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Preparation method of durable super-hydrophobic super-oleophylic foamy copper for oil and water separation

A technology of oil-water separation and copper foam, which is applied in the direction of separation methods, liquid separation, chemical instruments and methods, etc., can solve problems such as shedding, affecting the long-lasting oil-water separation and circulation separation characteristics of foam copper, and being easily damaged, so as to increase the combination force, increase thickness, and increase oil absorption

Active Publication Date: 2015-09-09
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, it should be pointed out that the rough structure constructed on the surface of the copper foam skeleton in the prior art is easily damaged or even falls off due to the erosion of liquid or particles and the action of liquid capillary force, thus affecting the long-lasting oil-water separation and circulation of the foam copper. Separation properties

Method used

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  • Preparation method of durable super-hydrophobic super-oleophylic foamy copper for oil and water separation
  • Preparation method of durable super-hydrophobic super-oleophylic foamy copper for oil and water separation
  • Preparation method of durable super-hydrophobic super-oleophylic foamy copper for oil and water separation

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preparation example Construction

[0036] A method for preparing durable super-hydrophobic super-oleophilic copper foam for oil-water separation, said method comprising the steps of:

[0037] (1) Foamed copper pretreatment: Put the foamed copper with a pore size of 400-1500 μm into ethanol and acetone solution in turn, ultrasonically clean it for 10 minutes, take it out and then put it in 2mol / L hydrochloric acid aqueous solution for 10 minutes to remove oil and scale and finally use it Rinse with deionized water repeatedly and dry for later use;

[0038] (2) Pre-roughening of the foamed copper skeleton: chemical etching or electrochemical deposition or a combination of the two methods are used to pre-roughen the foamed copper skeleton; the chemical etching method is to remove oil and descale the foam Copper is put into 2-5mol / L nitric acid aqueous solution, and etched at room temperature for 1-2h. The electrochemical deposition method uses foamed copper as the cathode, and pure copper sheets of the same size a...

Embodiment 1

[0042] Copper foam with a pore size of 400 μm (such as figure 1 shown) into ethanol and acetone solutions in turn, ultrasonically cleaned for 10 minutes, and then put into 2mol / L hydrochloric acid aqueous solution for 10 minutes to remove oil and scale, and finally rinsed repeatedly with deionized water and dried for later use. Put the degreased and descaled copper foam into 2mol / L nitric acid aqueous solution, and etch at room temperature for 2 hours to obtain a rough copper foam skeleton. Subsequently, a ZnO seed layer was obtained on the surface of the skeleton by an immersion pulling-sintering method, and then a dense ZnO array nanostructure was grown by a chemical bath method. After 3 minutes, the ZnO precursor sol was pulled out at a speed of 1mm / s, blown with hot air at 60°C for 30s, and then blown with cold air at 20°C for 3 minutes until the foamed copper was completely dry, and then repeatedly dipped and pulled up and down for 3 times. Then vacuum reaction at 350° C...

Embodiment 2

[0044] Put copper foam with a pore size of 600 μm into ethanol and acetone solutions in turn, ultrasonically clean it for 10 minutes, take it out and put it in 2mol / L hydrochloric acid aqueous solution for 10 minutes to remove oil and scale, and finally rinse it repeatedly with deionized water and dry it for later use. Copper foam is used as the cathode, and pure copper sheets of the same size are used as the double anode, the distance between the two poles is 5cm, and 0.2mol / L CuSO 4 and 1.5mol / L H 2 SO 4 The mixed aqueous solution is the electrolyte solution, adding 5g / L sodium dodecylbenzenesulfonate as a wetting agent, at room temperature, 800r / min magnetic sub-stirring, first at a current density of 0.005A / cm 2 Under the conditions of electrodeposition for 5min, and then at 0.01A / cm 2 Electrodeposition at current density for 5min, finally at 0.02A / cm 2 Electrodeposition at current density for 5 min. The original smooth foam copper skeleton ( figure 2 ), after the el...

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Abstract

The invention provides a preparation method of durable super-hydrophobic super-oleophylic foamy copper for oil and water separation. The preparation method comprises the followings steps: firstly, the foamy copper is sequentially put in an ethanol solution and an acetone solution for ultrasonic cleaning and treated with a hydrochloric acid aqueous solution to remove oil stain and oxide skin; for the cleaned foamy copper, a chemical etching or electrochemical deposition method is used to pre-roughen a foamy copper framework so as to improve the membrane-based binding force; then, a dip-coating-sintering method is adopted to obtain a ZnO crystal seed layer on the surface of the framework, and a compact ZnO array nano structure grows in an oriented manner through a chemical bath manner so as to improve the strength and stability of a film layer; finally, fluoridation is performed on the foamy copper to realize the super-hydrophobic super-oleophylic feature and the oil and water separation function. Through the pre-roughening of the foamy copper framework and the compactly arranged zinc oxide nano structure, the strength of the film layer and the membrane-based binding force can be improved, and the damaging and falling behavior of the film layer during oil and water separation by the foamy copper can be reduced, so that the durable oil and water separation capacity of the foamy copper can be improved.

Description

technical field [0001] The invention relates to a method for preparing durable superhydrophobic and superoleophilic copper foam used for oil-water separation. Background technique [0002] Oily sewage mainly comes from the process of oil extraction, refining, oil storage, transportation and other processes in the petroleum industry, as well as mechanical metallurgical manufacturing industry, steam turbine lubrication system, ship transportation, textile light industry, catering industry, etc. Although oily sewage is commonplace, its hazards cannot be underestimated. Some carcinogenic low-boiling aromatic hydrocarbons in petroleum, if eaten by aquatic animals and plants such as fish and shellfish, will endanger human health through the food chain and lead to an increase in the incidence of human cancer. Due to the emulsification of the lubricating oil in the steam turbine unit, the high-pressure oil film between the rotor journal and the bearing bush is destroyed, dry fricti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022C25D7/04C25D5/34C23F1/02C23C18/12
Inventor 张友法章雯余新泉高琳
Owner SOUTHEAST UNIV
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