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Graphene oxide modified high-performance forward osmosis composite membrane and preparation method

A graphene modification, composite membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membranes, etc., can solve the problems of low anti-pollution performance, poor desalination effect, low flux, etc., and achieve strong resistance to biological pollution. Performance, structural stability, high membrane flux effect

Inactive Publication Date: 2017-09-19
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to prepare a high-performance forward osmosis composite membrane and provide its preparation method for the problems of low flux, poor desalination effect, and low anti-pollution performance of the existing forward osmosis membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, N,N-dimethylformamide, polyethylene glycol 600, and Tween 80 were added to a three-necked flask at the ratio of 70wt%, 13.3wt%, and 1wt%, respectively, and then 0.2wt% of a single-layer ultrapure Graphene oxide was added to the solution, and the graphene oxide was fully and uniformly dispersed in the solution by ultrasonication for 30 minutes. After the ultrasonication was over, the solution was moved to a magnetic stirrer, and polysulfone material was added after stirring for 5 minutes, and stirred and dissolved at a temperature of 70°C. 8h to obtain a uniform graphene oxide / polysulfone casting solution; then, the casting solution was left at the reaction temperature for 5h to remove the air bubbles in the casting solution; finally, a certain amount of casting solution was poured into a Use a scraper with a thickness of 50 μm to form a film on a glass plate with 100 polyester screens, immerse in ultrapure water to solidify to form a film, and after the film is au...

Embodiment 2

[0023] Based on the modification method in Example 1, the only difference is that graphene oxide is not added during the preparation of the support layer to obtain a polysulfone polyamide forward osmosis composite membrane (TFC membrane). Similarly, the prepared forward osmosis membrane was tested. In the test time of 1h, the average water flux of the membrane was 5.9LMH, and the reverse salt flux was 8gMH; In the pollution experiment, the water flux decreased by 25% due to biofouling.

[0024] Example 1-2 The detailed comparison of the test data of the forward osmosis composite membrane modified by graphene oxide and the forward osmosis composite membrane without graphene oxide is shown in Table 1.

[0025] Table 1

[0026] Classification of membranes

[0027] It can be seen from the table that the water flux of the forward osmosis composite membrane modified by graphene oxide is greatly increased, and the reverse salt flux is reduced; while the contact angle is re...

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Abstract

The invention discloses a graphene oxide modified high-performance forward osmosis composite membrane and a preparation method and belongs to the technical field of water treatment. The method comprises the steps as follows: firstly, polysulfone, graphene oxide, polyethylene glycol-600, Tween-80 and a solvent are added to a flask through blending, a membrane casting solution is prepared, and a graphene oxide / polysulfone support layer is prepared with a phase conversion method; a polyamide active layer is composited on the surface of the support layer in an interface polymerization manner, and a graphene oxide / polyamide forward osmosis composite membrane is obtained. The prepared graphene oxide modified high-performance forward osmosis composite has the advantages of high flux, low reverse salt flux and high pollution resistance and has the water flux up to 9-12 LMH and the reverse salt flux of 2-4 gMH, and in a pollution resistance test, the flux decrease amplitude caused by pollution is only 30%-50% of that of an unmodified membrane.

Description

technical field [0001] The invention relates to a high-performance forward osmosis composite membrane modified by graphene oxide and a preparation method thereof, in particular to a preparation method of a high-performance forward osmosis composite membrane. Background technique [0002] my country is a country that is extremely scarce in water resources, and the per capita water resources are only a quarter of the world's average level. The increasing population and the rapid development of industry make the problem of water shortage increasingly serious. The development of water treatment technology provides a direction for people to solve the problem of water shortage. As a new separation technology with high efficiency, environmental protection and energy saving, membrane separation technology occupies an important position in water treatment technology. It mainly includes microfiltration, ultrafiltration, nanofiltration, reverse osmosis, forward osmosis, etc. Among t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D65/10B01D67/00B01D69/12
CPCB01D61/002B01D65/10B01D67/0011B01D67/0013B01D67/0016B01D67/0088B01D69/12B01D69/125B01D2325/02B01D2325/36B01D2325/48
Inventor 杨禹李媛李航雨侯立安
Owner BEIJING NORMAL UNIVERSITY
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