Designing a single superabsorbent for separating oil from both layered as well as micron/submicron size emulsified oil/water mixtures by gamma radiation assisted grafting
Designing a single superabsorbent for separating oil from both layered as well as micron/submicron size emulsified oil/water mixtures by gamma radiation assisted grafting
复制标题
DOI：
10.1039/c6ra01162d
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Sarma, K. S. S.
中科院分区：
文献类型：
--
作者：
Chowdhury, Subhendu Ray;Jha, Atanu;Sarma, K. S. S.
在当今时代，从层状混合物或乳状液中分离油水是一项极其重要的挑战。市售的聚氨酯(PU)海绵对液体没有选择性。在本文中，我们介绍了一种快速、一步、可扩展、经济和可持续的方法，通过伽马辐射辅助接枝低表面能分子(甲基丙烯酸十二酯)将对油性液体的超级选择性引入到海绵中。通过接枝过程形成的共价键为材料提供了高度耐用的特殊润湿性能(超疏水和超亲油)，而不会影响其固有的机械性能。我们证明，单一的“超级”吸油剂(改性PU海绵)可以高效地快速分离层状油水混合物和乳液(微米和亚微米尺寸)，这在文献中是前所未有的。在这里，报道的材料提供了一种更节能、更方便的方法来从分层和乳化的油水混合物中分离油水。扫描电子显微镜(SEM)图像表明，在改性后的PU海绵表面，由于DMA的辐射接枝，形成了粗糙的表面，表面有微米、亚微米和纳米尺寸的半球或凸起(起伏)，这是这种转变的原因。此外，同样一块改性的PU海绵可以重复使用至少100次以上，而不会影响其机械和物理(特殊润湿)性能。
Separation of oil-water from either its layered mixtures or emulsions is an extremely important challenge in this modern era. Commercially available polyurethane (PU) sponge does not have selectivity towards liquid. In this article, we introduce a rapid, single step, scalable, economic and sustainable route to introduce super selectivity towards oily liquid to the sponge upon modification via gamma radiation assisted grafting of a low surface energy molecule (dodecyl 2-methacrylate). The covalent bond formed through grafting process, provides a highly durable special wettable property (superhydrophobicity and superoleophilicity) to the material without compromising its inherent mechanical property. We demonstrate that single the 'super'-oil-absorbent (modified PU sponge) is highly efficient to separate quickly both layered oil-water mixtures and emulsions (micron and submicron size), which is unprecedented in the literature. Here, the reported material provides an energy efficient and more convenient approach to separate oil-water from both layered and emulsified oil/water mixture. SEM image indicates the formation of a rough surface on a modified PU sponge with some micron, submicron and nanosize hemispheres or bumps (ups and downs) due to the gamma-radiation based grafting of DMA, which is the cause behind this transformation. Moreover, the same piece of this modified PU sponge can be repetitively used in separation of oil-water formore than 100 times at least without compromising its mechanical & physical (special wetting) properties.