Production method of super-hydrophobic, moisture-resistant and scaling-resistant hybrid nanofiber composite membrane for membrane distillation

A technology of nanofibers and production methods, applied in the field of preparation of superhydrophobic hybrid nanofiber composite membranes, which can solve problems such as easy scaling, difficult long-term operation, easy wetting of separation membranes, etc.

Pending Publication Date: 2020-10-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems such as easy wetting, easy fouling and long-term operation of the separation membrane, the purpose of the present invention is to provide a production method of a superhydrophobic hybrid nanocomposite membrane

Method used

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  • Production method of super-hydrophobic, moisture-resistant and scaling-resistant hybrid nanofiber composite membrane for membrane distillation
  • Production method of super-hydrophobic, moisture-resistant and scaling-resistant hybrid nanofiber composite membrane for membrane distillation
  • Production method of super-hydrophobic, moisture-resistant and scaling-resistant hybrid nanofiber composite membrane for membrane distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of polyvinylidene fluoride / zinc acetate nanofiber membrane: Add PVDF powder and zinc acetate to N,N-dimethylformamide and acetone solution, stir at 90°C to make PVDF powder and zinc acetate completely The solution is spun by electrospinning technology to obtain a polyvinylidene fluoride / zinc acetate nanofiber film, the zinc acetate accounts for 1.5% by mass of the PVDF powder, and the concentration of the PVDF solution is 17%, N, The mass ratio of N-dimethylformamide and acetone is 3:1.

[0027] (2) Preparation of polyvinylidene fluoride / zinc oxide nanofiber membrane: the polyvinylidene fluoride / zinc acetate nanofiber membrane was placed in an oven for heat treatment at a temperature of 130° C., and the heat treatment time was 12 hours.

[0028] (3) Preparation of zinc oxide@polyvinylidene fluoride nanofiber membrane: Soak the polyvinylidene fluoride / zinc oxide nanofiber membrane in absolute ethanol for 10 minutes, and then put it in a mixture of hexamet...

Embodiment 2

[0030] (1) Preparation of polyvinylidene fluoride / zinc acetate nanofiber membrane: Add PVDF powder and zinc acetate to N,N-dimethylformamide and acetone solution, stir at 90°C to make PVDF powder and zinc acetate completely The solution is spun by electrospinning technology to obtain a polyvinylidene fluoride / zinc acetate nanofiber film, the zinc acetate accounts for 1.5% by mass of the PVDF powder, and the concentration of the PVDF solution is 17%, N, The mass ratio of N-dimethylformamide and acetone is 3:1.

[0031] (2) Preparation of polyvinylidene fluoride / zinc oxide nanofiber membrane: the polyvinylidene fluoride / zinc acetate nanofiber membrane was placed in an oven for heat treatment at a temperature of 130° C., and the heat treatment time was 12 hours.

[0032] (3) Preparation of zinc oxide@polyvinylidene fluoride nanofiber membrane: Soak the polyvinylidene fluoride / zinc oxide nanofiber membrane in absolute ethanol for 10 minutes, and then put it in a mixture of hexamet...

Embodiment 3

[0035](1) Preparation of polyvinylidene fluoride / zinc acetate nanofiber membrane: Add PVDF powder and zinc acetate to N,N-dimethylformamide and acetone solution, stir at 90°C to make PVDF powder and zinc acetate completely The solution is spun by electrospinning technology to obtain a polyvinylidene fluoride / zinc acetate nanofiber film, the zinc acetate accounts for 1.5% by mass of the PVDF powder, and the concentration of the PVDF solution is 17%, N, The mass ratio of N-dimethylformamide and acetone is 3:1.

[0036] (2) Preparation of polyvinylidene fluoride / zinc oxide nanofiber membrane: the polyvinylidene fluoride / zinc acetate nanofiber membrane was placed in an oven for heat treatment at a temperature of 130° C., and the heat treatment time was 12 hours.

[0037] (3) Preparation of zinc oxide@polyvinylidene fluoride nanofilm: Soak polyvinylidene fluoride / zinc oxide nanofiber film in absolute ethanol for 10 minutes, and then put it in the water of hexamethylenetetramine, zi...

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Abstract

The invention discloses a production method of a super-hydrophobic, moisture-resistant and scaling-resistant hybrid nanofiber composite membrane for membrane distillation. The production method comprises the following process steps: (1) preparing polyvinylidene fluoride (PVDF), zinc acetate, N, N-dimethylformamide and acetone according to a certain proportion, and uniformly stirring, (2) preparinga polyvinylidene fluoride/zinc acetate nanofiber membrane by utilizing an electrostatic spinning technology, (3) putting the polyvinylidene fluoride/zinc acetate nanofiber membrane into an oven for heat treatment to obtain a polyvinylidene fluoride/zinc oxide nanofiber membrane, (4) soaking the polyvinylidene fluoride/zinc oxide nano-fiber membrane with absolute ethyl alcohol, and then putting the soaked polyvinylidene fluoride/zinc oxide nano-fiber membrane into hexamethylenetetramine, zinc nitrate and an ammonia water solution for hydrothermal treatment to obtain a zinc oxide@polyvinylidenefluoride nano-fiber membrane, and (5) modifying the zinc oxide@polyvinylidene fluoride nanofiber membrane with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, so as to obtain the hybrid nanofiber composite membrane. The hybrid nano composite membrane prepared by the method has super-hydrophobicity, wetting resistance, scaling resistance, higher salt rejection rate and stable permeation flux, and isbeneficial to long-term stable operation.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane in the technical field of membrane distillation, in particular to a preparation method of a superhydrophobic hybrid nanofiber composite membrane. Background technique [0002] At present, the shortage of fresh water has become one of the important problems of human survival and development. In addition, population growth, increased industrial and agricultural water consumption, water pollution and waste of water resources have exacerbated the problem of water crisis. Desalination of seawater is one of the solutions to alleviate water scarcity. There are many methods for seawater desalination, such as: reverse osmosis, thermal evaporation, nanofiltration and membrane distillation. Among them, membrane distillation technology is considered to be a promising seawater desalination technology due to its advantages of utilizing waste heat, low operating pressure and temperature, and bei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/12B01D71/34C02F1/08C02F103/08
CPCB01D61/364B01D67/0079B01D69/12B01D71/34B01D2325/38C02F1/08C02F2103/08
Inventor 刘雍潘天帝范杰厉宗洁王亮夏兆鹏邓南平
Owner TIANJIN POLYTECHNIC UNIV
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