In recent years, with the increasing occurrence of industrial oily wastewater discharge and marine oil spills, the treatment of oil pollution has become a major challenge facing the world. Therefore, research on efficient oil-water separation materials and technologies has important scientific significance and application value.
At present, the traditional oil pollution control is still based on centrifugation, combustion, flotation and membrane separation methods, but the above methods have certain deficiencies, such as high energy consumption, long time, high cost, complicated steps, Add harmful solvents and easily cause secondary pollution.
Recently, the team of Zheng Wenge, a researcher in the Polymer Division of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, based on the previous research work on dense structure and uniformly oriented cell structure (PK Huang, et al. ) 282-290; PK Huang, et al. Compos. Part A-Appl. S. 116 (2019) 180-186), proposed a new hollow gradient cell structure, and successfully prepared a new type of highly efficient oil and water Isolated hollow gradient polypropylene foam. The preparation method is not only fast and low in cost, but also environmentally friendly without adding any solvent. Related results have been published in international academic journals (PK Huang, et al. Chem. Eng. J. 370 (2019) 1322-1330), and related patents have been applied for.
The design concept of the structure comes from nature, and combines the rough surface of the lotus, the honeycomb structure and the hollow structure of straw. With the lipophilic and hydrophobic properties of polypropylene foam materials, combined with the unique structural design, it gives the material excellent oil-water separation performance. When the oil-water mixture passes through the hollow gradient polypropylene foam, water can quickly pass through the hollow channel, and the oil is stored in the open-cell structure inside the material.
The above work was strongly supported by the National Natural Science Foundation of China (51603218, 51473181).
Figure 1 Same extruder, different structure
Figure 2 Bionic hollow gradient structure and its potential applications
Figure 3 is the mixture of oil and water, the water is out
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