Dalapati Rana, Nandi Soutick, Gogoi Chiranjib, Shome Arpita, Biswas Shyam
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):8563-8573. doi: 10.1021/acsami.0c21337. Epub 2021 Feb 12.
Marine oil spill cleanup is one of the major challenges in recent years due to its detrimental effect on our ecosystem. Hence, the development of new superhydrophobic oil absorbent materials is in high demand. The third-generation porous materials, namely metal-organic frameworks (MOFs), have drawn great attention due to their fascinating properties. In this work, a superhydrophobic MOF with UiO-66 ( topology was synthesized strategically with a new fluorinated dicarboxylate linker to absorb oil selectively from water. The fully characterized superhydrophobic MOF showed extreme water repellency with an advancing water contact angle (WCA) of 160° with a contact angle hysteresis (CAH) of 8°. The newly synthesized porous MOF ( = 873 m g) material with high WCA found its promising application in oil/water separation. The superhydrophobic MOF was further used for the in-situ coating on naturally abundant cotton fiber to make a superhydrophobic MOF@cotton composite material. The MOF-coated cotton fiber composite () showed water repellency with a WCA of 163° and a low CAH of 4°. The flexible superhydrophobic showed an oil absorption capacity more than 2500 wt % for both heavy and light oils at room temperature. The superoleophilicity of was further exploited to separate light floating oil as well as sedimentary heavy oil from water. material can also separate oil from the oil/water mixture by gravity-directed active filtration. Hence, the newly developed MOF-based composite material has high potential as an oil absorbent material for marine oil spill cleanup.
海洋溢油清理是近年来的重大挑战之一，因为它对我们的生态系统有不利影响。因此，新型超疏水吸油材料的开发需求迫切。第三代多孔材料，即金属有机框架（MOF），因其迷人的特性而备受关注。在这项工作中，通过一种新型氟化二羧酸连接体策略性地合成了具有UiO-66拓扑结构的超疏水MOF，以从水中选择性地吸收油。经充分表征的超疏水MOF表现出极强的拒水性，前进水接触角（WCA）为160°，接触角滞后（CAH）为8°。新合成的具有高WCA的多孔MOF（ = 873 m g）材料在油水分离中显示出有前景的应用。超疏水MOF进一步用于在天然丰富的棉纤维上进行原位涂层，制成超疏水MOF@棉复合材料。MOF涂层的棉纤维复合材料（）表现出拒水性，WCA为163°，CAH低至4°。这种柔性超疏水材料在室温下对重油和轻油的吸油能力均超过2500 wt%。 的超亲油性进一步被用于从水中分离轻质浮油以及沉积的重油。 材料还可以通过重力导向的主动过滤从油水混合物中分离油。因此，新开发的基于MOF的复合材料作为海洋溢油清理的吸油材料具有很高的潜力。
