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Hydrophobic porous MXene membrane as well as preparation method and application thereof

A hydrophobic and porous substrate technology, applied in the field of membrane separation, can solve the problems of low permeation flux, limited application, etc., to achieve excellent salt rejection, promote transfer, and improve anti-moisture and anti-fouling ability.

Active Publication Date: 2021-06-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its low permeation flux limits its application

Method used

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  • Hydrophobic porous MXene membrane as well as preparation method and application thereof
  • Hydrophobic porous MXene membrane as well as preparation method and application thereof
  • Hydrophobic porous MXene membrane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A kind of preparation of hydrophobic porous MXene film, comprises the following steps:

[0039] (1) 1 g of LiF was dissolved in 20 mL of 6M HCl, and the mixture was rapidly stirred at room temperature for 5 minutes. Then, within 5 minutes, 1 g Ti 3 AlC 2Add slowly to LiF / HCl mixture to avoid bumping. Afterwards, stirring was continued at 35°C for 24 hours. The resulting product was washed with deionized water and centrifuged at 3500 rpm for 5 minutes, which was repeated several times until the pH of the supernatant was >6. Then, the precipitate was dissolved in 100 mL of deionized water and ultrasonically dispersed for 30 min to delaminate the MXene flakes. Subsequently, the Ti 3 C 2 T x The solution was centrifuged at 3500rpm for 10 minutes, repeated several times until there was no sediment in the centrifuge tube. Collect the light green supernatant, i.e. the colloidal solution of MXene.

[0040] (2) First prepare a hydrolysis solution of HTEOS composed of 0....

Embodiment 2

[0046] A kind of preparation of hydrophobic porous MXene film, comprises the following steps:

[0047] (1) 2g LiF was dissolved in 40mL of 6M HCl, and the mixture was rapidly stirred at room temperature for 10 minutes. Then, 1g Ti 3 AlC 2 Add slowly to LiF / HCl mixture to avoid bumping. Afterwards, stirring was continued for 48 hours at 25°C. The resulting product was washed with deionized water and centrifuged at 5000 rpm for 10 minutes, which was repeated several times until the pH of the supernatant was >6. Then, the precipitate was dissolved in 100 mL of deionized water and ultrasonically dispersed for 60 min to delaminate the MXene flakes. Subsequently, the Ti 3 C 2 T x The solution was centrifuged at 5000rpm for 20 minutes, repeated several times until there was no sediment in the centrifuge tube. Collect the light green supernatant, i.e. the suspension of MXene.

[0048] (2) Firstly, a hydrolysis solution of HTEOS composed of 1 vol% acetic acid, 5 vol% n-hexadec...

Embodiment 3

[0054] A kind of preparation of hydrophobic porous MXene film, comprises the following steps:

[0055] (1) 4g LiF was dissolved in 80mL of 6M HCl, and the mixture was rapidly stirred at room temperature for 15 minutes. Then, 1g Ti 3 AlC 2 Add slowly to LiF / HCl mixture to avoid bumping. Afterwards, stirring was continued at 40°C for 24 hours. The resulting product was washed with deionized water and centrifuged at 6000 rpm for 5 minutes, which was repeated several times until the pH of the supernatant was >6. Then, the precipitate was dissolved in 100 mL of deionized water and ultrasonically dispersed for 30 min to delaminate the MXene flakes. Subsequently, the Ti 3 C 2 T x The solution was centrifuged at 6000rpm for 30 minutes, repeated several times until there was no sediment in the centrifuge tube. Collect the light green supernatant, i.e. the suspension of MXene.

[0056] (2) Firstly, a hydrolysis solution of HTEOS composed of 5 vol% acetic acid, 8 vol% n-hexadecy...

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Abstract

The invention discloses a hydrophobic porous MXene membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) etching three-dimensional layered MAX by using a mixed solution of LiF and HCl, performing washing, adding water, and carrying out ultrasonic dispersion to obtain a two-dimensional layered MXene suspension; (2) preparing a hydrolysis solution from a substance with low surface energy, mixing the hydrolysis solution with the two-dimensional layered MXene suspension in the step (1), and carrying out a hydrolysis reaction; and (3) carrying out vacuum filtration on the modified MXene solution obtained in the step (2) on a porous substrate membrane, and carrying out vacuum drying to obtain the hydrophobic porous MXene membrane. The prepared membrane has a porous MXene layer, and a large interlayer spacing and a gap generated by stacking provide a plurality of channels for the transmission of water molecules. The preparation method is simple, mild in condition, easy to operate and environment-friendly; the prepared membrane is acid-resistant, alkali-resistant and good in flexibility; and the membrane is used for water treatment, and has excellent durability and competitive flux.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a hydrophobic porous MXene membrane and a preparation method and application thereof. Background technique [0002] Freshwater scarcity has an increasing impact on the global economy, social stability and ecosystem balance, which prompts countries and regions to search for new water sources to supplement dwindling water resources. Desalination of seawater promises to alleviate this problem. Membrane separation technology has attracted people's attention due to its advantages of high efficiency, strong adaptability, low energy consumption, easy operation and environmental friendliness. Membrane-based humidification-dehumidification (MHDD) desalination technology driven by renewable energy has been developed as a promising method due to its high salt rejection rate, excellent antifouling performance and ability to tolerate high salinity water. , low-cost, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C02F1/44C02F103/08
CPCB01D71/02B01D67/0039C02F1/44C02F2103/08Y02A20/131
Inventor 张立志张桃董传帅
Owner SOUTH CHINA UNIV OF TECH
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