Composite membrane containing covalent organic framework material, and preparation method thereof

A covalent organic framework and composite membrane technology, applied in the field of membrane separation, can solve the problems of limited types of membrane materials, and achieve the effects of enhanced filtration and sterilization performance, strong stability, and simple preparation methods

Active Publication Date: 2020-02-14
孝感市思远新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, physical and chemical treatment as the pretreatment of dye wastewater is very critical. Physical and chemical methods such as adsorption, ion exchange, coagulation-flocculation, advanced oxidation, membrane separation, and electrochemistry have been applied to dye decolorization; membrane separation is efficient and energy-saving. , environmental protection, molecular-level filtration and simple filtration process, easy to control, etc., it is of great significance to develop new membrane materials for the separation and screening of organic dyes. At present, there are very few membrane materials that can be used for dye separation, mainly because the types of membrane materials are limited. Can not meet the needs of various dye separation

Method used

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  • Composite membrane containing covalent organic framework material, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 16.6 parts of p-phenylenediamine and 30 parts of ethanol into the beaker, stir for 5 minutes, then add 26 parts of trimerol trimaldehyde and 10 parts of acetic acid, heat and stir at 90°C for 12 hours, then filter to obtain a solid covalent organic framework material Powder, the size of covalent organic framework material powder is between 1 and 1000 nanometers; dissolve 50 parts of PVDF in 20 parts of DMF, the size of PVDF is between 1 and 1000 microns, add 30 parts of solid covalent organic framework material powder , to obtain a mixed solvent, after stirring for 10 minutes, spread the mixed solvent on a glass plate, program the temperature at 100°C and maintain it for 12 hours, after the mixed solvent evaporates and dries, a composite film is obtained, put the glass plate with the composite film in water, and compound The membrane was peeled off naturally; the composite membrane was washed several times with distilled water and dried for later use.

Embodiment 2

[0021] Add 17.6 parts of dimethyl-p-phenylenediamine and 30 parts of ethanol to the beaker, stir for 5 minutes, then add 26 parts of trimerolbenzenetrialdehyde, 10 parts of acetic acid, heat and stir at 90°C for 12 hours, then filter to obtain solid covalent Organic framework material powder, the size of covalent organic framework material powder is between 1 and 1000 nanometers; dissolve 50 parts of PVDF in 20 parts of DMF, the size of PVDF is between 1 and 1000 microns, add 30 parts of solid covalent organic The frame material is powdered to obtain a mixed solvent. After stirring for 10 minutes, the mixed solvent is spread on a glass plate, and the temperature is controlled at 100°C for 12 hours. After the mixed solvent is volatilized and dried, a composite film is obtained, and the glass plate with the composite film is placed in In water, the composite membrane peeled off naturally; the composite membrane was washed several times with distilled water, and dried for later us...

Embodiment 3

[0023] Add 20.1 parts of dimethoxy-p-phenylenediamine and 30 parts of ethanol to the beaker, stir for 5 minutes, then add 26 parts of trimerolbenzenetrialdehyde and 10 parts of hydrochloric acid, heat and stir at 90°C for 12 hours, then filter to obtain a solid co- Covalent organic framework material powder, the size of covalent organic framework material powder is between 1 and 1000 nanometers; dissolve 50 parts of PVDF in 20 parts of DMF, the size of PVDF is between 1 and 1000 microns, add 30 parts of solid covalent The organic framework material powder is obtained as a mixed solvent. After stirring for 10 minutes, spread the mixed solvent on a glass plate. The temperature is controlled at 100°C for 12 hours. After the mixed solvent is volatilized and dried, a composite film is obtained. Put the glass plate with the composite film on the After immersing in water, the composite film will peel off naturally; wash the composite film several times with distilled water, and dry it...

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Abstract

The invention provides a composite membrane containing a covalent organic framework material, and a preparation method thereof, wherein the composite membrane comprises, by weight, 15-25 parts of an aniline compound, 15-26 parts of s-trisphenol benzenetrialdehyde, 8-10 parts of a catalyst, 25-35 parts of ethanol, 40-60 parts of PVDF and 15-25 parts of DMF. According to the invention, by compounding the covalent organic framework material and PVDF, the membrane preparation cost is reduced, and the covalent organic framework material can be uniformly dispersed in PVDF as the substrate, wherein PVDF can form micron-scale holes with a size of 1-1000 [mu]m, and comprises endpoint values, and the covalent organic framework has regular and uniform nano-scale holes with a size of 1-1000 nm and comprises endpoint values, so that the filtering and sterilization effects on different dyes are greatly enhanced through the micron-scale and nano-scale hierarchical holes.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a composite membrane containing a covalent organic framework material and a preparation method thereof. Background technique [0002] Dyestuff is an important fine chemical product, which is closely related to human's basic necessities of life. With the rapid development of the dye industry, its production wastewater has become one of the main sources of water pollution. The currently recognized effective way to treat dye wastewater is: first pretreatment and decolorization by physical and chemical methods to remove dye molecules with high biological toxicity and high chroma, and improve the biodegradability of wastewater, and then through subsequent biochemical treatment for comprehensive treatment. Among them, physical and chemical treatment as the pretreatment of dye wastewater is very critical. Physical and chemical methods such as adsorption, ion exchange, coagu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D69/02B01D67/00
CPCB01D71/34B01D69/12B01D69/02B01D67/0002B01D2311/2649B01D2325/48
Inventor 刘思
Owner 孝感市思远新材料科技有限公司
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