State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, Center for Environmental Health Research, South China Institute of Environmental Sciences, The Ministry of Ecological and Environment of PR China, Guangzhou 510655, PR China; School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, PR China.
State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, Center for Environmental Health Research, South China Institute of Environmental Sciences, The Ministry of Ecological and Environment of PR China, Guangzhou 510655, PR China.
Ecotoxicol Environ Saf. 2021 Mar 1;210:111842. doi: 10.1016/j.ecoenv.2020.111842. Epub 2021 Jan 8.
Microplastics (MPs) and halogenated organic pollutants coexist in ambient water and MPs tend to sorb organic pollutants from surrounding environments. Herein, a study on the sorption behavior of tetrabromobisphenol-A (TBBPA) onto four different MPs, namely, polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC) was carried out. Effects of MPs properties and environmental factors, including the type, surface charge and pore volume as well as the ionic strength (Ca) and humic acid (HA) on the sorption of TBBPA were discussed. Results showed that the sorption of TBBPA onto the MPs could reached an equilibrium within 24 h, and the sorption capacities decreased in the following order -PVC (101.85 mg kg) >PS (78.95 mg kg) >PP (58.57 mg kg) >PE (49.43 mg kg). Adsorption kinetics data fitted by intraparticle diffusion model revealed both surface sorption and intraparticle diffusion contributed, in the interfacial diffusion stage approximately 11-29% of TBBPA slowly diffused onto the surface of the MPs, and finally, in the intraparticle diffusion stage. The increase of Ca concentration could promote the sorption of TBBPA by PE, PP, and PS, but no significant alteration for PVC. For all the four MPs, HA was found to exert a negative effect on TBBPA sorption. The adsorption was mainly driven by hydrophobic partition and electrostatic interactions.
微塑料（MPs）和卤代有机污染物共存于环境水中，MPs 倾向于从周围环境中吸附有机污染物。本文研究了四种类别 MPs（聚乙烯（PE）、聚丙烯（PP）、聚苯乙烯（PS）和聚氯乙烯（PVC））对四溴双酚 A（TBBPA）的吸附行为。讨论了 MPs 特性和环境因素（包括类型、表面电荷和孔体积以及离子强度（Ca）和腐殖酸（HA））对 TBBPA 吸附的影响。结果表明，TBBPA 在 MPs 上的吸附可在 24 小时内达到平衡，吸附容量按以下顺序降低：-PVC（101.85mgkg）>PS（78.95mgkg）>PP（58.57mgkg）>PE（49.43mgkg）。由颗粒内扩散模型拟合的吸附动力学数据表明，表面吸附和颗粒内扩散都起作用，在界面扩散阶段，约 11-29%的 TBBPA 缓慢扩散到 MPs 的表面，最后进入颗粒内扩散阶段。Ca 浓度的增加可以促进 TBBPA 在 PE、PP 和 PS 上的吸附，但对 PVC 没有明显影响。对于所有四种 MPs，均发现腐殖酸对 TBBPA 的吸附有负面影响。吸附主要由疏水性分配和静电相互作用驱动。
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