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Positively charged graphene oxide/quaternized chitosan composite nanofiltration membrane prepared through layer-by-layer self-assembly and preparation method of nanofiltration membrane

A technology of quaternized chitosan and layer-by-layer self-assembly, applied in the field of separation membranes, can solve the problems of large impact on membrane performance, insufficient environmental protection polyacrylamide, complicated preparation steps, etc., and achieves good interception effect and hydrophilicity. And the effect of good anti-fouling performance and good removal effect

Inactive Publication Date: 2017-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201410467041.1 discloses a preparation method of chitosan / graphene oxide / hydroxyapatite / polyacrylamide composite material. The composite film is prepared by solution mixing phase change method, and polyacrylamide which is not environmentally friendly is used.
Chinese patent 201310482626.6 discloses a method for preparing a quaternized chitosan-modified polysulfone ultrafiltration membrane. The ultrafiltration membrane is prepared by blending and coating the solution, and the preparation steps are complicated. At the same time, different The proportion distribution of the casting solution has a great influence on the performance of the membrane

Method used

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  • Positively charged graphene oxide/quaternized chitosan composite nanofiltration membrane prepared through layer-by-layer self-assembly and preparation method of nanofiltration membrane
  • Positively charged graphene oxide/quaternized chitosan composite nanofiltration membrane prepared through layer-by-layer self-assembly and preparation method of nanofiltration membrane
  • Positively charged graphene oxide/quaternized chitosan composite nanofiltration membrane prepared through layer-by-layer self-assembly and preparation method of nanofiltration membrane

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Experimental program
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Effect test

Embodiment 1

[0023] The refined HTCC sample was dissolved in deionized water to prepare a HTCC cationic casting solution with a mass concentration of 5 mg / mL. Weigh the graphite oxide sample and dissolve it in deionized water. Under the condition of 60W, ultrasonically peel it for 3h, let it stand overnight, and then take the upper layer dispersion to make the mass concentration of 0.25mg / mL, 0.5mg / mL, 0.75mg / mL, 1.0mg / mL, 1.5mg / mL GO anion casting solution, adjust the pH to about 4 with acid and alkali. Take 6 polyethersulfone ultrafiltration membranes, soak them in the cationic polyelectrolyte solution for 15 minutes, and then wash them in deionized water for 1 minute to remove excess polyelectrolyte on the surface of the composite membrane. It was then soaked in an anionic polyelectrolyte solution for 20 min, and then washed in deionized water for 1 min to complete a double layer. Repeat the above steps to prepare 1.5, 2.5, 3.5, 4.5, 5.5, 6.5 double layer composite membranes. The obta...

Embodiment 2

[0026]The refined HTCC sample was dissolved in deionized water to prepare a HTCC cationic casting solution with a mass concentration of 5 mg / mL. Weigh the graphite oxide sample and dissolve it in deionized water. Under the condition of 60W, it will be ultrasonically stripped for 3h, and it will be left standing overnight. pH to 4. Take 6 pieces of polyethersulfone ultrafiltration membranes, soak 6 pieces in cationic polyelectrolyte solution for 15 minutes, and then wash in deionized water for 1 minute to remove excess polyelectrolyte on the surface of the composite membrane. It was then soaked in an anionic polyelectrolyte solution for 20 min, and then washed in deionized water for 1 min to complete a double layer. Repeat the above steps to complete the preparation of 1.5, 2.5, 3.5, 4.5, 5.5, 6.5 double layers soaked in the cationic solution first. The obtained wet film was placed at 50°C for solvent evaporation for 30 min. Then, soak the 6 pieces of dry film in the cross-l...

Embodiment 3

[0029] The refined HTCC sample was dissolved in deionized water to prepare a HTCC cationic casting solution with a mass concentration of 5 mg / mL. Weigh the graphite oxide sample and dissolve it in deionized water. Under the condition of 60W, it will be ultrasonically stripped for 3h, and it will be left standing overnight. pH to 4. Take 4 pieces of polyethersulfone ultrafiltration membranes, soak 4 pieces in the cationic polyelectrolyte solution for 15 minutes, and then wash in deionized water for 1 minute to remove excess polyelectrolyte on the surface of the composite membrane. It was then soaked in an anionic polyelectrolyte solution for 20 min, and then washed in deionized water for 1 min to complete a double layer. Repeat the above steps to complete the preparation of 4.5 bilayers soaked in the cationic solution first. Dry the wet film at 50°C for 30 min, and soak 4 pieces of dry film in an alternating solution of (ECH / ethanol) (0.6mL / 50mL) with a pH of about 8-9 adjust...

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Abstract

The invention discloses a preparation method of a positively charged graphene oxide / quaternized chitosan composite nanofiltration membrane prepared through layer-by-layer self-assembly. The method comprises the step that the positively charged graphene oxide / quaternized chitosan composite nanofiltration membrane is prepared through a layer-by-layer self-assembly method by taking positively charged 2-hydroxypropyltrimethyl ammonium chloride chitosan as a polycation electrolyte, taking graphene oxide as a polyanion electrolyte, taking a polyethersulfone ultrafiltration membrane which is good in hydrophilic performance as a supporting layer and taking epichlorohydrin as a cross-linking agent. The preparation method is simple, natural, environmentally friendly and good in stability, the prepared positively charged composite nanofiltration membrane has the good hydrophilic performance and the excellent separating effect, the pure water permeability coefficient is 24.02 L.h<-1>.m<-2>.Mpa, the molecular weight cut-off is 1,313, and the molecular weight cut-off of the nanofiltration membrane ranges from 150 to 2,000, and the prepared positively charged composite nanofiltration membrane belongs to the nanofiltration membrane category. The composite membrane has the high retention rate on high-valence cation compounds and can be used for treatment of micro-balanced pollutants in a water environment and particularly separating and removing of positively charged materials.

Description

technical field [0001] The invention relates to a layer-by-layer self-assembled composite nanofiltration membrane and a preparation method thereof, in particular to a layer-by-layer self-assembled graphene oxide / quaternized chitosan positively charged composite nanofiltration membrane and a preparation method thereof, belonging to separation Membrane technology field. Background technique [0002] Graphene is a highly ordered two-dimensional honeycomb structure composed of a single layer of sp2 hybridized carbon atoms, with high mobility, large specific surface area, good light transmission, high Young's modulus and excellent thermal conductivity and other superior physical and chemical properties. Graphene oxide (GO), as the synthetic precursor of graphene, has a skeleton structure similar to that of graphene. Its basal surface contains a large number of hydroxyl and epoxy groups, and there are carboxyl groups on the edge, which has good hydrophilicity. Has good dispersib...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D69/12B01D69/02B01D71/02B01D71/68
CPCB01D61/027B01D67/0079B01D69/02B01D69/125B01D71/021B01D71/68B01D2325/26B01D2325/36
Inventor 黄中华蒋正飞李娜李梦坤汤欣源欧阳志宇
Owner NANJING UNIV OF SCI & TECH
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