工廠和家庭排放的有機或油污染物一直以來都對環境和人類健康造成威脅，因此開發油水分離材料的需求日以俱增。在最近的研究中，為了處理更複雜的油水混合物（例如：不同密度的油），擁有智能感應的材料引起了極大的關注。在這篇論文中，我們開發了一種在纖維素膜的表面改質方法，並使其具備pH響應的功能。首先，受生物啟發的分子多巴胺(Dopamine)利用NaIO4氧化劑使纖維素膜表面均勻地覆蓋一層聚多巴胺 (PDA)。聚多巴胺（PDA）塗層不僅可以提供保護作用以防止酸破壞纖維素膜，且還可以引入反應端進行更進一步的改質（Michael addition and Schiff base reaction）。隨後，分別選擇二甲基胺基丙胺（DMAPA）和十八烷基胺（ODA）作為pH材料感應和疏水材料。兩種材料在溫和條件下同時導入，且為了避免使用有毒的有機溶劑，在整個過程中只使用了水和乙醇。改質後的纖維素膜在中性條件下為疏水性，而在酸（pH 2）中則轉變為親水性。換句話說，根據水的pH值，它可以是“除油”型和“除水”型分離材料。在油水分離的模擬實驗中，其分離效率可能達到99％。並展示了改質後的纖維素膜可以吸收水中的油，而再浸入酸（pH2）的之後便能使油脫附。這大大提升了其可重複利用性。我們相信這環境友好且簡易的製程方法可為創造智能感應材料提供了新的想法與途徑。

The organic or oil pollutant discharge from factory and household pose threat to environment and livings health. The demand for oil-water separation materials increase with days. Recently, the stimulus-responsive materials get great attention in order to handle more complicated situation (ex: different density of oils). In this work, we demonstrated a facile modification method on cellulose membrane and create a pH responsive surface. First, a bio-inspired molecule, dopamine, were oxidized by NaIO4 and uniformly coated on the membrane surface. The polydopamine (PDA) coating not only provide the protection to prevent acid harming cellulose membrane but also introduced the reactive sites for further modification (Michael addition & Schiff base reaction). Subsequently, dimethylaminopropylamine (DMAPA) and octadecylamine (ODA) were selected as pH responsive and hydrophobic materials, respectively. Both materials were introduced simultaneously under mild condition. To avoid using toxic organic solvent, water and ethanol were only used in the whole process. The modified cellulose membrane surface shows hydrophobic under neutral condition, while transforming into hydrophilic in acid (pH 2). That is, it could be both “oil-removing” and “water-removing” types separation material according to the pH of water. Also, the separation efficiency could reach 99%. We also demonstrate the modified cellulose membrane could absorb the oil in water and desorb the oil while immersing in acid (pH2). It gives the membrane surface has the “self-cleaning” ability. This environment-friendly and facile method provide a new way to create stimulus-responsive materials.

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