Preparation method of polymeric micelle nanofiltration membrane and application thereof

A technology of polymer micelles and nanofiltration membranes, applied in the field of membrane separation, to achieve the effects of simple and easy methods, saving membrane production costs, and less polymer content

Active Publication Date: 2018-10-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to prepare block copolymer membranes, but the membrane production methods that ensure the high performance of the membrane while ensuring energy consumption and minimizing environmental pollution are still being further improved

Method used

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  • Preparation method of polymeric micelle nanofiltration membrane and application thereof
  • Preparation method of polymeric micelle nanofiltration membrane and application thereof
  • Preparation method of polymeric micelle nanofiltration membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041](a) Weigh 10mg of polystyrene-block-polyacrylic acid (15000-b-1600g / mol), dissolve in 1ml of N,N-dimethylformamide solution, and / min stirring speed stirring for 12h, followed by adding methanol to dilute 4 times to obtain well-dispersed spherical micelles. Then, zinc acetate hexahydrate (2 mg / ml) prepared with methanol was added in an amount of 100 μl per 4 ml of solvent. Finally, through vacuum filtration, the micellar solution is spread on the macroporous substrate polycarbonate to obtain a complete spherical micellar film.

[0042] (b) Cut the spherical micellar membrane into discs of appropriate size (d=2.5cm), put them into a filter device, insert ultrapure water, give a certain pressure (1bar), and measure the unit area under this pressure. , the time required to flow out a unit volume of ultrapure water, from which the pure water flux is calculated according to the following formula. J=V / (A*Δt). Among them, V is the volume of the effluent, A is the effective a...

Embodiment 2

[0050] (a) Weigh 10mg of polymer poly-4-vinylpyridine-block-polystyrene-block-poly-4-vinylpyridine (4500-b-27000-b-4500g / mol), dissolve it in 0.2ml In toluene and 0.8ml methanol, stir at room temperature (18-20°C) at a stirring speed of 500r / min for 12 hours, then add methanol to dilute 5 times to obtain well-dispersed columnar micelles. Finally, the micellar solution was spread on the macroporous substrate polycarbonate by vacuum filtration technology to obtain a complete columnar micellar film.

[0051] (b) Cut the columnar micellar membrane into discs of appropriate size (d=2.5cm), put them into the filter device, add 10nm gold particles to it, give a certain pressure (1bar), and analyze the membrane by ultraviolet spectrum and transmission electron microscope Measure the effluent and stock solution.

[0052] Depend on Figure 5 It can be seen that the surface of the membrane produced in Example 2(a) is composed of many columnar fibers, which are covered interlacedly to f...

Embodiment 3

[0055] (a) Weigh 5mg of the polymer polystyrene-block-polyacrylic acid (15000-b-1600g / mol), dissolve it in 0.5ml of toluene and 0.7ml of methanol, at room temperature (18-20°C) at 500r / min Stir at the stirring speed for 12 hours, and then add methanol to dilute 2 times to obtain well-dispersed lamellar micelles.

[0056] Depend on Figure 7 It can be seen that the surface of the membrane prepared in Example 3(a) is composed of sheets with uniform size, and the morphology is good.

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Abstract

The invention discloses a preparation method of a polymeric micelle nanofiltration membrane and application thereof, which belongs to the field of porous material separation membranes. The polymer membrane is mainly attached to a macroporous substrate, and a polycarbonate membrane is chosen as the substrate layer. The preparation method of the micelle membrane comprises the following steps: a polymer with an appropriate block proportion and molecular weight is chosen to be dissolved in selective solvent, so that a micelle solution with a specific morphology is formed; the micelle solution is uniformly dispersed, spread onto the macroporous substrate by the vacuum filtration technology and naturally dried, and thereby the block copolymer separation membrane prepared by the dilute micelle solution is obtained. The voids formed between the piled micelles serve as part of membrane pores, thus playing the role of selective separation, while the macroporous substrate of the lower layer helpsincrease the separation efficiency of the membrane. Most of the current methods for preparing polymer membranes are complex and consume a great deal of energy. The membrane production method is universal and simple, the needed cost is low, and moreover, the produced membrane has high separation efficiency, and can be applied to the separation of different sizes of gold nanoparticles.

Description

technical field [0001] The invention relates to the preparation and application of a high-performance polymer membrane, and in particular provides a simple, feasible, and raw material-saving membrane-making method, which belongs to the technical field of membrane separation. Background technique [0002] With the increasingly serious problems of energy, water resources and environmental protection, membrane science and technology have gained more and more attention. Membrane technology is a new type of high-efficiency separation technology. Due to its functions of separation, concentration, purification and refining, it has been widely used in food, medicine, metallurgy, chemical industry, water treatment and other fields due to its high efficiency, energy saving and environmental protection. However, there are problems such as high energy consumption, expensive raw materials, and low separation efficiency in the membrane production process. Therefore, it is of great signif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D69/02B01D67/00C02F1/44C02F101/20
CPCB01D61/027B01D67/0002B01D69/02B01D71/80B01D2325/02C02F1/442C02F2101/20
Inventor 于海洲张婉娜
Owner NANJING UNIV OF TECH
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