耐化学腐蚀FAS-TiO2超疏水网制备及其油水分离性能

Fabrication and Oil/Water Separation Performance of a Chemical Resistant Superhydrophobic Mesh

采用溶胶凝胶法在不锈钢网上涂覆二氧化钛(TiO_2)颗粒构筑了微纳米级粗糙表面,然后通过氟硅烷(FAS)接枝改性降低表面能,制备了一种耐化学腐蚀的氟硅烷-二氧化钛(FAS-TiO_2)超疏水网,并将其应用在油水分离中。采用水接触角(WCA)、扫描电子显微镜(SEM)、X射线光电子能谱分析(XPS)对FAS-TiO_2网进行了表征,分析了FAS-TiO_2网的实际应用性能。结果表明水滴与所制备的网表面接触角为159°,且滑动角非常小;FAS-TiO_2超疏水网在腐蚀性溶液,极性有机溶剂及热溶液中具有优异的化学、热稳定性及再循环使用能力。而且FAS-TiO_2超疏水网能够仅利用重力驱动,快速高效地分离各种油水混合物。在苛刻的酸、碱、盐和热环境下FAS-TiO_2网重复使用30次,其油水分离效率仍然保持在95%以上。FAS-TiO_2网制备过程简易、性能优异,在油水分离中有着广泛的适用性。

A superhydrophobic mesh with exceptional chemical resistance and high oil-water separation efficiency was prepared via a facile and effective approach using sol-gel coating of TiO2 followed by FAS modification. The properties of the FAS-TiO2 mesh were characterized by water contact angle（WCA）, SEM and XPS, and the results show that the mesh has WCA of 159° with extreme low sliding angle. Chemical stability and reusability of the superhydrophobic mesh is confirmed in various environments such as corrosive solutions, polar organic solvents and hot water. Because of its unique surface wettability, a variety of oil/water mixtures can be readily and effectively separated by the superhydrophobic mesh without external pressure. Moreover, the as-prepared mesh demonstrates high efficiency of over 95% even after 30 separation cycles in acidic, alkaline and salty solution conditions. The prepared superhydrophobic mesh has advantages of simple fabrication and excellent durability, which is promising for oil/water separation.