高通量葡萄糖酸改性不锈钢网的制备及其油水分离性能研究

Preparation of Gluconic Acid Modified High Flux Stainless Steel Mesh and its Oil/Water Separation Performance

采用一步法将不锈钢网进行酸刻蚀并吸附葡萄糖酸(GA),成功制备了超亲水-水下超疏油的葡萄糖酸改性不锈钢网(GAG-网)。采用扫描电子显微镜、X-射线光电子能谱仪对GAG-不锈钢网表面形貌和化学组分进行表征,结果表明GA成功地吸附在了不锈钢网上和网表面成功构造微纳米粗糙结构。采用接触角测量仪对其表面进行了润湿性测试,在空气中,水滴在其表面接触角为0°;在水下,油滴在其表面接触角大于150°。GAG-网能够有效地分离多种油水混合物,分离效率均达到98%以上,分离通量达140 L·(m^2·s)^(-1);分离正己烷/水的混合物40次后仍具有99.5%以上的分离效率;在腐蚀性环境中也具有优异的分离能力。该方法简单绿色,制备过程无需任何电器和机械设备。制备的GAG-网油水分离性能优异,在处理油水混合物方面具有潜在的应用前景。

Stainless steel(SS)mesh etched with HCl and modified with gluconic acid(GA)via one-step immersion(GAG-mesh)was prepared and the mesh had properties of superhydrophilicity and underwater superoleophobicity.Surface morphology and chemical composition of GAG-mesh were characterized by SEM and XPS,respectively.The results show that GA is successfully adsorbed onto the surface with rough micro-nanostructure surface.Surface wettability was tested by contact angle(CA)measurement.The results show that CA of water on its surface is0°in air while it is greater than150°under water.GAG-mesh can effectively separate oil-water mixtures with over98%separation efficiency and140L·(m2·s)-1separation flux.The separation efficiency of n-hexane/water mixture is more than99.5%after using for40times.Moreover,its separation ability is excellent even in corrosive environment.This separation approach is simple and no electrical and mechanical equipment is needed,which has great application potential.