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A method for coating nanomaterials on the surface of underwater oleophobic omentum
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A technology of nanomaterials and omentum, which is applied in the direction of separation methods, chemical instruments and methods, grease/oily substances/suspton removal devices, etc., can solve the problems of easy pollution of the membrane surface, cumbersome preparation process, and short service life, and achieve Effect of increasing surface hydrophilicity, reducing cost, and strong corrosion resistance
Inactive Publication Date: 2017-03-01
JIANGSU UNIV
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[0004] Aiming at the shortcomings of existing coating methods in the prior art, such as cumbersome preparation process, high cost, easy pollution of the surface of the obtained membrane, and short service life, the present invention provides an underwater oleophobic coating with simple operation and low cost. A method of coating nanomaterials on the surface of the omentum. The underwater oleophobic omentum prepared by this coating method has good oil-water separation effect, long service life, and has an inhibitory effect on E. coli.
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Embodiment 1
[0030] (1) Cleaning of the omentum: Select a stainless steel mesh membrane with a mesh number of 80, soak it in acetone and ultrasonically clean it for 5 minutes, take it out for rinsing, put it in anhydrous ethanol for ultrasonic cleaning for 5 minutes, take it out and rinse it, and put it in deionized water for ultrasonic cleaning Wash for 5 minutes, dry in an oven at 60°C for 12 hours and set aside;
[0031] (2) Chemical etching of omentum: soak the cleaned stainless steel mesh membrane in 0.2mol / L (CuCl 2 ) 2 ·H 2 O solution for 3 minutes, take it out and ultrasonically clean it in distilled water for 30 minutes, and then dry it in an oven at 90°C for 1 hour before use;
[0032] (3) Chemical modification of the omentum: immerse it in 2 mg / mL polydimethyldiallyl ammonium chloride (PDDA) solution for 10 minutes, take it out, rinse it with deionized water, and dry it with nitrogen flow to obtain the modified omentum. Non-toxic stainless steel mesh membrane;
[0033] (4) C...
Embodiment 2
[0040](1) Cleaning of omentum: Select stainless steel mesh membrane with 100 meshes, soak it in acetone and ultrasonically clean it for 5 minutes, take it out and rinse it, put it in absolute ethanol for ultrasonic cleaning for 5 minutes, take it out and rinse it, put it in deionized water Ultrasonic cleaning for 5 minutes, drying in an oven at 60°C for 12 hours for use;
[0041] (2) Chemical etching of the omentum: Soak the cleaned stainless steel wire mesh in the mixed solution (3mL of phosphoric acid, hydrochloric acid and hydrogen peroxide, add 12g of ferric chloride in 45mL of deionized water), take it out after 5min Ultrasonic cleaning in distilled water for 30 minutes, and then drying in an oven at 60°C for 1 hour for use;
[0042] (3) Chemical modification of the omentum: then immerse it in a 5 mg / mL polyetherimide (PEI) solution for 15 minutes, take it out, rinse it with deionized water, and dry it with nitrogen flow to obtain a modified stainless steel mesh membrane ...
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Abstract
The invention provides a method for coating the surface of an underwater oleophobic net film with a nano-material. The method comprises the following steps of carrying out chemical etching on a cleaned and dried stainless wire net film by a chemical etching agent, carrying out ultrasonic cleaning and drying, immersing the stainless wire net film in a cation precipitating agent solution so that chemical modification is realized, taking out the stainless wire net film, carrying out washing by deionized water, carrying out blow-drying by a nitrogen flow, immersing the stainless wire net film in a silicon dioxide dispersion liquid of graphene oxide so that a coating process is realized, taking out the treated stainless wire net film, carrying out washing by deionized water, repeating chemical modification-coating processes multiple times to obtain a coated stainless wire net film, carrying out drying, carrying out calcination at a temperature of 500-550 DEG C in a nitrogen protective atmosphere for 3-4h and carrying out cooling to obtain the stainless wire net film finished product. The method is carried out at a normal temperature, has simple processes and a low cost, utilizes an etching agent and a modified agent with low environment pollution and does not cause secondary pollution. The stainless wire net film has strong corrosion resistance, substantial oil-water separation effects, a long service life and good escherichia coli inhibition effects.
Description
technical field [0001] The invention belongs to the technical field of omentum separation of oily wastewater, and in particular relates to a method for coating the surface of an underwater oleophobic omentum with nanomaterials, which is used for oil-water separation and advanced treatment of oily wastewater. Background technique [0002] In the treatment of oily wastewater, commonly used methods include gravity separation, ultrasonic separation, coagulation, and membrane separation. Among them, membrane separation technology is more effective in oil-water separation, but the problem of membrane fouling caused by membrane separation is seriously reduced. membrane life. Nowadays, the underwater super-oleophobic membrane with special wettability coating can separate the oil and water in the oil-water mixture according to the wettability of water and oil on its surface. Oil-water separation tool. [0003] The metal-based omentum can achieve advanced treatment of oily wastewate...
Claims
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