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Chemically stable low-oil-adhesiveness oil-water separating member, and making method and use thereof

A low oil adhesion, oil-water separation membrane technology, applied in separation methods, chemical instruments and methods, liquid separation, etc. Contamination and other problems, to achieve fast and efficient separation performance, strong anti-swelling and corrosion, low cost effect

Active Publication Date: 2014-08-13
SUZHOU BINARY CENTURY NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials also have some problems while achieving the effect of oil-water separation: if it is necessary to introduce fluorine-containing materials in the preparation process, the loss of fluorine during use will easily cause secondary pollution to the environment; and, super oleophobic in the air The shortcomings of the materials in the actual aqueous system are easy to lose their oleophobic properties. These problems limit the use of such super-hydrophobic and super-oleophilic materials in the field of separation of oily sewage.
Literature Adv. Mater., 2011, 23, 4270 and CN102029079A reported the preparation of superhydrophilic and underwater superoleophobic by coating superhydrophilic hydrogel on the omentum substrate. Oil-water separation membrane, but organic polymer materials have poor chemical and thermal stability, so the separation in harsh environments is limited

Method used

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  • Chemically stable low-oil-adhesiveness oil-water separating member, and making method and use thereof
  • Chemically stable low-oil-adhesiveness oil-water separating member, and making method and use thereof
  • Chemically stable low-oil-adhesiveness oil-water separating member, and making method and use thereof

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preparation example Construction

[0042] More specifically, the preparation method of the present invention includes: taking the aforementioned substrate precursor as the substrate, adopting a method of etching in a high-concentration alkaline solution, and adjusting the temperature of the reaction system and the oxidation time, so that on the aforementioned substrate precursor, For example, an oil-water separation membrane with an inorganic nanosheet structure of a metal oxide or hydroxide with a rough micro / nano structure surface is prepared on a metal grid or a foam material support.

[0043] In a typical embodiment, the preparation method of the oil-water separation membrane comprises:

[0044] A substrate precursor with a plurality of through holes is provided, wherein at least the surface layer of the substrate precursor and the walls of the through holes are covered with a material layer mainly composed of iron, and the diameter of the through holes is 100-2000 head,

[0045] taking the substrate precu...

Embodiment 1

[0059] (1) The 250-mesh stainless steel mesh was immersed in deionized water and ethanol for ultrasonic cleaning, then washed with deionized water and dried naturally.

[0060] (2) At room temperature, add 100mL of water, 3g of sodium hydroxide and 0.96g of potassium persulfate into a 150mL beaker, mix evenly with magnetic stirring, prepare a uniform aqueous solution, and raise the temperature to 70°C for later use.

[0061] (3) Soak the pre-cleaned stainless steel in step (1) in the solution to react, and the reaction time is 3 hours, thereby forming iron oxide nanosheets coated with metal mesh on the surface of the metal mesh, the height of the nanosheet is about 100 Nano, width is about 100 nanometers, take out the omentum after the reaction is completed, wash it repeatedly with deionized water, and dry it naturally in the air to obtain super hydrophilic in the air environment and underwater and super hydrophilic in the underwater Oleophobic oil-water separation membrane, t...

Embodiment 2

[0066] (1) The 500-mesh stainless steel mesh was immersed in deionized water and ethanol for ultrasonic cleaning, then washed with deionized water and dried naturally.

[0067] (2) At room temperature, add 100mL of water, 2.7g of potassium hydroxide and 4.32g of ammonium persulfate into a 150mL beaker, stir evenly with magnetic force, prepare a uniform aqueous solution, and raise the temperature to 50°C for later use.

[0068] (3) Soak the pre-cleaned stainless steel mesh in step (1) in the solution to react. The reaction time is 6 hours, thereby forming iron oxide nanosheets coated with metal mesh on the surface of the metal mesh. The height of the nanosheets is about 300 nanometers and a width of about 300 nanometers. The omentum after the reaction is taken out, washed repeatedly with deionized water, and dried naturally in the air. An oil-water separation membrane with superoleophobic properties, the membrane has a pore size of about 10-20 microns, and its surface appearanc...

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Abstract

The invention discloses a chemically stable low-oil-adhesiveness oil-water separating member, and a making method and a use thereof. The separating member comprises a substrate having a plurality of through holes with the aperture of 100-2000 meshes, and nanometer laminas at least growing on the surface layer of the substrate and the walls of the thorough holes in an in-situ manner, each of the nanometer laminas is composed of a plurality of metal hydroxides and / or metal oxide nano / micro sheets, and the vertical height and the transverse width of the nano / micro sheets are 20nm-2mum and 100-2000nm respectively. The separating member can be made through a strong electrolyte environment induced oxidation ethod. The separating membrane has the characteristics of super hydrophilicity, underwater super oleophobicity and low oil adhesiveness, can be used for purifying oil-water mixtures, such as industrial or domestic sewage, can separate and remove oil drops dispersed in water, and has the advantages of efficient and rapid separation, no need of outside force driving, easy cleaning, good contamination resistance, simple preparation technology, wide material sources, low cost, easy realization of the large scale production, and adaptation to the industrial application.

Description

technical field [0001] The invention belongs to the fields of chemical engineering, functional materials and nanotechnology, and in particular relates to the preparation and application of a separation membrane with super-hydrophilic and underwater ultra-low oil adhesion properties. Background technique [0002] The discharge of oily sewage in production and life has caused increasingly serious pollution to water bodies. The sewage discharged in production and life mainly includes oily sewage and watery waste oil. Therefore, the separation of oil and water has a wide range of applications in social production and people's daily life. Application requirements. A large number of studies have reported the use of super-lipophilic and super-hydrophobic materials to prepare oil-water separation materials, such as the literature Nanotechnology 2007, 18, 015103; ACS Appl. Mater. Interface, 2009, 1, 2613; Adv.Mater. , 2012, 2, 3666, etc. have all reported superhydrophobic superoleo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022
Inventor 靳健刘霞张丰张忠义
Owner SUZHOU BINARY CENTURY NANO TECH
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