微塑料对河流悬浮沉积物吸附氯酚的影响。

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Shiqi Tao, Simin Feng, Yuyun Chen, Ting Duan, Zengyu Liu, Ling Li, Rongrong Yun, Chayma Chilouch
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引用次数: 0

摘要

尽管微塑料(MPs)被广泛认为是环境污染物的载体,但它们对河流悬浮沉积物(SS)吸附氯酚(CPs)行为的影响仍知之甚少。本研究系统研究了三种常见的聚氯乙烯(PVC)、聚苯乙烯(PS)和聚乙烯(PE)对黄河SS吸附4-氯酚(MCP)、2,4-二氯酚(2,4- dcp)和2,4,6-三氯酚(2,4,6- tcp)的影响。吸附等温线结果表明,聚氯乙烯对CP的吸附效果较好,符合Langmuir模型(R²> 0.95),而PS和PE对Freundlich模型的吸附效果较好(R²> 0.96)。不同MP类型和CP品种的增强效果不同,其中PVC的增强效果最明显(2,4,6- tcp增强了65%)。相反,PS和PE在SS中的分配系数(36.83±6.3 L/kg)高于MPs (PS为1.85±0.01 L/kg, PE为2.03±0.05 L/kg),从而阻碍了2,4- dcp的吸附。环境因素分析表明,离子强度具有双重作用,首先通过降低溶解度增强CP吸附,然后通过静电斥力抑制CP吸附。腐植酸(HA)通过在SS表面的聚集和分散机制促进TCP的吸附,抑制DCP的吸附。酸性条件(pH 2-6)通过维持分子状态显著增强CP吸附,而碱性条件由于静电斥力降低吸附。从机理上讲,MPs改变了SS的表面性质,形成了有利于或竞争CP吸附位点的聚集体。本研究为含沙河流微塑料-污染物复合污染的生态风险评价提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Impact of Microplastics on Adsorption of Chlorophenols by River-Suspended Sediments

Although microplastics (MPs) are widely recognized as carriers of environmental pollutants, their impact on the adsorption behavior of chlorophenols (CPs) by river-suspended sediments (SS) remains poorly understood. This study systematically investigated the effects of three common MPs (PVC, PS, and PE) on the adsorption of 4-chlorophenol (MCP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) by SS from the Yellow River. Adsorption isotherms revealed that PVC significantly promoted CP adsorption, fitting well with the Langmuir model (R² > 0.95), whereas PS and PE showed better agreement with the Freundlich model (R² > 0.96). The enhancement effect varied with MP type and CP species, with PVC demonstrating the most pronounced promotion (65% increase for 2,4,6-TCP). Conversely, PS and PE hindered 2,4-DCP adsorption due to its higher partition coefficient in SS (36.83 ± 6.3 L/kg) compared to MPs (1.85 ± 0.01 L/kg for PS and 2.03 ± 0.05 L/kg for PE). Environmental factor analysis revealed that ionic strength exerted dual effects by initially enhancing CP adsorption through reduced solubility and later inhibiting it via electrostatic repulsion. Humic acid (HA) promoted TCP adsorption but inhibited DCP adsorption through aggregation and dispersal mechanisms on SS surfaces. Acidic conditions (pH 2–6) significantly enhanced CP adsorption by maintaining their molecular states, while alkaline conditions reduced adsorption due to electrostatic repulsion. Mechanistically, MPs altered SS surface properties and formed aggregates that either facilitated or competed for CP adsorption sites. This study provides a theoretical basis for ecological risk assessment of combined microplastic-pollutant contamination in sediment-laden rivers.

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来源期刊
Environmental Management
Environmental Management 环境科学-环境科学
CiteScore
6.20
自引率
2.90%
发文量
178
审稿时长
12 months
期刊介绍: Environmental Management offers research and opinions on use and conservation of natural resources, protection of habitats and control of hazards, spanning the field of environmental management without regard to traditional disciplinary boundaries. The journal aims to improve communication, making ideas and results from any field available to practitioners from other backgrounds. Contributions are drawn from biology, botany, chemistry, climatology, ecology, ecological economics, environmental engineering, fisheries, environmental law, forest sciences, geosciences, information science, public affairs, public health, toxicology, zoology and more. As the principal user of nature, humanity is responsible for ensuring that its environmental impacts are benign rather than catastrophic. Environmental Management presents the work of academic researchers and professionals outside universities, including those in business, government, research establishments, and public interest groups, presenting a wide spectrum of viewpoints and approaches.
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