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Carbon nitride modified Janus acid-resistant nanofiltration membrane as well as preparation method and application thereof

A carbon nitride and nanofiltration membrane technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as low reaction rate and long reaction time, and achieve simple preparation methods, improved anti-pollution performance, and wide application range wide effect

Pending Publication Date: 2021-06-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polyethylene amines and cyanuric chloride are often prepared by interfacial polymerization. Although the acid resistance and acid permeability of the nanofiltration membrane prepared by this process are improved, the reaction rate is low, the reaction time is long, and the flux is low. needs to be further improved

Method used

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  • Carbon nitride modified Janus acid-resistant nanofiltration membrane as well as preparation method and application thereof
  • Carbon nitride modified Janus acid-resistant nanofiltration membrane as well as preparation method and application thereof
  • Carbon nitride modified Janus acid-resistant nanofiltration membrane as well as preparation method and application thereof

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preparation example Construction

[0022] The invention discloses a preparation method of a carbon nitride modified Janus acid-resistant nanofiltration membrane, comprising:

[0023] S1: Immerse the ultrafiltration base membrane in the prepared aqueous solution for reaction, and obtain the ultrafiltration base membrane 1 after drying; wherein, the aqueous phase solution includes the aqueous phase monomer A, the acid-binding agent, the two-dimensional nanomaterial B and Surfactant;

[0024] S2: immerse ultrafiltration base membrane 1 into the oil phase solution to react to obtain ultrafiltration base membrane 2;

[0025] S3: Ultrafiltration basement membrane 3 is obtained after ultrafiltration basement membrane 2 heat treatment;

[0026] S4: Treating the ultrafiltration base membrane with three acids to obtain a carbon nitride-modified Janus acid-resistant nanofiltration membrane.

[0027] In some embodiments of the present invention, in step S1, the concentration of the aqueous phase monomer A in the aqueous ...

Embodiment 1

[0068] Prepare 100ml of aqueous solution: weigh 1g of polyethyleneimine with a molecular weight of 1800, 0.05g of sodium dodecylsulfonate, 0.175g of C 3 N 4 Powder, add deionized water to 100ml, fully disperse and stir for 3 hours;

[0069] Prepare 100ml of oil phase solution: weigh 0.015g of cyanuric chloride, dissolve it in 100ml of n-hexane solvent, and stir thoroughly for 3 hours; soak the polyethersulfone ultrafiltration membrane soaked in deionized water in the water phase solution first 5min, take it out and dry it in the air, immerse it in the oil phase solution at 25°C for 90s, heat it at 70°C for 5min, wash it with deionized water, and then use 15wt% citric acid in a water bath at 50°C Soak for 10 minutes, and then rinse again with deionized water.

[0070] At normal temperature, measure its flux, it is 51LMH / MPa, measure its to 2g / LMgCl 2 With a rejection rate of 96%, the high-throughput C 3 N 4 The modified Janus acid-resistant nanofiltration membrane was soak...

Embodiment 2

[0072] Prepare 100ml of aqueous phase solution: weigh 1g of polyethyleneimine with a molecular weight of 1800, 0.05g of sodium dodecylsulfonate, and 0.105g of C 3 N 4 Powder, add deionized water to 100ml, fully disperse and stir for 3 hours;

[0073] Prepare 100ml of oil phase solution: weigh 0.015g of cyanuric chloride, dissolve it in 100ml of n-hexane solvent, and stir thoroughly for 3 hours; soak the polyethersulfone ultrafiltration membrane soaked in deionized water in the water phase solution first 5min, take it out and dry it in the air, immerse it in the oil phase solution at 25°C for 120s, heat it at 70°C for 5min, wash it with deionized water, and then use 15wt% citric acid in a water bath at 50°C Soak for 10 minutes, and then rinse again with deionized water.

[0074] Measure its flux at normal temperature, it is 72LMH / MPa, and measure it to 2g / LMgCl 2 The rejection rate is 96%, which is 2g / LNa 2 SO 4 The rejection of the solution was 24%.

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Abstract

The invention discloses a carbon nitride modified Janus acid-resistant nanofiltration membrane as well as a preparation method and an application thereof. The preparation method of the carbon nitride modified Janus acid-resistant nanofiltration membrane comprises the following steps: immersing an ultrafiltration base membrane into a prepared water-phase solution for reaction, and drying to obtain an ultrafiltration base membrane I; immersing the ultrafiltration base membrane I into the oil phase solution for reaction to obtain an ultrafiltration base membrane II; performing heat treatment on the ultrafiltration base membrane II to obtain an ultrafiltration base membrane III; performing three-acid treatment on the ultrafiltration base membrane, and obtaining the carbon nitride modified Janus acid-resistant nanofiltration membrane. By adding the two-dimensional carbon material carbon nitride (C3N4), narrow, smooth and mutually communicated two-dimensional channels are provided, macromolecular substances are prevented from passing through, and the water molecule transportation resistance is reduced; a composite functional layer added with the two-dimensional carbon material C3N4 is firmly loaded on the surface of the ultrafiltration base membrane by adopting an interfacial polymerization method, and the flux of the nanofiltration membrane prepared by the method is remarkably improved on the premise of ensuring the acid resistance and the rejection rate of multivalent cations.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a carbon nitride modified Janus acid-resistant nanofiltration membrane and a preparation method and application thereof. Background technique [0002] As a surface-charged separation membrane, nanofiltration membrane can not only separate substances with different molecular weights through sieving, but also selectively separate solutes through electrostatic repulsion, and its operating pressure is lower than that of reverse osmosis membranes, reducing It is a resource recovery method with simple process and obvious advantages. Therefore, in recent years, nanofiltration membrane separation technology has been widely used in many fields such as pure water preparation, desalination and desalination of seawater, recovery and removal of small molecular organic matter, enrichment and recovery of heavy metals, and industrial wastewater treatment. However, most traditional ...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00C02F1/44C02F101/20
CPCB01D61/027B01D67/0079C02F1/442C02F2101/20B01D2325/30
Inventor 王军孟芸翊俞灵张勇李魁岭曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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