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Composite positive osmosis membrane and preparation method thereof

A forward osmosis membrane and graphene composite technology, applied in the field of composite forward osmosis membrane and its preparation, can solve the problems of unreachable, low forward osmosis membrane flux, etc.

Active Publication Date: 2018-01-09
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the forward osmosis membrane obtained by this method is stronger than that of the commercial membrane CTA membrane, the thickness of the dense layer is still as high as 1-2 microns, which makes the flux of the forward osmosis membrane lower. mol L -1 When NaCl salt solution is used as the extraction solution, its water flux is only 7LMH, which still cannot meet the requirements of practical application

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 1g of isopropylacrylamide monomer and 1g of N,N-methylene bisacrylamide monomer in 20g of water, add 0.2g of sodium persulfate as an initiator; then add 0.1g of flake graphene to obtain the final precursor solution. And coating the nylon membrane with micron pores by spin coating, then heating at 70oC for two hours, and repeating the two steps of coating and heat treatment three times to obtain the final forward osmosis membrane.

[0027] figure 2 It is the scanning electron microscope (SEM) figure of the surface and the cross-section of the made forward osmosis membrane, a) the intercepting layer surface, b) the composite membrane cross-section; from which we can see that the surface of the membrane is uniform and dense, no leaks are seen, It can be seen from the cross-sectional view of the membrane that the thickness of the selective layer of the membrane is very thin, about 100 nanometers.

[0028] The test results of the water flux and salt rejection rat...

Embodiment 2

[0030] A film was prepared in a method similar to that of Example 1, except that the mass of graphene flakes was changed to 1.4 g, and a film with a similar structure was obtained.

[0031] The test results of the water flux and salt rejection rate of the membrane show that when using 1mol L -1 The NaCl solution is used as the extraction solution, the water flux of the membrane is 23.0LMH, and its reverse salt flux is 1.2g m -2 h -1 .

Embodiment 3

[0033] Adopt the method similar to embodiment 1 to make film, just change the quality of flake graphene into 0.05g, obtain the film with similar structure.

[0034] The test results of the water flux and salt rejection rate of the membrane show that when using 1mol L -1 The NaCl solution is used as the extraction solution, the water flux of the membrane is 25.9LMH, and its reverse salt flux is 1.5g m -2 h -1 .

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Abstract

The present invention discloses a composite positive osmosis membrane and a preparation method thereof, wherein the positive osmosis membrane is formed by compounding a polymer and graphene compositelayer and a highly porous substrate lower layer, the polymer is a copolymer formed by carrying out free radical polymerization on an isopropyl acrylamide monomer and a N,N-methylene diacrylamide monomer, the highly porous substrate is a porous aromatic polymer film, a mass ratio of the two monomers is 1:9-9:1, and the mass of the graphene is 2.5-70% of the mass of the copolymer. The preparation method comprises precursor solution preparation, film coating, heat treatment, and other steps. The positive osmosis membrane of the present invention has high water flux and high salt rejection rate.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a composite forward osmosis membrane and a preparation method thereof. Background technique [0002] Forward osmosis is a concentration-driven membrane technology, which refers to the transfer process of water from a high water chemical potential area to a low water chemical potential area through a selectively permeable membrane. It has the advantages of high recovery rate, less concentrated water discharge, low membrane fouling, and no external pressure, so forward osmosis technology has attracted more and more attention. In the process of commercialization of forward osmosis water treatment system, lack of suitable forward osmosis membrane is the most important technical obstacle restricting its large-scale development. [0003] The Netherlands "Journal of Membrane Science" (Journal of Membrane Science 360 ​​(2010) 522–535) reported a method for preparing a forward osmosis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/40B01D71/02B01D69/12B01D69/02B01D67/00
Inventor 王焕庭金晟柱乔治·西蒙
Owner BAOSHAN IRON & STEEL CO LTD
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