Abstract：The surface of stainless steel mesh was modified to make it into a super hydrophobic surface, and thus the rapid and efficient separation of the oily wastewater was achieved. Firstly, a stainless steel mesh was used as a substrate with the surface coated by Si O2 sol, which was prepared by using chitosan and TEOS as silica source. Then, surface hydrophobic modification of stainless steel mesh was processed with methyltrichlorosilane ( MTCS) . The surface morphology and static contact angle of the super hydrophobic/lipophilic stainless steel mesh were characterized, and the oil-water separation efficiency was tested. The results show that, the prepared stainless steel mesh has excellently super-hydrophobic/oleophilic property with the water contact angle up to 154. 94°. The separation of oil and water mixtures can be easily achieved by using above material. and the decane/water mixture, separation efficiency can reach to 96. 62% after repeated 50 times. Meanwhile, the material can separate different kinds of oil-water mixtures with good separation performances, which demonstrates a broad application prospect for oil-water separation.

Keyword：stainless steel mesh;surface modification;oil and water separation;super-hydrophobic/lipophilic;separation efficiency;