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Preparation method of a superhydrophilic underwater superoleophobic oil-water separation net

An underwater superoleophobic and oil-water separation mesh technology, which is applied in the field of preparation of oil-water separation mesh membranes, can solve the problems of flux attenuation, poor usability, secondary pollution, etc., and achieves a simple preparation process, easy cleaning, and no toxic and harmful effects. effects of matter

Active Publication Date: 2020-11-27
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For superhydrophobic and superoleophilic membranes, due to the potential lipophilicity of the membrane, oil droplets and other impurities are easily and irreversibly adsorbed on the surface of the superoleophilic membrane, causing membrane fouling, resulting in rapid attenuation of flux, and emulsified oil droplets are easy to be deposited on the membrane during cleaning. The surface coalesces and spreads, resulting in poor long-term reusability and secondary pollution of the membrane

Method used

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  • Preparation method of a superhydrophilic underwater superoleophobic oil-water separation net
  • Preparation method of a superhydrophilic underwater superoleophobic oil-water separation net
  • Preparation method of a superhydrophilic underwater superoleophobic oil-water separation net

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Effect test

Embodiment 1

[0027] (1) Pretreatment of the substrate: ultrasonically clean the 1000-mesh stainless steel mesh in ethanol and deionized water for 10 minutes, then dry it for later use;

[0028] (2) Preparation of reaction solution: Dissolve 0.346g of lanthanum nitrate hexahydrate in 20 ml of deionized water to form a 40 mmol / L lanthanum nitrate solution, then add 10 ml of 0.24 mol / L urea to adjust the pH to 2;

[0029] (3) The preparation process of the film layer: immerse the stainless steel mesh in (1) into the high-pressure reactor added with the reaction solution (2), keep it at 80°C for 20 hours, cool it down to room temperature naturally, take it out and blow dry at 550°C Annealed for 120 min.

Embodiment 2

[0031] (1) Pretreatment of the substrate: Ultrasonic cleaning of 800-mesh stainless steel mesh in ethanol and deionized water for 10 minutes, and then dried for later use;

[0032] (2) Preparation of reaction solution: Dissolve 0.087 g of lanthanum nitrate hexahydrate in 20 ml of deionized water to form a 10 mmol / L lanthanum nitrate solution, then add 10 ml of 0.10 mol / L urea to adjust the pH to 7;

[0033] (3) The preparation process of the film layer: immerse the stainless steel mesh in (1) into the high-pressure reactor added with the reaction solution (2), keep it at 100°C for 12 hours, cool it down to room temperature naturally, take it out and blow dry at 550°C Annealed for 100 min.

Embodiment 3

[0035] (1) Pretreatment of the substrate: ultrasonically clean the 400-mesh stainless steel mesh in ethanol and deionized water for 10 minutes, and then blow dry;

[0036] (2) Preparation of reaction solution: Dissolve 0.130 g of lanthanum nitrate hexahydrate in 20 ml of deionized water to form a 15 mmol / L lanthanum nitrate solution, then add 10 ml of 0.30 mol / L urea to adjust the pH to 3;

[0037] (3) The preparation process of the film layer: immerse the stainless steel mesh in (1) into the high-pressure reactor added with the reaction solution (2), keep it at 160°C for 5 hours, cool it down to room temperature naturally, take it out and dry it, and heat it at 550°C. ℃ annealing for 100 min to prepare lanthanum oxycarbonate (La 2 o 2 CO 3 ) micro-nanostructures (such as image 3 shown), the obtained oil-water separation mesh has a pore size of about 40 μm (as shown in figure 1 and figure 2 shown).

[0038] (4) The prepared oil-water separator has a contact angle of 0°...

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Abstract

The invention belongs to the technical field of surface functionalization modification of materials, and particularly relates to a method for manufacturing an oil-water separation net membrane with super-hydrophilic underwater super-oleophobic property. According to the method, a (400-1800)-mesh stainless steel wire mesh serves as a base, a micro-nanostructure lanthanum carbonate (La2O2CO3) whichhas hydrophilic property is formed on the stainless steel wire mesh using a hydrothermal method, and finally annealing treatment is carried out at 550 DEG C to obtain the stainless steel wire mesh with the super-hydrophilic underwater super-oleophobic property. The method is simple to operate, has readily available materials, can be used for separation of oil-water mixtures, can be reused, and does not cause secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of material surface functional modification, and in particular relates to a preparation method and application of an oil-water separation omentum with superhydrophilic underwater superoleophobic properties. Background technique [0002] In industries such as petroleum, chemical industry, steel, coking, home appliances, machinery manufacturing and food processing, all water that comes into direct contact with oil contains oil. According to investigations and studies, about 3.2 billion tons of oil enters water bodies every year worldwide to form oily wastewater. A large amount of oily wastewater has caused great harm to the environment and has become a major challenge to the environment. The traditional methods commonly used in the treatment of oily wastewater mainly include gravity method, centrifugation method, air flotation method, adsorption method, chemical method, biological method and membrane separatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00B01D17/022
CPCB01D17/02B01D67/0039B01D69/02B01D71/022B01D2325/36
Inventor 张跃忠刘宝胜王晓宇翟洪彪智丽飞王亚宁房大庆卫英慧
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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