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Preparation method and application of super-hydrophobic membrane

A super-hydrophobic and hydrophobic technology, applied in the field of membrane separation technology and water treatment, can solve the problems of poor anti-pollution performance and poor anti-wetting, and achieve the effect of promoting large-scale industrial application, small heat loss and simple operation.

Active Publication Date: 2016-03-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyvinylidene fluoride, polypropylene, polyethylene and other polymers with good hydrophobicity are commonly used in current patents and literatures for electrospinning or phase inversion to prepare membrane distillation membranes, but these membranes have poor wetting resistance. The anti-pollution performance is not good, and there are still many defects in the application of membrane distillation technology

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  • Preparation method and application of super-hydrophobic membrane

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Embodiment 1

[0025] The present embodiment provides a kind of preparation method of superhydrophobic membrane, comprises the following steps:

[0026] (1) Prepare 12wt% PVDF electrospinning solution, the solvent is N,N-dimethylacetamide and acetone with a mass ratio of 4:1, add 0.5wt% metal-organic framework nanoparticles, and spin the spinning solution at 45 After stirring for 2 hours at ℃, let stand for defoaming for 2 hours;

[0027] (2) Electrospinning parameters are selected: the voltage is 12kv, the inner diameter of the needle is 0.6mm, the injection speed of the spinning solution is 0.05mm / min, the distance between the receiving drum and the spinneret is 22cm, and the rotating speed of the receiving drum is 50r / min. The silk ambient temperature is 30° C., the air relative humidity is 50%, and the electrospinning process is carried out for 20 hours. Place the obtained nanofiber membrane between two glass plates, and put it into a 170°C oven for 30min heat treatment;

[0028] (3) T...

Embodiment 2

[0032] The present embodiment provides a kind of preparation method of superhydrophobic membrane, comprises the following steps:

[0033] (1) Prepare 15wt% PVDF electrospinning solution, the solvent is N,N-dimethylacetamide and acetone (mass ratio is 4:1), add 0.5wt% metal-organic framework nanoparticles, and spin the spinning solution in After stirring for 2 hours at 45°C, let it stand for 2 hours for defoaming;

[0034] (2) Electrospinning parameters are selected: the voltage is 10kv, the inner diameter of the needle is 0.6mm, the injection speed of the spinning solution is 0.2mm / min, the distance between the receiving drum and the spinneret is 17cm, the rotating speed of the receiving drum is 5r / min, and spinning The silk ambient temperature is 30° C., the air relative humidity is 50%, and the electrospinning process is carried out for 5 hours. Place the obtained nanofiber membrane between two glass plates, and put it into a 170°C oven for 1h heat treatment;

[0035] (3) ...

Embodiment 3

[0039] The present embodiment provides a kind of preparation method of superhydrophobic membrane, comprises the following steps:

[0040] (1) Prepare 12wt% PVDF electrospinning solution, the solvent is N,N-dimethylacetamide and acetone (mass ratio is 4:1), add 4wt% zinc oxide nanoparticles, and spin the spinning solution at 45°C After stirring for 2 hours, let stand for defoaming for 2 hours;

[0041] (2) Electrospinning parameters are selected: the voltage is 12kv, the inner diameter of the needle is 0.6mm, the injection speed of the spinning solution is 0.2mm / min, the distance between the receiving drum and the spinneret is 22cm, and the rotating speed of the receiving drum is 100r / min. The silk ambient temperature is 30° C., the air relative humidity is 50%, and the electrospinning process is carried out for 5 hours. Place the obtained nanofiber membrane between two glass plates, and put it into a 170°C oven for 30min heat treatment;

[0042] (3) The molar ratio is titani...

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Abstract

The invention provides a preparation method of a super-hydrophobic membrane. The preparation method comprises steps as follows: hydrophobic organic polymer materials and nano granules are dissolved in an organic solvent, the mixture is stirred and left to stand, and an electrostatic spinning solution is prepared; high-pressure electrostatic spinning parameters are set, electrostatic spinning membrane preparation is performed, and a nanofiber membrane is obtained and subjected to thermal treatment; TiO2 is prepared, the surface of the nanofiber membrane is covered with TiO2, and thermal treatment, water-bath heating, washing and ultraviolet radiation treatment are performed; silane solutions are prepared, the nanofiber membrane surface covered with TiO2 is covered with the silane solutions, thermal treatment, washing and airing are performed, and the super-hydrophobic membrane is obtained. The invention further provides an application of the super-hydrophobic membrane in the membrane distillation process. By means of the method, the super-hydrophobic nanofiber membrane is prepared. The membrane simultaneously has super-hydrophobicity and high throughput performance, the wet resistance of the membrane is effectively improved, and the service life of the membrane is prolonged.

Description

technical field [0001] The invention relates to the fields of membrane separation technology and water treatment, in particular to a preparation method of a superhydrophobic membrane and its application in membrane distillation. Background technique [0002] The scarcity of water resources and the increasingly serious water pollution require that sewage treatment must be transformed into advanced treatment and reuse. Due to its high separation efficiency, low energy consumption, simple process, no need to add additional chemicals, reliable operation, compact equipment, small footprint, high product water quality, and easy integration with other technologies, membrane technology has gradually become a national standard in the world. The core technology concerned in the field of water treatment. Among them, reverse osmosis membrane separation technology is a new technology that has been rapidly developed and applied in my country in recent years, and has gradually become an i...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D61/36
CPCB01D61/364B01D67/0002B01D71/34
Inventor 邵嘉慧夏凡徐凤
Owner SHANGHAI JIAO TONG UNIV
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