The degradation of polylactic acid face mask components in different environments

被引:4
作者
Lyu, Linxiang [1 ]
Bagchi, Monisha [2 ]
Ng, Kelvin Tsun Wai [3 ]
Markoglou, Nektaria [2 ]
Chowdhury, Rumpa [3 ]
An, Chunjiang [1 ]
Chen, Zhikun [1 ]
Yang, Xiaohan [1 ]
机构
[1] Concordia Univ, Dept Bldg Civil & Environm Engn, Montreal, PQ H3G 1M8, Canada
[2] Meltech Innovat Canada Inc, Dept Res & Dev, Medicom Grp, Pointe Claire, PQ H9P 2Z2, Canada
[3] Environm Syst Engn, 3737 Wascana Pkwy, Regina, SK S4S 0A2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Polylactic acid face masks; Degradation; Microparticles; Enzyme degradation; Process and mechanism; Sustainability; HYDROLYTIC DEGRADATION; POLY(LACTIC ACID); PLA;
D O I
10.1016/j.jenvman.2024.122731
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The disposal of fossil fuel-based plastics poses a huge environmental challenge, leading to increased interest in biodegradable alternatives such as polylactic acid (PLA). This study focuses on the environmental impact and degradation of PLA face mask components under various conditions (UV (Ultraviolet) radiation, DI water, landfill leachate of various ages, seawater, and enzyme). Under UV exposure, notable changes in physicochemical properties were observed in the PLA masks, including increased oxidation over time. Degradation rates varied across environments, with old landfill leachate and enzyme degradation having a notable impact, especially on meltblown layers. Furthermore, it was found that seawater conditions hampered the degradation of PLA masks, likely due to the inhibitory effect of high salt concentrations. The pathways of chemical group changes during degradation were elucidated using 2D-COS (Two-Dimensional Correlation Spectroscopy) maps. The investigation into the release of microparticles and oligomers further revealed the degradation mechanism. Moreover, PLA masks were found to release fewer microparticles when degraded in studied environments when compared to traditional polypropylene masks. Furthermore, correlation analysis highlighted the influence of factors such as carbonyl index and contact angle on degradation rates, underscoring the complex interplay between environmental conditions and PLA degradation. This comprehensive investigation advances the understanding of PLA degradation pathways, which are crucial for mitigating plastic pollution and promoting the development of sustainable products.
引用
收藏
页数:14
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