Ultrastable coaxial cable-like superhydrophobic mesh with self-adaption effect: facile synthesis and oil/water separation application
Ultrastable coaxial cable-like superhydrophobic mesh with self-adaption effect: facile synthesis and oil/water separation application
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DOI：
10.1039/c6ta01621a
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发表时间：
2016-05
影响因子：
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通讯作者：
Cai Xiao;L. Si;Yiming Liu;G. Guan;Dihua Wu;Zhongde Wang;Xiaogang Hao
中科院分区：
文献类型：
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作者：
Cai Xiao;L. Si;Yiming Liu;G. Guan;Dihua Wu;Zhongde Wang;Xiaogang Hao
采用简单、廉价和可控的脉冲电聚合方法（PPM）成功合成了具有特殊微纳米级粗糙度的同轴电缆状不锈钢wire@conducting聚合物（聚苯胺或聚吡啶）。通过酰化反应与硬脂酰氯（SC）偶联得到的网具有超疏水和超亲油的特性，其水接触角为154°，油接触角为0°，成功地应用于分离一系列油水混合物，分离效率超过98%。即使在重复使用25次之后，分离效率仍然很高（对于己烷/水混合物，分离效率为99.90%）。更重要的是，由于其自适应老化保护和抗氧化性能，所制备的网状物在长期储存、超声波处理，甚至在强酸、碱性、高盐和氧化溶液等极端环境条件下，都能保持超稳定的超疏水性和高分离效率。此外，电化学测量表明，超疏水网的腐蚀动态速率比裸不锈钢网低1/60。因此，本研究为制备高质量的超疏水和超亲油网提供了一种新的方法，以实现有效的油水分离。
A coaxial cable-like stainless steel wire@conducting polymer (polyaniline or polypyrrole) with special hierarchical micro–nanoscale roughness was successfully synthesized using a facile, inexpensive and controlled pulse electro-polymerization method (PPM). Conjugated with stearoyl chloride (SC) through an acylation reaction, the obtained meshes exhibit both superhydrophobic and superoleophilic properties with a water contact angle of 154° and an oil contact angle of 0°, which was successfully applied in separating a series of oil/water mixtures with a separation efficiency of over 98%. The separation efficiency also remains high even after 25 reuse cycles (99.90% for a hexane/water mixture). More importantly, owing to their self-adaption aging protection and antioxidant properties, the obtained meshes retain ultrastable superhydrophobicity and high separation efficiency in long-term storage, ultrasonic treatment, and even under extreme environment conditions of strong acidic, alkaline, hyperhaline and oxidizing solutions. In addition, electrochemical measurements indicate that the corrosion dynamic rate of the superhydrophobic mesh is 1/60 lower than that of bare stainless steel mesh. Therefore, this work provides a novel method to fabricate a high quality superhydrophobic and superoleophilic mesh for effective oil/water separation.