Preparation method of anti-pollution type reverse osmosis membrane doped with cerium oxide and silver nano-particles

A silver nanoparticle, reverse osmosis membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, osmotic/dialysis water/sewage treatment, etc. , water flux reduction and other problems, to achieve the effect of improving surface hydrophilicity, excellent anti-fouling performance, and increasing water flux

Inactive Publication Date: 2019-03-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if silver particles are loaded on the reverse osmosis membrane, it is easy to block the osmotic membrane, resulting in a greatly reduced water flux, so sterilization and high water flux cannot be achieved at the same time

Method used

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  • Preparation method of anti-pollution type reverse osmosis membrane doped with cerium oxide and silver nano-particles
  • Preparation method of anti-pollution type reverse osmosis membrane doped with cerium oxide and silver nano-particles
  • Preparation method of anti-pollution type reverse osmosis membrane doped with cerium oxide and silver nano-particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing a reverse osmosis membrane doped with cerium oxide and silver nanoparticles, comprising steps as follows:

[0043] (1) Preparation of silver-modified cerium oxide composite material: 0.1 g of pure cerium oxide nanoparticles was dispersed in 100 mL of deionized water, and ultrasonically treated for 10 min. Add 0.017 g of silver nitrate to the cerium oxide solution, stir magnetically for 10 min, add sodium citrate solution with a concentration of 0.006 g / mL, and stir magnetically again for 20 min. Then add 0.02g of NaBH 4 As a reducing agent, silver ions were converted into metallic silver nanoparticles, and stirred at room temperature for 12 hours. At this point, the surface of cerium oxide particles was decorated with silver nanoparticles, and the color changed from light yellow to gray. Centrifuge at 9000rpm for 10min, wash the obtained product several times with deionized water, dry the product at 80°C for 1h, and finally calcinate in air at 30...

Embodiment 2

[0049] The difference in the preparation method of the anti-fouling type doped cerium oxide and silver nanoparticle reverse osmosis membrane as described in Example 1 is:

[0050] Step (3) The concentration of the silver-modified cerium oxide composite material in the silver-modified cerium oxide composite material aqueous solution is 0.05g / L,

[0051] Step (5) heat-treat the interfacially polymerized film in an oven at 60° C. for 6 minutes.

Embodiment 3

[0053] The preparation method of the cerium oxide nanoparticle-doped reverse osmosis composite membrane as described in Example 1, the difference is:

[0054] Step (3) The concentration of the silver-modified cerium oxide composite material in the silver-modified cerium oxide composite material aqueous solution is 0.15g / L,

[0055] Step (5) Put the interfacially polymerized film into an oven at 90° C. for heat treatment for 4 minutes.

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Abstract

The invention relates to a preparation method of an anti-pollution type reverse osmosis membrane doped with cerium oxide and silver nano-particles. The preparation method comprises the following steps: adding water in a silver-modified cerium oxide composite material to prepare a silver-modified cerium oxide composite material aqueous solution, adding polyamine and a surfactant and uniformly stirring to obtain an aqueous phase solution; pouring the aqueous phase solution on a basement membrane, keeping for 30-180 seconds, then removing the residual aqueous phase solution, naturally airing, then pouring in an oil phase solution and removing the residual oil phase solution after reaction to obtain the anti-pollution type reverse osmosis membrane added with the cerium oxide and silver nano-particles. The anti-pollution type reverse osmosis membrane added with the cerium oxide and silver nano-particles, prepared by the preparation method provided by the invention, has high water flux and strong bactericidal performance, reduces bacterial growth and reproduction on the surface of a filter membrane, prolongs the service life of an ultra-filtration membrane and is lasting and stable in filtering effect, long in membrane life and simple in preparation method.

Description

technical field [0001] The invention relates to a method for preparing an anti-pollution type reverse osmosis membrane doped with cerium oxide and silver nanoparticles, and belongs to the technical field of membrane preparation. Background technique [0002] The shortage of water resources in my country is very serious. Due to its low energy consumption, high desalination rate and high water production rate, reverse osmosis technology is widely used in seawater desalination, brackish water desalination, sewage treatment and other fields. Polyamide is currently the most widely used membrane material in the field of reverse osmosis technology. The traditional polyamide thin film composite membrane (thin film composite, TFC) is prepared by interfacial polymerization, which can effectively separate water molecules and salt ions, and has a stable structure. , Excellent separation performance and so on. However, in the application process of traditional reverse osmosis membranes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/64B01D71/26B01D69/12B01D67/00C02F1/44C02F103/08
CPCB01D67/0079B01D69/12B01D71/26B01D71/64B01D71/68B01D2325/26B01D2325/48C02F1/441C02F2103/08
Inventor 高宝玉汪洋王志宁岳钦艳
Owner SHANDONG UNIV
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