Comparing the sorption of pyrene and its derivatives onto polystyrene microplastics: Insights from experimental and computational studies. (December 2021)

• Record Type: Journal Article
• Authors: Yang, Chenghu; Wu, Wei; Zhou, Xiaotian; Hao, Qing; Li, Tiejun; Liu, Yangzhi
• Is Part Of: Marine pollution bulletin. Volume 173:Part B(2021)
• Publication Date: 2021-12
• Subjects: Microplastics -- Polycyclic aromatic hydrocarbons -- Sorption -- Pyrene -- Substituent; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2021.113086
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: In this study, the sorption behaviors and mechanisms between polystyrene microplastics (micro-PS) and 4-rings polycyclic aromatic hydrocarbons (PAHs) pyrene (Pyr) and its derivatives (S-Pyr), including 1-methylpyrene (P-CH3 ), 1-hydroxypyrene (P-OH), 1-aminopyrene (P-NH2 ), 1-pyrenecarboxylic acid (P-COOH) were investigated at neutrality. The results revealed that the sorption rates of micro-PS for S-Pyr were higher than those for parent Pyr. Meanwhile, -CH3 could slightly facilitate the sorption, whereas -OH, P-NH2, and P-COOH intensively inhibit the sorption of S-Pyr onto micro-PS. The sorption capacities of Pyr/S-Pyr increased with decreasing size of micro-PS. Besides, the effects of salinity and temperature on the sorption characteristics of micro-PS for Pyr/S-Pyr depended on their substituents. Combined with experimental and computational methods, it could be concluded that the main sorption mechanisms were possibly hydrophobic interaction, π-π interaction and pore-filling. The observations reported here could improve predictions of environmental behaviors and bioavailability of PAHs and micro-PS. Graphical abstract: Unlabelled Image Highlights: Sorption of Pyr/S-Pyr on PS was studied by experimental and computational methods. Sorption of S-Pyr with PS is dependent on the substituents of Pyr. Sorption of Pyr/S-Pyr changes with the size of PS, temperature and salinity. Hydrophobic and π-π interactions and pore-filling are main mechanisms for sorption.