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Preparation method of reverse osmosis composite membrane modified with graphene oxide quantum dot-silver phosphate composite

A graphene quantum dot and reverse osmosis composite membrane technology, applied in the field of membrane separation, can solve problems such as shortening membrane life, blocking membrane pores, and membrane being easily polluted, and achieves improved hydrophilicity, high water flux, and efficient sterilization. performance effect

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

AI Technical Summary

Problems solved by technology

Graphene oxide quantum dots are also used to prepare nanofiltration membranes or reverse osmosis membranes. Although a large number of hydrophilic functional groups on the surface can enhance the hydrophilicity of the membrane and improve the membrane flux, the membrane is easily polluted during operation. Microorganisms are easy to deposit and multiply on the surface of the membrane, blocking the membrane pores and shortening the life of the membrane

Method used

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  • Preparation method of reverse osmosis composite membrane modified with graphene oxide quantum dot-silver phosphate composite
  • Preparation method of reverse osmosis composite membrane modified with graphene oxide quantum dot-silver phosphate composite
  • Preparation method of reverse osmosis composite membrane modified with graphene oxide quantum dot-silver phosphate composite

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Effect test

Embodiment 1

[0038] Embodiment 1 Preparation of graphene oxide quantum dot-silver phosphate composite material

[0039] 10 ml of graphene oxide quantum dot (4 mg / ml) suspension was mixed with 12 ml of silver nitrate (10 mM) aqueous solution and stirred magnetically for 30 minutes, then 0.0144 g of disodium hydrogen phosphate dodecahydrate was added to the mixture and vigorously stirred in the dark After 1 hour, the mixture was centrifuged at 8000 rpm, washed three times with deionized water, and vacuum freeze-dried to obtain a graphene oxide quantum dot-silver phosphate composite material.

Embodiment 2

[0041] A preparation method of a reverse osmosis composite membrane modified by a graphene oxide quantum dot-silver phosphate composite material, comprising steps as follows:

[0042] (1) The graphene oxide quantum dot-silver phosphate composite material of embodiment 1 is added into deionized water, and ultrasonically stirred for 1 hour,

[0043](2) Add m-phenylenediamine in step (1), add a certain amount of sodium dodecylsulfonate after stirring evenly, and obtain an aqueous phase solution after ultrasonic dissolution; graphene oxide quantum dot-silver phosphate in the aqueous phase solution The mass concentration of the composite material is 0.001% (w / v), the mass concentration of m-phenylenediamine is 2% (w / v), and the mass concentration of sodium dodecylsulfonate is 0.15w% (w / v).

[0044] (3) A certain amount of trimesoyl chloride is added to n-hexane to make the concentration 0.1w / v%, and the oil phase solution is obtained after ultrasonication;

[0045] (4) Put the wat...

Embodiment 3

[0048] A preparation method of a reverse osmosis composite membrane modified by a graphene oxide quantum dot-silver phosphate composite material, comprising steps as follows:

[0049] (1) The graphene oxide quantum dot-silver phosphate composite material of embodiment 1 is added into deionized water, and ultrasonically stirred for 1 hour,

[0050] (2) Add m-phenylenediamine in step (1), add a certain amount of sodium dodecylsulfonate after stirring evenly, and obtain an aqueous phase solution after ultrasonic dissolution; graphene oxide quantum dot-silver phosphate in the aqueous phase solution The mass concentration of the composite material is 0.002% (w / v), the mass concentration of m-phenylenediamine is 2% (w / v), and the mass concentration of sodium dodecylsulfonate is 0.15w% (w / v).

[0051] (3) A certain amount of trimesoyl chloride is added to n-hexane to make the concentration 0.1w / v%, and the oil phase solution is obtained after ultrasonication;

[0052] (4) Put the wa...

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Abstract

The invention relates to a preparation method of a reverse osmosis composite membrane modified with a graphene oxide quantum dot-silver phosphate composite. According to the method, a composite is dispersed in an aqueous-phase solution of polyamine, polyacyl chloride is dissolved in an organic solvent for preparing an oil-phase solution, a polysulfone membrane is taken as a base membrane, and thereverse osmosis composite membrane modified with the graphene oxide quantum dot-silver phosphate composite is prepared with an interfacial polymerization method by simple and efficient electrostatic drive. The prepared reverse osmosis composite membrane has high water flux, keeps good salt interception level, breaks through limits of upper limit balance, shows excellent sterilization performance and has wide application prospects in the fields of sea water desalination, brackish water treatment and membrane separation.

Description

technical field [0001] The invention relates to a method for preparing a reverse osmosis composite membrane modified by a graphene oxide quantum dot-silver phosphate composite material, and belongs to the technical field of membrane separation. Background technique [0002] With the rapid economic development and rapid population growth, the global water shortage problem is becoming more and more serious. Seawater desalination is considered to be a new way to solve the water crisis and develop freshwater resources. Reverse osmosis membrane separation technology is widely used in seawater desalination and brackish water treatment due to its simple technology, low cost, and good effluent quality. Although reverse osmosis membrane has become the mainstream of membrane separation technology, in practical application, the membrane has the problem of "upper limit balance" between water flux and rejection rate, which seriously restricts the development of reverse osmosis membrane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/34B01D71/26B01D69/12B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D69/12B01D71/26B01D71/34B01D71/68B01D2325/36B01D2325/48
Inventor 高宝玉李书雅王志宁岳钦艳
Owner SHANDONG UNIV
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