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 from Hunan Province, and Han Zheng, a researcher at the Institute of Metal Research of the Chinese Academy of Sciences, jointly developed an international team such as the Chemical and Engineering Research Institute of the Singapore Science and Technology Bureau. The osmotic anodizing method can realize the full coverage of the super-hydrophilic coating in the porous titanium three-dimensional microchannel with a pore diameter of 10 - 100 μm and a thickness of 1-5 mm, so that the permeation rate of water droplets in the porous titanium is increased by 5 orders of magnitude. The high-purity aqueous phase obtained by microchannel filtration of oil-water emulsion has a total organic carbon content of less than 25ppm, and the oil-water separation efficiency is over 99.9%. Related results have been published in the internationally renowned academic journal Cell, iScience.
Oil-water separation is a green technology that separates oil-water mixture to achieve waste oil recycling and sewage purification. It is widely used in restaurant wastewater treatment, domestic sewage treatment, petrochemical industry, etc. Traditional separation methods are limited to oil. The case where the droplet size is large. When the oil droplet size is as small as several tens of micrometers, the separation effect is almost lost.
In order to achieve efficient separation of micron-sized oil droplets (ie, oil-water emulsions) in water, materials with high porosity and super-wetting properties with good chemical and mechanical stability are required. Porous titanium is an ideal filter material. However, It does not have super-wetting properties and has no separation effect on oil-water emulsions. At the same time, due to the limitation of microchannel size, it is difficult to carry out super-wetting modification by traditional methods. The research team developed the osmotic anodizing method, which can be used in porous titanium three-dimensional The super-hydrophilic nanotube coating is prepared and regulated in the channel, and the high-efficiency separation of the oil-water emulsion is finally realized. The method breaks through the bottleneck of the traditional oil-water separation technology and has wide application prospects. At present, the small-scale prototype based on this technology has been successfully developed.
