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Self-cleaning graphene oxide nanofiltration membrane and preparation method thereof

A graphene and self-cleaning technology, which is applied in the field of nanofiltration membranes, can solve the problems of unmaintainable dye removal rate, low dye retention effect, graphene oxide membrane hindering application, etc., achieve good self-cleaning effect, improve application prospects, Qualcomm The effect of water volume

Inactive Publication Date: 2020-10-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fouling problem of graphene oxide membrane (GO membrane) hinders its application in practical water treatment, making it unable to maintain long-term effective dye removal rate.
At the same time, when the dye molecules are smaller than the interlayer distance of the graphene oxide membrane and are positively charged, the graphene oxide nanofiltration membrane will show a lower dye retention effect

Method used

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  • Self-cleaning graphene oxide nanofiltration membrane and preparation method thereof
  • Self-cleaning graphene oxide nanofiltration membrane and preparation method thereof
  • Self-cleaning graphene oxide nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for self-cleaning graphene oxide nanofiltration membrane, comprising the following steps:

[0032] (1) Polypyrrole (PPy, Polypyrrole) wrapped titanium dioxide nanoparticles (PPy@TiO 2 ) preparation

[0033] Take a certain amount of pyrrole and titanium dioxide nanoparticles in 100mL pure water, ultrasonically disperse for 30min, add 1mL concentrated hydrochloric acid to adjust the solution to acidity, and irradiate with ultraviolet light under the condition of vigorous stirring, so that oxidative hydroxyl groups are produced in the aqueous solution Free radicals, triggering free radical polymerization of pyrrole monomers. At this time, with TiO 2 The particle is the core, and polypyrrole gradually wraps TiO as the reaction time prolongs 2 particles, forming PPy@TiO 2 hybrid structure. At this point, an equal volume of 100 mL of ethanol was added to terminate the reaction, and the subsequent operation was awaited.

[0034] (2) GO-PPy@TiO 2 Pre...

Embodiment 2

[0037] A preparation method for self-cleaning graphene oxide nanofiltration membrane, comprising the following steps:

[0038] Use TiO with a particle size of 5-10nm 2 Nanoparticles, which were configured into a dispersion solution with a concentration of 1 mg / mL, were ultrasonically treated for 1 h before use to fully disperse them. At the same time, a pyrrole solution with a concentration of 20 mg / mL was also prepared. Subsequently, take 10mLTiO 2 The dispersion was blended with 5 mL of pyrrole solution, and diluted to 100 mL with pure water. Under the condition of vigorous stirring, 1 mL of concentrated hydrochloric acid was added to adjust the pH to strong acidity, and pyrrole polymerization was initiated under the condition of ultraviolet light irradiation, and the reaction was performed for 3 h. At this time, pyrrole and TiO 2 The ratio is 10:1. After the reaction, take 5 mL of PPy@TiO with a concentration of 1.1 mg / mL 2 The dispersion was mixed with 1.6 mL of GO d...

experiment example 1

[0040] Adopt TEM (transmission electron microscope) to observe the morphology and the size of foreign particles and hybrid structure in embodiment 1, the result is as follows figure 1 shown. in figure 1 a is TiO 2 dispersed system, from figure 1 a It can be seen that the nanoparticles are aggregated in the dispersion liquid, which is due to the high surface energy of the nanoparticles and spontaneous aggregation for the overall stability. However, the interaction between particles is weak, and the overall shape can be changed according to the force to adapt to the external environment. figure 1 A large number of PPy@TiO with uniform particle size distribution in b 2 Spherical particles, whose size is much smaller than that of TiO 2 , which is due to the TiO 2 The outside is wrapped with a PPy polymer shell (as shown in c, a single PPy@TiO 2 TEM image of the particle), while reducing the surface energy of the particle, because PPy has a positive charge, its electrostatic...

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Abstract

The invention discloses a self-cleaning graphene oxide nanofiltration membrane and a preparation method thereof. The self-cleaning graphene oxide nanofiltration membrane comprises a supporting layer and a functional layer, and the functional layer is a GO-PPy-TiO2 hybrid membrane; the preparation method comprises the following steps: coating titanium dioxide nanoparticles with polypyrrole to forma PPy-coated TiO2 hybrid structure; respectively preparing a PPy-coated TiO2 nanoparticle dispersion liquid and a GO dispersion liquid, uniformly mixing the PPy-coated TiO2 nanoparticle dispersion liquid and the GO dispersion liquid, and then carrying out suction filtration on the mixture to the supporting layer by adopting a vacuum suction filtration method so as to obtain the self-cleaning graphene oxide nanofiltration membrane. The self-cleaning graphene oxide nanofiltration membrane has a self-cleaning effect, large water flux and high cationic dye interception efficiency, and the application prospect of the self-cleaning graphene oxide nanofiltration membrane in water treatment is improved.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a self-cleaning graphene oxide nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane technology is an efficient and energy-saving emerging separation membrane technology, among which graphene oxide (GO) has become an ideal nanofiltration membrane material due to its excellent mechanical stability and controllable interlayer spacing. However, the fouling problem of graphene oxide membrane (GO membrane) hinders its application in practical water treatment, making it unable to maintain long-term effective dye removal rate. At the same time, when the dye molecules are smaller than the interlayer spacing of the graphene oxide membrane and are positively charged, the graphene oxide nanofiltration membrane will show a lower dye retention effect. Therefore, it is of practical significance to develop a graphene ox...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D71/34B01D71/62B01D67/00B01D69/02B01D69/10
CPCB01D67/0079B01D69/02B01D69/10B01D71/021B01D71/024B01D71/34B01D71/62B01D2325/10
Inventor 何毅余昊肖国清梅雪李虹杰马静侯瑞彤高艺轩余晶
Owner SOUTHWEST PETROLEUM UNIV
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