鳞片状BiVO_(4)不锈钢网涂层的制备及其在油水分离中的应用

Preparation of scale-like BiVO_(4) coated mesh and its application in oil-water separation

随着石油泄漏事故的频繁发生和工业含油废水的大量排放,现代化工油水分离问题日益突出。具有特殊润湿性的材料可以选择性透过水或油,分离效率高且操作简单而广泛应用于油水分离。本文以不锈钢网为基底,通过液相法可控制备得到具有不同尺寸、排列的Bi VO_(4)纳米片涂层。通过扫描电子显微镜、原子力显微镜、接触角测量仪对其表面形貌与润湿性能进行表征,研究Bi VO_(4)纳米片尺寸和排列对水下疏油性能的影响。结果表明当不锈钢网表面均匀生长着鳞片状Bi VO_(4),且这些纳米片随机放射排列时,涂层水下油接触角达到了165.1°,倾斜角仅为2.0°,具有水下超疏油性质。将该涂层用于油水混合物的分离,分离效率均在95.0%以上且分离通量最大可达1.4×10^(4)L/(m^(2)·h),在油水分离领域展现出巨大的应用潜力。

Oil/water separation in modern chemical industry become an increasingly significant issue because of the frequent oil spills and large amounts of oily industrial waste water.Materials with special wettability have highly selectivity on oil or water permeation,high separation efficiency and advantage of easy operation,therefore they have been extensively used in oil/water separation application.Herein,different sizes and arrays of BiVO_(4)coated mesh were synthesized by liquid phase method.The surface morphology and wettability were characterized by scanning electronic microscopy(SEM),atomic force microscopy(AFM)and contact angle meter,and the effects of the size and array of BiVO_(4)on underwater oleophobic property were studied.Results showed that when scale-like BiVO_(4)grew on stainless steel mesh uniformly,and these nanosheets were randomly and radially arranged,the underwater oil contact angle and the sliding angle of the coating were 165.1°and 2°,respectively,which proved its underwater superoleophobic property.A series of oil-water mixtures were separated by the BiVO_(4)coated mesh,the separation efficiencies of all the mixtures were over 95.0%,and the separation flux was up to 1.4×10^(4)L/(m2·h).Therefore,it has great potential application in the field of oil-water separation industry.