通过电解诱导界面 pH 值构建可调节润湿性的可扩展膜用于油水分离,Advanced Functional Materials

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通过电解诱导界面 pH 值构建可调节润湿性的可扩展膜用于油水分离
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-08-09 , DOI: 10.1002/adfm.202305975
Shaopeng Gan ₁ , Hui Li ₁ , Xu Zhu ₁ , Xilu Liu ₁ , Kangxing Wei ₂ , Lei Zhu ₁ , Baojun Wei ₂ , Xiaoming Luo ₃ , Jianqiang Zhang ₂ , Qingzhong Xue ₁

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pH刺激可调的润湿性由于其快速响应和广泛的控制范围在液体粘附、运输、收集和分离方面具有巨大的潜力。然而，在没有酸碱污染的情况下在材料的选定区域实现 pH 调节的润湿性对现有方法提出了明显的挑战。在这里，通过调节界面 pH 值制备了可调节润湿性的可扩展导电网络膜。膜选定区域上界面 pH 值的产生和扩散通过限制电解过程进行调节，该过程适应导电网络和电势的空间排列。通过调节界面pH值（>13），选定区域的润湿性可以在15 V下30 s内从超疏水性（水接触角= 150°）变为超亲水/水下超疏油性（水接触角= 0°）基于可切换的润湿性和精确的可控性，所制备的膜可以高效地实现按需油水分离（>99%）和原位萃取-反萃取。这种具有可切换润湿性的膜是可编程的且无酸碱污染，在智能流体相关系统中可能具有广泛的实际应用潜力。

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Constructing Scalable Membrane with Tunable Wettability by Electrolysis-Induced Interface pH for Oil–Water Separation

The tunable wettability by pH-stimulus has great potential in liquid adhesion, transport, collection, and separation due to its rapid response and wide control range. However, achieving pH-regulated wettability on the selected region of material without acid–base contamination presents a distinct challenge for the existing methods. Here, a scalable conductive network membrane is prepared with switchable wettability by regulating interfacial pH. The generation and diffusion of interfacial pH on the selected region of the membrane are regulated through the confinement electrolysis process, which is adapted to both spatial arrangements of the conductive network and the electrical potential. By regulating the interfacial pH (>13), the wettability of the selected region can change from superhydrophobicity (Water contact angle = 150°) to superhydrophilicity/underwater superoleophobicity (Water contact angle = 0°) without additional reagent in 30 s under 15 V. Based on the switchable wettability and precise controllability, the prepared membrane can efficiently realize on-demand oil–water separation (>99%) and in situ extraction-back extraction. The membrane with switchable wettability is programable and free of acid–base contamination, which may have broad practical application potential in intelligent fluid-related systems.

更新日期：2023-08-09

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