Nanometer composite filtering membrane for salt and water separation as well as preparation method and application thereof

A nanocomposite and filter membrane technology, applied in the field of membrane separation, can solve the problems of destroying the structural integrity of polyamide, and achieve the effects of improving energy utilization, reducing process costs, and resisting erosion

Inactive Publication Date: 2018-06-19
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polyamide membrane filters need to be cleaned frequently, the chlorine contained in the cleaning agent will destroy the structural integrity of polyamide, which will lead to a series of equipment maintenance and renewal problems

Method used

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  • Nanometer composite filtering membrane for salt and water separation as well as preparation method and application thereof
  • Nanometer composite filtering membrane for salt and water separation as well as preparation method and application thereof
  • Nanometer composite filtering membrane for salt and water separation as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The nanocomposite filter membrane of the present invention is prepared by the following steps:

[0050] S1. Setting an alumina nano-ceramic membrane, the nano-ceramic membrane has a pore diameter of about 1 nm and a thickness of 0.4 μm.

[0051] S2. Prepare a graphene solution, and form a graphene coating on the alumina nano-ceramic film by a spin coating method:

[0052] Dispersing graphene in water, ultrasonic processing, and centrifugal separation to obtain the graphene solution;

[0053] It is further used after filtration through a polycarbonate membrane. The pore size of the polycarbonate membrane is 400 nm;

[0054] The graphene solution is spin-coated on the alumina nano-ceramic film at a rotation speed of 500 r / min, 1000 r / min, 1500 r / min or 2000 r / min; the spin coating time is 20 seconds.

[0055] S3. The alumina nano-ceramic membrane provided with the graphene coating is calcined under vacuum to obtain the nano-composite filter membrane; the temperature of the vacuum c...

Embodiment 2

[0059] The nanocomposite filter membrane of Example 1 is used for the separation of seawater, and the water is passed through by suction filtration, while the salt is left behind. After testing, the water separation rate is as high as 90%.

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Abstract

The invention discloses a nanometer composite filtering membrane for salt and water separation as well as a preparation method and application thereof. The nanometer composite filtering membrane comprises an aluminum oxide nanometer ceramic membrane as well as a graphene layer arranged on the surface of at least one side of the aluminum oxide nanometer ceramic membrane; and the pore diameter of the nanometer composite filtering membrane is less than 0.6 nm. The nanometer composite filtering membrane provided by the invention has good salt and water separation effect, large flux and high rejection rate, does not block the membrane pores, can effectively intercept salt molecules, and is pollution-resistant and easy to clean. Furthermore, the preparation method is simple in operation, convenient and practical.

Description

Technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a nanocomposite filter membrane used for brine separation, and a preparation method and application thereof. Background technique [0002] There is a serious shortage of fresh water resources in my country, especially in the northern regions of China, such as Tianjin, Beijing, Hebei, Shandong, Henan, Liaoning, Shaanxi, and Gansu. It is necessary to vigorously promote the utilization of recycled water, mine water, seawater desalination and brackish water. Therefore, the use of desalination as an open source incremental technology for water resources has become a very urgent task. Compared with the South-to-North Water Diversion, desalination has more practical value for the coastal areas of northern my country. Under the background of my country's national policies and plans, my country's desalination market will face huge opportunities in the future. [0003] S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/02B01D67/00B01D61/00C02F1/44C02F103/08
CPCB01D69/12B01D61/00B01D67/0088B01D69/02B01D71/021B01D71/025B01D2325/12B01D2325/30C02F1/44C02F2103/08
Inventor 童海霞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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