Composite separation membrane and preparation method thereof

A technology for separating membranes and composite particles, applied in the field of membrane separation, can solve the problems of hindering the photocatalytic function of composite membranes, reducing the antifouling effect, etc., and achieve the effects of excellent flux recovery effect, environmental friendliness and high reaction efficiency.

Active Publication Date: 2021-12-21
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only reduces the antifouling effect of adding ZnO, but also seriously hinders the photocatalytic function of the composite film.

Method used

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  • Composite separation membrane and preparation method thereof
  • Composite separation membrane and preparation method thereof
  • Composite separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 25g nickel sulfate hexahydrate, 50g sodium pyrophosphate decahydrate, 45 milliliters of ammonia (28%) and 1.5g dimethylaminoborane are poured into 1 liter of deionized water, then, 5 milliliters of silver nitrate (1.597 g / liter) into the dissolving solution, and after fully reacting at 25°C for 20 minutes, a solid precipitate-nickel was obtained, and the precipitated material was taken out, dried and fully ground.

[0034] The above-prepared nickel particles were immersed in a 2 g / L dopamine solution at a controlled temperature of 35° C., placed in a shaking incubator for 24 hours, and sucked out with a magnet to obtain dopamine-coated nickel particles. The role of dopamine is to adhere to zinc oxide (abbreviation: ZnO) particles next. The dopamine-coated nickel particles prepared above were immersed in 200 ml of deionized water containing 3 g of zinc oxide, and stirred at room temperature for 12 hours to obtain nickel particles adhered with zinc oxide. Put the prepar...

Embodiment 2

[0036] In order to investigate the morphology change of the particle surface before and after compounding, this embodiment carried out SEM test on the film, as shown in figure 2 Shown, a (I) and a (II) are the SEM images of the particles before compounding under different magnifications, b (I) and b (II) are the SEM images of the Ni-ZnO composite particles under different magnifications, wherein, The magnifications of a(I) and b(I) are the same, and the magnifications of a(II) and b(II) are the same. It is found that the surface of Ni-ZnO composite particles has a huge difference in morphology compared with the original particles. Nickel and ZnO A network structure was formed, demonstrating the successful recombination of Ni with ZnO.

Embodiment 3

[0038] In order to investigate the morphology change of the film surface before and after compounding, this embodiment carried out SEM test on the film, as image 3 Figure a shows the SEM image of the PVDF membrane before compounding, and Figure b shows the SEM image of the PVDF-Ni-ZnO composite separation membrane. It was found that a protruding particle structure appeared on the surface of the PVDF-Ni-ZnO composite separation membrane, which proved that Ni was successfully compounded on the surface of the PVDF membrane.

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Abstract

The present invention relates to the technical field of membrane separation, in particular to providing a method for preparing a composite separation membrane, comprising the following steps: putting ferromagnetic metal-zinc oxide composite particles into a polymer casting solution to obtain a blended membrane solution; The blended film solution is scraped. During the scraping process, an external magnetic field is added to attract the ferromagnetic metal-zinc oxide composite particles to the surface of the blended film solution; then phase inversion is performed. The present invention reduces the ferromagnetic metal-zinc oxide composite particles in situ on the surface of the blended membrane solution by adding an external magnetic field, greatly improving the flux recovery rate of the composite separation membrane, and the reaction process has mild conditions, no energy consumption, no reaction High efficiency and obvious promotion advantages.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a composite separation membrane and a preparation method thereof. Background technique [0002] Available freshwater resources are shrinking. Additionally, water pollution makes limited water systems worse. Pollutants in water are extremely harmful to the human body and can cause many diseases. As a new interdisciplinary practical technology, membrane technology has gradually emerged in the utilization of sewage resources in recent years. The use of membrane separation technology can remove suspended solids, bacteria, toxic metal substances and organic substances in water, greatly improving water quality. Compared with traditional separation technology, membrane technology has more advantages such as high efficiency, energy saving, environmental friendliness, easy process control, convenient operation, and easy integration with other technologies. Therefore, membr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02
CPCB01D67/0079B01D69/12B01D69/02B01D2325/10B01D2325/36
Inventor 刘莹林红军申利国曾千千
Owner ZHEJIANG NORMAL UNIVERSITY
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