On the 5th, the reporter learned from Changsha University of Science and Technology that Sun Lidong, a professor at Chongqing University, Jia Chuankun, an expert in Hunan's 100-person plan, and Han Zheng, a researcher at the Institute of Metal Research, Chinese Academy of Sciences, jointly developed an international team with the Singapore Science and Technology Bureau's Institute of Chemistry and Engineering "Infiltration anodization" can achieve full coverage of super-hydrophilic coating in porous titanium three-dimensional microchannels with a pore size of 10-100 microns and a thickness of 1-5 mm, which can increase the penetration rate of water droplets in porous titanium by 5 orders of magnitude. The high-purity water phase obtained by the micro-channel filtration of the oil-water emulsion has a total organic carbon content of less than 25 ppm and an oil-water separation efficiency of more than 99.9%. Related results have been published in the "Science" sub-journal of the internationally renowned academic journal "Cell". Oil-water separation is a green technology that separates oil-water mixtures to achieve waste oil recycling and sewage purification. It is widely used in the fields of catering wastewater treatment, domestic sewage treatment, and petrochemical industry. The traditional separation method is limited to the case of large oil droplet size. When the oil droplet size is as small as tens of microns or less, the separation effect is almost lost. In order to achieve efficient separation of micron-level oil droplets (ie oil-water emulsions) in water, materials with high porosity and super-wetting, good chemical and mechanical stability are needed. Porous titanium is an ideal filter material. However, it is not super-wetting and has no separation effect on oil-water emulsions. At the same time, due to the limitation of its microchannel size, it is difficult to use traditional methods for super-wetting modification. The penetrating anodic oxidation method developed by the research team can prepare and adjust the super-hydrophilic nanotube coating in the porous titanium three-dimensional microchannel, and finally achieve the efficient separation of oil-water emulsions. The method breaks through the bottleneck of traditional oil-water separation technology and has wide application prospects. At present, small prototypes based on this technology have been successfully developed. (Reporter Yu Huiyou)
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