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Surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane and preparation method thereof

A carbon nitride-based, photocatalytic technology, applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as difficulty in forming a homogeneous membrane, difficulty in eliminating membrane pollution, etc., achieve mild operating conditions, and improve anti-pollution performance , the effect of simple preparation method

Active Publication Date: 2019-04-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the difficult problems that traditional nanofiltration membranes are difficult to eliminate membrane fouling and carbon nitride photocatalysts are difficult to form homogeneous membranes, and provides a method based on the modification of transition metal-containing Fenton-like reagents to realize coupled oxidation of photocatalysis and Fenton-like reactions. Multifunctional nanofiltration membrane and preparation method thereof

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  • Surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane and preparation method thereof
  • Surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane and preparation method thereof
  • Surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane and preparation method thereof

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Embodiment 1

[0047] Embodiment 1, preparation of the Fenton-photocatalytic nanofiltration membrane based on carbon nitride and iron-containing Fenton reagent

[0048] A method for preparing a Fenton-photocatalytic nanofiltration membrane based on carbon nitride and iron-containing Fenton reagents, the method comprising the following steps:

[0049] Step 1: Using melamine as a nitrogen-containing precursor, thermal polymerization was carried out in a high-temperature furnace at 550° C. for 4 hours to prepare graphite-phase carbon nitride.

[0050] Step 2: Disperse the graphene carbon nitride in step 1 in an isopropanol solvent, use an ultrasonic device to perform liquid phase stripping, and centrifuge at a high speed of 5000 rpm for 10 minutes to remove the bulk phase that has not been fully stripped carbon nitride to obtain well-dispersed carbon nitride nanosheets as a film-forming solution.

[0051] Step 3: Prepare a Fenton-like reaction precursor solution by using ferric chloride and ph...

Embodiment 2

[0056] Embodiment 2, preparation of the Fenton-photocatalytic nanofiltration membrane based on carbon nitride and iron-containing Fenton reagent

[0057] A method for preparing a Fenton-photocatalytic nanofiltration membrane based on carbon nitride and iron-containing Fenton reagents, the method comprising the following steps:

[0058] Step 1: Urea is used as a nitrogen-containing precursor, and thermal polymerization is carried out in a high-temperature furnace at 550° C. for 4 hours to prepare graphite-phase carbon nitride.

[0059] Step 2: The graphene carbon nitride in step 1 is subjected to molecular tailoring in a concentrated sodium hydroxide solution, the reaction solution is treated by dialysis to remove impurity ions, and the solution after dialysis is centrifuged at 1500 rpm for 10 Minutes, a well-dispersed carbon nitride sol was obtained as a film-forming solution.

[0060] Step 3: Prepare a Fenton-like reaction precursor solution with ferric chloride and phosphot...

Embodiment 3

[0065] Embodiment 3, preparation of Fenton-like photocatalytic nanofiltration membrane based on carbon nitride and iron-containing Fenton reagent

[0066] A method for preparing a Fenton-photocatalytic nanofiltration membrane based on carbon nitride and iron-containing Fenton reagents, the method comprising the following steps:

[0067] Step 1: Using melamine as a nitrogen-containing precursor, thermal polymerization was carried out in a high-temperature furnace at 550° C. for 4 hours to prepare graphite-phase carbon nitride.

[0068] Step 2: The graphene carbon nitride in step 1 is subjected to molecular tailoring in a concentrated sodium hydroxide solution, the reaction solution is treated by dialysis to remove impurity ions, and the solution after dialysis is centrifuged at 1500 rpm for 10 Minutes, a well-dispersed carbon nitride sol was obtained as a film-forming solution.

[0069] Step 3: Using ferric chloride as the Fenton-like reagent precursor, mix the carbon nitride ...

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Abstract

The invention discloses a surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane and a preparation method thereof and belongs to the fields of water treatment membrane materials and preparation processes of the water treatment membrane materials. The method comprises selecting carbon nitride photocatalysts which integrate plasticity of polymer molecules and chemical stability of carbon materials and performing surface modification, chemical modification, Fenton-like agent compounding and the like to prepare a multifunctional water treatment membrane. On the one hand, inter-element triangular nanopores formed by carbon nitride can provide stable natural channels for rapid passage of water molecules; on the other hand, through irradiated catalytic degradation andiron-containing agent Fenton-like oxidation, in-situ degradation of nanofiltration retained pollutants can be achieved. The surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane provides a new way for solving the problem of membrane contamination difficult for traditional nanofiltration membrane materials and has the advantages of being simple in preparation method, low in cost, resistant to pollution, low in water mass transfer resistance and the like, thereby being applicable to application to the field of water purification.

Description

technical field [0001] The invention relates to a water quality purification membrane material and a preparation technology thereof, in particular to a surface self-cleaning carbon nitride-like Fenton-photocatalytic nanofiltration membrane and a preparation method thereof. Background technique [0002] As a new membrane separation process between ultrafiltration and reverse osmosis, nanofiltration can effectively intercept divalent and high-valent ions, dyes, small organic molecules, antibiotics, etc. under low pressure, so it has a huge role in the field of water treatment application prospects. However, nanofiltration membrane water treatment technology still faces problems such as high cost, decreased flux caused by membrane fouling, and deterioration of water quality. It is particularly important to find a feasible way to solve the problem of membrane fouling while developing new membrane materials [EnergyEnviron. Sci.2011,4,1946]. Studies have shown that NOM, organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/10B01D71/02B01D67/00C02F1/44C02F1/30C02F1/72
CPCB01D61/027B01D67/0088B01D69/02B01D69/10B01D71/02B01D2325/10C02F1/30C02F1/442C02F1/722C02F2305/026C02F2305/10
Inventor 安晓强兰华春王峰刘锐平刘会娟曲久辉
Owner TSINGHUA UNIV
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