With the development of the economy and the progress of industrialization, the problem of water pollution has become more and more serious. Crude oil leakage at sea, petroleum industry wastewater,...

Collecting water in fog has also become a breakthrough to solve the hidden danger of water shortage in some arid areas. The three-dimensional (3D) structure fog collection material can increase the surface area in direct contact with the fog flow and reduce the quick flow of fog, which can effectively improve the fog collection efficiency. Imitating the three-dimensional structure of corrugated paper, the 3D fog collecting material with hybrid wettability was prepared by chemical and physical means. We discuss the influence of different wettability combinations on the fog collection efficiency of 3D structures and study the influence of spraying times and illumination times on the surface wettability during the construction of wettability. We also study the influence of the concavity and tip as well as the bending angle on the fog collection in the 3D structure and obtain the most reasonable concavity and convex ratio and bending angle. The superhydrophilic and superhydrophobic 3D structure fog harvesting material prepared by us performs well in the fog harvesting process, and the fog harvesting efficiency reaches 1.442 g cm −2 h −1 . The fog collection efficiency is 418% of the original zinc sheet. At the same time, compared with the superhydrophilic and superhydrophobic hybrid twodimensional (2D) plane, the increase is 168%, and compared with the superhydrophobic 3D structure, the increase is 150%.

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By etching copper mesh with ammonia-base and depositing titanium dioxide nanoparticles (TiO2 NPs) on it, nanoneedle-like Cu(OH)2 was formed, and then modified with n-hexadecyltrimethoxysilane (HDTMS) to achieve superhydrophobicity/superoleophilicity for heavy oil-water mixtures separation. The method has the advantages of simple operation, high efficiency, good repeatability and worth in industrial applications.

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