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Reverse osmosis membrane and method of use

A reverse osmosis, two-dimensional nanotechnology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of controlling the interlayer distance and reducing the thickness of the selective layer.

Active Publication Date: 2019-08-02
MONASH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, problems arise in controlling the interlayer distance and reducing the thickness of the selective layer in practical industrial applications using GO / reduced GO membranes

Method used

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  • Reverse osmosis membrane and method of use
  • Reverse osmosis membrane and method of use
  • Reverse osmosis membrane and method of use

Examples

Experimental program
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Effect test

Embodiment 1

[0086] Embodiment 1: manufacture GO-poly(NIPAM-MBA) membrane on commercial ultrafiltration membrane carrier

[0087] Fabrication of GO-polymer film: GO was synthesized from graphite powder by a modified Hummers method. The resulting GO suspension had a concentration of 3.8 mg / ml in water. GO concentration was determined by freeze-drying 10 ml of GO suspension and weighing the residual solid (GO). Monomers used to fabricate polymer networks within GO laminate scaffolds included N-isopropylacrylamide (NIPAM), N,N'-methylenebisacrylamide (MBA), and ammonium persulfate were purchased from Missouri Sigma-Aldrich (St Louis, MO) and used without further purification. Specifically, 38 mg NIPAM, 38 mg MBA and 7 mg ammonium persulfate were dissolved in 10 ml GO suspension. To change the ratio of GO / poly(NIPAM-MBA) from 4.5% to 50% (according to Table 1), the same amount of NIPAM, MBA and ammonium persulfate was added to 10ml with different GO loadings 3.4mg, 4.8 mg, 9.5mg, 19mg, 28....

Embodiment 2

[0100] Example 2: Fabrication of GO Laminate-Poly(NIPAM-MBA)

[0101] The following illustrates how the process of radical polymerization of GO suspensions under aqueous conditions enables the formation of GO-polymer networks without covalent bonding between GO and polymers, resulting in mechanical robustness, remarkable water transport properties and suitable Combination of resistance to swelling tendencies required for high pressure operation in reverse osmosis (RO) membrane processes.

[0102] The GO-polymer membrane prepared according to the present invention does not swell during RO operation and remains stable under harsh oxidative environments. A water flux of 33.5 L m at 10 bar was also shown when prepared by high vacuum filtration and subsequent polymerization of the precursor solution onto a mesoporous substrate. -2 h -1 , The desalination rate is 98.5%. This approach demonstrates that massively scalable membrane fabrication is feasible.

[0103] Fabrication of G...

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Abstract

The invention relates to a membrane, and method of manufacture of a membrane for reverse osmosis having (i) a porous substrate, and (ii) a layer adjacent the porous substrate comprising a two dimensional nanosheet material and crosslinked polymer. The two dimensional nanosheet material is preferably chosen from the group comprising graphene oxide including reduced graphene oxide, holey graphene, holey graphene oxide, laminated graphene oxide and holey reduced graphene oxide.

Description

technical field [0001] The present invention relates to the field of membrane technology. [0002] In one form, the invention relates to a graphene-based membrane and a method of making the same. In a particularly preferred form, the invention relates to a film comprising two-dimensional nanosheet materials, such as graphene oxide (GO) and polymer films. [0003] In a particular aspect, the invention is suitable for use as a membrane for desalination and water purification. [0004] In the following it will be convenient to describe the invention in relation to seawater desalination, however, it should be understood that the invention is not limited to this use and that other applications will be apparent to those skilled in the art. Background technique [0005] It should be understood that any discussion of documents, means, acts or knowledge is included in this specification to explain the context of the invention. In addition, the discussion throughout this specificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D61/08
CPCB01D61/025B01D69/125B01D71/68B01D2323/30Y02A20/131B01D67/00046B01D71/0211B01D67/00793B01D71/401B01D69/1213C02F1/441C02F2103/08
Inventor 王焕庭金昇柱
Owner MONASH UNIV