耐腐蚀超疏水超亲油不锈钢网的制备及其在油水分离过程中的应用

以不锈钢网为基底,通过化学刻蚀法制备微米级粗糙表面,通过一步浸泡法将st9ber法制得的疏水亲油纳米Si O2颗粒沉积到粗糙的不锈钢网表面,制备了具有微纳二级粗糙结构的超疏水超亲油不锈钢网。利用扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)和接触角测量仪(CA)表征了超疏水超亲油不锈钢网的表面形貌、化学组成和润湿性能,并将其用于油水分离过程中。结果表明,疏水亲油纳米Si O2颗粒成功的沉积到不锈钢网表面;水滴在超疏水超亲油不锈钢网上的接触角最大为151°,煤油的接触角为0°;制备的超疏水超亲油不锈钢网不仅能高效的分离不同种类油和水的混合物,还能高效的分离油和腐蚀性液体(强酸或强碱水溶液)的混合物,其耐腐蚀特性可满足复杂环境下的油水分离要求。

Preparation of anti-corrosion superhydrophobic/superoleophilic stainless steel mesh and its application in oil/water separation

Using stainless steel mesh as substrate, a superhydrophobic/superoleophilic stainless steel mesh with micro/nano hierarchical structure was prepared. The surface with micron-sized roughness was obtained through chemical etching and was then coated with hydrophobic/oleophilic nano-silica (the nano-silica was obtained by stöber method) through one step immersing method. The surface morphology, chemical composition and wettability of the superhydrophobic/superoleophilic stainless steel mesh were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and contact angle measurement (CA). The mesh was used in oil/water separation process. Results show that hydrophobic/oleophilic nano-silica was coated on the surface of chemical etched stainless steel mesh. The surface of the prepared mesh exhibited superhydrophobicity and superoleophilicity with a water contact angle of 151° and kerosene contact angle of 0°. The prepared mesh could efficiently separate not only the mixtures of water and different kinds of oil but also the mixtures of oil and corrosive aqueous solutions (containing strong acid or alkali). The anti-corrosion ability could meet the requirements of oil/water separation in complex environments.