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首页> 外文期刊>Environmental toxicology and chemistry >Microplastic-Contaminant Interactions: Influence of Nonlinearity and Coupled Mass Transfer
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Microplastic-Contaminant Interactions: Influence of Nonlinearity and Coupled Mass Transfer

机译：微塑性污染物相互作用：非线性和耦合传质的影响

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Microplastic particles are ubiquitously detected in the environment. Despite intensive public and scientific discussions, their potential to transport contaminants in rivers and oceans under environmental conditions is still under assessment. In the present study we measured sorption isotherms and kinetics in batch experiments using phenanthrene (as a typical hydrophobic wastewater contaminant) and microplastic particles of different sizes and materials. We observed a linear sorption isotherm for polyethylene, in contrast to nonlinear sorption of polyamide and polystyrene, which could be best described by the Freundlich and the Polanyi-Dubinin-Manes isotherms, respectively. We modeled sorption kinetics as a combination of external mass transfer governed by diffusion through an aqueous boundary layer and intraparticle diffusion within the plastic. Which of these processes controls the kinetics depends on the sorption strength, particle size, diffusion coefficients, and time. We used semi-analytical and numerical methods to simulate the coupled mass transfer for both linear and nonlinear sorption. We successfully applied the semi-analytical model to polyethylene and the numerical code to polyamide and polystyrene, reproducing the measured kinetics and obtaining reasonable values for mass transfer and intraparticle diffusion coefficients. Subsequently, we used these coefficients to estimate the transport potential and relevant time scales for microplastic-bound contaminants under environmental conditions. Environ Toxicol Chem 2019:1-10. (c) 2019 SETAC
机译：在环境中普遍检测到塑料微粒。尽管进行了广泛的公众和科学讨论，但仍在评估其在环境条件下在河流和海洋中运输污染物的潜力。在本研究中，我们在分批实验中使用菲（作为典型的疏水性废水污染物）和不同尺寸和材料的微塑料颗粒，测量了吸附等温线和动力学。我们观察到聚乙烯的线性吸附等温线与聚酰胺和聚苯乙烯的非线性吸附相反，这可以分别用Freundlich和Polanyi-Dubinin-Manes等温线最好地描述。我们将吸附动力学建模为外部质量转移的组合，外部质量转移受通过水边界层的扩散和塑料内部颗粒的扩散控制。这些过程中哪个控制动力学取决于吸附强度，粒径，扩散系数和时间。我们使用半分析和数值方法来模拟线性和非线性吸附的耦合传质。我们成功地将半分析模型应用于聚乙烯，并将数字代码应用于聚酰胺和聚苯乙烯，从而重现了测得的动力学并获得了传质和颗粒内扩散系数的合理值。随后，我们使用这些系数来估计在环境条件下与塑料结合的污染物的运输潜力和相关的时间尺度。环境毒性化学2019：1-10。 （c）2019年SETAC

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