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Preparation method of CNT-modified nanofiltration membrane

A nanofiltration membrane and modification technology, which is applied in the field of nanofiltration membranes, can solve the problems of low water flux and retention rate, and achieve the effects of improving hydrophilic performance, enhancing hydrophilicity, and increasing strength

Active Publication Date: 2016-08-03
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of low water flux and retention rate in the nanofiltration membrane produced by the existing interfacial polymerization process, and then provide a kind of membrane with large water flux, high retention rate and hydrophilic Preparation method of nanofiltration membrane with good properties

Method used

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  • Preparation method of CNT-modified nanofiltration membrane
  • Preparation method of CNT-modified nanofiltration membrane

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Embodiment 1

[0028] The preparation method of the CNT modified nanofiltration membrane described in this embodiment comprises the following steps:

[0029] (1) Add anhydrous sodium phosphate, anhydrous piperazine and CNT dispersion liquid successively to a certain amount of deionized water, stir to make it dissolve completely and form an aqueous phase solution, which contains 1wt% sodium phosphate, 1wt% Piperazine, 3wt% CNT dispersion and 95wt% water, wherein, CNT accounts for 0.1wt% in the CNT dispersion, and the balance is deionized water;

[0030] (2) dissolving trimesoyl chloride in n-hexane to form an organic phase solution in which trimesoyl chloride accounts for 0.15 wt %;

[0031] (3) Fix the polysulfone ultrafiltration membrane on the corrosion-resistant polyethylene splint, pour the aqueous phase solution of step (1) into the surface of the membrane surface A on one side of the membrane, and make the aqueous phase solution covered with Membrane surface A, after keeping for 120s,...

Embodiment 2

[0034] The preparation method of the CNT modified nanofiltration membrane described in this embodiment comprises the following steps:

[0035] (1) Add anhydrous sodium phosphate, anhydrous piperazine and CNT dispersion liquid successively to a certain amount of deionized water, stir to make it dissolve completely to form water phase solution, contain the sodium phosphate of 1.5wt%, 0.5% in this water phase solution wt% piperazine, 3wt% CNT dispersion and 95wt% water, wherein CNT accounts for 0.1wt% in the CNT dispersion, and the balance is dimethylformamide;

[0036] (2) dissolving trimesoyl chloride in n-hexane to form an organic phase solution in which trimesoyl chloride accounts for 0.25 wt %;

[0037] (3) Fix the polysulfone ultrafiltration membrane on the corrosion-resistant polyethylene splint, pour the aqueous phase solution of step (1) into the surface of the membrane surface A on one side of the membrane, and make the aqueous phase solution covered with Membrane surf...

Embodiment 3

[0040] The preparation method of the CNT modified nanofiltration membrane described in this embodiment comprises the following steps:

[0041](1) Add anhydrous sodium phosphate, anhydrous piperazine and CNT dispersion liquid successively to a certain amount of deionized water, stir to make it dissolve completely and form an aqueous phase solution, containing 1.5wt% sodium phosphate, 1wt% in this aqueous phase solution % piperazine, 2.5wt% CNT dispersion and 95wt% water, wherein CNT accounts for 0.1wt% in the CNT dispersion, and the balance is ethanol;

[0042] (2) dissolving trimesoyl chloride in n-hexane to form an organic phase solution in which trimesoyl chloride accounts for 0.3 wt %;

[0043] (3) Fix the polysulfone ultrafiltration membrane on the corrosion-resistant polyethylene splint, pour the aqueous phase solution of step (1) into the surface of the membrane surface A on one side of the membrane, and make the aqueous phase solution covered with Membrane surface A, a...

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Abstract

The invention provides a preparation method of a CNT-modified nanofiltration membrane. The preparation method comprises the following steps: covering the surface of one side of a porous support membrane with a CNT-containing aqueous phase solution, an organic phase solution and the CNT-containing aqueous phase solution in sequence; taking out and drying the membrane after reaction for a period of time; heat-treating and soaking the membrane in water to obtain the CNT-modified nanofiltration membrane. Compared with a conventional interfacial polymerization process, the preparation method provided by the invention has the characteristics that a polymer surface layer is formed on one side of the porous support membrane, which is conducive to better play a separation role of the nanofiltration membrane; an appropriate amount of CNT is dispersed in the aqueous phase solution, while a step of secondary infiltration of an aqueous phase is added, to not only optimize the mechanical properties of the nanofiltration membrane, more importantly, significantly enhance the hydrophilicity, water flux and retention rate of the nanofiltration membrane, so that the nanofiltration membrane prepared according to the preparation method has an excellent industrial production basis and a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and in particular relates to a preparation method of a CNT modified nanofiltration membrane. Background technique [0002] Nanofiltration technology is a membrane separation technology between ultrafiltration and reverse osmosis. This technology can cut off substances with a molecular weight of about 200-2000Da. It is widely used in water softening, solution decolorization, dye desalination and concentration, and purification of biochemical substances. Concentration etc. The key to nanofiltration technology lies in the nanofiltration membrane, which is an asymmetric composite membrane composed of two parts: one part is a porous membrane that plays a supporting role, and its mechanism is sieving, and the other part is a part that plays a separating role. The separation mechanism of the thinner dense membrane can be explained by the theory of dissolution and diffusion. By optimizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/10B01D67/00
CPCB01D67/0002B01D69/10B01D71/68B01D2323/12B01D2323/22B01D2325/36
Inventor 黄万抚李新冬梁娟安占涛
Owner JIANGXI UNIV OF SCI & TECH
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