is used for receiving, and the volume of each fiber membrane spinning solution is 0.5 mL. The collected electrospun nanofibrous membranes were dried for later use. The prepared electrospun nanofiber membrane exhibits a monodisperse state between...

Embodiment 2

[0034] Preparation of polymethylsilicic alcohol-coated nanofiber membranes by soaking polylactic acid nanofiber membranes in 10% potassium methylsilicate solution

[0035] (1) Polylactic acid is dissolved in N, N-dimethylformamide solution and is configured into a spinning solution, the mass fraction of the spinning material in the total system is 12.5%, and the solution is clear and uniform under magnetic stirring, and then statically Set for 24 hours.

[0036] (2) Electrospinning is carried out in a self-assembled electrospinning device, electrospinning parameters: the diameter of the spinneret is 0.5mm, at a voltage of 16kV, the receiving distance is 12cm, electrospinning is performed at a propulsion speed of 0.8mL / h, tin foil Paper is used for receiving, and the volume of each fiber membrane spinning solution is 0.5 mL. The collected electrospun nanofibrous membranes were dried for later use. The prepared electrospun nanofibrous membrane exhibits a monodisperse state bet...

Embodiment 3

[0040] Preparation of Polymethicon-coated Nanofiber Membrane by Soaking Chitosan Nanofiber Membrane in 30% Potassium Methylsilicate Solution

[0041] (1) dissolving chitosan in N,N-dimethylformamide solution is configured into a spinning solution, the mass fraction of the spinning material accounting for the total system is 12.5%, and under magnetic stirring until the solution is clarified and uniform, then Let stand for 24h.

[0042] (2) Electrospinning was carried out in a self-made electrospinning device, electrospinning parameters: the diameter of the spinneret needle was 0.5 mm, the receiving distance was 15 cm at a voltage of 12 kV, and the electrospinning was carried out at a propulsion speed of 1.0 mL / h. The fibers were spun onto tin foil paper, and the volume of each fiber membrane spinning solution was 0.5 mL. The collected electrospun nanofibrous membranes were dried for later use. The prepared electrospun nanofibrous membrane exhibits a monodisperse state between...

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Abstract

The invention discloses a nanofiber membrane coated with polymethylsilicate for water-oil emulsion separation and a preparing method thereof. The method includes the following steps of preparing a polymer solution, preparing a nanofiber membrane through static spinning, soaking the prepared nanofiber membrane in a potassium methyl silicate solution, adjusting the pH of the solution to be about 7 with acid under the ultrasonic condition, and conducting drying to prepare the nanofiber membrane coated with polymethylsilicate. The surface of the nanofiber membrane is coated with a layer of polymethylsilicate, so emulsified water-oil drops can be broken during water-oil filtering, and the water-oil separation efficiency and the repeated utilization rate are increased; on the other hand, the surfaces of nanofiber are coated with polymethylsilicate, so the use intensity of the filtering membrane is improved; the preparing method has the advantages of being easy to operate, low in cost, easy to control in the process and the like.

Description

technical field [0001] The invention belongs to the field of oil-water emulsion separation membrane materials, and in particular relates to the preparation of a polymethylsilicol-coated nanofiber membrane material used for oil-water emulsion separation. Background technique [0002] Due to the increasing industrial oily wastewater, polluted seawater and frequent oil spills, such as deepwater oil spills in the Gulf of Mexico, oil-water separation has become a worldwide problem. Traditional methods such as oil skimmers, centrifuges, depth filtration, sedimentation, and flotation separation can be used for insoluble oil-water mixtures, but are ineffective for emulsified oil-water mixtures, especially microemulsions (droplet size <20 μm) in the presence of surfactants. Electrospinning nanofibers are at the forefront of advanced spinning materials, combining good wettability, connectivity, strong mechanical properties, good adaptability, large specific surface area and easy pr...

Claims

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Application Information

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IPC IPC(8): D04H1/728D01D5/00D06M15/643B01D17/022
Inventor 冯章启李家城李爽
Owner NANJING UNIV OF SCI & TECH
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