A method for efficiently treating oil-in-water emulsions with a superhydrophilic nanofiber membrane with a gradient structure

A technology of nanofiber membrane and gradient structure, applied in fiber treatment, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., can solve the problems of less involvement, and achieve easy operation, strong anti-pollution performance and compatibility strong effect

Active Publication Date: 2022-01-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is still difficult and challenging to use superhydrophilic nanofibrous membranes to achieve efficient and rapid oil-water separation for nano-emulsions containing surfactants, and it is rarely involved in the field of oil-water separation of actual waste emulsions, so research and application are urgently needed

Method used

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  • A method for efficiently treating oil-in-water emulsions with a superhydrophilic nanofiber membrane with a gradient structure
  • A method for efficiently treating oil-in-water emulsions with a superhydrophilic nanofiber membrane with a gradient structure
  • A method for efficiently treating oil-in-water emulsions with a superhydrophilic nanofiber membrane with a gradient structure

Examples

Experimental program
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Effect test

Embodiment 1

[0049] see attached figure 1 , preparation of superhydrophilic nanofibrous membranes with gradient structure. A 500-mesh stainless steel mesh was selected, cut to a size of 300 mm in length and 210 mm in width, placed in acetone, ethanol, and distilled water in sequence for 5 min each, and dried for later use. Weigh 1.6 g of PAN and dissolve it in 20 mL of N,N-dimethylformamide, and at room temperature with 500 rpm magnetic stirring for 12 h to prepare a first concentration electrospinning working solution with a PAN concentration of 8%, weigh 0.7 g of PAN and dissolve it in 20 mL of N,N-dimethylformamide was magnetically stirred at 500 rpm for 12 h at room temperature to prepare a second concentration electrospinning working solution with a PAN concentration of 3.5%. Use tape to fix the stainless steel mesh on the receiving roller of the electrospinning machine, and spin the working solution with PAN concentration of 8% on the stainless steel mesh. The path length was 200 m...

Embodiment 2

[0053] The superhydrophilic nanofiber membrane with gradient structure prepared in Example 1 was used to treat the surfactant-stabilized nanoscale oil-in-water emulsion NE1, and the driving force was 3.0 kPa, and multiple cycles were continuously used for oil-water separation. The oil-water separation effect, anti-pollution and reusability were investigated using the rate, treatment flux and flux recovery rate. The results are attached Figure 4 As shown, the nano-scale oil-in-water emulsion NE1 was treated by this method, the treatment flux was 1143.33LMH, and the flux recovery rate was as high as 99.98%; Percentage of treated flux and first flux (Ji / J 0 ) are higher than 90.9%, and the flux recovery rate is still greater than 86% after 6 reuses, which proves that the superhydrophilic nanofiber membrane with gradient structure prepared by the present invention has high processing flux and ideal oil-water separation effect , The anti-pollution performance is extremely strong...

Embodiment 3

[0055] The nanoscale oil-in-water emulsions NE1 and NE2 stabilized by anionic or cationic surfactants were treated with the superhydrophilic nanofiber membrane with gradient structure prepared in Example 1, and the driving force was 3.0 kPa. The light transmittance and treatment flux were used to investigate the oil-water separation effect. The results are attached Figure 5As shown, the use of this method to treat the nanoscale oil-in-water emulsion stabilized by anionic / cationic surfactants can achieve a very ideal oil-water separation effect, and the oil retention of the nanoscale emulsion NE1 stabilized by anionic surfactant (SLS) can be treated The oil retention rate and light transmittance are 95.68% and 94.3%, respectively, and the treatment flux is 1143.33 LMH / bar, while the treatment of cationic surfactant (CTAB)-stabilized nano-emulsion NE2 is inferior, and the oil rejection and light transmittance are 92.51% and 92.4%, the processing flux is 935.45LMH / bar. It can ...

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Abstract

The invention provides a method for efficiently treating an oil-in-water emulsion with a superhydrophilic nanofiber membrane with a gradient structure. The specific preparation steps are electrospinning to prepare a superhydrophilic nanofiber membrane with a gradient structure. Pre-wet with filtered distilled water, and then directly filter the oil-in-water emulsion for oil-water separation. The filter membrane is only washed with clean water and then reused directly. The present invention can realize high-efficiency oil-water separation for the surfactant-stabilized oil-in-water emulsion whose droplet size ranges from micron to nanometer, and the low-pressure drive can achieve extremely high processing flux, and the oil retention rate is 92.51% to 99.52% %, the effect is not significantly attenuated after being reused for 6 times; the present invention uses the super-hydrophilic nanofiber membrane material with a gradient structure to realize efficient oil-water separation for various nano-scale oil-in-water emulsions, the material is convenient to prepare, the operating conditions are mild, and the oil The interception rate and treatment flux are high, the anti-pollution performance is strong, and the range of applicable treatment objects is wide.

Description

technical field [0001] The invention belongs to the technical field of oil-containing wastewater treatment, and in particular relates to a method for efficiently treating oil-in-water emulsion by a super-hydrophilic nanofiber membrane with a gradient structure. Background technique [0002] The amount of high-quality metalworking fluids is increasing with the rapid development of my country's precision machining industry. These metalworking fluids become waste emulsions after being recycled and used until they fail. Waste emulsions have extremely high environmental pollution and ecological risks and belong to hazardous waste. material (code HW09). The mechanical processing waste emulsion belongs to the oil-in-water emulsion, which contains a large amount of mineral oil and surfactant. The stability is extremely strong, which greatly increases the difficulty of demulsification and oil-water separation. [0003] In recent years, membrane separation technology has been regarde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44B01D71/42B01D69/12D01D5/00D04H1/728D04H1/43
CPCC02F1/44B01D71/42B01D69/12D01D5/003D01D5/0084D04H1/728D04H1/43B01D2325/36
Inventor 彭开铭张佳路黄翔峰刘婉琪熊永娇李乐雪郑维伟贺梦凡刘佳陆丽君
Owner TONGJI UNIV
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