A kind of controllable wettability copper foam and its preparation and multifunctional oil-water separation method
A copper foam and wettability technology, applied in the direction of nanotechnology, can solve the difficult separation of oil-water mixture and other problems, achieve excellent recycling characteristics, simple equipment, and low cost
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[0032] A preparation of copper foam with controllable wettability and a multifunctional and efficient oil-water separation method, the method comprising three steps of preparation of copper foam with controllable wettability, wettability regulation and multifunctional high-efficiency oil-water separation.
[0033] The preparation method of controllable wettability copper foam comprises the following steps:
[0034] (1) Pre-treatment of foamed copper: select a three-dimensional through-hole foamed copper with a thickness of 1-3 mm, and a pore size of 400-1500 μm, cut it into the required size, and use acetone and ethanol to clean it in a 100W ultrasonic environment for 10 minutes. After blowing dry with nitrogen, immerse in 1mol / L hydrochloric acid aqueous solution for 3 minutes to remove the oxide film on the surface and activate the surface of foamed copper tendons. After taking it out, wash it with dilute alkali solution and deionized water, and dry it with nitrogen;
[0035...
Embodiment 1
[0042] A copper foam with a thickness of 1 mm and a pore size of 450 μm was selected as the anode, cleaned with acetone and ethanol in an ultrasonic environment of 100 W power for 10 min, blown dry with nitrogen, and immersed in 1 mol / L hydrochloric acid aqueous solution for 3 min to remove the oxide film on the surface, and Activate the surface of the foamed copper tendon, take it out, wash it with dilute alkali solution and deionized water, and dry it with nitrogen. The treated and activated foamed copper is used as the anode, and the pure copper sheet of the same size is used as the cathode, inserted into an aqueous solution of NaOH with a concentration of 0.3mol / L, and electrochemically oxidized at room temperature for 10min, with a distance between two electrodes of 5cm and a current density of 5mA / cm 2 , Rinse with clean water after taking it out and place it in a 60°C oven for 1.5h.
[0043] Through the above electrochemical oxidation reaction, a “fluffy” copper hydro...
Embodiment 2
[0045] Copper foam with a thickness of 2 mm and a pore diameter of 590 μm was selected as the anode, and the pretreatment process was the same as that of Example 1. It was inserted into an aqueous solution of NaOH with a concentration of 1.5 mol / L, and electrochemically oxidized at room temperature for 20 min. The distance between the two electrodes was 5 cm, and the current density was 6.2 mA. / cm 2 , Rinse with clean water after taking it out and put it in an oven at 73°C for 1h. The wettability and oil-water separation properties of the obtained copper foam are similar to Example 1, and when water and oily substances are dropped on the surface, they can be quickly and completely absorbed. Slowly drop or pour deionized water onto the copper foam until it is completely wetted. At this time, the copper foam has oleophobic properties, and the oily liquid is hemispherical on its surface, with a contact angle of 100-140°. Similarly, after the oily liquid is dripped on the treate...
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