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Compound desalination membrane as well as preparation method and application thereof

A desalination membrane and microporous filtration membrane technology, applied in the field of composite desalination membrane and its preparation, can solve the problems of staying, not involving the industrial application of reduced graphene oxide and titanium oxide composite thin film, etc., to prevent transmembrane permeation, excellent Water desalination performance, area and thickness controllable effect

Active Publication Date: 2015-05-13
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, relevant literature [Reference 8] has reported the preparation and related characteristics of the composite film composed of graphene oxide and titanium oxide nanosheets, but it only stays at the stage of basic property research, and none of them involve the reduction of graphene oxide and titanium oxide nanosheets. Practical industrial application of titanium oxide composite film in the field of water desalination

Method used

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  • Compound desalination membrane as well as preparation method and application thereof
  • Compound desalination membrane as well as preparation method and application thereof
  • Compound desalination membrane as well as preparation method and application thereof

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preparation example Construction

[0023] A method for preparing a composite desalination membrane provided by the present invention specifically comprises the following steps:

[0024] 1) Uniformly mix the aqueous solution containing graphene oxide flakes with the aqueous solution of titanium oxide nanosheets; the volume mass concentration of the graphene oxide aqueous solution is 0.5-40 mg / L, the volume mass concentration of the titanium oxide nano-sheet aqueous solution is 0.4-32 mg / L, and the oxidation In the mixed solution of graphene and titanium oxide nanosheets, the mass ratio of graphene oxide to titanium oxide nanosheets is 1:0.25-4;

[0025] 2) With the microporous membrane as the substrate, vacuum filtration is used to dehydrate the mixed solution of graphene oxide and titanium oxide nanosheets under negative pressure, and then stack and self-assemble into a layered film on the microporous membrane substrate 3 , dry at 40-80°C for 4-24 hours;

[0026] 3) By irradiating ultraviolet light for 1 to 5 ...

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] 1) uniformly mix the aqueous solution comprising graphene oxide flakes with the aqueous solution of titanium oxide nanosheets; the volume mass concentration of graphene oxide aqueous solution is 40mg / L, the volume mass concentration of titanium oxide nanosheet aqueous solution is 32mg / L, graphene oxide and oxide In the mixed solution of titanium nanosheets, the mass ratio of graphene oxide to titanium oxide nanosheets is 1:0.8;

[0034] 2) Using a mixed cellulose microporous membrane with a pore size of 220nm as the substrate, the mixed solution of graphene oxide and titanium oxide nanosheets is dehydrated under negative pressure by vacuum filtration, and then stacked on the microporous membrane substrate Self-assembled into a layered film, dried at 55°C for 24 hours;

[0035] 3) After 3 days of ultraviolet light irradiation, the photocatalytic properties of titanium oxide nanosheets are used to uniformly transform...

Embodiment 2

[0039] This embodiment includes the following steps:

[0040] 1) uniformly mix the aqueous solution comprising graphene oxide flakes with the aqueous solution of titanium oxide nanosheets; the volume mass concentration of graphene oxide aqueous solution is 40 mg / L, the volume mass concentration of titanium oxide nanosheet aqueous solution is 10 mg / L, graphene oxide and oxide In the mixed solution of titanium nanosheets, the mass ratio of graphene oxide to titanium oxide nanosheets is 1:0.25;

[0041] 2) Based on the anodized alumina microporous filter membrane with a pore size of 100nm, the mixed solution of graphene oxide and titanium oxide nanosheets is dehydrated under negative pressure by vacuum filtration, and then stacked on the microporous membrane substrate Self-assembled into a layered film, dried at 40°C for 24 hours;

[0042] 3) By irradiating with ultraviolet light for 1 day, the photocatalytic properties of titanium oxide nanosheets are used to uniformly transfor...

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Abstract

The invention discloses a compound desalination membrane as well as a preparation method and an application thereof. The compound desalination membrane comprises a microporous filter membrane substrate layer and a functional layer, wherein the functional layer comprises reduced graphene oxide sheets and titanium oxide nanosheets, which are uniformly mixed and mutually stacked to form a laminar membrane. The preparation method comprises the following steps: uniformly mixing a water solution containing the graphene oxide sheets with a water solution containing the titanium oxide nanosheets; taking a microporous filter membrane as a substrate, preparing the laminar graphene oxide and titanium oxide compound membrane on the microporous filter membrane substrate by adopting a vacuum suction filtration method, and drying; uniformly converting graphene oxide into reduced graphene oxide through ultraviolet radiation to finally obtain the compound desalination membrane. The method realizes composition and structural design of the compound desalination membrane formed on the microporous filter membrane substrate based on reduced graphene oxide and the titanium oxide nanosheets; the prepared compound desalination membrane is soft, uniform, controllable in area and thickness, high in mechanical strength and high in desalination performance, and is used in the field of water desalination.

Description

technical field [0001] The invention relates to the application field of nano environmental materials, in particular to a composite desalination membrane with high desalination performance and high water permeability, its preparation method and application. Background technique [0002] With the severe shortage and pollution of clean fresh water resources in the world, water desalination technology is particularly important. Currently widely used water desalination technologies mainly include thermal multi-stage flash evaporation, thermal multiple-effect distillation, electrodialysis and membrane reverse osmosis technology. Among them, membrane reverse osmosis technology has attracted extensive attention due to its low energy consumption and will be widely used in the future. Applications. At present, organic polyamine membranes are widely used in thin film reverse osmosis technology because of their advantages of flexibility, low price and simple preparation. At the same ...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/36B01D71/02B01D71/10B01D69/12B01D67/00C02F1/44
CPCY02A20/131
Inventor 朱宏伟孙鹏展王昆林
Owner TSINGHUA UNIV
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