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A mixed matrix membrane filled with lanthanide fluoride porous nanosheets and its preparation method and application

A technology of mixed matrix membrane and fluoride, applied in chemical instruments and methods, separation methods, membrane technology and other directions, can solve the problem of not being able to achieve both polymer membrane and inorganic membrane, and achieve low preparation cost, mild preparation conditions, The effect of good interfacial compatibility and interfacial adhesion

Active Publication Date: 2021-12-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing polymer-inorganic hybrid matrix membranes cannot actually achieve the effect of combining the advantages of polymer membranes and inorganic membranes.

Method used

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  • A mixed matrix membrane filled with lanthanide fluoride porous nanosheets and its preparation method and application
  • A mixed matrix membrane filled with lanthanide fluoride porous nanosheets and its preparation method and application
  • A mixed matrix membrane filled with lanthanide fluoride porous nanosheets and its preparation method and application

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preparation example Construction

[0049] The embodiment of the present invention also provides a method for preparing a mixed matrix membrane filled with two-dimensional porous nanosheets of lanthanide fluorides as described above, which specifically includes the following steps:

[0050] (1) The prepared two-dimensional porous nanosheets of lanthanide fluorides are added to the composite solvent according to the solid-to-liquid ratio of (0.02-0.3): (3-5) (g / ml) for ultrasonic dispersion to obtain lanthanide fluorides compound two-dimensional porous nanosheet solution;

[0051] (2) adding polyoxyethylene-based polymers into the composite solvent, and stirring under reflux at 80° C. for 1 to 3 hours to obtain a polyoxyethylene-based polymer solution with a mass fraction of 3% to 15%;

[0052] (3) Mix the lanthanide fluoride two-dimensional porous nanosheet solution and the polyoxyethylene-based polymer solution evenly to obtain a casting solution, defoam the casting solution and pour it into a clean polytetrafl...

Embodiment 1

[0058] Embodiment 1 of the present invention discloses a method for preparing a mixed matrix membrane filled with cerium fluoride two-dimensional porous nanosheets, which specifically includes the following steps:

[0059] (1) Preparation of two-dimensional porous nanosheets of cerium fluoride:

[0060] (a) Take 300mL of pure water and put it into a three-necked flask. After bubbling nitrogen gas for 20 minutes, add 3.6mmol of cerium nitrate and 3.6mmol of sodium acetate solid powder in sequence, wherein the molar ratio of cerium nitrate and sodium acetate is 1:1, at 25°C Dissolved after stirring under the conditions to obtain a mixed solution;

[0061] (b) Add 20ml, 5mg / mL ammonium fluoride aqueous solution to the above mixture, stir and react at room temperature for 2h, centrifuge and freeze-dry to obtain two-dimensional porous nanosheets of cerium fluoride.

[0062] Take 0.09g of the above-prepared two-dimensional porous nanosheets of cerium fluoride and add them to 4ml of...

Embodiment 2

[0067] Example 2 of the present invention discloses the preparation of a mixed matrix membrane filled with cerium fluoride two-dimensional porous nanosheets. In step (1) of Example 1, "take 0.09 g of the above-mentioned two-dimensional porous nanosheets of cerium fluoride" Amended to "Take 0.18g of the cerium fluoride two-dimensional porous nanosheets prepared above", and prepare a polyoxyethylene-based polymer-cerium fluoride two-dimensional porous nanosheets mixed matrix membrane with a thickness of 93 μm, in which the cerium fluoride in the membrane The mass fraction of two-dimensional porous nanosheets is 20%.

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Abstract

The invention discloses a mixed matrix membrane filled with two-dimensional porous nanosheets of lanthanide fluorides, which comprises the following components in mass fraction: 0.5% to 30% of two-dimensional porous nanosheets of lanthanide fluorides, and polyoxyethylene-based high The molecular weight is 70%-99.5%; the lanthanide fluoride two-dimensional porous nanosheet is the dispersed phase, and the polyoxyethylene-based macromolecule is the continuous phase. Among them, lanthanide fluoride two-dimensional porous nanosheets are a new type of nanomaterials. Using lanthanide fluoride two-dimensional porous nanosheets as fillers to prepare polymer-inorganic mixed matrix membranes can improve polymer-inorganic mixed matrix membranes. actual use performance.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, and more specifically relates to a mixed matrix membrane filled with lanthanide fluoride porous nanosheets and its preparation method and application. Background technique [0002] The rapid development of industry in the world today mainly depends on non-renewable fossil fuels, and with the increasing use of fossil fuels, it also causes CO 2 The rapid increase in emissions has made the global carbon pollution situation increasingly severe. Moreover, gaseous energy sources rich in methane and hydrogen, such as natural gas, coal bed methane, biogas, oilfield gas, etc., often contain more CO 2 , resulting in a reduction in the utilization rate of gaseous energy and a waste of resources. And in order to reduce CO 2 emissions, recovery of CO in gaseous energy 2 , gas separation is required, and the gas membrane separation technology that can achieve this purpose has attracted wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/52B01D67/00B01D53/22
CPCB01D71/52B01D67/0079B01D53/228
Inventor 张玉忠马蔷辛清萍李泓张磊涛
Owner TIANJIN POLYTECHNIC UNIV