Chitosan-modified mesoporous silica-filled hybrid membrane as well as preparation and application thereof

A technology of mesoporous silica and silica filling, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve the problems of particle agglomeration, interface defects, affecting the gas separation performance of membranes, etc., and achieve a simple preparation process. , easy to operate, the effect of improving interface compatibility

Inactive Publication Date: 2015-05-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation of hybrid membranes is prone to problems such as interface defects and particle agglomeration, which affect the gas separation performance of the membrane.

Method used

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  • Chitosan-modified mesoporous silica-filled hybrid membrane as well as preparation and application thereof
  • Chitosan-modified mesoporous silica-filled hybrid membrane as well as preparation and application thereof
  • Chitosan-modified mesoporous silica-filled hybrid membrane as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of chitosan-modified mesoporous silica-filled hybrid membrane.

[0022] The hybrid membrane has a thickness of 85 μm, and is composed of 12.5 g of polyoxyethylene-polycaprolactam block copolymer with a mass fraction of 4% and 0.05 g of chitosan-modified mesoporous silica. In the caprolactam block copolymer, the polyoxyethylene segment accounts for 60% of the mass fraction of the block copolymer, and the polycaprolactam segment accounts for 40% of the mass fraction of the block copolymer. The preparation steps of the hybrid membrane are as follows:

[0023] Step 1, preparation of chitosan-modified mesoporous silica:

[0024] Step 1-1. Measure 480ml of deionized water, add 1.0g of cetyltrimethylammonium bromide, and stir the liquid into a homogeneous phase, then add 3.5ml of 2.0mol / L NaOH solution dropwise. After the oil bath reaches 80°C, continue to stir for 40 minutes, slowly add 5ml of tetraethyl orthosilicate dropwise, and keep at 80°C, and st...

Embodiment 2

[0030] Example 2: Preparation of chitosan-modified mesoporous silica-filled hybrid membrane.

[0031] The thickness of the hybrid membrane is 89 μm, and it is composed of 12.5g of polyoxyethylene-polycaprolactam block copolymer with a mass fraction of 4% and 0.05g of chitosan-modified mesoporous silica. In the caprolactam block copolymer, the polyoxyethylene segment accounts for 60% of the mass fraction of the block copolymer, and the polycaprolactam segment accounts for 40% of the mass fraction of the block copolymer. The difference between its preparation method and the above-mentioned embodiment 1 Only: in step 3, the amount of chitosan-modified mesoporous silica was changed from 0.025 g to 0.05 g, and finally a chitosan-modified mesoporous silica-filled hybrid membrane with a thickness of 89 μm was obtained. figure 2 is the SEM sectional view of the hybrid membrane prepared in Example 2.

[0032] The hybrid membrane was used to separate CO at room temperature and 1 bar ...

Embodiment 3

[0033] Example 3: Preparation of chitosan-modified mesoporous silica-filled hybrid membrane.

[0034] The thickness of the hybrid membrane is 96 μm, and it is composed of 12.5g of polyoxyethylene-polycaprolactam block copolymer with a mass fraction of 4% and 0.075g of chitosan-modified mesoporous silica. In the caprolactam block copolymer, the polyoxyethylene segment accounts for 60% of the mass fraction of the block copolymer, and the polycaprolactam segment accounts for 40% of the mass fraction of the block copolymer. The difference between its preparation method and the above-mentioned embodiment 1 Only: in step 3, the amount of sulfonic acid-functionalized hollow nano-hydrogel was changed from 0.025 g to 0.075 g, and finally a chitosan-modified mesoporous silica-filled hybrid membrane with a thickness of 96 μm was obtained. image 3 It is the SEM sectional view of the hybrid film prepared in Example 3.

[0035] The hybrid membrane was used to separate CO at room temperatu...

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Abstract

The invention discloses a chitosan-modified mesoporous silica-filled hybrid membrane which is composed of a polyoxyethylene-polycaprolactam block copolymer and chitosan-modified mesoporous silica. A preparation process comprises the following steps: preparing chitosan-modified mesoporous silica; preparing a polyoxyethylene-polycaprolactam block copolymer solution; adding the chitosan-modified mesoporous silica into the polyoxyethylene-polycaprolactam block copolymer solution to prepare a membrane casting solution, and finally preparing the chitosan-modified mesoporous silica-filled hybrid membrane. According to the invention, the hybrid membrane has excellent membrane separation performance; the preparation method is easy to operate; the used membrane materials are low in price; when the hybrid membrane is used for separating CO2/CH4 gas mixture, the CO2 flux is 1835barrer, and the CO2/CH4 separation factor is 36; when the hybrid membrane is used for separating CO2/N2 gas mixture, the flux is 1943barrer, and the CO2/N2 separation factor is 85.

Description

technical field [0001] The invention relates to a gas separation membrane, in particular to a chitosan-modified mesoporous silica-filled hybrid membrane, a preparation method and application thereof. Background technique [0002] Due to the greenhouse gas CO 2 A series of environmental problems brought about by high-efficiency carbon capture methods have attracted widespread attention from all over the world. Compared with traditional gas separation methods such as absorption method, adsorption method and cryogenic separation, membrane separation method is a new type of gas separation method, with its high separation efficiency, low energy consumption, flexible process, simple equipment, easy operation, Environmental friendliness and other features in CO 2 The field of capture has potential advantages. At present, the types of gas separation membranes are mainly divided into polymer membranes, inorganic membranes and organic-inorganic hybrid membranes. For polymer membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D67/00B01D53/22
CPCY02C20/40
Inventor 吴洪李雪琴姜忠义程友东张诗雨刘雨辰
Owner TIANJIN UNIV
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