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Design method for high-flux porous membrane

A design method, porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in simultaneous realization

Active Publication Date: 2019-05-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These requirements are difficult to achieve simultaneously in the existing materials (Ho Bum Park, Chul Ho Jung, Young Moo Lee1, Anita J. Hill, Steven J. Pas, Stephen T. Mudie, Elizabeth Van Wagner, Benny D. Freeman, David J .Cookson, Polymers with Cavities Tuned for Fast Selective Transport of Small Molecules and Ions. Science, 2007, 318, 254)

Method used

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  • Design method for high-flux porous membrane
  • Design method for high-flux porous membrane
  • Design method for high-flux porous membrane

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, salt difference energy-electric energy conversion

[0030] Preparation of molybdenum disulfide high-throughput selective membrane: use an ultrasonic cell pulverizer to prepare a molybdenum disulfide dispersion with uniform sheet size, and use vacuum filtration to form a molybdenum disulfide dispersion on a cellulose membrane or a nuclear pore membrane. desired two-dimensional layered films. Due to the negative charges carried by the molybdenum disulfide sheets, during the deposition process, the molybdenum disulfide sheets self-assemble under the action of electrostatic repulsion to form a porous membrane material with a layer spacing of 0.8-1.1nm. After further high-temperature heat treatment, the nuclear pore membrane-molybdenum disulfide composite material is prepared. Afterwards, the sample was embedded with epoxy resin, and the embedded single molybdenum disulfide nanoporous material was processed into a suitable size by slicing, and assembled into a...

Embodiment 2

[0034] Embodiment 2, seawater desalination

[0035] Preparation of graphene oxide high-flux selectivity membrane: the suspension of graphene oxide was evenly spread on the cellulose membrane by spin coating method, and the porous membrane structure of graphene oxide was obtained after heat treatment. The cross-sectional transmission electron microscope photograph of the prepared graphene oxide film is as follows: image 3 shown. Afterwards, the sample is embedded with plexiglass, and the embedded single nanoporous material is processed into a suitable size by slicing, and assembled into a large-area sample. Finally, the required area is obtained by grinding and thinning the surface. and thickness of the sample; the exposed end of the thinned graphene oxide high-flux membrane presents image 3 The lamellar structure in .

[0036] Such as Figure 6 As shown, the graphene oxide porous membrane is packaged into a suction filtration tank, NaCl solutions of different salinities ...

Embodiment 3

[0037] Embodiment 3, the sieving effect of different ions

[0038] Such as Figure 7 As shown, the high-throughput graphene oxide membrane is placed between two solution tanks, and the cross-sectional transmission electron microscope photo of the graphene oxide membrane is shown in image 3 shown. Fill the solution tank on the left with 30mM NaCl and MgCl 2 For the mixed solution, fill the solution tank on the right with pure water. The effective area of ​​the graphene oxide film is 1mm 2 . A transmembrane voltage of 0.01V is applied to the graphene oxide membrane by a voltage source, and a pressure difference of 1 atmosphere is applied across the membrane at the same time. After 2 hours, Mg can be measured in the solution tank on the right 2+ The concentration is 1mM, while Na + The concentration is 0.01mM, indicating that the graphene oxide membrane can realize the screening of different ions under the assistance of electric field.

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Abstract

The invention relates to a design method for a high-flux porous membrane. A porous membrane structure is composed of tubular structures or sheet layer structures, the tubular structures or the sheet layer structures are directionally distributed in the transmembrane direction to form a straight channel which runs through the two ends of the porous membrane, the straight channel provides a fluid transmembrane transportation path and transmembrane flow resistance, and meanwhile the flow resistance is provided for fluid transportation through an atom-level flat interface and high porosity of thetubular structures or the sheet layer structures; the porous membrane is placed in a solution groove, and under the effect of an aqueous solution, the porous membrane is ionized, so that the surface of a pore channel is provided with charges; an ionized nano channel generates a repulsive effect on ions with the same kind of charges, and accordingly the ions are prevented from entering the pore channel; through narrow interlayer spacing, the limit effect on the space size is generated on hydrated ions with a size larger than the interlayer spacing, passage of the ions is limited, and under theeffect of driving force, and when solvent molecules, ions and particles in the aqueous solution reach the other side of the porous membrane from one side of the porous membrane along the through straight channel, fluid transportation is completed through the distance on the limited space.

Description

technical field [0001] The invention relates to a structural design of a high-flux membrane, in particular to a design method of a high-flux porous membrane that mainly adopts a transverse structure penetrating both ends of the membrane, and fluids are transported rapidly across the membrane between layers. Background technique [0002] The need for efficient separations exists in applications ranging from water purification to petroleum refining, chemical production and carbon capture. Membrane structure and materials are the key to membrane technology, and key technological breakthroughs in high-performance membrane structures and materials will directly affect the promotion of membrane technology in practical applications. This has prompted people to vigorously explore new high-performance separation membranes. The core indicators of membrane performance are selectivity and flux, which are key common problems in many chemical processes. They are closely related to the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D71/02B01D71/06
CPCB01D71/02B01D69/02B01D71/06
Inventor 曹留烜李宁李豪张振坤肖飞龙
Owner XIAMEN UNIV
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