Graphene Foam with Switchable Oil Wettability for Oil and Organic Solvents Recovery
Graphene Foam with Switchable Oil Wettability for Oil and Organic Solvents Recovery
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用于油和有机溶剂回收的具有可切换油润湿性的石墨烯泡沫
DOI：
10.1002/adfm.201403864
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发表时间：
2015
影响因子：
19
通讯作者：
Lu, Jianmei
中科院分区：
文献类型：
--
作者：
Xu, Qingfeng;Li, Hua;He, Jinghui;Lu, Jianmei
最普遍的环境问题之一是被油或有机溶剂污染的水;这一全球性挑战要求新兴材料能够有效地将油或有机溶剂从水中分离出来。在这里，通过将3D多孔石墨烯泡沫（GF）与智能pH响应表面集成来呈现这样的材料，其显示响应于介质pH的可切换的超亲油和超疏油特性。（2-乙烯基吡啶）和聚丙烯酸十六烷基酯（P2VP‐B‐PHA），智能GF（ss-GF）在不同的介质pH下具有超亲油或超疏油表面。所设计的ss‐GF可以通过以下方式从水性介质中有效地吸收油或有机溶剂：在pH 7.0下使用其超亲油表面，并且当pH切换到3.0时也可以完全释放吸附物（并且因此ss-GF的表面转变为超疏油）;通过许多循环的连续操作（例如，>10）。此外，所设计的ss‐GF对油和有机溶剂表现出上级吸收能力，相对于原始ss‐GF，其吸收能力高达196倍重量。目前的工作表明，鼓励应用的ss-GF的水-油和水-有机溶剂分离。
One of the most pervasive environmental issues is water contaminated with oil or organic solvents; this global challenge calls for emerging materials that could effectively separate oil or organic solvents from water. Here, such a material is presented by integrating 3D porous graphene foam (GF) with a smart pH‐responsive surface, showing switchable superoleophilic and superoleophobic properties in response to the medium pH. The key chemistry applied in this study is to modify the 3D porous GF with an amphiphilic copolymer containing a block of poly(2‐vinylpyridine) and polyhexadecyl acrylate (P2VP‐b‐PHA), resulting in a smart GF (ss‐GF) with an either superoleophilic or superoleophobic surface at different medium pH. The as‐designed ss‐GF can effectively absorb oil or organic solvents from the aqueous media by using its superoleophilic surface at pH of 7.0, and it can also completely release the adsorbates when the pH is switched to 3.0 (and the surface of ss‐GF is therefore shifted to superoleophobic); with a continuous operation of many cycles (e.g., >10). Furthermore, the as‐designed ss‐GF shows superior absorption capacity for oil and organic solvent, with a high capacity of ≈196 times of the weight relative to that of the pristine ss‐GF. The present work suggests encouraging applications of the ss‐GF to water–oil and water–organic solvent separation.
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