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Layer-by-layer self-assembled graphene oxide nanofiltration membrane and preparation method thereof

A layer-by-layer self-assembly, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Prospect, good interception effect

Active Publication Date: 2016-01-27
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent with the publication number of 102989330A adds a small amount of graphene and uses the traditional interfacial polymerization process to prepare polymer / graphene hybrid nanofiltration composite membranes, which is similar to adding carbon nanotubes to the traditional interfacial polymerization process to prepare nanofiltration membranes , graphene is only used as an additive material to improve the performance of nanofiltration membranes to a certain extent; similar invention patents include Chinese patent with publication number 102989331A and Chinese patent with publication number 103338845A, both of which use traditional interfacial polymerization technology, adding a small amount Graphene improves the performance of the membrane. These hybrid nanofiltration composite membranes are not real graphene oxide nanofiltration membranes, do not have their characteristics, and are still not widely used in water treatment.

Method used

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  • Layer-by-layer self-assembled graphene oxide nanofiltration membrane and preparation method thereof
  • Layer-by-layer self-assembled graphene oxide nanofiltration membrane and preparation method thereof
  • Layer-by-layer self-assembled graphene oxide nanofiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] 1. Hummers method prepares graphene oxide solution

[0029] Put 1g of expandable graphite in a three-necked flask, add 100ml of concentrated sulfuric acid into the three-necked flask, and keep the temperature of the mixture below 4°C in an ice-water bath, then slowly add 3g of potassium permanganate, continue stirring in the ice-water bath for 30min, and then Raise the temperature to 30-40°C in a constant temperature water bath, stir for 2.5 hours; slowly add deionized water to the three-necked flask until no bubbles are generated in the reaction system, ensure that the reaction system does not boil during the dropwise addition, and place it in a constant temperature water bath after the dropwise addition Raise the temperature to 90-100°C and stir for 15 minutes, then transfer to a beaker to cool naturally, and then add 15ml of 30% hydrogen peroxide solution, the solution turns into a bright yellow suspension.

[0030] The above obtained suspension was filtered with qua...

Embodiment 2

[0035] 1. Hummers method prepares graphene oxide solution

[0036] Put 1g of expandable graphite in a three-necked flask, add 100ml of concentrated sulfuric acid into the three-necked flask, and keep the temperature of the mixture below 4°C in an ice-water bath, then slowly add 3g of potassium permanganate, continue stirring in the ice-water bath for 30min, and then Raise the temperature to 30-40°C in a constant temperature water bath, stir for 2.5 hours; slowly add deionized water to the three-necked flask until no bubbles are generated in the reaction system, ensure that the reaction system does not boil during the dropwise addition, and place it in a constant temperature water bath after the dropwise addition Raise the temperature to 90-100°C and stir for 15 minutes, then transfer to a beaker to cool naturally, and then add 15ml of 30% hydrogen peroxide solution, the solution turns into a bright yellow suspension.

[0037] The suspension obtained above was filtered with qua...

Embodiment 3

[0042] 1. Hummers method prepares graphene oxide solution

[0043] Put 1g of expandable graphite in a three-necked flask, add 100ml of concentrated sulfuric acid into the three-necked flask, and keep the temperature of the mixture below 4°C in an ice-water bath, then slowly add 3g of potassium permanganate, continue stirring in the ice-water bath for 30min, and then Raise the temperature to 30-40°C in a constant temperature water bath, stir for 2.5 hours; slowly add deionized water to the three-necked flask until no bubbles are generated in the reaction system, ensure that the reaction system does not boil during the dropwise addition, and place it in a constant temperature water bath after the dropwise addition Raise the temperature to 90-100°C and stir for 15 minutes, then transfer to a beaker to cool naturally, and then add 15ml of 30% hydrogen peroxide solution, the solution turns into a bright yellow suspension.

[0044] The suspension obtained above was filtered with qua...

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Abstract

The invention relates to a layer-by-layer self-assembling oxidized graphene nano-filtration membrane and a preparation method of the layer-by-layer self-assembling oxidized graphene nano-filtration membrane, which belongs to the technical field of the preparation of a nano-filtration membrane. The layer-by-layer self-assembling oxidized graphene nano-filtration membrane comprises a supporting layer and a functional layer, wherein the functional layer is in a layered structure which is different from the compact structure of the traditional nano-filtration membrane functional layer. The preparation method comprises the following steps of (I) preparing an oxidized graphene solution through a hummers method; and (II) preparing an oxidized graphne nano-filtration membrane through a layer-by-layer self-assembling method. The oxidized graphene nano-filtration membrane is prepared through the layer-by-layer self-assembling method, a water passage is formed between the oxidized graphene lamellas, the distance of the oxidized graphene layer has a good interception effect for ions, the hydrophilia can be improved through the oxygen-containing functional groups on the surface of the oxidized graphene layer, so that the membrane is good in permeability and interception property. By utilizing the layer-by-layer self-assembling method, the high requirement of the traditional nano-filtration membrane preparation process on the condition can be avoided, the process is simple, the condition is easily controlled, and the application prospect is wide.

Description

technical field [0001] The invention relates to a layer-by-layer self-assembled graphene oxide nanofiltration membrane and a preparation method thereof, belonging to the technical field of nanofiltration membrane preparation. Background technique [0002] Nanofiltration is a new type of pressure-driven membrane separation technology, which is between reverse osmosis and ultrafiltration. The pore size of nanofiltration membrane is in the nanometer range, generally 0.5-2.0nm. Divalent ions have different rejection rates. The preparation methods of nanofiltration membrane mainly include interfacial polymerization method, phase inversion method, charging method and blending method, etc. Interfacial polymerization method is the most widely used preparation method of nanofiltration membrane. At present, the nanofiltration membrane mainly uses polyamide as the ultra-thin functional layer, and the polyamide nanofiltration membrane is prepared by the interfacial polymerization metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 高学理魏怡王剑王佳立
Owner OCEAN UNIV OF CHINA