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Preparation method and application of ultra-hydrophobic and ultra-lipophilic paper-based separating material

A separation material and super-hydrophobic technology, which is applied in the field of preparation of hydrophobic and lipophilic paper-based separation materials, can solve problems such as instability and separation that have not been reported, and achieve the effect of less environmental pollution

Inactive Publication Date: 2011-10-26
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of polymers to adhere nanoparticles to the surface of filter paper, it is unstable in some organic solutions.
Low-viscosity n-hexane, toluene and other solutions can pass through superhydrophobic filter paper quickly, but there is no report on the separation of high-viscosity oils

Method used

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  • Preparation method and application of ultra-hydrophobic and ultra-lipophilic paper-based separating material
  • Preparation method and application of ultra-hydrophobic and ultra-lipophilic paper-based separating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of nanoparticles: prepare silicon dioxide nanoparticles according to the prior art, use 40mL ethanol as solvent, take 4.18mL tetraethyl orthosilicate as precursor, add 1.4mL concentrated ammonia water to prepare nanoparticle sol solution;

[0016] (2) Modification of nanoparticles: according to the volume ratio: nanoparticle sol solution: ethanol: trimethylmethoxysilane: ethyl orthosilicate=10: 5: 0.5: 0.75 mixing and stirring; dropwise add 0.6 volumes of Concentrated hydrochloric acid, stirred at room temperature for 15-20 hours;

[0017] (3) Filter paper modification: Pour the modified nanoparticle solution into a container, soak the filter paper in the solution for 10-20 seconds, let the gaps in the filter paper be filled with the sol solution, take it out and dry it naturally to obtain super hydrophobic and lipophilic filter paper;

[0018] (4) The particle size of the prepared nanoparticles is about 29~34nm, and the static water contact angle is 15...

Embodiment 2

[0024] (1) Preparation of nanoparticle sol solution: 40 mL of ethanol was used as a solvent, 4.18 mL of tetraethyl orthosilicate was used as a precursor, and 1.2 mL of concentrated ammonia water was added to prepare a nanoparticle sol solution;

[0025] (2) Modification of nanoparticles: according to the volume ratio: nanoparticle sol solution: ethanol: methyltrimethoxysilane: ethyl orthosilicate = 10:5:0.5:0.75 mixing and stirring; dropwise add 0.6 volume of concentrated Hydrochloric acid, stirred at room temperature for 15-20 hours;

[0026] (3) Filter paper modification: Pour the modified nanoparticle solution into a container, soak the filter paper in the solution for 10-20 seconds, let the gaps of the filter paper be filled with the sol solution, take it out and dry it naturally to obtain superhydrophobic and lipophilic filter paper.

Embodiment 3

[0028] (1) Preparation of nanoparticles: Silica nanoparticles were prepared according to the prior art, using 40mL of ethanol as a solvent, 4.18mL of ethyl orthosilicate as a precursor, and adding 1.6mL of concentrated ammonia water to prepare a nanoparticle sol solution;

[0029] (2) Modification of nanoparticles: According to the volume ratio: nanoparticle sol solution: ethanol: ethyltrimethoxysilane: ethyl orthosilicate = 10:5:0.5:0.75 mixing and stirring; dropwise add 0.6 volume of concentrated Hydrochloric acid, stirred at room temperature for 15-20 hours;

[0030] (3) Filter paper modification: Pour the modified nanoparticle solution into a container, soak the filter paper in the solution for 10-20 seconds, let the gaps in the filter paper be filled with the sol solution, take it out and dry it naturally to obtain super hydrophobic and lipophilic filter paper.

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Abstract

The invention relates to a preparation method and an application of an ultra-hydrophobic and ultra-lipophilic paper-based separating material. The preparation method comprises that: (1) a sol solution of silicon dioxide nano-particles with a particle size of 24 to 36nm is prepared with existing technologies; (2) the solution is modified with a silanizing reagent; (3) a piece of filter paper is immersed in the modified nano-particle solution for 10 to 20 seconds, and is naturally dried, such that an ultra-hydrophobic and ultra-lipophilic paper-based separating material is obtained. The surfaceof the material possesses micron-sized apertures. The contact angle between the separating material and the water surface is larger than 150 DEG. The material has a good ultra-hydrophobic performance, and is acid resistant and organic solvent resistant. The material can be used repeatedly, and can be used for absorbing oil stains floated on water surfaces. The material brings an excellent separating effect to oil-water mixtures, especially oil-water emulsion with high viscosity, and has wide application prospect in industrial oil-water separation and water area oil stain cleaning. According to the present invention, the preparation technology is simple, the requirement for equipment is low, the preparation condition is not restricted by region differences, and mass industrial production can be realized easily.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method and application of a hydrophobic and lipophilic paper-based separation material. Background technique [0002] The measurement of the contact angle between a solid surface and a water droplet is a direct physical parameter for judging wettability. When the contact angle is greater than 150°, the solid surface is considered to be in a superhydrophobic state. To make the solid surface superhydrophobic, two conditions must be met at the same time: (1) surface with nano-micron rough structure; (2) low surface free energy. These two conditions make the water droplets meet the Cassie model when they contact the solid surface to form a superhydrophobic surface. Superhydrophobic surfaces have three main properties: (1) anti-adhesion; (2) anti-pollution; (3) self-cleaning. Because of these properties, superhydrophobic surfaces are widely used in industrial pro...

Claims

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Application Information

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IPC IPC(8): B01D39/00B01D17/022
Inventor 陈波周聪
Owner HUNAN NORMAL UNIVERSITY
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