Insights into the photoaging behavior of biodegradable and nondegradable microplastics: Spectroscopic and molecular characteristics of dissolved organic matter release

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Xiaoyang Wu , Yifan Liu , Yaofeng Jin , Yue Wang , Mengjie Yuan , Kunyu He , Xiaoyan Zhang , Qin Chen , Zhijing Xue , Rui Wang , Xiaoyun Li
{"title":"Insights into the photoaging behavior of biodegradable and nondegradable microplastics: Spectroscopic and molecular characteristics of dissolved organic matter release","authors":"Xiaoyang Wu ,&nbsp;Yifan Liu ,&nbsp;Yaofeng Jin ,&nbsp;Yue Wang ,&nbsp;Mengjie Yuan ,&nbsp;Kunyu He ,&nbsp;Xiaoyan Zhang ,&nbsp;Qin Chen ,&nbsp;Zhijing Xue ,&nbsp;Rui Wang ,&nbsp;Xiaoyun Li","doi":"10.1016/j.jhazmat.2024.136651","DOIUrl":null,"url":null,"abstract":"<div><div>Biodegradable plastics are increasingly used as a potential alternative to nondegradable plastics to tackle plastic pollution. However, recent studies have raised concerns about the ecological risks posed by biodegradable microplastics (MPs), which mainly focused on the risks generated by MPs themselves, neglecting the risks associated with the MPs derived dissolved organic matter (DOM). Therefore, this study selected polylactic acid (PLA) MPs with 50 µm particle size and polystyrene (PS) MPs with 50 µm and 500 nm particle sizes as representatives of biodegradable and nondegradable MPs, respectively, to comparative investigate their photoaging behavior, particularly the differences in DOM release. The results showed that both PLA-MPs and PS-MPs exhibited considerable photoaging under ultraviolet irradiation, accompanied by different color changes (PS turned yellow and PLA turned grayish brown), which were attributed to the different functional groups produced on their surfaces after photoaging (PS-MPs: C<img>O, PLA-MPs: terminal –COOH). Additionally, excitation-emission matrix characterization combined with parallel factor analysis revealed that 50 µm PLA-MPs (16–23 %) released more protein-like low molecular weight DOM during photoaging than that of both 50 µm PS-MPs (7–13 %) and 500 nm PS-MPs (8–18 %). Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS) further confirmed that PLA-MPs (41.4 %) produced more unstable DOM easily utilized by microorganisms than that of 50 µm PS-MPs (6.3 %) and 500 nm PS-MPs (7.9 %). These results together suggested that biodegradable MPs with small particle size derived DOM may have a greater impact on microbial activity and carbon cycle than that of nondegradable MPs.</div></div>","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"483 ","pages":"Article 136651"},"PeriodicalIF":12.2000,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Hazardous Materials","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304389424032321","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0

Abstract

Biodegradable plastics are increasingly used as a potential alternative to nondegradable plastics to tackle plastic pollution. However, recent studies have raised concerns about the ecological risks posed by biodegradable microplastics (MPs), which mainly focused on the risks generated by MPs themselves, neglecting the risks associated with the MPs derived dissolved organic matter (DOM). Therefore, this study selected polylactic acid (PLA) MPs with 50 µm particle size and polystyrene (PS) MPs with 50 µm and 500 nm particle sizes as representatives of biodegradable and nondegradable MPs, respectively, to comparative investigate their photoaging behavior, particularly the differences in DOM release. The results showed that both PLA-MPs and PS-MPs exhibited considerable photoaging under ultraviolet irradiation, accompanied by different color changes (PS turned yellow and PLA turned grayish brown), which were attributed to the different functional groups produced on their surfaces after photoaging (PS-MPs: CO, PLA-MPs: terminal –COOH). Additionally, excitation-emission matrix characterization combined with parallel factor analysis revealed that 50 µm PLA-MPs (16–23 %) released more protein-like low molecular weight DOM during photoaging than that of both 50 µm PS-MPs (7–13 %) and 500 nm PS-MPs (8–18 %). Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS) further confirmed that PLA-MPs (41.4 %) produced more unstable DOM easily utilized by microorganisms than that of 50 µm PS-MPs (6.3 %) and 500 nm PS-MPs (7.9 %). These results together suggested that biodegradable MPs with small particle size derived DOM may have a greater impact on microbial activity and carbon cycle than that of nondegradable MPs.

Abstract Image

透视可生物降解和不可降解微塑料的光老化行为:溶解有机物释放的光谱和分子特征
生物降解塑料越来越多地被用作不可降解塑料的潜在替代品,以解决塑料污染问题。然而,最近的一些研究引起了人们对生物可降解塑料(MPs)所带来的生态风险的关注,这些研究主要集中在 MPs 本身所产生的风险上,而忽略了 MPs 衍生的溶解有机物(DOM)所带来的风险。因此,本研究选取了粒径为 50 μm 的聚乳酸(PLA)微塑料和粒径为 50 μm 和 500 nm 的聚苯乙烯(PS)微塑料,分别作为可降解和不可降解微塑料的代表,比较研究它们的光老化行为,尤其是 DOM 释放量的差异。结果表明,聚乳酸-MPs 和聚苯乙烯-MPs 在紫外线照射下都表现出明显的光老化现象,并伴随着不同的颜色变化(聚苯乙烯变成黄色,聚乳酸变成灰褐色),这归因于光老化后它们表面产生了不同的官能团(聚苯乙烯-MPs:C=O,聚乳酸-MPs:末端 -COOH)。此外,激发-发射矩阵表征结合平行因子分析发现,50 μm 聚乳酸-MPs(16%-23%)在光老化过程中释放出的蛋白质类低分子量 DOM 比 50 μm PS-MPs (7%-13%)和 500 nm PS-MPs (8%-18%)都要多。傅立叶变换离子回旋共振质谱分析法(FT-ICR-MS)进一步证实,聚乳酸-MPs(41.4%)比 50 μm PS-MPs (6.3%)和 500 nm PS-MPs (7.9%)产生更多易于被微生物利用的不稳定 DOM。这些结果表明,与不可降解的 MPs 相比,粒径较小的可生物降解的 MPs 产生的 DOM 对微生物活动和碳循环的影响可能更大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信