Accelerated aging behavior of degradable and non-degradable microplastics via advanced oxidation and their adsorption characteristics towards tetracycline.
Ecotoxicol Environ Saf
; 284: 116864, 2024 Aug 12.
Article
em En
| MEDLINE
| ID: mdl-39137460
ABSTRACT
The increasing global utilization of biodegradable plastics due to stringent regulations on traditional plastics has caused a significant rise in microplastic (MPs) pollution in aquatic ecosystems from biodegradable products. However, the environmental behavior of biodegradable MPs remains inadequately elucidated. This study explored the aging processes of polylactic acid (PLA) and polystyrene (PS) under a heat-activated potassium persulfate (K2S2O8) system, as well as their adsorption characteristics towards tetracycline (TCs). In comparison to PS, the surface structure of PLA experienced more pronounced changes over aging, exhibiting evident pits, cracks, and fragmentation. The carbonyl index (CI) and oxygen/carbon ratio (O/C) of PS displayed exponential growth over time, whereas the values for PLA showed linear and exponential increases, respectively. The adsorption capacity of TCs by PS and PLA aged for 6 days increased from 0.312â¯mgâ§g-1 and 0.457â¯mgâ§g-1for original PS and PLA, respectively, to 0.372â¯mgâ§g-1 and 0.649â¯mgâ§g-1. Meanwhile, the adsorption rate (k2 values) for TCs decreased by 42.03â¯% for PS and 79.64â¯% for PLA compared to their initial values. The findings indicated that biodegradable PLA-MPs may exhibit higher tetracycline carrying capacities than PS, potentially increasing environmental and organismal risks, particularly in view of aging effects.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Ecotoxicol Environ Saf
Ano de publicação:
2024
Tipo de documento:
Article