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Semipermeable membrane and use thereof

A semi-permeable membrane and nanoporous technology, applied in the field of material science, can solve the problems of semi-permeable membranes that need to be improved, and achieve the effects of high salt rejection rate, stable chemical and electrochemical properties, and improved permeation efficiency

Inactive Publication Date: 2015-05-20
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, current semipermeable membranes still need to be improved

Method used

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  • Semipermeable membrane and use thereof
  • Semipermeable membrane and use thereof
  • Semipermeable membrane and use thereof

Examples

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Embodiment 1

[0034] refer to Figure 4 , prepare a graphene permselective film with a nanoporous structure through the following steps:

[0035] The graphene is etched by UV-induced oxidation to obtain graphene with a nanopore structure, and by controlling the etching time, the size of the pores generated by the etching is controlled. The obtained graphene with a nanopore structure is placed in a reducing or oxidizing environment, so as to chemically modify the edge of the nanopore structure.

[0036] The chemically modified graphene with nanoporous structure is integrated on the porous substrate, which can be mechanically fixed to limit the movement of the graphene film with the fluid and ensure that it is not washed away by the incoming flow.

[0037] Among them, the specific conditions for chemical modification modification are:

[0038] (1). Hydroxyl (-OH) modification: Put the graphene with nanopore structure into the ozone environment, and then mix with NaBH 4 reaction to obtain g...

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Abstract

The invention discloses a semipermeable membrane which is formed from graphene provided with nanopores. The semipermeable membrane provided by the invention has extremely strong mechanical performance (strength: 130GPa), good thermal stability (can bear high temperature of 2300 DEG C) and excellent chemical and electro-chemical stability, and can be effectively used as a selective pervious membrane in permeation.

Description

technical field [0001] The present invention relates to the field of materials science. Specifically, it relates to a semipermeable membrane and its use. Background technique [0002] With the rapid development of human society, human beings are increasingly dependent on water resources, but the current situation of water resources is worrying for the world. 71% of the surface area of ​​the earth we live on is covered with water. However, 97.5% of the water is seawater, which is salty and bitter, and cannot be used for drinking, irrigation, or industrial use. Only the remaining 2.5% is fresh water. In fresh water, nearly 70% is frozen in the Antarctic and Greenland ice sheets, and most of the rest is moisture in the soil or deep groundwater, which is difficult for humans to exploit. Water from sources such as rivers, lakes, reservoirs, and shallow groundwater is easier to exploit for direct human use, but its amount is less than 1% of the world's fresh water, accounting f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/02B01D61/00C02F1/44
Inventor 徐志平宋智功黄贤良金智渊
Owner TSINGHUA UNIV
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