A high-throughput biomimetic nanofiltration membrane based on layered graphite phase carbon nitride nanosheets and its preparation method

A phase carbon nitride and layered graphite technology, applied in the field of nanofiltration membranes, can solve the problems of inability to precisely control the surface structure, large particle size of polydopamine particles, damage to the surface morphology of the substrate, etc. Excellent property and the effect of improving hydrophilicity

Active Publication Date: 2021-02-02
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, researchers have developed a surface modification method based on polydopamine biomimetic chemistry, which can functionalize nanofiltration membranes. However, the autoxidative polymerization process of dopamine in alkaline aqueous solution is often caused by the low concentration of dissolved oxygen in the solution. However, it is very slow, and the formed polydopamine particles have a large particle size, which is easy to aggregate on the surface of the substrate, destroying the regular surface morphology of the substrate, and cannot precisely control the surface structure.
Two-dimensional layered nanosheets such as graphene and graphene oxide have a significant effect on adjusting the surface structure and properties of the film, but their preparation process is cumbersome and expensive, which limits their large-scale application.

Method used

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  • A high-throughput biomimetic nanofiltration membrane based on layered graphite phase carbon nitride nanosheets and its preparation method
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Embodiment 1

[0036] A high-throughput bionic nanofiltration membrane based on layered graphitic carbon nitride nanosheets, the preparation method thereof comprises the following steps:

[0037] 1) Immerse the polyacrylonitrile ultrafiltration membrane (12cm×12cm) in 250mL of sodium hydroxide solution with a concentration of 2mol / L for 20h hydrolysis (the SEM image of the polyacrylonitrile ultrafiltration membrane after hydrolysis is as follows: figure 1 shown), then soaked in deionized water for protonation to obtain a pretreated polyacrylonitrile ultrafiltration membrane;

[0038] 2) Add 5 g of melamine to the crucible and place it in a muffle furnace, heat it up to 600 °C at a heating rate of 5 °C / min, calcinate for 2 hours, and then grind the calcined product into powder and put it into an oxygen plasma cleaning machine. Lower treatment for 30min to obtain carbon nitride powder;

[0039] 3) Disperse 0.1 g of carbon nitride powder in 100 mL of deionized water, then ultrasonically peel f...

Embodiment 2

[0045] A high-throughput bionic nanofiltration membrane based on layered graphitic carbon nitride nanosheets, the preparation method thereof comprises the following steps:

[0046] 1) Soak the polyacrylonitrile ultrafiltration membrane (12cm×12cm) in 250mL sodium hydroxide solution with a concentration of 1.5mol / L for 25h hydrolysis, and then soak in deionized water for protonation to obtain pretreated polypropylene Nitrile ultrafiltration membrane;

[0047] 2) Add 5 g of melamine to the crucible and place it in a muffle furnace, heat it up to 550 °C at a heating rate of 4 °C / min, calcinate for 3 hours, and then grind the calcined product into powder and put it in an oxygen plasma cleaning machine. Lower treatment for 20min to obtain carbon nitride powder;

[0048] 3) Disperse 0.1 g of carbon nitride powder in 100 mL of deionized water, then ultrasonically peel for 18 h, and then centrifuge at 4000 rpm for 15 min to remove the lower layer precipitate to obtain a layered graph...

Embodiment 3

[0053] A high-throughput bionic nanofiltration membrane based on layered graphitic carbon nitride nanosheets, the preparation method thereof comprises the following steps:

[0054] 1) Soak the polyacrylonitrile ultrafiltration membrane (12cm×12cm) in 250mL sodium hydroxide solution with a concentration of 1mol / L for 28h hydrolysis, and then soak in deionized water for protonation to obtain pretreated polyacrylonitrile Ultrafiltration membrane;

[0055] 2) Add 5g of melamine into the crucible and place it in a muffle furnace, heat it up to 500°C at a heating rate of 3°C / min, calcinate for 4 hours, and then grind the calcined product into powder and put it into an oxygen plasma cleaning machine. Lower treatment for 40min to obtain carbon nitride powder;

[0056] 3) Disperse 0.1 g of carbon nitride powder in 100 mL of deionized water, then ultrasonically peel for 16 h, and then centrifuge at 5000 rpm for 5 min to remove the lower layer precipitate to obtain a layered graphite ph...

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Abstract

The invention discloses a high-flux bionic nanofiltration membrane based on layered graphite phase carbon nitride nanosheets and a preparation method thereof. The preparation method of the nanofiltration membrane comprises the following steps: 1) pretreating a polyacrylonitrile ultrafiltration membrane; 2) preparing carbon nitride powder; 3) preparing a layered graphite phase carbon nitride nanosheet dispersion liquid; 4) preparing a membrane modification solution; and 5) carrying out a co-deposition reaction of the membrane modification liquid on the pretreated polyacrylonitrile ultrafiltration membrane. The surface of the nanofiltration membrane is provided with a two-dimensional nanochannel constructed by layered graphite phase carbon nitride nanosheets, the nanofiltration membrane is excellent in hydrophilicity, large in water permeation flux and high in solute rejection rate, and the nanofiltration membrane is simple in preparation method, low in cost and stable in membrane structure and can be widely applied to the fields of wastewater treatment, material separation and purification and the like.

Description

technical field [0001] The invention relates to a high-flux bionic nanofiltration membrane based on layered graphite phase carbon nitride nanosheets and a preparation method thereof, belonging to the technical field of nanofiltration membranes. Background technique [0002] Water pollution and scarcity of water resources have seriously threatened the sustainable development of human beings. Membrane separation technology is generally regarded by the industry as the "golden key" to solve water environment problems due to its simple process, rapid separation, high efficiency and energy saving, and stable effluent quality. After decades of rapid development, membrane separation technologies (such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, etc.) have been widely used in industrial water reuse, seawater desalination, household drinking water terminal treatment, food, chemical and pharmaceutical industries. separation and purification. [0003] In rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D61/14B01D61/58B01D67/00B01D71/02B01D71/42C02F1/44C02F101/30
CPCB01D61/027B01D61/145B01D61/58B01D67/0069B01D67/0088B01D67/0093B01D71/02B01D71/42C02F1/442C02F1/444C02F2101/30
Inventor 叶文媛刘宏伟林久养周顺桂
Owner FUJIAN AGRI & FORESTRY UNIV
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