Composite forward osmosis membrane based on superthin support layer and preparation method thereof

A forward osmosis membrane and support layer technology, applied in the field of membrane separation, can solve problems such as the difficulty of the membrane thickness of the support layer, and achieve the effects of increasing water flux, reducing thickness, and reducing internal concentration polarization

Inactive Publication Date: 2016-02-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the strength and preparation method of the traditional polymer membrane support layer, it is relatively difficult to further significantly reduce the thickness of the support layer membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 0.01g of multi-walled carbon nanotubes and 0.02g of graphene oxide and disperse them in 20mLN-N dimethylformamide, and obtain a uniformly dispersed mixed solution through mechanical stirring and ultrasonic oscillation; for the above-mentioned graphene / carbon nanotube dispersion The solution was vacuum filtered through a cellulose acetate microporous membrane, and the obtained filter cake was dried at 40°C, and the filter membrane was peeled off to obtain a self-supporting graphene / carbon nanotube membrane; 1g m-phenylenediamine, 0.6mL triethyl Dissolve amine and 0.075g sodium lauryl sulfate in 50mL water to prepare m-phenylenediamine aqueous phase solution; dissolve 0.2g trimesoyl chloride in 50mL n-hexane solution to prepare trimesoyl chloride oil phase solution; The graphene / carbon nanotube film is placed on the m-phenylenediamine aqueous phase solution, so that the graphene / carbon nanotube film is located on the surface of the aqueous phase solution; then the tr...

Embodiment 2

[0014] Weigh 0.02g of carboxylated single-walled carbon nanotubes and 0.1g of reduced graphene oxide and disperse them in 20mL of N-methylpyrrolidone, and obtain a uniformly dispersed mixed solution through mechanical stirring and ultrasonic oscillation; The solution was vacuum filtered through a polyvinyl chloride microporous membrane, and the obtained filter cake was dried at 40°C, and the filter membrane was peeled off to obtain a self-supporting graphene / carbon nanotube membrane; 2g p-phenylenediamine, 0.5mL triethylene Dissolve amine and 0.06g sodium lauryl sulfate in 50mL water to prepare an aqueous phase solution of p-phenylenediamine; dissolve 0.16g pyromellitic chloride in 50mL n-hexane solution to prepare a pyromellitic chloride oil phase solution; the graphene / carbon nanotube film is placed on the p-phenylenediamine aqueous solution, so that the graphene / carbon nanotube film is located on the surface of the aqueous solution; then the pyromellitic chloride solution is...

Embodiment 3

[0016] Weigh 0.005g of aminated carbon nanotubes and 0.05g of aminated graphene oxide and disperse them in 20mLN-N dimethylacetamide, and obtain a uniformly dispersed mixed solution through mechanical stirring and ultrasonic oscillation; for the above-mentioned graphene / carbon The nanotube dispersion was vacuum filtered through a polypropylene microporous membrane, and the obtained filter cake was dried at 40°C, and the filter membrane was peeled off to obtain a self-supporting graphene / carbon nanotube membrane; 2.5g of o-phenylenediamine, 0.7 Dissolve mL triethylamine and 0.08g sodium lauryl sulfate in 50mL water to prepare o-phenylenediamine aqueous phase solution; dissolve 0.3g terephthaloyl chloride in 50mL n-hexane solution to prepare terephthalamide Acyl chloride oil phase solution; the graphene / carbon nanotube film is placed on the o-phenylenediamine aqueous phase solution, so that the graphene / carbon nanotube film is located on the surface of the aqueous phase solution;...

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Abstract

The invention provides a forward osmosis membrane using graphene/carbon nanometer tube film as a support layer and directly performing interface polymerizing on surface and a preparation method. The preparation method comprises the following steps of firstly, manufacturing a self-supported graphene/carbon nanometer tube film, paving a polyamine-chloride polyamide selecting layer on the self-supported graphene/carbon nanometer tube film by an interface polymerizing method, drying, and performing heat treatment, so as to obtain a composite forward osmosis membrane. The forward osmosis membrane has the advantages that the self-supported graphene/carbon nanometer tube film with excellent property and structure is used as a novel superthin support layer, so that on one hand, the carbon nanometer tube structure is similar to the graphene, the compatibility is good, and a macro material can be well formed; on the other hand, the carbon nanometer tube and the graphene are mutually intercalated, so as to promote multiple water molecules to enter between the graphene layers; the thickness of the support layer is greatly reduced, the polarizing of inner concentration is effectively decreased, the water flux is greatly increased, and the high-flux forward osmosis membrane is obtained.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a composite forward osmosis membrane based on an ultrathin support layer and a preparation method thereof. Background technique [0002] The forward osmosis membrane separation process is a new type of membrane separation technology developed in recent years. It uses the osmotic pressure difference on both sides of the membrane as the driving force to realize water transfer spontaneously. Compared with the traditional pressure-driven membrane process, forward osmosis The process has the advantages of low energy consumption, high recovery rate, zero discharge, low pollution, and no need for external pressure. Due to these advantages of the forward osmosis process, it has broad development space in the fields of seawater desalination, food concentration, industrial wastewater treatment, power generation, and drug controlled release. However, the concentrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00B01D61/00B01D71/02B01D71/04
Inventor 徐志伟吴腾飞倪亚石睫王维
Owner TIANJIN POLYTECHNIC UNIV
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