Highly reusable and superhydrophobic spongy graphene aerogels for efficient oil/water separation.
Highly reusable and superhydrophobic spongy graphene aerogels for efficient oil/water separation.
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DOI：
10.1038/s41598-017-07583-0
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发表时间：
2017-08-02
影响因子：
4.6
通讯作者：
Li B
中科院分区：
文献类型：
--
作者：
Luo Y;Jiang S;Xiao Q;Chen C;Li B
石墨烯气凝胶（GAs）是具有独特润湿性的三维（3D）石墨烯海绵，并且已经证明了减少石油泄漏和化学事故污染的潜力。在此，我们报告了新的聚氨酯（PU）海绵增强的气体具有低表面能，高吸附能力和良好的可回收性作为有效的石油吸附剂。通过简单地冷冻铸造还原氧化石墨烯（rGO）以形成压实的宏观尺度海绵来制备具有分级多孔形态的海绵状石墨烯气凝胶（SGA）。这种新型的微结构受益于嵌入式石墨烯的优点，并呈现可逆的大应变变形（90%），高压缩强度（63 kPa）和粘弹性稳定性。除了超疏水性之外，这些优异的上级性质赋予气凝胶优异的可回收性而不劣化吸油性能。此外，SGA具有选择性和高体积吸附能力（>100%），并且在连续泵送作用下可以有效地分离油与水。优异的吸附性能和强大的机械性能使这种石墨烯材料有望用于大规模回收溢油。
Graphene aerogels (GAs) are three-dimensional (3D) graphene sponges with unique wettability and have demonstrated the potential for reducing contamination from oil spills and chemical accidents. Herein, we report new polyurethane (PU) sponge-reinforced GAs with low surface energy, high sorption capacity and excellent recyclability for use as efficient oil sorbents. Spongy graphene aerogels (SGAs) with a hierarchical porous morphology were produced by simply freeze-casting reduced graphene oxide (rGO) to form compacted macroscale sponges. This novel micro-structure benefits from the advantages of embedded graphene and presents reversible large-strain deformation (90%), high compressive strength (63 kpa) and viscoelastic stability. These superior properties, in addition to super-hydrophobicity, endow the aerogels with excellent recyclability without deteriorating the oil absorption performance. Furthermore, SGA has selective and high-volume absorbability (>100%) and can efficiently separate oil from water under continuous pumping action. The excellent absorption performance and robust mechanical properties make this graphene material promising for the large-scale recovery of spilled oil.
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