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Composite membrane and preparing method and application thereof

A composite membrane and carbon composite technology, which is applied in the field of ion separation, can solve the problems of poor chemical resistance, short life, and limit the development of thin-film reverse osmosis technology, and achieve the goal of increasing the range of absorption wavelengths, improving utilization efficiency, and high mechanical properties. Effect

Inactive Publication Date: 2016-12-14
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, at present, organic polyamine membranes are widely used in membrane reverse osmosis technology, which has poor chemical resistance and short life, which limits the development of membrane reverse osmosis technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of composite film

[0026] 1) uniformly mix the aqueous solution of graphene oxide, the aqueous solution of ZnS and the aqueous solution of nano titanium oxide; The volume concentration is 5mg / L; the mass ratio of graphene oxide and nano-titanium oxide is 1:0.15, and the mass ratio of ZnS and nano-titanium oxide is 1:0.6;

[0027] 2) Based on the PP microporous filter membrane with an average pore size of 2.1 microns, the mixture solution of graphene oxide, ZnS and nano-titanium oxide is dehydrated under negative pressure by vacuum filtration method, and then interacted on the microporous filter membrane substrate. Stacking self-assembly into a carbon-containing composite layer; during the suction filtration process, another layer of PP microporous filter membrane with an average pore size of 8.6 microns is coated on the carbon-containing composite layer to form a composite membrane with a sandwich structure;

[0028] 3) drying the sandwic...

Embodiment 2

[0032] Embodiment 2: the preparation of composite film

[0033] 1) The aqueous solution of graphene oxide, the aqueous solution of ZnS and the aqueous solution of nano-titanium oxide are uniformly mixed; The aqueous solution mass volume concentration of graphene oxide is 5mg / L, the mass volume concentration of nano-titanium oxide aqueous solution is 5mg / L, the aqueous solution mass concentration of ZnS The volume concentration is 10 mg / L; the mass ratio of graphene oxide and nano-titanium oxide is 1:0.2, and the mass ratio of ZnS and nano-titanium oxide is 1:0.8;

[0034] 2) With a PE microporous membrane with an average pore size of 12.5 microns as the substrate, the mixture solution of graphene oxide, ZnS and nano-titanium oxide is dehydrated under negative pressure by vacuum filtration, and then the mixture solution on the microporous membrane substrate is mutually Stacking self-assembly into a carbon-containing composite layer; during the suction filtration process, anothe...

Embodiment 3

[0039] Embodiment 3: the preparation of composite film

[0040] 1) The aqueous solution of graphene oxide, the aqueous solution of ZnS and the aqueous solution of nano-titanium oxide are uniformly mixed; The aqueous solution mass volume concentration of graphene oxide is 25mg / L, the mass volume concentration of nano-titanium oxide aqueous solution is 20mg / L, the aqueous solution mass concentration of ZnS The volume concentration is 20mg / L; the mass ratio of graphene oxide and nano-titanium oxide is 1:0.2, and the mass ratio of ZnS and nano-titanium oxide is 1:1;

[0041] 2) Based on the alumina porous membrane with an average pore size of 0.22 microns, the mixture solution of graphene oxide, ZnS and nano-titanium oxide is dehydrated under negative pressure by vacuum filtration, and then stacked on the microporous membrane substrate Self-assembled into a carbon-containing composite layer; during the suction filtration process, another layer of PP microporous filter membrane wit...

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Abstract

The invention discloses a composite membrane. The composite membrane is composed of a microporous filtering film, a carbon-containing composite layer and a microporous filtering film in sequence. The bore diameter of the microporous filtering films is 10 nm to 100 microns, the microporous filtering films are made of macromolecules or metal or oxide, and the carbon-containing composite layer contains partially-reduced oxidized graphene or ZnS or nano-titanium oxide. According to the composite membrane, as the two microporous filtering films are arranged on the two sides for protection, mechanical performance is high, and it can be guaranteed that the carbon-containing composite layer cannot be easily damaged. The carbon-containing composite layer can allow water molecules to pass through, but the passing rates of sodium ions, calcium ions, magnesium ions and the like in seawater are quite low. The salt removing efficiency is high, and the removing rate is 96% or above.

Description

technical field [0001] The invention relates to the field of ion separation, in particular to a composite membrane and its preparation method and application. Background technique [0002] Seawater desalination has always been an important topic in scientific research and production and life. Especially at a time when fresh water resources are becoming more and more scarce. At present, seawater desalination is mainly based on distillation technology, such as thermal multi-stage flash evaporation, thermal multiple-effect distillation and other technologies. [0003] Chinese invention patent 103086529A provides a method for preparing freshwater ice from seawater and brackish water. The method is to filter seawater or brackish water through a multi-media filter for the first stage, then pass through the security filter for the second stage, then pass through the microfiltration membrane for the third stage, and finally pass the ultrafiltration membrane for the fourth stage fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D67/00C02F1/44C02F103/08
CPCB01D69/12B01D67/0079B01D69/02B01D2323/345B01D2325/10C02F1/44C02F1/444C02F2103/08
Inventor 朱浩杨卫国
Owner JIANGSU UNIV OF SCI & TECH
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