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Graphene oxide modified separation membrane based on electrostatic spraying as well as preparation and application of graphene oxide modified separation membrane

An electrostatic spray, graphene technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as membrane wetting, pollution, membrane permeation flux decline, etc., to achieve large-scale industrial Simple and convenient production and operation, excellent anti-pollution effect

Active Publication Date: 2022-05-10
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing membrane distillation industry, commercial membranes often have membrane fouling and membrane wetting problems: (1) Membrane fouling refers to the phenomenon that pollutants deposit on the membrane surface or enter the membrane pores, resulting in a decrease in the permeation flux of the membrane, making the membrane The distillation process cannot run stably for a long time; (2) membrane wetting occurs when liquid water exceeds the inlet pressure of the membrane pores and permeates to the distillate side
For example, the prior art adopts the method of completely wetting, soaking and absorbing, soaking the polyethersulfone ultrafiltration membrane in dopamine and polyethyleneimine blend solution, graphene oxide solution, and dopamine solution in sequence, washing and air-drying, and then immersing in water for storage. A composite nanofiltration membrane based on graphene oxide is obtained. If the method is directly transferred to the preparation of the hydrophilic-hydrophobic "Janus" composite membrane, the "Janus" composite membrane will lose its superhydrophobicity due to being completely wetted. The "Janus" composite film is prepared by electrostatic spraying technology that is only sprayed on the surface, but if dopamine is sprayed on the base film of the "Janus" composite film, a violent reaction will occur and coagulation will occur, resulting in the spraying of the "Janus" composite film uneven

Method used

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  • Graphene oxide modified separation membrane based on electrostatic spraying as well as preparation and application of graphene oxide modified separation membrane
  • Graphene oxide modified separation membrane based on electrostatic spraying as well as preparation and application of graphene oxide modified separation membrane
  • Graphene oxide modified separation membrane based on electrostatic spraying as well as preparation and application of graphene oxide modified separation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Example 1 Preparation of a modified graphene oxide separation membrane based on electrostatic spraying

[0063] S1. Mix graphene oxide aqueous solution (sheet diameter 50-200nm), catechol, and ethanol aqueous solution, so that the final concentration of graphene oxide is 0.2g / L, the final concentration of catechol is 2g / L, ethanol The final concentration of 57.14% (v / v), ultrasonic dispersion under 600W for 30min, to obtain graphene oxide-catechol dispersion;

[0064] S2. Cut out a polyvinylidene fluoride film (0.22 μm) with a size of 12cm×15cm and fix it on the collecting plate of the electrospinning machine, and then spray the graphene oxide-catechol dispersion obtained in S1 onto the electrospinning machine by electrostatic spraying method. On any surface of the polyvinylidene fluoride film, control the amount of graphene oxide-catechol dispersion so that the ratio of the mass of graphene oxide to the area of ​​one side of the polyvinylidene fluoride film is 1.07g: 1...

Embodiment 2

[0067] Example 2 Preparation of a modified graphene oxide separation membrane based on electrostatic spraying

[0068] S1. Mix graphene oxide aqueous solution (sheet diameter 50-200nm), catechol, and ethanol aqueous solution, so that the final concentration of graphene oxide is 0.5g / L, the final concentration of catechol is 4g / L, ethanol The final concentration is 25% (v / v), ultrasonic dispersion under 400W for 40min, to obtain graphene oxide-catechol dispersion;

[0069] S2. Cut out a polyvinylidene fluoride film (0.22 μm) with a size of 12cm×15cm and fix it on the collecting plate of the electrospinning machine, and then spray the graphene oxide-catechol dispersion obtained in S1 onto the electrospinning machine by electrostatic spraying method. On any surface of the polyvinylidene fluoride film, control the amount of graphene oxide-catechol dispersion so that the ratio of the quality of graphene oxide to the area of ​​one side of the polyvinylidene fluoride film is 1.5g: 1m...

Embodiment 3

[0072] Example 3 Preparation of a modified graphene oxide separation membrane based on electrostatic spraying

[0073] S1. Mix graphene oxide aqueous solution (sheet diameter 50-200nm), catechol, and ethanol aqueous solution, so that the final concentration of graphene oxide is 0.15g / L, the final concentration of catechol is 1g / L, ethanol The final concentration is 60% (v / v), ultrasonic dispersion at 800W for 20min, to obtain graphene oxide-catechol dispersion;

[0074] S2. Cut out a polyvinylidene fluoride film (0.22 μm) with a size of 12cm×15cm and fix it on the collecting plate of the electrospinning machine, and then spray the graphene oxide-catechol dispersion obtained in S1 onto the electrospinning machine by electrostatic spraying method. On any surface of the polyvinylidene fluoride film, control the amount of graphene oxide-catechol dispersion so that the ratio of the quality of graphene oxide to the area of ​​one side of the polyvinylidene fluoride film is 1g:1m 2 ;...

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Abstract

The invention provides a graphene oxide modified separation membrane based on electrostatic spraying as well as preparation and application of the graphene oxide modified separation membrane. The preparation method comprises the following steps: firstly, mixing graphene oxide, plant polyphenol and a dispersing agent, carrying out ultrasonic dispersion, then spraying an obtained graphene oxide-plant polyphenol dispersion liquid to any surface of a hydrophobic base membrane by adopting an electrostatic spraying method, and then carrying out crosslinking treatment on the hydrophobic base membrane by adopting polyethyleneimine, so as to obtain the graphene oxide modified separation membrane. Wherein the spraying treatment and the crosslinking treatment are carried out on the same surface of the hydrophobic base membrane. The graphene oxide modified separation membrane provided by the invention has a hydrophilic surface layer and a hydrophobic mass transfer layer at the same time, can maintain long-term and stable operation, has better pollution resistance, wetting resistance, desalination effect and permeation flux, and is a hydrophilic-hydrophobic Janus composite membrane with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation. More specifically, it relates to a graphene oxide modified separation membrane based on electrostatic spraying and its preparation and application. Background technique [0002] Membrane distillation is an emerging membrane-based thermal distillation technology. It is a thermal desalination process based on a hydrophobic membrane and driven by a vapor pressure difference. During the membrane distillation process, the temperature difference between the feed liquid and the distillate liquid on both sides of the porous hydrophobic membrane generates a partial vapor pressure difference, which drives the water vapor through the hydrophobic membrane from the feed side to the distillate side, and condenses into pure distillate on the distillate side. water. Membrane distillation has many advantages over other desalination techniques: first, vapor pressure reduces its sensitivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D61/36B01D67/00B01D69/02C02F1/44C02F103/08
CPCB01D71/26B01D69/02B01D67/0079B01D61/364C02F1/447C02F2103/08Y02A20/131
Inventor 赵姗姗余征世孟凡刚韩木侨
Owner SUN YAT SEN UNIV