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Composite carbon material membrane, composite carbon material nanofiltration membrane and preparation method

A composite carbon and material membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of small water flux, complicated process, and low efficiency of nanofiltration membranes

Active Publication Date: 2021-04-09
深圳前海石墨烯产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, nanofiltration membranes made of graphene and its derivatives usually have the disadvantage of low water flux.
Moreover, limited by the intrinsic properties of graphene, vacuum filtration and spin coating methods are usually used to form the surface separation layer on the surface of the base film in the traditional technology, but the process of these two methods is relatively complicated and the efficiency is low. Suitable for industrial mass production

Method used

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preparation example Construction

[0031] In order to realize the large-scale preparation of nanofiltration membranes comprising graphene oxide materials by scrap coating, and simultaneously improve the water flux of the nanofiltration membranes, the invention provides a method for preparing nanofiltration membranes of composite carbon materials, which comprises the following steps .

[0032] The graphene oxide and carboxylated carbon nanotubes are uniformly mixed in a dispersant to prepare a graphene oxide-carbon nanotube mixed liquid.

[0033] Scrape-coat the graphene oxide-carbon nanotube mixture on the base membrane, and remove the dispersant in the graphene oxide-carbon nanotube mixture to prepare a composite carbon material membrane precursor, where the base membrane is an ultrafiltration base membrane .

[0034] The graphene oxide in the composite carbon material film precursor is reduced by ultraviolet light irradiation and reduction.

[0035] It can be understood that in other embodiments, the base f...

Embodiment 1

[0079] Add 50 μL of carboxylated carbon nanotube dispersion (0.5 g / L) into 300 mL of deionized water for ultrasonic dispersion for 30 minutes, then add 400 μL of self-made graphene oxide aqueous dispersion (0.5 g / L), and mix well to obtain graphene oxide- Carbon nanotube mixture;

[0080] Using a stainless steel scraper, the graphene oxide-carbon nanotube mixture is uniformly scraped and coated on the polyvinylidene fluoride ultrafiltration base membrane, and left standing at room temperature to evaporate the water therein to obtain a composite carbon material membrane precursor.

[0081] A 500W high-power mercury lamp was used to irradiate the composite carbon material film precursor for 5 hours, the whole film was shrouded in high-purity hydrogen, and the radiation source was 40 cm away from the film to obtain a partially reduced nanofiltration membrane.

Embodiment 2

[0083] Add 100 μL of carboxylated carbon nanotube dispersion (0.5 g / L) into 300 mL of deionized water for ultrasonic dispersion for 30 minutes, then add 400 μL of self-made graphene oxide aqueous dispersion (0.5 g / L), and mix well to obtain graphene oxide- Carbon nanotube mixture;

[0084] Using a stainless steel scraper, the graphene oxide-carbon nanotube mixture is uniformly scraped and coated on the polyvinylidene fluoride ultrafiltration base membrane, and left standing at room temperature to evaporate the water therein to obtain a composite carbon material membrane precursor.

[0085] A 500W high-power mercury lamp was used to irradiate the composite carbon material film precursor for 5 hours, the whole film was shrouded in high-purity hydrogen, and the radiation source was 40 cm away from the film to obtain a partially reduced nanofiltration membrane.

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Abstract

The invention discloses a composite carbon material membrane, a composite carbon material nanofiltration membrane and a preparation method. The preparation method of the composite carbon material membrane comprises the following steps: uniformly mixing graphene oxide and carboxylated carbon nanotubes in a dispersing agent to prepare a graphene oxide and carbon nanotube mixed solution; scraping and coating the graphene oxide and carbon nanotube mixed solution on a base material, and removing the dispersing agent in the graphene oxide and carbon nanotube mixed solution to prepare a composite carbon material film precursor; and in a reducing gas atmosphere, adopting ultraviolet irradiation to reduce the graphene oxide in the composite carbon material film precursor. The carboxylated carbon nanotubes can increase the interlayer spacing between graphene oxide sheet layers and improve the water flux of the membrane; moreover, by adopting the unreduced graphene oxide and carboxylated carbon nanotubes, a surface separation layer which is uniformly coated can be formed on the base membrane through blade coating, and large-scale production and preparation are facilitated.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a composite carbon material membrane, a composite carbon material nanofiltration membrane and a preparation method. Background technique [0002] Nanofiltration membrane (Nanofiltration Membranes) is a separation membrane that appeared in the late 1980s. The surface of the nanofiltration membrane usually has pores of about 1 nm, and the molecular weight cut-off is about 200-2000. It can intercept many small molecular organic compounds and partially soluble Salt, the interception capacity is between the reverse osmosis membrane and the ultrafiltration membrane. Although the interception capacity of the nanofiltration membrane is worse than that of the reverse osmosis membrane, the water flux of the nanofiltration membrane is higher and the cost is lower, which can replace the reverse osmosis membrane in many applications. [0003] In traditional technologies, nanofiltration mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D71/02
CPCB01D61/027B01D67/0079B01D71/021
Inventor 潘登谢子奇张云宝张浩轩
Owner 深圳前海石墨烯产业有限公司