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Method for preparing superhydrophobic oil-water separation mesh membrane in one step

An off-grid, super-thin technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of copper mesh surface roughness, expensive fluorine-containing reagents, complex preparation process, etc., and achieve chemical resistance and mechanical Good performance, easy cleaning and storage, and simplified preparation process

Inactive Publication Date: 2019-09-06
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent of CN1721030A discloses a method of utilizing perfluoroalkyl siloxane gel sol to prepare a filter membrane for oil-water separation, but expensive fluorine-containing reagents are required, which is difficult to achieve large-scale application; document Applied Surface Science, 2012, 261, 561 reported a method for preparing super-hydrophobic / super-oleophilic cotton fibers by layer-by-layer self-assembly method. A way to place commercial copper grids ahead of HNO 3 Etching in solution to roughen the surface of copper mesh, and further modifying with low surface energy substances to obtain superhydrophobic / superoleophilic oil-water separation materials. The concentrated nitric acid solution used in this method is not only highly corrosive, but also environmentally friendly. create pollution

Method used

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  • Method for preparing superhydrophobic oil-water separation mesh membrane in one step
  • Method for preparing superhydrophobic oil-water separation mesh membrane in one step
  • Method for preparing superhydrophobic oil-water separation mesh membrane in one step

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Ultrasonic clean the 400-mesh copper mesh with acetone, ethanol and deionized water for 15 minutes to remove surface oil, then put the copper mesh in 6mol / L HCl solution for 10 minutes, wash with deionized water, and dry spare;

[0022] (2) Add 0.57g of stearic acid to 100mL of absolute ethanol, put it into the copper mesh treated in step (1) after dissolving, and react at room temperature for 48h; take out the omentum, rinse the residual solution on the surface with absolute ethanol, and naturally Dry to obtain the super-hydrophobic oil-water separation omentum.

[0023] The surface topography scanning electron microscope photo of the superhydrophobic oil-water separation omentum prepared in the present embodiment is as follows figure 1 shown;

[0024] It is 159 ° (as figure 2 shown);

[0025] use image 3 The experimental device shown is used for separation experiments on the superhydrophobic oil-water separation membrane prepared in this example. The oil-w...

Embodiment 2

[0027] (1) Ultrasonic cleaning of foamed nickel with a 0.2 mm aperture for 15 minutes with acetone, ethanol and deionized water respectively to remove surface oil stains, then ultrasonic cleaning of foamed nickel in 4mol / L HCl solution for 15 minutes, followed by deionized water cleaning, drying spare;

[0028] (2) Add 0.69g of myristic acid to 60mL of absolute ethanol, put it into the nickel foam treated in step (1) after dissolving, and react at room temperature for 24h; take out the omentum, rinse the residual solution on the surface with absolute ethanol, and naturally Dry to obtain the super-hydrophobic oil-water separation omentum.

[0029] The contact angle of the superhydrophobic oil-water separation omentum prepared in this embodiment to 5 μL water droplets is greater than 150° in air;

[0030] use image 3 The experimental device shown is used for separation experiments on the superhydrophobic oil-water separation membrane prepared in this example. Fix the oil-wat...

Embodiment 3

[0032] (1) Ultrasonic cleaning of foam iron with a 0.1 mm pore diameter for 15 minutes with acetone, ethanol and deionized water respectively to remove surface oil stains, then ultrasonic cleaning of foam iron in 3mol / L HCl solution for 25 minutes, and deionized water cleaning, drying spare;

[0033] (2) Add 1.28g of palmitic acid into 50mL of absolute ethanol, put it into the iron foam treated in step (1) after dissolving, and react at room temperature for 12h; take out the omentum, rinse the residual solution on the surface with absolute ethanol, and naturally Dry to obtain the super-hydrophobic oil-water separation omentum.

[0034] The contact angle of the superhydrophobic oil-water separation omentum prepared in this embodiment to 5 μL water droplets is greater than 150° in air;

[0035] use image 3 The experimental device shown is used for separation experiments on the superhydrophobic oil-water separation membrane prepared in this example. Fix the oil-water separati...

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Abstract

The invention belongs to the field of surface modification of solid materials, and particularly relates to a method for preparing a super-hydrophobic oil-water separation mesh membrane in one step. The method comprises the following steps of: putting a pretreated metal mesh membrane into a long-chain alkyl acid ethanol solution, taking out the mesh membrane after reaction at room temperature, cleaning and drying in air to obtain the superhydrophobic oil-water separation mesh membrane. According to the method, the construction of a micro-nano hierarchical structure and the superhydrophobic modification on the surface of the mesh membrane are combined in the same reaction system, the material is cheap and easy to obtain, other strong corrosive, strong redox reagents or toxic modifiers do notneed to be added, the preparation process of a superhydrophobic oil-water separation material is simplified, and the method is environment-friendly, and is suitable for large-scale production. The superhydrophobic oil-water separation mesh membrane has good chemical resistance and mechanical properties, can efficiently separate oily sewage with strongly acidic, strongly alkaline or highly salt components, can be freely cut, can be repeatedly used for many times, and is easy to clean and store.

Description

technical field [0001] The invention belongs to the field of surface modification of solid materials, and in particular relates to a method for preparing a superhydrophobic oil-water separation membrane in one step. Background technique [0002] With the continuous increase of oil exploitation and demand and the deepening of industrialization, it is of great significance to study oil-water separation technology to improve water quality and oil quality. A variety of oil-water separation technologies have been widely developed and researched, especially the oil-water separation based on the super-wetting interface between the material surface and the oil phase and water phase, has become an important way to promote the development of oil-water separation technology. In recent years, inspired by the superhydrophobic phenomenon in nature, researchers have designed a variety of new bionic superhydrophobic separation materials. This superhydrophobic / superoleophilic superwetting pr...

Claims

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Application Information

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IPC IPC(8): B01D17/022C02F1/40
CPCB01D17/0202C02F1/40
Inventor 刘娜赵修松冯红彬王超
Owner QINGDAO UNIV
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