Department of Building, Civil and Environmental Engineering, Concordia University, Montreal H3G 1M8, Canada.
Department of Building, Civil and Environmental Engineering, Concordia University, Montreal H3G 1M8, Canada.
J Hazard Mater. 2022 Aug 15;436:129228. doi: 10.1016/j.jhazmat.2022.129228. Epub 2022 May 25.
It is well known that oil stranded on shoreline substrates can be difficult to remove and cause serious environmental effects. To address this issue, a calcium alginate-cellulose nanocrystal (CA-CNC)-based coating with a unique surface structure and superhydrophobic properties was developed to reduce the extent of shoreline oiling. The results of batch washing test showed that not only did the introduction of CNC not reduce the oil removal efficiency; it also improved the environmental stability of the coating to resist the effects associated with seawater immersion and erosion (especially in the case of 0.4 wt% of CNC). The oil-repellent performance of the coated gravels implied that both oscillation time and oil concentration had almost no effects on the amount of adhered oil. Assessment of oiling prevention based on the laboratory shoreline tank simulator proved the coated gravel performed very well as more oil floated and less oil remained on substrates and penetrated into the subsurface. Biotoxicity analysis showed that the coating powders reduced impacts on the toxicity of the oil to algae at low doses. There is a good potential for the use of this CA-CNC based coating technique to improve shoreline oil spill response.
众所周知，搁浅在海岸基质上的油污很难清除，会对环境造成严重影响。为了解决这个问题，开发了一种具有独特表面结构和超疏水性能的基于海藻酸钠-纤维素纳米晶体（CA-CNC）的涂层，以减少海岸线的油污程度。批量洗涤测试的结果表明，引入 CNC 不仅不会降低除油效率，反而提高了涂层的环境稳定性，能够抵抗海水浸泡和侵蚀的影响（特别是在 CNC 含量为 0.4wt%的情况下）。涂覆砾石的疏油性能表明，振荡时间和油浓度对附着油的量几乎没有影响。基于实验室海岸线水槽模拟器的防油评估证明，涂覆砾石的效果非常好，因为更多的油漂浮在水面上，而更少的油残留在基质上并渗透到地下。生物毒性分析表明，在低剂量下，涂层粉末减少了油污对藻类毒性的影响。这种基于 CA-CNC 的涂层技术具有改善海岸线溢油应急响应的良好潜力。
