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Flexible cuttable nanocellulose/covalent organic framework composite film and preparation method thereof

A covalent organic framework and nanocellulose technology, applied in the field of composite membrane science, can solve the problems of difficult control of film growth direction, low strength of COFs film, uneven film growth, etc., achieve green raw materials, increase universality, good repeatability

Active Publication Date: 2019-09-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the research on the preparation of COFs thin films based on graphene oxide, conductive glass and silicon dioxide has gradually deepened, but the growth direction of the thin film is difficult to control during the production process, and its random expansion causes uneven and discontinuous growth of the film.
In addition, the obtained COFs films also generally have disadvantages such as low strength, irregularity, and poor crystallinity.

Method used

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  • Flexible cuttable nanocellulose/covalent organic framework composite film and preparation method thereof
  • Flexible cuttable nanocellulose/covalent organic framework composite film and preparation method thereof
  • Flexible cuttable nanocellulose/covalent organic framework composite film and preparation method thereof

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Effect test

Embodiment 1

[0045] A method for preparing a flexible and tailorable nanocellulose / covalent organic framework composite membrane, comprising the following steps:

[0046] (1) Take 0.015 g of absolute dry NFC (the C6 position is a carboxyl group, and cellulose nanocrystals are used in Example 1) and place it in a conical flask, add 30 mL of deionized water, and dissolve it evenly by ultrasonication at 40 W for 5 minutes , adjust the pH to 3, then add 60 mg of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, 0.9 g of N-hydroxysuccinimide, stir evenly and then drop by drop Add p-phenylenediamine 75 mg; in N 2 Under the protection of the atmosphere, react at room temperature for 2 h, wash it with deionized water; finally use a sand core suction filter device to perform suction filtration, and after the suction filtration is completed, remove the microporous filter membrane with a pore size of 0.25 μm, and in the micropore The front of the filter membrane continued to be covered wit...

Embodiment 2

[0050] A method for preparing a flexible and tailorable nanocellulose / covalent organic framework composite membrane, comprising the following steps:

[0051] (1) Take 0.08 g of dry NFC (the C6 position is a carboxyl group, and cellulose nanofibers are used in Example 2) and place it in a conical flask, add 30 mL of deionized water, and ultrasonically dissolve it at 40 W for 5 minutes , adjust the pH to 5.5, then add 200 mg of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, 1.5 g of N-hydroxysuccinimide, stir evenly and then drop by drop Add 16 mg p-phenylenediamine; in N 2 Under the protection of the atmosphere, react at room temperature for 4 hours, and wash it with deionized water; finally, use a sand core suction filter device to perform suction filtration. After the suction filtration is completed, remove the microporous filter membrane with a pore size of 3 μm. The front of the membrane is continuously covered with a layer of microporous filter membrane with ...

Embodiment 3

[0055] A method for preparing a flexible and tailorable nanocellulose / covalent organic framework composite membrane, comprising the following steps:

[0056] (1) Take 0.08 g of absolute dry NFC (the C6 position is a carboxyl group, and bacterial cellulose is used in Example 3) and place it in a conical flask, add 30 mL of deionized water, and dissolve it evenly by ultrasonication at 40 W for 5 minutes. Adjust the pH to 7, then add 200 mg of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 1.5 g of N-hydroxysuccinimide, stir evenly with a magnetic force and then add dropwise p-Phenylenediamine 0.4 g; in N 2 Under the protection of the atmosphere, react for 4 hours, wash it with deionized water; finally use a sand core suction filter device to perform suction filtration, and after the suction filtration is completed, remove the microporous filter membrane with a pore size of 1 μm, and put it on the microporous filter membrane. Continue to cover a layer of micropor...

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Abstract

The invention discloses a flexible cuttable nanocellulose / covalent organic framework composite film and a preparation method thereof. The method comprises the following steps: chemically modifying nanocellulose (the carboxyl group is located at the C6 position) by using an amide condensation reaction to make an amino active group located at the C6 position of the nanocellulose, and carrying out vacuum suction filtration and drying on the obtained product to obtain a modified nanocellulose film; immersing the modified nanocellulose film in a 1,3,5-triformylphloroglucinol and p-phenylenediaminecovalent organic framework material precursor solution, and carrying out a solvothermal reaction in the presence of a catalyst; and ultrasonically washing the obtained reaction product with an organicsolvent, and carrying out high temperature activation in an oven to obtain the flexible cuttable nanocellulose / covalent organic framework composite film. The obtained flexible and cuttable compositefilm has the advantages of good film forming quality, compact, continuous, uniform and flat surface and good repeatability, and greatly maintains the crystallinity of the covalent organic framework material.

Description

technical field [0001] The invention belongs to the field of composite membrane science and technology, and specifically relates to a flexible and tailorable nanocellulose / covalent organic framework material composite membrane and a preparation method thereof. Background technique [0002] Covalent organic frameworks (COFs) are a new class of porous crystalline materials that are usually combined by strong covalent bonds between light elements such as C, B, O, N, and Si. This kind of material has the advantages of low density, high specific surface area, high porosity, and adjustable pore size. It has broad application prospects in the fields of gas storage and separation, optoelectronic devices, biosensing, and heterogeneous catalysis. However, because COFs have disadvantages such as difficulty in film formation, non-uniform film growth, and difficulty in separating the formed COFs film from the substrate, most of the synthesized COFs materials currently reported exist in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D69/12B01D67/00
CPCB01D67/0006B01D69/12B01D71/10
Inventor 万小芳何骞郭从宝陈广学
Owner SOUTH CHINA UNIV OF TECH
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