Iravani Rezvan, An Chunjiang, Mohammadi Mojtaba, Lee Kenneth, Zhang Kaiqiang
Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, H3G 1M8, Canada.
Research Centre for High Performance Polymer and Composite Systems (CREPEC), Department of Chemical Engineering, Polytechnique Montreal, Montreal, H3C 3A7, Canada.
Environ Sci Pollut Res Int. 2022 Jul;29(33):50540-50551. doi: 10.1007/s11356-022-19150-w. Epub 2022 Mar 1.
When oil is released into the oceans, spilled oil may get to the shoreline driven by wind and wave. This study comprehensively explored the effects of bentonite nanoclay on the oil behaviors in a water-sand system from both experimental and modeling perspectives. Four factors including nanoclay concentration, temperature, salinity, and pH have been studied. The increasing nanoclay concentration resulted in the decrease in remaining oil on sand. Higher temperature and salinity were associated with less residual oil on sand in the presence of nanoclay. The lower residual oil on sand with coexisting nanoclay was found to be at pH 7. The factorial analysis results indicated that the nanoclay concentration showed the most significant impact among these factors. Miscibility modeling results showed an increasing temperature was favorable to the nanoclay miscibility. Moreover, the effect of nanoclay on oil behavior was further revealed through the dynamic simulation, in which it can be seen the nanoclay could penetrate into oil droplets and promote the oil detachment from solid substrate. The results of this study can help understand the role of fine particles in the fate and transport of oil on shoreline and support the risk assessment and response planning after oil spill.
当石油泄漏到海洋中时，溢出的石油可能会在风浪的作用下抵达海岸线。本研究从实验和建模两个角度全面探讨了膨润土纳米粘土对水 - 砂体系中石油行为的影响。研究了纳米粘土浓度、温度、盐度和pH值这四个因素。纳米粘土浓度的增加导致砂上剩余油量减少。在存在纳米粘土的情况下，较高的温度和盐度与砂上较少的残余油有关。发现共存纳米粘土时砂上残余油含量较低的pH值为7。因子分析结果表明，在这些因素中纳米粘土浓度的影响最为显著。混溶建模结果表明，温度升高有利于纳米粘土的混溶。此外，通过动态模拟进一步揭示了纳米粘土对油行为的影响，从中可以看出纳米粘土能够渗透到油滴中并促进油从固体基质上脱离。本研究结果有助于理解细颗粒在海岸线石油归宿和运移中的作用，并为溢油后的风险评估和应对规划提供支持。
