Wu Xingwang, Lei Yonggang, Li Shuhui, Huang Jianying, Teng Lin, Chen Zhong, Lai Yuekun
National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Fuzhou 350116, PR China.
National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Fuzhou 350116, PR China; National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, PR China.
J Hazard Mater. 2021 Feb 5;403:124090. doi: 10.1016/j.jhazmat.2020.124090. Epub 2020 Sep 25.
Fast and efficient cleanup of high-viscosity oil spills on the sea is still a global challenge today. Traditional recycling methods are either energy demanding or inefficient. Hydrophobic/oleophilic sorbents are promising candidates to handle oil spills, but they have limited ability to recover high viscosity oil. In this work, we report a superhydrophobic/oleophilic carbon nanotubes (CNT) and polypyrrole (PPy) coated melamine sponge (m-CNT/PPy@MS). The CNT/PPy coating enables the sponge to convert light and electricity to heat, ensuring that the absorbent can adapt to various working environments. The rapid heat generation on the sponge surface can significantly reduce the viscosity of crude oil and accelerate the absorption rate, thereby achieving the purpose of rapid recovery of oil spills. Under one sun illumination (1.0 kW/m) and an applied voltage (8 V), the surface temperature of the m-CNT/PPy@MS can reach 118.6 °C. The complete penetration time of oil droplets is 93.5% less than that of an unheated sponge. In addition, under half sun irradiation intensity and 11 V, the porous sponge absorbed 6.92kg/m of crude oil in the first minute, which is about 31 times as much as that of an unheated sponge. Finally, we demonstrate a continuous absorption system, consisting of a self-heating m-CNT/PPy@MS and peristaltic pump, that can continuously recover oil spills on the sea surface. In view of its unique design, lower cost and fast oil absorption speed, this work provides a new option to tackle large-scale oil spill disasters on the sea surface.
如今，快速高效地清理海上高粘度溢油仍是一项全球性挑战。传统的回收方法要么能源需求大，要么效率低下。疏水/亲油吸附剂是处理溢油的有前途的候选材料，但它们回收高粘度油的能力有限。在这项工作中，我们报道了一种超疏水/亲油的碳纳米管（CNT）和聚吡咯（PPy）包覆的三聚氰胺海绵（m-CNT/PPy@MS）。CNT/PPy涂层使海绵能够将光和电转化为热，确保吸附剂能够适应各种工作环境。海绵表面的快速发热可以显著降低原油的粘度并加快吸收速度，从而实现快速回收溢油的目的。在一个太阳光照（1.0 kW/m）和施加电压（8 V）下，m-CNT/PPy@MS的表面温度可达到118.6°C。油滴的完全渗透时间比未加热的海绵减少了93.5%。此外，在半太阳光照强度和11 V下，多孔海绵在第一分钟内吸收了6.92kg/m的原油，约为未加热海绵的31倍。最后，我们展示了一个由自热m-CNT/PPy@MS和蠕动泵组成的连续吸收系统，该系统可以连续回收海面溢油。鉴于其独特的设计、较低的成本和快速的吸油速度，这项工作为应对大规模海面溢油灾害提供了一种新的选择。
