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Preparation method of functionalized carbon quantum dot modified composite nanofiltration membrane

A technology of composite nanofiltration membrane and functionalized carbon, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve problems such as the performance impact of composite nanofiltration membrane, achieve excellent anti-pollution performance, good industrial production basis, good Effect of Salt Retention Capacity

Active Publication Date: 2018-08-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these works are all focused on carbon quantum (unfunctionalized) prepared by a single carbon source, and there is no research report on the preparation of functionalized quantum dots to prepare composite nanofiltration membranes, and the functional groups on the surface of particles have a greater impact on the performance of composite nanofiltration membranes. Impact

Method used

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  • Preparation method of functionalized carbon quantum dot modified composite nanofiltration membrane
  • Preparation method of functionalized carbon quantum dot modified composite nanofiltration membrane

Examples

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Effect test

Embodiment 1

[0020] A preparation method of a composite nanofiltration membrane modified by functionalized carbon quantum dots:

[0021] (1) Stir and dissolve citric acid and sodium polyethylene sulfonate (mass ratio is 2:1) in water, then remove the water to obtain a mixed powder of citric acid and polyethylene sulfonic acid; then, place the above mixed powder in Under a nitrogen atmosphere, pyrolyze at 200°C for 2 hours, wait for it to cool naturally, disperse the obtained brown product in water, purify by dialysis, and freeze-dry to obtain functionalized carbon quantum dots, such as figure 1 shown;

[0022] (2) Preparation of aqueous phase solution: Dissolve piperazine with a concentration of 1wt%, and 0.1wt% sodium hydroxide in deionized water, then add functionalized carbon quantum dots with a concentration of 0.05wt%, and ultrasonically disperse them evenly for 5 minutes ;Immerse the wet polysulfone support membrane into the aqueous phase solution for 10 minutes, take it out, roll t...

Embodiment 2

[0026] A preparation method of a composite nanofiltration membrane modified by functionalized carbon quantum dots:

[0027] (1) Stir and dissolve citric acid and sodium polyethylene sulfonate (mass ratio is 2:1) in water, then remove the water to obtain a mixed powder of citric acid and polyethylene sulfonic acid; then, place the above mixed powder in Under nitrogen atmosphere, pyrolyze at 200°C for 2 hours, wait for it to cool naturally, disperse the obtained brown product in water, purify by dialysis, and freeze-dry to obtain functionalized carbon quantum dots;

[0028] (2) Preparation of aqueous phase solution: Dissolve piperazine with a concentration of 1wt%, and 0.1wt% sodium hydroxide in deionized water, then add functionalized carbon quantum dots with a concentration of 0.1wt%, and ultrasonically disperse them evenly for 5 minutes ;Immerse the wet polysulfone support membrane into the aqueous phase solution for 10 minutes, take it out, roll the surface of the support me...

Embodiment 3

[0032] A preparation method of a composite nanofiltration membrane modified by functionalized carbon quantum dots:

[0033] (1) Stir and dissolve citric acid and sodium polyethylene sulfonate (mass ratio: 2:1) in water, then remove the water to obtain a mixed powder of citric acid and polyethylene sulfonic acid; then, place the above mixed powder in Under nitrogen atmosphere, pyrolyze at 200°C for 2 hours, wait for it to cool naturally, disperse the obtained brown product in water, purify by dialysis, and freeze-dry to obtain functionalized carbon quantum dots;

[0034] (2) Preparation of aqueous phase solution: Dissolve piperazine with a concentration of 1wt%, and 0.1wt% sodium hydroxide in deionized water, then add functionalized carbon quantum dots with a concentration of 0.15wt%, and ultrasonically disperse them evenly for 5 minutes ;Immerse the wet polysulfone support membrane into the aqueous phase solution for 10 minutes, take it out, roll the surface of the support mem...

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Abstract

The invention discloses a preparation method of a functionalized carbon quantum dot modified composite nanofiltration membrane. The preparation method is characterized by comprising the following steps of dissolving citric acid and sodium polystyrene sulfonate into water, and then removing water to obtain mixed powder of the citric acid and the sodium polystyrene sulfonate which is uniformly mixed; then pyrolyzing the mixed powder to obtain functionalized carbon quantum dots; respectively preparing the functionalized carbon quantum dots into a water-phase solution and an oil-phase solution; and sequentially soaking a porous supporting membrane into the water-phase solution and the oil-phase solution for reaction, and enabling the surface of the porous supporting membrane to generate a functionalized carbon quantum dot loaded aromatic polymer functional skin layer to obtain the functionalized carbon quantum dot-containing composite nanofiltration membrane. By adopting the preparation method provided by the invention, the functionalized carbon quantum dots are good loaded on the membrane, so that improvement in water flux, hydrophilicity and antifouling property of the composite membrane is facilitated, and relatively high inorganic salt retention rate is kept. The preparation method is simple, is relatively low in production cost, is remarkably improved in membrane comprehensiveperformance and has a good industrial production basis and a wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane modified by functionalized carbon quantum dots, and belongs to the technical field of membranes. Background technique [0002] Nanofiltration is a membrane process between reverse osmosis and ultrafiltration, with pore sizes in the range of a few nanometers. The nanofiltration process has a high rejection rate for divalent or polyvalent inorganic ions and organic compounds with a molecular weight between 200-1000 Da. It is widely used in industrial production and daily life, including drinking water softening, solution decolorization, and dye removal. The concentration of salt and the purification and concentration of biochemical substances have produced certain economic and social benefits. However, the widely used pure polymer nanofiltration membranes generally have problems of low flux and poor anti-fouling performance. Combining inorganic nanoparticle materials i...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D61/027B01D67/0002B01D69/02B01D69/12B01D71/82B01D2325/30B01D2325/48
Inventor 武培怡孙华圳
Owner DONGHUA UNIV
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