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Subnanometer porous graphene permeable membrane and its preparation method and application

A porous graphene and sub-nanometer technology, applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., can solve problems such as difficult to control size distribution

Active Publication Date: 2021-04-23
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical etching methods can produce stable nanopores with functional groups depending on the type of etchant such as oxygen, hydrogen, and oxidized etchant, however, it is difficult to control the size distribution of these nanopores

Method used

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  • Subnanometer porous graphene permeable membrane and its preparation method and application
  • Subnanometer porous graphene permeable membrane and its preparation method and application
  • Subnanometer porous graphene permeable membrane and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1. Select a polyester film of 1cm x 1cm and a thickness of 0.5mm as the substrate, use deionized water to ultrasonically clean the polyester film substrate for 1min, and dry it with nitrogen to obtain the polyester film substrate for use;

[0031] 2. Use gallium as the ion source to carry out focused ion beam bombardment on the polyester film substrate, and set the working parameters as follows: select a 15 μm aperture, set the ion beam bombardment area as a circle, the diameter of the circle is 2 μm, and set the nanopore The array period is 2.5μm, the beam current is set to 0.4pA, and the dose of the focused ion beam is set to 0.07nC / μm 2 , forming a high-density nanohole array with a diameter of 2 μm on a polyester film substrate, and preparing a polyester film with a high-density nanohole array to support single-layer graphene;

[0032] 3. Transfer single-layer graphene to a polyester film with a high-density nanopore array to obtain a polyester film-based single-lay...

Embodiment 2

[0036] 1. Select a polyester film with a size of 1cm x 1cm and a thickness of 1mm as a substrate, use deionized water to ultrasonically clean the polyester film substrate for 5 minutes, and dry it with nitrogen to obtain a polyester film substrate for use;

[0037] 2. Use gallium as the ion source to carry out focused ion beam bombardment on the polyester film substrate, set the working parameters as follows: select a 15 μm aperture, set the ion beam bombardment area as a circle, the diameter of the circle is 1 μm, and set the nanopore The array period is 1.5μm, the beam current is set to 0.1pA, and the dose of the focused ion beam is set to 0.02nC / μm 2 , forming a high-density nanohole array with a diameter of 1 μm on a polyester film substrate, and preparing a polyester film with a high-density nanohole array to support single-layer graphene;

[0038] 3. Transfer single-layer graphene to a polyester film with a high-density nanopore array to obtain a polyester film-based sin...

Embodiment 3

[0042] 1. Select a 1cm x 1cm polyester film with a thickness of 0.5mm as the substrate, use deionized water to ultrasonically clean the polyester film substrate for 10 minutes, and dry it with nitrogen to obtain the polyester film substrate for use;

[0043] 2. Use gallium as the ion source to carry out focused ion beam bombardment on the polyester film substrate, and set the working parameters as follows: select a 15 μm aperture, set the ion beam bombardment area as a circle, the diameter of the circle is 2 μm, and set the nanopore The array period is 2.5μm, the beam current is set to 0.45pA, and the dose of the focused ion beam is set to 0.1nC / μm 2 , forming a high-density nanohole array with a diameter of 2 μm on a polyester film substrate, and preparing a polyester film with a high-density nanohole array to support single-layer graphene;

[0044] 3. Transfer single-layer graphene to a polyester film with a high-density nanopore array to obtain a polyester film-based single...

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Abstract

The invention discloses a subnano porous graphene permeable membrane and its preparation method and application. The subnano porous graphene permeable membrane of the present invention can selectively filter water molecules, potassium ions, sodium ions and chloride ions in seawater , so as to be applied to the desalination treatment of seawater, which is mainly realized by a porous array with a pore diameter of 0.35-0.65nm on the graphene permeable membrane. The present invention also provides a preparation method for a sub-nano porous graphene permeable membrane. The focused ion beam of the gallium ion source is used to bombard the polyester film substrate in sequence, the single-layer graphene is transferred to the polyester film substrate, and the helium ion source is used to The focused ion beam bombards graphene to form high-density regular array defects, and uses plasma etching to form sub-nanometer porous graphene permeable membranes, so that water molecules can pass through and K + 、Na + and Cl ‑ The purpose of desalination of seawater cannot be achieved by passing through.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a subnano porous graphene permeable membrane and a preparation method and application thereof. Background technique [0002] In recent years, top-down methods such as bottom-up chemical synthesis of sub-nanoporous graphene films and electron beam exposure, ion irradiation (ion bombardment, ion beam etching), chemical etching, plasma etching, etc. Subnanometer pores were prepared on pristine graphene films and applied in the field of seawater desalination. Ion irradiation can produce high-density defects with controllable density and defect type through the control of the incident angle, energy, type and flux of the ion beam, and the knock-out or lattice rearrangement of individual carbon atoms causes most of these defects to be unstable. of. The chemical etching method can generate stable nanopores with functional groups depending on the type of etchant such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00C02F1/44C02F103/08
CPCB01D67/0062B01D71/021C02F1/44C02F2103/08Y02A20/131
Inventor 王德强何石轩谢婉谊方绍熙周大明
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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