Preparation method of nano-structure oil-water separation net membrane with self-cleaning and underwater super-oleophobic characteristics

Abstract

The invention discloses a preparation method of a metal net membrane with self-cleaning and underwater super-oleophobic characteristics. The metal net membrane can achieve efficient oil-water separation and self cleaning. A traditional oil-water separation membrane has the defects that a preparation technology is complex, regeneration is difficult, and repeated using can not be achieved. With a copper net being a substrate, an anodic oxidation method is adopted for generating a copper hydroxide nanowire array, multiple layers of titanium dioxide are deposited on the nanowire array through layer-by-layer self-assembly, and the copper net membrane covered by a copper oxide / titanium dioxide composite membrane layer is generated through roasting. The net membrane is high in mechanical performance and resistant to high heat, has the super-hydrophilic and underwater super-oleophobic characteristics, can efficiently separate an oil-water mixture and meanwhile can perform self cleaning under photocatalysis active illumination of the titanium dioxide layer to achieve regeneration and repeated using. Compared with the preparation technology of the existing oil-water separation membrane, the method facilitates scale expansion, preparation is easy, raw materials are environmentally friendly, the cost is low, cyclic reuse can be achieved, and the net membrane is a novel oil-water separation net membrane which is more environmentally friendly and affordable.

Description

technical field [0001] The invention relates to the field of oil-water separation in chemical process, specifically a method for preparing a copper mesh-based composite film layer covering copper oxide nanowire arrays loaded with titanium dioxide, so that it has both self-cleaning and high-efficiency oil-water separation functions. . Background technique [0002] The development of petroleum industry, machinery industry, catering industry and marine transportation industry will produce oily wastewater, which will enter the water body and cause pollution. According to statistics, 5 to 10 million tons of oil flow into the ocean through various channels in the world every year. Because the density of oil is lower than that of water, the oil layer floats on the water surface, which prevents the diffusion of oxygen from the air to the water body, resulting in the lack of oxygen in the water body, affecting the growth of aquatic organisms, endangering aquatic resources, and furth...

AI Technical Summary

Problems solved by technology

Among them, the research on superhydrophobic inorganic membrane is relatively extensive, but because the oil phase flows through the membrane for a long time, it is very easy to cause the coalescence of oil molecules in the membrane and the flux decreases, and the oil in the membrane is difficult to remove, resulting in hydrophobic inorganic membrane. Omentum cannot be reused, increasing disposal costs

In recent years, hydrophilic inorganic membranes have attracted more and more attention from researchers because of their better oil-water separation efficiency and stability, but no relevant patents have been reported

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