酶促咖啡酸制备超疏水棉织物及其油水分离应用

Preparation of Super Hydrophobic Cotton Fabric Based on Caffeic Acid Catalyzed by Enzyme and Its Oil-Water Separation Application

海上溢油事故和工业废水的排放对环境造成的危害日益严重,为此选用棉织物并对其进行超疏水改性使其成为油水分离材料。先利用漆酶、咖啡酸和Fe^(2+)在棉织物表面构建微米级粗糙结构,之后利用低表面能物质十六烷基三甲氧基硅烷(HDTMS)修饰制备出具有复合结构的超疏水改性棉织物。对改性棉织物的表面形貌、化学组成、耐久稳定性、自清洁性能和油水分离性能进行测试。结果表明:当咖啡酸浓度为3 mg/L、硫酸亚铁浓度为12 mg/L、漆酶浓度为0.75 U/mL、HDTMS浓度为1%(质量分数,下同)时,制备的改性棉织物具有良好的超疏水性能,静态接触角高达164.6°,滚动角为6.75°。改性棉织物在耐摩擦、耐酸碱、耐水洗的测试中均表现出稳定的超疏水性能,并表现出良好的自清洁性能,在经过15次油水分离循环后,分离效率能保持在96%以上,在自清洁服装和油水分离的应用方面具有巨大的潜力。

The oil spill accident at sea and the discharge of industrial waste water have caused increasingly serious harm to the environment.Therefore,cotton fabric has been super hydrophobic modified to make it a potential material for oil water separation.Laccase,caffeic acid and Fe^(2+)were used to construct a micron scale rough structure on the surface of cotton fabric,and then the composite structure of super hydrophobic modified cotton fabric was prepared by modifying the cotton fabric with low surface energy substance hexadecyl trimethoxysilane(HDTMS).The surface morphology,chemical composition,durability,self-cleaning performance and oil-water separation performance of the modified fabric were tested.The results showed that when the concentration of caffeic acid was 3 mg/L,the concentration of ferrous sulfate was 12 mg/L,the concentration of laccase was 0.75 U/mL,and the concentration of HDTMS was 1%,the modified cotton fabric had good super hydrophobic properties.The static contact angle was 164.6°,and the rolling angle was 6.75°.The modified cotton fabric shows stable super hydrophobic perfor-mance in the tests of friction resistance,acid and alkali resistance,and water washing resistance,and shows good self-cleaning performance.After 15 oil-water separation cycles,the separation efficiency can be maintained at more than 96%,which has great potential in the application of self-cleaning clothing and oil-water separation.