Microplastics and organic pollutants are typical contaminants in the marine environment. However, little is known about their interactions. In this study, the sorption of 3,6-Dibromocarbazole(3,6-BCZ) and 1,3,6,8-Tetrabromocarbazole (1,3,6,8-BCZ) by Polypropylene microplastic in simulated seawater was studied. Factors, including particle size, salinity and concentration, were investigated, and the experimental results were simulated using a mathematical model. Results showed that the pseudo-second-order kinetic model was more suitable to describe the sorption of polyhalogenated carbazole by microplastics, with equilibrium sorption times of 6 h and 8 h for 3,6-BCZ and 1,3,6,8-BCZ, respectively. Sorption capacity increased with decreasing particle size and the adsorption capacity increased initially and then decreased with increasing salinity, with a maximum sorption occurring at salinity of 14%. Moreover, the sorption amount increased with the increasing concentration of polyhalogenated carbazole. The sorption isotherms were confirmed as the extended Langmuir model and the extended Freundlich model, both of which were S-type.

中文翻译：

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微塑料吸附 3,6-二溴咔唑和 1,3,6,8-四溴咔唑。

微塑料和有机污染物是海洋环境中的典型污染物。然而，人们对它们的相互作用知之甚少。本研究研究了聚丙烯微塑料在模拟海水中对3,6-二溴咔唑(3,6-BCZ)和1,3,6,8-四溴咔唑(1,3,6,8-BCZ)的吸附作用。研究了颗粒大小、盐度和浓度等因素，并使用数学模型模拟了实验结果。结果表明，拟二级动力学模型更适合描述微塑料对多卤代咔唑的吸附，3,6-BCZ和1,3,6,8-BCZ的平衡吸附时间分别为6 h和8 h。 ， 分别。吸附容量随着粒径的减小而增加，吸附容量随着盐度的增加先增加后减小，最大吸附发生在盐度为 14% 时。此外，吸附量随着多卤代咔唑浓度的增加而增加。吸附等温线被证实为扩展的 Langmuir 模型和扩展的 Freundlich 模型，两者均为 S 型。