On-demand oil/water separation of 3D Fe foam by controllable wettability
On-demand oil/water separation of 3D Fe foam by controllable wettability
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DOI：
10.1016/j.cej.2017.08.081
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发表时间：
2018-01-01
影响因子：
15.1
通讯作者：
Ren, Luquan
中科院分区：
文献类型：
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作者：
Liu, Yan;Zhan, Bin;Ren, Luquan
随着溢油事故的增加和含油废水的排放，含油污染已成为世界性问题。具有超疏水或水下超疏油特性来应对油污的材料已被频繁报道，但具有可控润湿转变性能的材料仍鲜有报道。在此，我们提出了一种简便、高效、经济的方法来制备超润湿泡沫铁，该泡沫铁可以通过交替改性和退火实现可控的润湿性转变。改性泡沫显示出超疏水和超亲油特性（除油模式），可用于油/水混合物中重油的过滤。经过退火处理，制备的样品表现出超亲水/水下超疏油特性（除水模式），允许水通过但阻挡轻质油。此外，所制备的泡沫可以分离各种油/水混合物，并表现出较高的分离效率。我们希望可控润湿性过滤样品能够实现按需油水分离，为解决油污染问题提供新思路。
Oily pollution has become a worldwide problem due to the increasing of oil spill accidents as well as the discharge of oily wastewater. Material with superhydrophobic or underwater superoleophobic characteristic to deal with oily pollution have been reported frequently, but material with controllable wettability transition properties were still few been reported. Herein, we presented a facile, efficient, economical method to prepare a superwetting Fe foam that could achieve controllable wettability transition by modification and annealing alternately. The modified foam showed superhydrophobic and superoleophilic properties (oil-removing mode), which can be used for the filtration of heavy oil in the oil/water mixtures. With the annealing treatment, the as-prepared sample exhibited superhydrophilic/underwater superoleophobic characters (water-removing mode), which allowed water to pass through but blocked light oil. Besides, the as-prepared foam could separate various oil/water mixtures and show high separation efficiency. We are hoping that the controllable wettability filtration sample could realize on-demand oil/water separation and provide a new idea to solve the oil pollution problem.