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Preparation method of oil and water separating membrane with underwater super-oleophobic property and antibacterial property

An underwater superoleophobic, oil-water separation membrane technology, applied in separation methods, chemical instruments and methods, liquid separation, etc. Not high enough, poor oil resistance and adhesion, etc., to achieve the effects of excellent superoleophobic properties, excellent antibacterial properties, and fast separation speed

Active Publication Date: 2018-07-13
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of these materials is relatively complicated, and they do not have superhydrophilic / underwater superoleophobic properties, the separation efficiency and separation selectivity are not high enough, and the oil resistance and adhesion are poor

Method used

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  • Preparation method of oil and water separating membrane with underwater super-oleophobic property and antibacterial property
  • Preparation method of oil and water separating membrane with underwater super-oleophobic property and antibacterial property
  • Preparation method of oil and water separating membrane with underwater super-oleophobic property and antibacterial property

Examples

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Effect test

Embodiment 1

[0037] A method for preparing an oil-water separation membrane with underwater superoleophobic properties and antibacterial properties, comprising the steps of:

[0038] 1) At room temperature, add 100ml of water and 3g of sodium alginate into a 250ml beaker, stir and mix evenly to obtain a 3wt% sodium alginate solution, and scrape the resulting sodium alginate solution on a glass plate, with a film thickness of about 70 μm;

[0039] 2) Grind sodium chloride, sieve with a standard sieve, take 3 g of sodium chloride crystal particles with a particle diameter of about 300 μm for use, and sieve the sodium chloride crystal particles on the surface of the sodium alginate film obtained in step 1) , to get a mixed film;

[0040] 3) Immediately put the mixed film obtained in step 2) into a 5wt% calcium chloride solution for ultrasonication for 60s, and then soak the obtained initially cured film in a 5wt% calcium chloride solution for 6 hours to make it fully cross-linked, and use Wa...

Embodiment 2

[0048] A method for preparing an oil-water separation membrane with underwater superoleophobic properties and antibacterial properties, comprising the steps of:

[0049] 1) At room temperature, add 100ml of water and 0.5g of sodium alginate into a 250ml beaker, stir and mix evenly to obtain a 0.5wt% sodium alginate solution, and scrape the resulting sodium alginate solution on a glass plate, with a film thickness of about 20 μm;

[0050] 2) Grind sodium chloride, sieve with a standard sieve, take 0.05 g of potassium sulfate crystal particles with a particle diameter of about 20 μm for use, and sieve the sodium chloride crystal particles with a sieve on the surface of the sodium alginate film obtained in step 1) , to get a mixed film;

[0051] 3) Immediately put the mixed membrane obtained in step 2) into 0.01wt% ferric chloride solution for 30s, and then soak the obtained preliminarily cured membrane in 0.01wt% ferric chloride solution for 12h to make it fully cross-linked , ...

Embodiment 3

[0059] A method for preparing an oil-water separation membrane with underwater superoleophobic properties and antibacterial properties, comprising the steps of:

[0060] 1) At room temperature, add 100ml of water and 10g of sodium alginate into a 250ml beaker, stir and mix evenly to obtain a 10wt% sodium alginate solution, and scrape the resulting sodium alginate solution on a glass plate, with a film thickness of about 200 μm;

[0061] 2) Grind sodium sulfate, sieve with a standard sieve, take 20 g of sodium sulfate crystal particles with a particle diameter of about 500 μm for use, sieve the sodium sulfate crystal particles on the surface of the sodium alginate film obtained in step 1) with a sieve, and mix membrane;

[0062] 3) Immediately put the mixed film obtained in step 2) into a 10wt% hydrochloric acid solution for 180s, and then soak the obtained initially cured film in a 10wt% hydrochloric acid solution for 0.1h to fully cross-link it, and wash it with deionized wat...

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Abstract

The invention relates to a preparation method of an oil and water separating membrane with underwater super-oleophobic property and antibacterial property. The preparation method comprises the following steps of dissolving sodium alginate into water, so as to obtain a sodium alginate solution; coating the sodium alginate solution with membrane, and screening water-soluble salt with certain particle size into the sodium alginate solution coated with the membrane, so as to obtain a mixed membrane; immediately oscillating the mixed membrane in a crosslinking agent water solution by ultrasonic waves, and soaking into a crosslinking agent, so as to obtain a sodium alginate porous membrane; sequentially soaking the sodium alginate porous membrane into a silver nitrate solution and a reductant solution, so as to obtain the oil and water separating membrane. The oil and water separating membrane obtained by the preparation method has the advantages that the contact angel with oil is 155 to 168degrees in water; by adopting silver cluster particles with micro-nano composite structures, the roughness of the membrane surface is enhanced, the underwater super-oleophobic property is more excellent, the easiness in sticking by oil is avoided, and the oil and water membrane is suitable for separating the oil and water mixture with larger separating viscosity.

Description

technical field [0001] The invention relates to a preparation method of an oil-water separation membrane, in particular to a preparation method of an oil-water separation membrane with underwater superoleophobic properties and antibacterial properties. Background technique [0002] With the massive discharge of oily sewage in production and life and the frequent occurrence of offshore oil spill accidents, oil-water separation has become an important research topic related to people's life, economic development and environmental safety. Since the separation of oil and water is a problem of interface science, it is a research hotspot at this stage to use the special wetting properties of materials to achieve efficient and selective separation of oil and water. [0003] Chinese patents CN1387932A, CN1721030A, CN101518695A and CN102698471B all disclose oil-water separation meshes or oil-water separation meshes with superhydrophobic and superlipophilic functions. The above-menti...

Claims

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Application Information

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IPC IPC(8): B01D71/08B01D71/02B01D69/12B01D67/00C02F1/40C02F1/44
CPCB01D67/0079B01D69/125B01D71/02B01D71/08B01D2325/36B01D2325/48C02F1/40C02F1/44
Inventor 薛众鑫张维邢小伟朱树旭陶倩
Owner LUDONG UNIVERSITY
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