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Preparation method for multifunctional self-cleaning nano fiber membrane used for oil-water separation

A nanofiber membrane, oil-water separation membrane technology, applied in fiber type, fiber treatment, semi-permeable membrane separation, etc., can solve the problems of poor mechanical properties of fiber membranes, limit practical applications, lose superhydrophobic properties, etc., and achieve high mechanical strength , Improve the effect of oil-water separation performance

Pending Publication Date: 2020-09-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the overlapping and separation of individual fibers, the mechanical properties of the prepared fiber membrane are poor, which limits its practical application in oil-water separation.
In addition, when treating sewage, it is inevitable to encounter some harsh environments, such as strong acid, strong alkali, high temperature and other environments, but the existing fiber separation membranes are difficult to use normally in these harsh and extreme conditions, such as losing their superhydrophobic properties. performance, long-term durability is a big challenge

Method used

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  • Preparation method for multifunctional self-cleaning nano fiber membrane used for oil-water separation
  • Preparation method for multifunctional self-cleaning nano fiber membrane used for oil-water separation
  • Preparation method for multifunctional self-cleaning nano fiber membrane used for oil-water separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add BPDA and PDA to a 100mL three-necked round bottom flask equipped with a mechanical stirrer, a thermometer, and an N2 inlet and outlet tube, and mix well. The mixture was stirred at minus 5 degrees Celsius for 24 h. At the end of the reaction, a viscous yellow PAA solution was obtained. The resulting product was redissolved in DMAc at room temperature to prepare an electrospinning solution. The applied voltage and flow rate are 25kv and 0.6Ml / h to provide a good electrospinning environment. The nanofibers were directly electrospun onto a horizontally rotating flywheel with a collection distance of 15 cm between the needle tip and the receiver. To obtain the final nanofibrous membrane, the PAA membrane was calcined in a high-temperature tube furnace.

Embodiment 2

[0033] Using a field emission scanning electron microscope (S-4800, Japan Hitachi Electronics Co.), observe the surface morphology of the PI film, GSH / PI film, ZIF-8 / PI film and ZIF-8@GSH / PI film prepared in Example 2 , confirming that the membrane material prepared by the present invention has a nano-rough structure. This time, the optical image profilometry method can be used to visually see the surface structure of the composite film.

[0034] Using a contact angle measuring instrument (JC2000D1), Shanghai Zhongchen Company, China, the wettability of the surface of the nanocomposite fiber membrane soaked in different concentrations of GSH solution and ZIF-8 was tested. Lay the membrane on the test platform, aim the camera at the platform to ensure that the complete picture can be captured, fill the injection needle with deionized water, push out 2 microliters of deionized water each time, so that the droplets stay on the surface of the membrane, Using the principle of "thr...

Embodiment 3

[0038] The field emission scanning electron microscope used this time has the function of analyzing elements, and the elements on the surface of the membrane are confirmed through the equipped EDS analysis, which confirms the successful modification of the membrane, such as image 3 shown. The appearance of D and G bands in the GSH / PI and ZIF-8@GSH / PI curves confirmed the existence of a well-coated GSH layer. Furthermore, the ID / IG value increased from 0.61 to 1.11 after sulfation, which was due to the decrease in the average size of the sp2 domains after sulfation of graphene oxide. Graphene oxide is composed of highly oxidized few-layer graphene sheets with multiple surface functional groups such as hydroxyl, epoxy, and carbonyl groups. During the sulfation process, graphene oxide was reduced and brominated by hydrobromic acid, and then further hydrolyzed by thiourea and sodium hydroxide to obtain sulfated graphene. The oxygen content of GSH (11.06%) is lower than that of ...

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Abstract

The invention discloses a super-hydrophobic water-based super-oleophilic nanno fiber membrane used for oil-water mixture separation and a preparation method thereof. The preparation method comprises the following steps: performing imidization on a simple, green and environment-friendly electrostatic spun polyacrylic acid nano fiber membrane to obtain a composite polyimide nano (PI) fiber membrane;and modifying the material through a zeolite type imidazolium salt framework-8 (ZIF-8) and sulfated graphene (GSH), thereby obtaining the core material. The material is represented through various analysis and test means, so that the effect of a super-hydrophobic oil-water separation membrane capable of modifying the nano fiber membrane can be verified. According to the results, the prepared nanofiber membrane has excellent oil-water separation effect, has good self-cleaning ability, is good in tolerance, can be used in a circulating mode, and is expected to solve the most severe ocean oil spill water pollution problem worldwide.

Description

technical field [0001] The invention relates to an in-situ hydrothermal modification technology, which is used to prepare a superhydrophobic and superoleophilic oil-water mixture separation membrane based on an electrospinning membrane, specifically a kind that can work normally under extreme conditions such as strong acid, strong alkali and high temperature. Nanofibrous membrane for oil-water mixture separation and preparation method thereof. Background technique [0002] As the world population grows, the total amount of water used worldwide increases year by year. However, in the past few decades, due to frequent oil spill accidents and the discharge of industrial oily wastewater, the problem of water pollution has become increasingly serious, posing a serious threat to the ecological environment and human health. The increasing proportion of petroleum wastewater has become a problem facing the world. It not only leads to energy loss and waste of resources, but also pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4326D04H1/4382D04H1/728D06B13/00B01D71/64B01D71/02B01D69/02B01D67/00C02F1/44D06M11/74D06M15/37D06M101/30
CPCB01D67/0079B01D69/02B01D71/021B01D71/64B01D2325/38C02F1/44D04H1/4326D04H1/4382D04H1/728D06B13/00D06M11/74D06M15/37D06M2101/30
Inventor 黄超伯周阿影曲清莉
Owner NANJING FORESTRY UNIV
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