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A kind of composite cellulose acetate forward osmosis membrane and its preparation method and application

A technology of cellulose acetate and forward osmosis membrane, applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., to achieve high retention, increase water flux, and reduce membrane fouling

Active Publication Date: 2020-10-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation method of forward osmosis membrane still adopts the traditional technology of preparing pressure-driven membrane in the past, and the preparation method of new high-performance forward osmosis membrane still has some shortcomings to a certain extent, and its development is still in its infancy.

Method used

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Examples

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preparation example Construction

[0021] As an aspect of the technical solution of the present invention, what it relates to is a preparation method of a composite cellulose acetate forward osmosis membrane, which includes:

[0022] (1) at least cellulose acetate, dioxane, acetone, methanol and lactic acid are mixed uniformly and heated to form a casting solution, and then a flat film is made by a phase inversion method;

[0023] (2) Put the flat film into the polyvinyl alcohol solution, then take it out and put it into the crosslinking solution to carry out the crosslinking reaction;

[0024] (3) Put the flat membrane treated in step (2) into a liquid phase system containing a substance capable of promoting the polymerization of dopamine, and then add dopamine to carry out polymerization reaction to obtain a composite cellulose acetate forward osmosis membrane.

[0025] In some embodiments, the temperature of the crosslinking reaction is 40-65° C., and the time is 5-30 minutes.

[0026] Preferably, the conte...

Embodiment 1

[0050] (1) Add 10 parts by weight of cellulose acetate, 54 parts of dioxane, 15 parts of acetone, 8 parts of methanol, and 7 parts of lactic acid into a three-necked bottle and heat at 50°C for 6 hours. After sealing, stirring, After degassing, it is prepared into a casting liquid, and then a flat film is made by a phase inversion method;

[0051] (2) Immerse the prepared flat diaphragm in a solution containing 2 parts by weight of polyvinyl alcohol and 2 parts by weight of ethanol for 1 hour, take it out and put it in 1 part by weight of glutaraldehyde aqueous solution at 40°C Let it react for 10 minutes, take it out and let it dry;

[0052] (3) Immerse the dried flat diaphragm into a Tris buffer solution containing 5 parts by mass fraction of hydrogen peroxide and 1 part by mass fraction of activated carbon with a pH value of 8.5 and stir evenly, then add 2 parts by mass fraction of dopamine and react at room temperature After 5 minutes, the reacted flat membrane was washed 3...

Embodiment 2

[0055] (1) Add 11 parts by weight of cellulose acetate, 60 parts of dioxane, 12 parts of acetone, 9 parts of methanol, and 6 parts of lactic acid into a three-necked bottle and heat at 50°C for 6 hours. After sealing, stirring, After degassing, it is prepared into a casting liquid, and then a flat film is made by a phase inversion method;

[0056] (2) Immerse the prepared flat diaphragm in a solution containing 3 parts by mass fraction of polyvinyl alcohol and 3 parts by mass fraction of ethanol for 1 hour, take it out and place it in 2 parts by weight of glutaraldehyde aqueous solution at 50°C Let it react for 30 minutes, take it out and let it dry;

[0057] (3) Immerse the dried flat diaphragm into a Tris buffer solution containing 2 parts of hydrogen peroxide and 1.5 parts of ferric chloride with a mass fraction of 8.5 and stir evenly, add 1 part of dopamine at room temperature After reacting for 8 minutes, the reacted flat membrane was washed 3 times with distilled water ...

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Abstract

The invention discloses a composite cellulose acetate forward osmosis membrane and a preparation method and application thereof. The preparation methods comprises the steps: cellulose acetate, dioxane, acetone, methanol and lactic acid are at least evenly mixed and heated to form membrane casting fluid, and then the membrane casting fluid is made into a flat membrane through a phase conversion method; the flat membrane is placed into a polyvinyl alcohol solution, and then taken out to be placed into a crosslinking solution to be subjected to crosslinking reacting; and the flat membrane treatedby the steps is placed in a liquid phase system containing substances capable of promoting dopamine polymerization, then dopamine is added for a polymerization reaction, and the composite cellulose acetate forward osmosis membrane is obtained. The composite cellulose acetate forward osmosis membrane prepared by the method has the characteristics of high flux, high retention, environmental friendliness and the like, and can be widely applied to the fields such as seawater desalination, wastewater treatment, and emergency water bag or strong brine recondensation.

Description

technical field [0001] The invention belongs to the technical field of forward osmosis water treatment membranes, in particular to a composite cellulose acetate forward osmosis membrane and its preparation method and application. Background technique [0002] At present, with the continuous growth of population and economy, environmental pollution, resource and energy shortages are becoming more and more prominent, and the shortage of water resources is particularly serious. Therefore, water treatment technology has attracted more and more attention from the government and enterprises. Compared with traditional water treatment methods, membrane water treatment has many advantages such as low energy consumption, simple process, stable operation and high effluent quality, and has been popularized and applied in many fields. However, the pressure-driven membrane process requires a large area, high external pressure, easy contamination of the membrane, and the problem of concen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D67/00B01D69/12B01D71/16B01D71/60C02F1/44C02F103/08
CPCB01D61/002B01D67/0011B01D67/0013B01D69/125B01D71/16B01D71/60B01D2325/023C02F1/445C02F2103/08Y02A20/131
Inventor 宋海明王立平朱丽静曾志翔薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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