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Root-like self-repairing anti-pollution ZnO/MXene base membrane as well as preparation method and application of fibrous-like self-repairing anti-pollution ZnO/MXene base membrane

A self-healing and anti-pollution technology, applied in the field of membrane separation, can solve problems such as membrane seawater pollution, and achieve the effects of strong resistance to hydrophilic pollution, high moisture permeability, and general anti-pollution performance.

Pending Publication Date: 2022-08-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the pollution problem faced by the current membrane seawater desalination, the purpose of the present invention is to provide a method for preparing a self-repairing and anti-pollution ZnO / MXene base membrane

Method used

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  • Root-like self-repairing anti-pollution ZnO/MXene base membrane as well as preparation method and application of fibrous-like self-repairing anti-pollution ZnO/MXene base membrane
  • Root-like self-repairing anti-pollution ZnO/MXene base membrane as well as preparation method and application of fibrous-like self-repairing anti-pollution ZnO/MXene base membrane
  • Root-like self-repairing anti-pollution ZnO/MXene base membrane as well as preparation method and application of fibrous-like self-repairing anti-pollution ZnO/MXene base membrane

Examples

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preparation example Construction

[0042] The preparation method of the MXene solution used in the embodiment comprises the following steps:

[0043] The three-dimensional layered MAX was etched with a mixed solution of LiF and HCl, and after washing, water was added for ultrasonic dispersion to obtain a two-dimensional layered MXene suspension; the mixed solution etched the A layer of the three-dimensional layered MAX, and the removed A was -F, - OH and -O functional groups are substituted, and they are adsorbed on the surface of MXene to form end groups; the molar ratio of LiF and HCl is 1:2, and the molar ratio of MAX and LiF is 1:10; the etched The temperature was 35°C, and the etching time was 24h.

[0044] The "contact angle" in the present invention is the "water contact angle".

Embodiment 1

[0046] A preparation method of a fibrous root-like self-healing anti-pollution ZnO / MXene base film, comprising the following steps:

[0047] (1) Preparation of ZnO seed solution: ZnO with a particle size of 20 nm is dissolved in a certain amount of water to prepare a 25 wt% ZnO seed solution;

[0048] (2) Measure 5 μL of the seed solution prepared in step (1) in 100 mL of deionized water, and vacuum filtration to deposit the seeds on a polyvinylidene fluoride PVDF porous base film with a pore size of 0.45 μm. The ratio of basement membrane area is 2mL:5cm 2 , dried at room temperature for 6h;

[0049] (3) Suspend the film obtained in step (2) in a solution of ZnO (particle size: 20 nm) with a mass fraction of 1 wt%, at a rate of 20 rmin. -1 Stir at a high speed for 30min, rinse the surface with deionized water, and dry at room temperature for 10h;

[0050] (4) The membrane obtained in step (3) was suspended in an aqueous solution containing zinc nitrate hexahydrate (50 mM) ...

Embodiment 2

[0055] A preparation method of a fibrous root-like self-healing anti-pollution ZnO / MXene base film, comprising the following steps:

[0056] (1) ZnO seed solution preparation: ZnO with a particle size of 50 nm is dissolved in a certain amount of water to prepare a 15wt% ZnO seed solution;

[0057] (2) Measure 3 μL of the seed solution prepared in step (1) in 50 mL of deionized water, and vacuum filtration to deposit the seeds on a 0.22 μm pore size polytetrafluoroethylene PTFE porous base film. The volume of the solution and the porous The ratio of basement membrane area is 5mL:20cm 2 , dried at room temperature for 10h;

[0058] (3) Suspend the film obtained in step (2) in a ZnO solution with a mass fraction of 0.5 wt % (particle size is 50 nm), at 40 rpm -1 Stir at a high speed for 20 min, rinse the surface with deionized water, and dry at 40 °C for 5 h;

[0059] (4) The membrane obtained in step (3) was suspended in a solution (20 mM) containing an aqueous solution of zi...

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Abstract

The invention discloses a fibrous-root-like self-repairing anti-pollution ZnO / MXene base membrane as well as a preparation method and an application of the fibrous-root-like self-repairing anti-pollution ZnO / MXene base membrane. The preparation method comprises the following steps: dissolving nano ZnO in water to prepare a ZnO seed solution, diluting, carrying out vacuum filtration, depositing ZnO seeds on a porous substrate film, and drying; suspending the obtained porous substrate membrane in a stirred ZnO solution, washing and drying; suspending the obtained porous substrate membrane in an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine, reacting, washing and drying; and immersing the obtained porous substrate membrane into an MXene solution for reaction, washing and dehydrating. The permeation flux of the prepared membrane reaches 3.93 kg.m <-2 >. H <-1 >, and the salt rejection rate is 99.9% or above; due to the super-hydrophobicity and rough surface of the membrane, the membrane has relatively strong hydrophilic water pollution resistance. Reversible conversion of hydrophobicity and hydrophilicity and self-repairing of the membrane are realized through ultraviolet irradiation, and the membrane has a sustainable seawater desalination application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a fibrous root-like self-repairing and anti-pollution ZnO / MXene base membrane and a preparation method and application thereof. Background technique [0002] Freshwater is an essential component of many life on Earth, and its importance cannot be overstated; however, due to economic development and water pollution, freshwater shortages are further exacerbated. The current global demand cannot be met by "throttling" alone, and must be "open source", and desalination is a potential way to solve this problem. Membrane-based humidification-dehumidification desalination (MHDD) technology combining solar, geothermal, or waste heat resources provides a low-cost thermally driven desalination technology; however, membrane fouling and fouling remain major obstacles to its industrial application. The superhydrophobic modification of the membrane surface has been sho...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D71/06B01D71/16B01D71/34B01D71/36B01D67/00B01D69/02C02F1/44C02F103/08
CPCB01D71/024B01D71/02B01D71/021B01D71/022B01D71/34B01D71/16B01D71/36B01D71/06B01D69/02B01D67/0079C02F1/44B01D2325/38B01D2323/08C02F2103/08B01D2325/022Y02W10/37
Inventor 张立志张桃
Owner SOUTH CHINA UNIV OF TECH
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