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Mixed graphene oxide nanofiltration membrane and preparation method and application thereof

A graphene, nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technology and other directions, can solve the problems of low desalination efficiency, weak long-term stability, etc., to improve salt interception efficiency, strong mechanical stability, reduce The effect of layer spacing

Active Publication Date: 2020-02-11
成都石大力盾科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two specific challenges for practical application of graphene oxide nanofiltration membranes, namely weak long-term stability and low desalination efficiency.

Method used

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  • Mixed graphene oxide nanofiltration membrane and preparation method and application thereof
  • Mixed graphene oxide nanofiltration membrane and preparation method and application thereof
  • Mixed graphene oxide nanofiltration membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A small size graphene oxide nanofiltration membrane:

[0062] Include the following steps:

[0063] S1: Disperse and centrifuge graphene oxide first, then take the supernatant for drying and quantification to obtain small-sized graphene oxide. The specific preparation steps are:

[0064] S11: After dispersing the graphene oxide, centrifuge at 400rpm for 3 minutes, and then take the supernatant;

[0065] S12: continue to centrifuge the supernatant obtained in S11 at 12000 rpm for 3 minutes, and take the supernatant;

[0066] S13: continue to centrifuge the supernatant obtained in S12 at 12000 rpm for 3 minutes, take the supernatant, and then dry and quantify it to obtain small-sized graphene oxide;

[0067] S2: configuring the obtained small-sized graphene oxide into a small-sized graphene oxide dispersion with pure water;

[0068] S3: The concentration of the small-sized graphene oxide dispersion is 0.05 mg / mL, and stirring and ultrasonic dispersion are carried out f...

Embodiment 2

[0070] A large-scale graphene oxide nanofiltration membrane:

[0071] Include the following steps:

[0072] S1: Disperse and centrifuge the graphene oxide first, then take the precipitate at the bottom for drying and quantification to obtain large-size graphene oxide;

[0073] Concrete preparation steps are:

[0074] S11: After dispersing the graphene oxide, centrifuge at 400 rpm for 3 minutes, and collect the precipitate after standing still;

[0075] S12: After dispersing the precipitate obtained in S11, centrifuge at 400 rpm for 3 minutes, and take the precipitate after standing still;

[0076] S13: After dispersing the precipitate obtained in S12, centrifuge at 400 rpm for 3 minutes, take the precipitate after standing still, dry and quantify the precipitate to obtain large-sized graphene oxide;

[0077] S2: The large-size graphene oxide is prepared into a large-size graphene oxide dispersion with pure water;

[0078] S3: The concentration of the large-size graphene ox...

Embodiment 3

[0080] A hybrid graphene oxide nanofiltration membrane:

[0081] Include the following steps:

[0082] S1: Disperse and centrifuge the graphene oxide first, then take the supernatant to dry and quantify to obtain small-sized graphene oxide; take the bottom precipitate to dry and quantify to obtain large-sized graphene oxide;

[0083] Specific steps for preparing large-scale graphene oxide:

[0084] S11: After dispersing the graphene oxide, centrifuge at 400 rpm for 3 minutes, and collect the precipitate after standing still;

[0085] S12: After dispersing the precipitate obtained in S11, centrifuge at 400 rpm for 3 minutes, and take the precipitate after standing still;

[0086] S13: After dispersing the precipitate obtained in S12, centrifuge at 400 rpm for 3 minutes, take the precipitate after standing still, dry and quantify the precipitate to obtain large-sized graphene oxide.

[0087] Specific steps for preparing small-sized graphene oxide:

[0088] S14: Collect the s...

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Abstract

The invention provides a preparation method of a mixed graphene oxide nanofiltration membrane. The preparation method comprises the following steps: dispersing and centrifuging graphene oxide, takinga liquid supernatant, and drying and quantifying the liquid supernatant to obtain small-size graphene oxide; re-dispersing a precipitate at the bottom, carrying out centrifuging, and drying and quantifying the obtained precipitate to obtain large-size graphene oxide; preparing a large-size graphene oxide dispersion liquid from the large-size graphene oxide and pure water; preparing a small-size graphene oxide dispersion liquid from the small-size graphene oxide and pure water; preparing a mixed graphene oxide dispersion liquid from the large-size graphene oxide dispersion liquid and the small-size graphene oxide dispersion liquid; and subjecting the mixed graphene oxide dispersion liquid to suction filtration onto a polyvinylidene fluoride support membrane under a vacuum condition to obtain the mixed graphene oxide nanofiltration membrane. According to the prepared mixed graphene oxide nanofiltration membrane, interlayer spacing is effectively reduced, a water flow path is prolonged, and salt interception efficiency is greatly improved; meanwhile, the membrane has high mechanical stability, and the interception capacity and long-term stability of dye small molecules are enhanced.

Description

technical field [0001] The present application relates to the technical field of graphene oxide nanofiltration membranes, in particular, to a mixed graphene oxide nanofiltration membrane, its preparation method and application. Background technique [0002] Graphene has been the thinnest known two-dimensional material since its discovery by Geim in 2004. [0003] After oxidizing graphene, graphene oxide is obtained, and then the graphene oxide dispersion is filtered on the base membrane by simple vacuum filtration method to form a dense graphene oxide nanofiltration membrane. Excellent mechanical stability and adjustable interlayer spacing become natural separation membrane materials. [0004] In recent years, the research on graphene oxide nanofiltration membranes has been changing with each passing day, and the results have been multiplied. Most of the research focuses on improving the flux of water treatment without reducing the membrane treatment effect. However, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/10B01D71/34C02F1/44
CPCB01D61/027B01D67/0002B01D69/10B01D71/34B01D2323/12C02F1/442
Inventor 何毅余昊侯瑞彤钟菲范毅李虹杰高艺轩马静周良
Owner 成都石大力盾科技有限公司
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