Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan.
Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan; Department of Public Health, College of Health Science, Kaohsiung Medical University, Kaohsiung, Taiwan; Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
Chemosphere. 2018 Sep;207:110-117. doi: 10.1016/j.chemosphere.2018.05.071. Epub 2018 May 15.
Mechanical recovery of oils using oil sorbents is one of the most important approaches to manage marine oil spills. However, the properties of the oils spilled into sea are influenced by external environmental conditions. In this study, we present a graphene-based (GB) sponge as a novel sorbent for crude oil removal and compare its performance with that of a commercial sorbent sheet under various environmental parameters. The GB sponge with excellent superhydrophobic and superoleophilic characteristics is demonstrated to be an efficient sorbent for crude oils, with high sorption capacity (up to 85-95 times its weight) and good reusability. The crude-oil-sorption capacity of our GB sponge is remarkably higher (about 4-5 times) than that of the commercial sheet and most other previously reported sponge sorbents. Moreover, several challenging environmental conditions were examined for their effects on the sorption performance, including the weathering time of oils, seawater temperature, and turbulence (wave effect). The results show that the viscosity of the oil increased with increasing weathering time or decreasing temperature; therefore, the sorption rate seemed to decrease with longer weathering times and lower temperatures. Turbulence can facilitate inner sorption and promote higher oil sorption. Our results indicate that the extent of the effects of weather and other environmental factors on crude oil should be considered in the assessment of the effective adsorption capacity and efficiency of sorbents. The present work also highlights the widespread potential applications of our GB sponge in marine spilled-oil cleanup and hydrophobic solvent removal.
使用吸油剂从油类物质中进行机械回收是处理海洋溢油事故的最重要方法之一。然而，溢入海洋的油类物质的性质会受到外部环境条件的影响。在本研究中，我们提出了一种基于石墨烯的（GB）海绵作为一种新型的吸油剂，用于去除原油，并在各种环境参数下将其性能与商业吸油片进行了比较。具有优异超疏水性和超亲油性的 GB 海绵被证明是一种有效的原油吸附剂，具有高吸附容量（高达其自身重量的 85-95 倍）和良好的可重复使用性。与商业吸油片和大多数其他先前报道的海绵吸附剂相比，我们的 GB 海绵的原油吸附容量显著更高（约高 4-5 倍）。此外，还研究了几种具有挑战性的环境条件对吸附性能的影响，包括油的风化时间、海水温度和湍流（波浪效应）。结果表明，随着风化时间的增加或温度的降低，油的粘度增加；因此，吸附速率似乎随着风化时间的延长和温度的降低而降低。湍流可以促进内部吸附并提高吸油效率。我们的结果表明，在评估吸附剂的有效吸附容量和效率时，应考虑天气和其他环境因素对原油的影响程度。本工作还突出了我们的 GB 海绵在海洋溢油清理和疏水性溶剂去除方面的广泛潜在应用。
