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Nanofiber composite membrane for liquid-liquid membrane extraction process and preparation method thereof

A technology of nanofibers and composite membranes, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as progress obstacles, lack of long-term stability of extraction membranes, etc., and achieve excellent corrosion resistance, excellent long-term stability, excellent selective effect

Pending Publication Date: 2020-11-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Despite the many advantages of liquid-liquid membrane extraction, its progress in practical applications is still limited due to the lack of extraction membranes with high organic mass transfer efficiency, excellent selectivity, excellent long-term stability, and excellent corrosion resistance. serious hindrance

Method used

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  • Nanofiber composite membrane for liquid-liquid membrane extraction process and preparation method thereof
  • Nanofiber composite membrane for liquid-liquid membrane extraction process and preparation method thereof
  • Nanofiber composite membrane for liquid-liquid membrane extraction process and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] In order to precisely control and minimize the thickness of the PDMS selective layer, an electrostatic spray printing technology was proposed to achieve precise control of the thickness of the PDMS selective layer. By controlling the electrostatic spray printing time of 30wt% PDMS solution, PDMS selective layers with three different thicknesses were prepared on the PVDF / nonwoven support layer. The thicknesses of the PDMS selective layers of the three composite membranes are 3.0±0.4μm, 6.2±0.4μm and 9.6±0.4μm respectively, and the corresponding electrostatic spraying times are 40min, 80min and 120min, respectively named #N3-1 and #N3-2 and #N3-3, the plane and cross-sectional SEM images of the three composite membranes are shown in image 3 . The thickness of the PDMS selective layer can be as low as 3.0 μm. This result shows that the precise control of the thickness of the PDMS selective layer can be achieved by electrostatic spray printing technology.

Embodiment 2

[0033]By applying to the three composite membranes (#N3-1, #N3-2 and #N3-3) obtained in Example 1 Figure 4 The liquid-liquid extraction device shown was used to test the phenol mass transfer effect of three composite membranes. The experimental results are as follows: Figure 5 As shown, the phenol mass transfer efficiency of the three composite membranes gradually decreases with the increase of the selective thickness, and the phenol mass transfer coefficient (k 0 ) can reach 37.9±2.8×10 -7 m / s, excellent rejection rate above 99.95%. The results of this example show that the electrospinning and electrostatic spray printing technologies are effective ways to prepare nanofiber composites with high organic mass transfer efficiency and excellent selectivity for the liquid-liquid membrane extraction process.

Embodiment 3

[0035] By the nanofiber composite #N3-1 with high organic mass transfer efficiency and excellent selectivity obtained in Example 1 according to Figure 4 The shown liquid-liquid extraction device has carried out 105 hours of continuous phenol mass transfer tests, the results are as follows Figure 6 As shown in A, the composite membrane maintained a very high phenol k throughout the test process. 0 Value (37.9±2.8×10 -7 ), the retention rate also remains above 99.95%. This example shows that the composite membrane prepared by the invention has excellent long-term stability.

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Abstract

The invention discloses a nanofiber composite membrane for a liquid-liquid membrane extraction process and a preparation method thereof, wherein the nanofiber composite membrane is of a multilayer membrane structure composed of a PVDF / non-woven fabric nanofiber support layer and a PDMS selection layer, the PVDF / non-woven fabric nanofiber support layer forms PVDF nanofibers on a non-woven fabric through electrostatic spinning, and then hot pressing treatment is carried out to form the high-porosity PVDF / non-woven fabric nanofiber supporting layer. Then a PDMS selection layer is prepared on thePVDF / non-woven fabric nanofiber supporting layer through an electrostatic spray printing technology. The PDMS / PVDF / non-woven fabric nanofiber composite membrane with the three-layer structure appliedto the liquid-liquid membrane extraction process can effectively improve the organic matter mass transfer effect of the composite membrane; meanwhile, the composite membrane has excellent selectivity,excellent long-term stability and excellent corrosion resistance.

Description

technical field [0001] The invention belongs to the field of high-salinity organic wastewater treatment, and specifically relates to a nanofiber composite membrane with high mass transfer coefficient, high rejection rate and corrosion resistance for liquid-liquid membrane extraction process and a preparation method thereof. Background technique [0002] Industrial wastewater produced by chemical, pharmaceutical, petrochemical, smelting, papermaking, coking, food manufacturing and other enterprises usually has the characteristics of high salinity, extreme pH, and a large amount of refractory toxic organic substances. Therefore, this type of wastewater needs to be treated before being discharged into natural water bodies or urban sewage pipe networks. Refractory organic substances such as phenols, phenolic compounds, pesticides, and antibiotics often contained in high-salinity organic wastewater can cause harm to the ecosystem even at low concentrations. Traditional physical ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/10B01D69/02B01D67/00B01D61/24B01D71/70C02F1/44D04H1/728D04H1/4374C02F101/30
CPCB01D69/125B01D69/105B01D71/70B01D69/02B01D61/246B01D67/0002C02F1/44D04H1/728D04H1/4374C02F2101/30B01D2323/39
Inventor 廖园黄津辉田玉晓
Owner NANKAI UNIV
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