水生环境中纳米塑料和悬浮沉积物异质聚集的光照诱导变化：纳米聚苯乙烯案例研究

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2024-11-06 DOI:10.1016/j.watres.2024.122762

Dan Luo , Chang Li , Xue Bai , Yi Shi , Ruifeng Wang

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引用次数: 0

摘要

纳米塑料（NPs）的光老化和与悬浮沉积物（SS）的异质聚集决定了 NPs 在水生环境中的迁移过程和生态风险。本研究探讨了光老化对不同价态电解质溶液中聚苯乙烯 NPs（PSNPs）与悬浮物异质聚集行为的干扰，并结合聚集动力学和分子动力学（MD）模拟推导了其相互作用机理。电解质浓度的增加显著增强了聚苯乙烯纳米粒子和聚苯乙烯砜之间的异质聚集，二价电解质诱导异质聚集的效率更高。分子水平上的 MD 模拟显示，PS 和 SS 可自发形成团簇，光老化 PS 与 SS 折叠成致密状态的潜力更大。由于 NaCl 溶液中浸出有机物产生的立体阻碍作用，光照 30 d 可延缓异聚，临界凝结浓度（CCC）提高了 85.44% 以上。相反，在 CaCl2 溶液中，光aging 通过 Ca2+ 桥接作用使 PSNPs 表面产生更多含氧官能团，促进异聚，从而破坏稳定性，CCC 降低了 23.53% ∼ 35.29%。这些发现从机理上揭示了 NPs 和 SS 的环境过程，对于全面了解 NPs 在水生环境中的环境归宿和迁移至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene

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Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene

Photoaging of nanoplastics (NPs) and heteroaggregate with suspended sediments (SS) determines transport processes and ecological risks of NPs in aquatic environments. This study investigated the disruption of photoaging on the heteroaggregation behavior of polystyrene NPs (PSNPs) and SS in different valence electrolyte solutions and deduced the interaction mechanisms by integrating aggregation kinetics and molecular dynamics (MD) simulation. Increasing the electrolyte concentration significantly enhanced the heteroaggregation between PSNPs and SS, and the divalent electrolytes induced the heteroaggregation more efficiently. MD simulation at the molecular level revealed that PS and SS could spontaneously form clusters, and photoaged PS has a stronger potential to fold into a dense state with SS. Photoaging for 30 d retarded heteroaggregation due to the steric hindrance produced by the leached organic matter in NaCl solutions, and the critical coagulation concentration (CCC) increased by >85.44 %. Contrarily, photoaging caused more oxygen-containing functional groups produced on the surface of PSNPs through Ca²⁺ bridging promoting heteroaggregation and thus destabilizing in CaCl₂ solutions, the CCC decreased by 23.53 % ∼ 35.29 %. These findings provide mechanistic insight into the environmental process of NPs and SS and are crucial for a comprehensive understanding of the environmental fate and transport of NPs in aquatic environments.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.