基于液体门控技术的超滑铜网油−油分离研究

Study on oil-oil separation with super-slippery copper mesh based on liquid gating technology

先采用阳极氧化法在铜网表面原位生长Cu(OH)_(2)纳米针来构建粗糙结构,再采用氟硅烷改性得到超疏水铜网,随后在超疏水铜网表面灌注乙二醇,形成液体门控型超滑铜网表面。利用接触角测量仪、扫描电子显微镜及X射线衍射仪分析了超疏水铜网的油接触角、水接触角、表面形貌和组成成分,并测试了灌注乙二醇的超滑铜网表面的油接触角。结果表明,超疏水铜网对水的接触角为150°,对二硫化碳的接触角为0°,对二硫化碳、石油醚和正己烷的初次油水分离效率都在90%以上,循环使用50次之后的油水分离效率仍在85%以上。灌注乙二醇的超滑铜网对上述3种有机液体的接触角均大于140°,对它们分别与乙二醇构成的油−油体系的分离效率均超过95%。

A liquid-gated super-slippery copper mesh was prepared by the following steps:(a)anodic oxidation to fabricate a rough structure by in-situ growth of Cu(OH)_(2) nano-needles on the surface of copper mesh;(b)modification with fluoroalkylsilane to form a superhydrophobic surface;and(c)dropping ethylene glycol onto the surface of the superhydrophobic copper mesh.The contact angle to oil and water,morphology,and composition of the superhydrophobic copper mesh surface were analyzed with contact angle goniometer,scanning electron microscope,and X-ray diffractometer,respectively.The oil contact angle of the super-slippery copper mesh filled with ethylene glycol was also measured.The results showed that the superhydrophobic copper mesh featured a contact angle of 150°to water and 0°to carbon disulfide.The separation efficiency of carbon disulfide,petroleum ether,or n-hexane from water was higher than 90%when using the superhydrophobic copper mesh initially and still maintained 85%after reusing it for 50 cycles.The contact angle of the super-slippery copper mesh filled with ethylene glycol to the said three kinds of organic liquids was larger than 140°,and the separation efficiency of them from carbon disulfide was 95%above when using the super-slippery copper mesh.