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Lanthanide fluoride two-dimensional nanosheet membrane and preparation method and application thereof

A lanthanide and two-dimensional nanotechnology, applied in the field of membrane separation, can solve problems such as changes, difficulty in industrial production, changes in selectivity and separation efficiency of graphene oxide membranes, and achieve high water flux and reusability The effect of high frequency and excellent water stability

Active Publication Date: 2021-09-07
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing two-dimensional membranes, such as graphene oxide membranes, easily swell in the solution and change the membrane structure, resulting in changes in the selectivity and separation efficiency of graphene oxide membranes, which are difficult to apply in actual industrial production.

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  • Lanthanide fluoride two-dimensional nanosheet membrane and preparation method and application thereof
  • Lanthanide fluoride two-dimensional nanosheet membrane and preparation method and application thereof
  • Lanthanide fluoride two-dimensional nanosheet membrane and preparation method and application thereof

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preparation example Construction

[0032] The invention provides a preparation method of a lanthanide fluoride two-dimensional nanosheet film, comprising the following steps:

[0033] In an inert gas atmosphere, water-soluble lanthanide metal salts and sodium acetate aqueous solution are mixed to obtain a mixed solution;

[0034] mixing the mixed solution with an aqueous fluorine-containing salt solution, and performing a precipitation reaction to obtain a suspension of two-dimensional nanosheets of lanthanide fluoride;

[0035] The lanthanide fluoride two-dimensional nanosheet suspension is deposited on a porous substrate, and dried to obtain the lanthanide fluoride two-dimensional nanosheet membrane, and the porous substrate is a polyethersulfone membrane, a nylon membrane, a poly Vinylidene fluoride membrane, polycarbonate membrane, ceramic membrane, metal membrane or anodized aluminum membrane.

[0036] The invention mixes water-soluble lanthanide metal salts and sodium acetate aqueous solution in an inert...

Embodiment 1

[0063] A method for preparing a high-performance lanthanide fluoride two-dimensional nanosheet film, comprising the following steps:

[0064] (1) In an inert gas atmosphere, dissolve 3.6mmol of cerium nitrate and 3.6mmol of sodium acetate solid powder in 300mL of deionized water successively, and stir until fully dissolved;

[0065] (2) Add 20 mL, 5 mg / mL ammonium fluoride aqueous solution to the mixed solution obtained in step (1), and react at room temperature for 2 h under stirring conditions to obtain a fluorine-cerium (F-Ce) nanosheet solution;

[0066] (3) Take 2mL of the F-Ce nanosheet solution prepared in step (2), and dilute it to 100mL with deionized water, and then through vacuum filtration, the F-Ce nanosheet is evenly loaded onto a polymer with a pore size of 60nm. On the ethersulfone porous substrate, the corresponding loading of F-Ce nanosheets is 0.57g / m 2 , after vacuum drying for 24h, a high-performance F-Ce two-dimensional nanosheet film was obtained.

[0...

Embodiment 2

[0071] A method for preparing a high-performance lanthanide fluoride two-dimensional nanosheet film, comprising the following steps:

[0072] (1) In an inert gas atmosphere, dissolve 1.2mmol of cerium acetate and 3.6mmol of sodium acetate solid powder in 200mL of deionized water successively, and stir until fully dissolved;

[0073] (2) Add 50mL, 30mg / mL sodium fluoride aqueous solution to the mixed solution obtained in step (1), react at room temperature for 5h under stirring conditions, and then centrifuge (3000rpm / min, 60min) to obtain F-Ce nanosheet suspension can be obtained;

[0074] (3) Take 4mL of the F-Ce nanosheet solution prepared in step (2), and dilute it to 100mL with deionized water, and then through vacuum filtration, the F-Ce nanosheets are evenly loaded onto a polymer with a pore size of 100nm. On the carbonate porous substrate, the corresponding loading of F-Ce nanosheets is 1.08g / m 2 , after vacuum drying for 24h, a high-performance F-Ce two-dimensional n...

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Abstract

The invention provides a lanthanide fluoride two-dimensional nanosheet membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: mixing water-soluble lanthanide metal salts with a sodium acetate aqueous solution in inert gas to obtain a mixed solution; mixing the mixed solution with a fluorine-containing salt aqueous solution, and carrying out precipitation reaction to obtain a lanthanide fluoride two-dimensional nanosheet suspension; depositing the lanthanide fluoride two-dimensional nanosheet suspensionon a porous substrate, carrying out drying to obtain the lanthanide fluoride two-dimensional nanosheet membrane, wherein the porous substrate is a polyethersulfone membrane, a nylon membrane, a polyvinylidene fluoride membrane, a polycarbonate membrane, a ceramic membrane, a metal membrane or an anodic aluminum oxide membrane. The lanthanide fluoride two-dimensional nanosheet membrane prepared by the invention has the characteristics of high permeability, high separation precision and good stability, and the preparation method is simple; and when the porous substrate is an inorganic membrane, the prepared lanthanide fluoride two-dimensional nanosheet membrane has high solvent resistance and separation performance.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a two-dimensional nanosheet membrane of lanthanide fluoride and its preparation method and application. Background technique [0002] With the rapid development of the global economy, the problem of water pollution caused by human production and living activities is becoming more and more serious. It is an urgent problem for human beings to actively develop efficient and sustainable technologies to obtain clean fresh water. Membrane separation-based water treatment technology has the advantages of low energy consumption, high treatment efficiency, and easy modularization, and has played an important role in coping with water shortages, ensuring drinking water safety, and water pollution control. In industrial production, a large number of organic solvents are widely used in petroleum and petrochemical, pharmaceutical, printing, textile and other fields. At present, c...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/50B01D71/34B01D71/02B01D67/00C02F1/44C02F101/30
CPCB01D71/68B01D71/50B01D71/34B01D71/025B01D67/0079C02F1/44B01D2325/30C02F2101/308
Inventor 张玉忠解莹芳叶卉李泓
Owner TIANJIN POLYTECHNIC UNIV
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