电化学-氧化二元论：湖水老化轮胎磨损颗粒对周围植物生物膜介导的反硝化的急性效应解耦

IF 7.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-07-23 DOI:10.1016/j.envpol.2025.126876

Kun Li , Zhangle Chen , Wanqi Hao

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引用次数: 0

摘要

轮胎磨损颗粒作为新兴的微塑料污染物，对水生氮循环的光化学影响尚不清楚。本研究研究了三种类型的twps——通过滚动（R-TWPs）、滑动（S-TWPs）和低温破碎（C-TWPs）机械产生的twps——以及它们的老化对应物（AC-、AR-、AS-TWPs）如何影响周围植物生物膜中硝酸盐的还原。湖水的老化改变了TWPs的表面性质：AC-和AR-TWPs积累了无机离子和有机涂层，而AS-TWPs促进了微生物的定植。老化TWPs表现出电子交换能力（EEC）增强和环境持久性自由基（EPFRs）水平升高。然而，新鲜和陈化的TWPs都没有以剂量依赖的方式改变硝酸盐去除，反硝化基因丰度（nirK, nirS）或微生物群落结构；它们的影响与EEC或epfr没有简单的相关性。在光照下，TWPs充当电子穿梭体，传递光生电子。猝灭羟基自由基（·OH）表明EEC（特别是供电子和接受电子能力）与硝酸盐去除率之间存在很强的正相关关系(r = 0.928-0.957, p <；0.01)。方差划分分析发现，EPFRs是反硝化的启动子（贡献值为0.16），·OH是抑制子（贡献值为-0.18）。在1.0 ~ 50.0 mg L-1、7 d的浓度下，TWPs对城市河流氮循环的影响是矛盾的。这种矛盾源于表面活性成分（如炭黑、氧化锌）和光敏成分（如epfr、氧化还原官能团）之间的协同相互作用。这项工作强调了光活性twp在调节水生氮循环中的双重作用，并强调了在评估城市水系微塑料污染时评估其光化学反应性和氧化应激效应的必要性。

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Electrochemical-oxidative dualism: Decoupling the acute effects of lake water-aged tire wear particles on periphytic biofilm-mediated denitrification

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Electrochemical-oxidative dualism: Decoupling the acute effects of lake water-aged tire wear particles on periphytic biofilm-mediated denitrification

As emerging microplastic pollutants, tire wear particles (TWPs) have unclear photochemical impacts on aquatic nitrogen cycles. This study investigated how three types of TWPs—mechanically generated via rolling (R-TWPs), sliding (S-TWPs), and low-temperature crushing (C-TWPs)—and their aged counterparts (AC-, AR-, AS-TWPs) influenced nitrate reduction in periphytic biofilms. Aging in lake water altered the surface properties of TWPs: AC- and AR-TWPs accumulated inorganic ions and organic coatings, while AS-TWPs facilitated microbial colonization. Aged TWPs exhibited enhanced electron exchange capacity (EEC) and elevated levels of environmentally persistent free radicals (EPFRs). However, neither fresh nor aged TWPs altered nitrate removal, denitrification gene abundance (nirK, nirS), or microbial community structure in a dose-dependent manner; their impacts showed no simple correlation with EEC or EPFRs. Under illumination, TWPs acted as electron shuttles, transferring photogenerated electrons. Quenching hydroxyl radicals (·OH) revealed a strong positive correlation between EEC (specifically, electron donating and accepting capacities) and nitrate removal rates (r = 0.928–0.957, p < 0.01). Variance partitioning analysis identified EPFRs as promoters (contribution: 0.16) and ·OH as inhibitors (contribution: −0.18) of denitrification. At concentrations of 1.0–50.0 mg L⁻¹ over 7 days, TWPs exerted paradoxical effects on urban river nitrogen cycling. This paradox arose from synergistic interactions between surface-active components (e.g., carbon black, zinc oxide) and photosensitive moieties (e.g., EPFRs, redox functional groups). This work highlights the dual role of photoactive TWPs in modulating aquatic nitrogen cycles and underscores the necessity of evaluating their photochemical reactivity and oxidative stress effects when assessing microplastic pollution in urban water systems.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.