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Layer-by-layer clicked, bonded and self-assembled graphene oxide polyolefin separation membrane and preparation method thereof

An olefin polyolefin and separation membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of fouling filtrate and the modification effect is not lasting, and achieves extended service life and lasting modification effect. , a wide range of effects

Inactive Publication Date: 2014-11-12
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can avoid the harsh requirements of the traditional nanofiltration membrane preparation process. The process is simple and the conditions are easy to control. It has certain application prospects, but the modification effect is not long-lasting, and the modified membrane will pollute the filtrate during use.

Method used

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  • Layer-by-layer clicked, bonded and self-assembled graphene oxide polyolefin separation membrane and preparation method thereof
  • Layer-by-layer clicked, bonded and self-assembled graphene oxide polyolefin separation membrane and preparation method thereof
  • Layer-by-layer clicked, bonded and self-assembled graphene oxide polyolefin separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Soak a piece of about 0.01 g (f5 cm) unmodified polyolefin separation membrane (such as polyethylene, polypropylene membrane) in acetone solution for 10 hours or more, then wash it with 50% alcohol three times, half an hour each time, and dry it. Dry; the cleaned unmodified polyolefin separation membrane is placed in a clean 250 ml flask, a thermometer sleeve is plugged, sealed with a glass rod, and three extractions and three fillings are done (vacuumizing-argon filling, repeated three times) , the same below); inject 0.1 gram of bromine into the above-mentioned flask, wait for the bromine water to evaporate into bromine vapor, and expose it to ultraviolet light for 10 minutes; take out the film and wash it with ethanol / water, dry it in vacuum to obtain a brominated film.

[0030] Put the brominated membrane into a round bottom flask, add 0.1 g of sodium azide, add 100 g of tetrahydrofuran at 40 o C, shake the reaction in a shaker for 8 hours. After the reaction, the ...

Embodiment 2

[0035] Soak a piece of about 0.01 g (f5 cm) unmodified membrane in acetone solution for 10 hours, then wash it three times with 50% alcohol for half an hour each time, and dry it; put the cleaned unmodified polyolefin separation membrane on the In a clean 250ml flask, plug a thermometer sleeve, seal it with a glass rod, and do three extractions and three fillings; inject 0.2 grams of bromine into the above flask, wait for the bromine water to evaporate into bromine vapor, and then irradiate it under ultraviolet light for 20 Minutes; take out the membrane, wash it with ethanol / water, and dry it in vacuum to obtain a brominated membrane.

[0036] Put the brominated membrane into a round bottom flask, add 0.2 g of sodium azide, add 100 g of tetrahydrofuran, at 40 o C, shake the reaction in a shaker for 16 hours. After the reaction, the membrane is taken out, washed three times in water / ethanol solution, and dried in vacuum to obtain a polyolefin separation membrane with a nitrog...

Embodiment 3

[0040] Soak a piece of about 0.01 g (f5 cm) unmodified membrane in acetone solution for more than 10 hours, then wash it with 50% alcohol three times, half an hour each time, and dry it; put the cleaned unmodified membrane in a clean place. In the flask, plug the thermometer sleeve, seal it with a glass rod, and do three extractions and three fillings; inject 0.5 grams of bromine into the 250 ml flask, at this time, the bromine water evaporates into bromine vapor, and irradiate under the ultraviolet light for 60 minutes ; Take out the film and wash it with ethanol / water, dry it in vacuum to obtain the brominated film.

[0041] Put the brominated membrane into a round bottom flask, add 0.5 g of sodium azide, add 100 g of tetrahydrofuran, at 40 o C, shake the reaction in a shaker for 24 hours. After the reaction, the membrane is taken out, washed three times in water / ethanol solution, and dried in vacuum to obtain a polyolefin separation membrane with a nitrogen group.

[0042...

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Abstract

The invention relates to the technical field of chemical engineering and in particular relates to a layer-by-layer clicked, bonded and self-assembled graphene oxide polyolefin separation membrane and a preparation method thereof. The preparation method comprises the following steps: mixing an unmodified polyolefin separation membrane with bromine and irradiating bromine by ultraviolet light so as to prepare a bromo-membrane; performing nucleophilic substitution on the bromo-membrane and sodium azide to prepare a polymer membrane with an azide group; preparing graphene oxide with the azide group and alkynyl by using open-looping and condensation methods; performing layer-by-layer clicking, bonding and self-assembling on the graphene oxide with the azide group and alkynyl to be formed onto the surface of the polyolefin separation membrane with the azide group, thereby achieving layer-by-layer clicking and self-assembling modification on graphene oxide on the surface of the polyolefin separation membrane. The preparation method is a universal method for polyolefin separation membrane surface modification. The hydrophilia and the anti-pollution property of the polymer membrane are improved, the polyolefin separation membrane is permanently modified, and thus the polyolefin separation membrane can be widely applied to the field of chemical engineering.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a method for bonding graphene oxide to the surface of a polyolefin separation membrane through layer-by-layer click bonding self-assembly and a modified membrane produced by the method. Background technique [0002] Graphene oxide (Graphene Oxide, GO) has excellent dispersibility, hydrophilicity and compatibility with polymers, and has broad application prospects in the preparation of inorganic-organic composite membranes and the modification of polymer separation membranes. Graphene oxide is an oxidized derivative of graphene. It has a huge specific surface area and a two-dimensional sheet structure with a thickness of about 1 nanometer. There are phenolic hydroxyl groups and epoxy groups on the base surface, and hydrophilic groups such as carboxyl groups on the sides. Highly hydrophobic and hydrophilic on the outside. The hydrophilic group on the outside is not only conducive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D69/00
Inventor 宇海银顾家山张振北朱军张健
Owner ANHUI NORMAL UNIV
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