生态电晕包覆纳米塑料在沿海沉积物中的迁移

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

Water Research Pub Date : 2025-05-24 DOI:10.1016/j.watres.2025.123893

Xia Liu , Rubi Zhao , Muhan Liu , Tianyuan Zheng , Yujie Hao , Chu Wang , Lu Liu , Yating Zhao , Zhuomiao Liu , Yanhui Dai , Tongtao Yue , Jian Zhao , Zhenyu Wang , Baoshan Xing

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引用次数: 0

摘要

运输是了解纳米塑料在海洋环境中的命运和风险的关键过程。本文研究了不同表面性质的聚苯乙烯NPs在海洋沉积物中的垂直迁移。成功合成了两种具有不同疏水性的pd掺杂NPs (PS-Pd, 100 nm)，两种NPs均表现出弱且不显著的迁移，最大流出物浓度与进水物浓度（Meff）之比为10% ~ 11%。这主要是由于两种NPs的物理应变，这是由强聚集引起的，正如平流-弥散模式所证实的那样。两种功能化NPs （PS-COOH和PS-NH2）在海洋沉积物中表现出较强的输运性，主要是由于物理应变较弱。带负电荷且疏水性较差的PS-COOH NPs比PS-NH2 NPs表现出更强的输运（Meff, 43%）。异聚集实验和TEM-EDS图谱表明，PS-COOH与有机物的弱疏水相互作用和与矿物的静电吸引是PS-NH2输运率高于PS-NH2的主要原因。NPs上生态电晕的形成抑制了PS-COOH NPs的转运。然而，生态电晕增强了PS-NH2 NPs输运（Meff, 20±5%），因为静电吸引力降低。有趣的是，对于两种PS-Pd NPs，生态电晕涂层后的运输表现不同，亲水性PS-Pd-1的运输减少是由于疏水相互作用的增加，而疏水性PS-Pd-2的运输增加是由于沉积物中物理张力的减弱。这些结果揭示了海洋沉积物中NPs的运移机制，并强调了生态日冕在NPs的命运和过程中的关键作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Transport of eco-corona coated nanoplastics in coastal sediments

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Transport of eco-corona coated nanoplastics in coastal sediments

Transport is a critical process for understanding the fate and risk of nanoplastics (NPs) in marine environments. In this work, vertical transport of polystyrene (PS) NPs with different surface properties in marine sediments were investigated. Two types of Pd-doped (PS-Pd, 100 nm) NPs with distinct hydrophobicity were successfully synthesized, and both types of NPs showed weak and insignificant transport, with ratio of maximum effluent to influent NPs concentrations (M_eff) at 10 %-11 %. This is mainly due to physical straining of both NPs as caused by strong aggregation as confirmed by advection-dispersion modelling. Two functionalized NPs (PS-COOH and PS-NH₂) showed strong transport in marine sediment, mainly because of weak physical straining. Negatively charged and less hydrophobic PS-COOH NPs exhibited stronger transport (M_eff, 43 %) than PS-NH₂ NPs (M_eff, 15 %). Heteroaggregation experiments and TEM-EDS mapping demonstrated that weak hydrophobic interaction with organic matter and electrostatic attraction with minerals were the main reasons for higher transport of PS-COOH than PS-NH₂. The formation of eco-corona on NPs inhibited the transport of PS-COOH NPs. However, eco-corona enhanced PS-NH₂ NPs transport (M_eff, 20 ± 5 %) because of decreased electrostatic attraction. Interestingly, for the two PS-Pd NPs, the transport performed differently after eco-corona coating, in which the transport of hydrophilic PS-Pd-1 decreased after eco-corona coating due to increased hydrophobic interaction, while the increased transport of hydrophobic PS-Pd-2 was caused by weakened physical straining in sediments. These results provide insight into transport mechanism of NPs, and highlight critical roles of eco-corona in the fate and processes of NPs in marine sediments.

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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.