Preparation of ZnO modified stainless steel mesh with controllable wettability and its oil-water separation performance
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摘要: 为了制备出具有可控润湿性的不锈钢滤网,并根据其相关特性用与研究油水分离性能,本文通过水热法在不锈钢表面生长一层氧化锌,构造微纳米粗糙度,随后用不同链长的脂肪酸改性的方法,成功制备出具有可控润湿性的不锈钢滤网。采用接触角测量仪、傅里叶红外光谱仪、扫描电子显微镜及X射线衍射仪等分别对样品的润湿性和表面形貌及成分进行分析,采用油水分离装置表征样品的油水分离效率及重复使用性。结果表明依据不同链长的脂肪酸改性的样品出现了从超亲水到超疏水的润湿性变化,范围为0°~158°,油始终保持在0°。油水分离效率在92%~98%,重复使用50次后,仍然具有油水分离的性能。因此,制备的不锈钢滤网具有优异的油水分离性能和良好的重复使用性能。Abstract: In order to prepare stainless steel filter with controllable wettability and oil-water separation property, a layer of zinc oxide was grown on the surface of stainless steel by hydrothermal method to construct micro-nano roughness. Then, a stainless steel filter with controllable wettability was successfully prepared by modification of fatty acids with different chain lengths. The wettability, surface morphology and composition of the samples were analyzed by contact Angle measuring instrument, Fourier transform infrared spectrometer, scanning electron microscope and X-ray diffrotometer, respectively. The oil-water separation efficiency and reusability of the samples were characterized by oil-water separation device. The results show that the wettability of the samples modified by fatty acids with different chain lengths varie from superhydrophilic to superhydrophobic, ranging from 0° to 158°, and the oil remain at 0°. The oil-water separation efficiency is 92%-98%, and it still has oil-water separation performance after repeated use for 50 times. Therefore, the prepared stainless steel filter has excellent oil-water separation performance and good reuse performance.
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Key words:
- manipulation of wettability /
- oil-water separation /
- stainless steel mesh /
- hydrothermal /
- ZnO /
- fatty acids
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表 1 不同液体的表面张力及密度
Table 1. Surface tension and density of different liquids
Liquids Water 1,1,1dichlo-romethane Chloroform Kerosene n-heptane Petrol Surface tension/(mN·m−1) 72 28 29 24 20 22 Density/(g·mL−1) 1 1.32 1.5 0.8 0.683 0.75 -
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