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High-flux covalent organic skeleton composite membrane and preparation method thereof

A covalent organic framework, high-flux technology, applied in the field of high-flux covalent organic framework composite membrane and its preparation, can solve the problems of poor pressure resistance and tightness, low flux of nanofiltration membrane, easy pollution, etc. Simple and easy to implement, widen the application field, and the effect of high-efficiency removal

Active Publication Date: 2018-05-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of material properties, these nanofiltration membranes generally have disadvantages such as low flux, poor pressure resistance, and easy contamination during the separation process.

Method used

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  • High-flux covalent organic skeleton composite membrane and preparation method thereof
  • High-flux covalent organic skeleton composite membrane and preparation method thereof
  • High-flux covalent organic skeleton composite membrane and preparation method thereof

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preparation example Construction

[0030] In a second aspect, an embodiment of the present invention provides a method for preparing the above-mentioned composite membrane, including:

[0031] Step 101, using amino-terminated silane coupling agent or dopamine to chemically modify the surface of the porous basement membrane, so that the surface of the basement membrane has amino active groups, and then grafting small molecular organic compounds containing aldehyde groups to obtain a functionalized porous basement membrane;

[0032] Step 102, dissolving a certain amount of aldehyde group and amino small molecular organic matter in a solvent, adding a small amount of acetic acid solution with a concentration of 1-6M, stirring and ultrasonic treatment, and preparing a precursor solution of covalent organic materials; step 101 The functionalized porous base membrane is immersed in the precursor solution, and reacted at a certain temperature for 12-72 hours, so that the covalent organic framework material can fully gr...

Embodiment 1

[0045] Tubular ceramics (Al 2 o 3 ) porous base membrane, the average pore size and porosity of the base membrane are 0.1 μm and 40% respectively; the base membrane is chemically modified by selecting amino-terminated silane coupling agent γ-aminopropyltriethoxysilane.

[0046] Step a, immerse the tubular ceramic basement membrane in a toluene solution of an amino-terminated silane coupling agent with a concentration of 1 mM, and react at 110° C. for 2 hours after argon protection, so that the surface of the basement membrane has an amino active group; then The aminated porous base membrane was immersed in a dioxane solution of 1,3,5-benzenetricarbaldehyde at a concentration of 3 mg / ml, and reacted at 150° C. for 1 hour to obtain a functionalized porous base membrane;

[0047] Step b, dissolve 30mg of 1,3,5-benzenetricarbaldehyde and 30mg of p-phenylenediamine in 10ml of dioxane, then add a 3M acetic acid solution with a volume of 1 / 5 of dioxane, stir and Prepare a precursor...

Embodiment 2

[0053] Tubular ceramics (Al 2 o 3 ) porous base membrane, the average pore size and porosity of the base membrane are 0.1 μm and 40% respectively; the base membrane is chemically modified by selecting amino-terminated silane coupling agent γ-aminopropyltriethoxysilane.

[0054] Step a, immerse the tubular ceramic basement membrane in a toluene solution of an amino-terminated silane coupling agent with a concentration of 1 mM, and react at 110° C. for 2 hours after argon protection, so that the surface of the basement membrane has an amino active group; then immersing the aminated porous base membrane in a dioxane solution of 1,3,5-benzenetricarbaldehyde at a concentration of 30 mg / 10 ml, and reacting at 25° C. for 3 hours to obtain a functionalized porous base membrane;

[0055] Step b, dissolve 30mg of 1,3,5-benzenetricarbaldehyde and 30mg of p-phenylenediamine in 10ml of dioxane, then add a 3M acetic acid solution with a volume of 1 / 5 of dioxane, stir and Prepare a precursor...

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Abstract

The invention relates to a high-flux covalent organic skeleton composite membrane and a preparation method thereof, which belongs to the technical field of membrane separation. The high-flux covalentorganic skeleton composite membrane comprises a porous basic membrane and a covalent organic skeleton material selective separation layer in situ growing on the surface of the porous basic membrane; and the covalent organic skeleton material is an imide-type two-dimensional layered covalent organic skeleton material structure. An amino-terminated silane coupling agent or dopamine is used for chemically modifying the surface of the porous basic membrane and then grafted with an aldehyde group-containing micromolecular organic matter to obtain a functional porous basic membrane; the functional porous basic membrane is immersed in a precursor solution for synthesizing the organic skeleton material to be subjected to the reaction; and the porous basic membrane after the reaction is rinsed by adopting an organic solvent and is activated at a high temperature, thus obtaining the high-flux covalent organic skeleton composite membrane. The composite membrane prepared by the invention has highinterception rate for various dyes in water as well as good dye / salt separation performance, and also has high permeation flux.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a high-throughput covalent organic framework composite membrane and a preparation method thereof. Background technique [0002] The separation performance of the composite membrane mainly depends on the properties of the membrane material itself and the structure of the membrane. The development of new membrane materials is still a key problem to be solved at present. For example, currently commercialized nanofiltration membranes are generally composite membranes with an ultra-thin selective separation layer and a porous support layer, and the separation layer is mainly a polyamide, polyester, polyvinyl alcohol or polyelectrolyte layer. However, due to the limitations of material properties, these nanofiltration membranes generally have disadvantages such as low flux, poor pressure resistance, and easy contamination during the separation process. The deve...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00C02F1/44C02F101/30
CPCB01D67/0006B01D69/12C02F1/44C02F2101/308
Inventor 范红玮顾佳慧孟洪
Owner BEIJING UNIV OF CHEM TECH
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