Environmental Chemistry and Ecotoxicology最新文献_第4页

Assessment of sustainable development based on source apportionment of hazardous elements and cost-effectiveness analysis in a watershed hosting two world-class industrial clusters 在拥有两个世界级工业集群的流域中，基于有害元素来源分配和成本效益分析的可持续发展评价

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2026-01-01 DOI: 10.1016/j.enceco.2026.01.001

Yongzhong Lai , Jiezhang Mo , Li Xiang , Zhao Lin , Zhipeng Huang , Hongzhi Zhao , Ran Bi , Wenhua Liu , Jingchun Shi , Ming Hung Wong

Industrial agglomeration in watersheds poses a significant challenge for accurately identifying pollution sources and effective environmental management. This study focused on a representative watershed hosting two world‑leading industrial centers: textile dyeing and printing, and e-waste recycling. Surface sediments were collected along the mainstream and tributaries, namely Beigang, Old Lianjiang, Chendian, Jinxi, Qiufeng, Xiashan, and Zhonggang rivers. Concentrations of hazardous elements (e.g., Cu, Sb, Cd, Pb, Hg, As) were quantified. The potential ecological risk index (RI) indicated that over 50 % of sampling sites posed high or extreme ecological risk, primarily associated with zones of intensive e-waste recycling and textile industrial discharge. We employed a combination of models with different principles to accurately apportion sources, including positive matrix factorization (PMF), principal component analysis (PCA), and correlation analysis. Results revealed that anthropogenic sources—e-waste recycling activities (characterized by Cu), textile wastewater (characterized by Sb), and urban non-point source pollution—were the dominant contributors, accounting for up to 70 % of the pollutant loads. The source profiles were further validated by comparing them with typical sludge samples from industrial facilities, confirming the distinct chemical fingerprints of each source. Notably, a cost-effectiveness analysis underscored the unsustainability of this development model: 0.48 USD per 1 USD of industrial added value were generated in latent environmental debt, primarily from ecosystem service degradation and remediation costs. This study provides a robust framework for source apportionment in complex industrial basins. It highlights the urgent need for targeted pollution control strategies in high-risk industries to mitigate environmental and economic losses.

流域工业集聚对污染源的准确识别和有效的环境管理提出了重大挑战。本研究的重点是一个具有代表性的流域，该流域拥有两个世界领先的工业中心：纺织印染和电子废物回收。表层沉积物主要分布在北岗、老连江、陈店、锦溪、秋峰、下山、中岗等干支流。对有害元素（如Cu、Sb、Cd、Pb、Hg、As）的浓度进行了量化。潜在生态风险指数（RI）表明，超过50%的采样点具有高度或极端生态风险，主要与电子废物集约回收区和纺织工业排放区有关。我们采用不同原理的模型组合，包括正矩阵分解（PMF）、主成分分析（PCA）和相关分析，以准确地分配来源。结果表明，电子垃圾回收活动（以Cu为特征）、纺织废水（以Sb为特征）和城市非点源污染是主要污染源，占污染物负荷的70%。通过与来自工业设施的典型污泥样本进行比较，进一步验证了来源概况，确认了每个来源的独特化学指纹。值得注意的是，成本效益分析强调了这种发展模式的不可持续性：每1美元工业增加值产生0.48美元的潜在环境债务，主要来自生态系统服务退化和修复成本。该研究为复杂工业盆地的源分配提供了一个强有力的框架。报告强调，迫切需要在高风险行业制定有针对性的污染控制战略，以减轻环境和经济损失。

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引用次数: 0

Multimedia distribution and ecological risks of bisphenol a in the Arctic Ocean: Insights from the east Siberian and Chukchi seas 北冰洋双酚a的多媒体分布和生态风险：来自东西伯利亚海和楚科奇海的见解

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2026-01-01 DOI: 10.1016/j.enceco.2026.01.011

Jiapeng Yuan , Minggang Zheng , Fengmei Wang , Yiling Li , Aifeng Liu , Xinyu Li , Yitong Liu , Lei Shi , Ling Wang

Bisphenol A (BPA), a widely used chemical and known endocrine-disrupting chemical (EDC), has estrogen activity and the ability to migrate over long distances, which could pose a potential threat to polar ecosystems. This study examines the pollution levels, degradation mechanisms, and ecological risks of BPA and its analogs in the southeastern Arctic Ocean, focusing on the East Siberian and Chukchi Seas, through systematic sampling and analysis of seawater, suspended particulate matter (SPM), and sediment cores collected during the 2023 Arctic scientific cruise. BPA concentrations in surface seawater ranged from below the detection limit to 23.19 ng/L, with higher levels near the Beaufort Gyre. BPA levels in SPM (106.72–2864.50 ng/g dw) were significantly higher than in sediments (10.06–70.49 ng/g dw), identifying SPM as a primary transport vector. Sediment core analysis showed a historical rise in BPA deposition since the 1950s, aligning with the growth of BPA production industries. Ecological risk assessments using Risk Quotient (RQ) values indicated a high risk to marine organisms under current conditions, although lower-trophic-level species, such as Daphnia magna, showed increased vulnerability. This work offers essential data for understanding BPA's environmental fate in the Arctic Ocean and highlights the need for long-term monitoring and interdisciplinary research to address the ongoing presence and ecological risks of BPA amid its increasing global use.

双酚A （BPA）是一种广泛使用的化学物质和已知的内分泌干扰化学物质（EDC），具有雌激素活性和长距离迁移能力，可能对极地生态系统构成潜在威胁。本研究通过对2023北极科学巡航期间收集的海水、悬浮颗粒物（SPM）和沉积物岩心进行系统采样和分析，研究了北冰洋东南部双酚a及其类似物的污染水平、降解机制和生态风险，重点是东西伯利亚海和楚科奇海。表层海水中的BPA浓度从低于检测限到23.19 ng/L不等，波弗特环流附近的水平更高。SPM中BPA含量（106.72 ~ 2864.50 ng/g dw）显著高于沉积物（10.06 ~ 70.49 ng/g dw），表明SPM是主要的转运载体。沉积物岩心分析显示，自20世纪50年代以来，BPA沉积呈历史上升趋势，与BPA生产工业的增长相一致。利用风险商（RQ）值进行的生态风险评估表明，在当前条件下，海洋生物面临较高的风险，尽管低营养水平的物种（如大水蚤）表现出更高的脆弱性。这项工作为了解双酚a在北冰洋的环境命运提供了必要的数据，并强调了长期监测和跨学科研究的必要性，以解决双酚a在全球使用日益增加的情况下的持续存在和生态风险。

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引用次数: 0

A semi-enclosed bay as a pharmaceutical hotspot and an open strait as a regional reservoir: Contrasting pharmaceuticals and antibiotic resistance 半封闭海湾作为药物热点和开放海峡作为区域水库：对比药物和抗生素耐药性

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2026-01-01 DOI: 10.1016/j.enceco.2025.12.022

Xiaohan Yin , Yijing Yang , Jianqiang Su , Yue Wu , Yuxuan Huang , Yongyu Li , Xinhong Wang

Pharmaceuticals and antibiotic resistance genes (ARGs) are increasingly recognized as emerging pollutants in coastal ecosystems, yet their contrasting behaviors in open straits versus semi-enclosed bays remain poorly understood. Here, we determined their concentrations across various sampling sites and seasons, together with mobile genetic elements (MGEs), in different water layers of the western Taiwan Strait and Dongshan Bay. In the Taiwan Strait, pharmaceutical concentrations were relatively low (0.60–81.20 ng/L), yet ocean currents may have played a pivotal role in redistributing both chemical and genetic pollutants. Despite the absence of corresponding antibiotics, multiple ARG classes (multidrug, aminoglycoside, MLSB) persisted, with strong correlations to transposase genes, underscoring the overlooked role of offshore waters as active reservoirs for horizontal gene transfer. In sharp contrast, Dongshan Bay—especially intensive aquaculture zones—exhibited substantially higher pharmaceutical levels (29.34–174.52 ng/L) and 74 ARGs dominated by multidrug resistance. Integrons (intI1) were tightly linked to diverse ARG classes, and ARG abundance correlated positively with antibiotic concentrations, directly implicating mariculture and terrestrial inputs as key drivers of resistance enrichment. Collectively, our findings reveal that semi-enclosed bays are vulnerable accumulators of anthropogenic contamination, while offshore straits serve as active pathways for pollutant redistribution and resistance propagation.

药物和抗生素抗性基因（ARGs）越来越被认为是沿海生态系统中的新污染物，但它们在开放海峡和半封闭海湾中的差异行为仍然知之甚少。在此，我们测定了它们在不同采样地点和季节的浓度，以及台湾海峡西部和东山湾不同水层的移动遗传元件（MGEs）。在台湾海峡，药物浓度相对较低（0.60-81.20 ng/L），但洋流可能在化学和遗传污染物的重新分配中发挥了关键作用。尽管缺乏相应的抗生素，但多种ARG类别（多药、氨基糖苷、MLSB）持续存在，与转座酶基因有很强的相关性，强调了近海水域作为水平基因转移的活跃储存库的被忽视的作用。与此形成鲜明对比的是，东山湾（特别是集约化养殖区）的药物含量明显较高（29.34 ~ 174.52 ng/L）， 74种ARGs以多药耐药为主。整合子（intI1）与多种ARG种类密切相关，ARG丰度与抗生素浓度呈正相关，直接表明海水养殖和陆地输入是抗性增强的关键驱动因素。总体而言，我们的研究结果表明，半封闭海湾是人为污染的脆弱蓄积体，而近海海峡则是污染物再分配和抗性传播的活跃途径。

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引用次数: 0

Gut and fecal microbial community responses of a marine copepod to micro(nano)plastics 海洋桡足动物肠道和粪便微生物群落对微（纳米）塑料的反应

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2026-01-01 DOI: 10.1016/j.enceco.2025.12.030

Zipei Dong , Wen-Xiong Wang

Micro(nano)plastic (MNP) pollution in the ocean raises concerns about their ecological risks. This study investigated the responses of gut and fecal microbiomes of a marine copepod Calanus sinicus to MNP exposure. Using aggregation-induced emission luminogen bacterial probes, we first visualized and quantified the bacterial distribution and abundance changes in copepod gut and fecal pellets following 200 μg/L of MP (5 μm) and NP (50 nm) exposure. Results revealed bacterial colonization in the anterior midgut, but MNPs induced significant increase in gut bacteria with a shift in gut/fecal balance. Specifically, the average fluorescence intensity of gut bacterial clusters increased by 51.8 % and 74.4 %, and conversely fecal bacterial abundance reduced by 41.4 % and 52.0 %, upon MP and NP exposure, respectively. Metagenomic sequencing revealed that MNP exposure resulted in reduced community diversity of fecal microbiome, characterized by decreased core groups and enriched plastic-associated genera. The most abundant Pseudophaeobacter decreased by 18.7–20.5 % under MNP exposure. Short-term MNP exposure had no major impact on KEGG pathways and CAZy classes, but significantly upregulated the MNP degradation-related functions, also disrupted the key genes involved in metabolism, oxidative stress, and biofilm formation. These findings provide key insights for the disturbance posed by MNPs to copepod guts and fecal microbiota.

海洋中的微（纳）塑料（MNP）污染引发了人们对其生态风险的担忧。本研究研究了海洋桡足动物Calanus sinicus肠道和粪便微生物组对MNP暴露的反应。利用聚集诱导发光细菌探针，我们首次观察并量化了200 μg/L MP （5 μm）和NP （50 nm）暴露后桡足动物肠道和粪便颗粒中细菌的分布和丰度变化。结果显示细菌定植在前中肠，但MNPs诱导肠道细菌显著增加，肠道/粪便平衡发生改变。具体来说，暴露于MP和NP后，肠道细菌簇的平均荧光强度分别增加了51.8%和74.4%，反之，粪便细菌丰度分别减少了41.4%和52.0%。宏基因组测序结果显示，MNP暴露导致粪便微生物群落多样性降低，其特征是核心群减少，塑料相关属增加。最丰富的假噬杆菌在MNP暴露下减少了18.7 - 20.5%。短期MNP暴露对KEGG通路和CAZy类别没有重大影响，但显著上调了MNP降解相关功能，也破坏了参与代谢、氧化应激和生物膜形成的关键基因。这些发现为MNPs对桡足动物肠道和粪便微生物群的干扰提供了关键的见解。

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引用次数: 0

Dual benefits of rotation crops: Root nematode suppression and pesticide remediation through biosolarization 轮作作物的双重效益：抑制根线虫和通过生物日光修复农药

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2026-01-01 DOI: 10.1016/j.enceco.2025.12.026

Marina Aliste , Caridad Ros , Isabel Garrido , Carmen María Martínez , Adriana Fuensanta Esteban , María Ángeles Hernández , Fulgencio Contreras , Pilar Flores , Pilar Hellín , José Fenoll

The dual use of rotation crops for suppressing Meloidogyne incognita (M. incognita) and their residues as organic matter amendments for pesticide remediation via biosolarization was investigated. Four plant species (mustard, radish, red clover, and sorghum) were evaluated for their response to M. incognita under controlled conditions using clay loam soil, with pepper as a susceptible control. Radish and sorghum exhibited low gall index and reproduction factor, indicating potential resistance or tolerance to root-knot nematodes (RKN). Fresh residues of these four species were also incorporated into historically contaminated agricultural soil at 5 % and 10 % (w/w) rates and subjected to biosolarization for 90 days under polyethylene covers. Soil temperature and physicochemical properties were monitored, and pesticide dissipation was assessed over time. In this soil, 15 pesticides were detected, with a cumulative concentration of 2.6 mg kg⁻¹. Biosolarization treatments enhanced pesticide dissipation compared to solarization alone and untreated control, with half-lives ranging from 52 to 120 days. Amendment type and rate influenced degradation efficiency, with low C/N ratio residues (mustard, radish, red clover) showing greater enhancement than high C/N ratio (sorghum). Higher amendment rates (10 % w/w) of radish and red clover significantly improved dissipation. In contrast to previous biosolarization studies that focused primarily on pathogen or pesticide control using conventional organic matter amendments (e.g., composts, manures, or agro-industrial wastes), this study demonstrates the use of rotation crop residues (selected for their nematode-suppressive potential) as functional biosolarization amendments. This integrated strategy links biological pest management with pesticide remediation, advancing the concept of biosolarization toward a more holistic and sustainable soil health approach.

研究了轮作作物在抑制隐密曲蝇方面的双重利用及其残留物作为生物光化学修复农药的有机质改良剂。以辣椒为敏感对照，在粘土壤土的控制条件下，评价了4种植物（芥菜、萝卜、红三叶草和高粱）对无头蚜的反应。萝卜和高粱对根结线虫（RKN）具有较低的瘿指数和繁殖因子，显示出潜在的抗性或耐受性。将这四种植物的新鲜残留物分别以5%和10% （w/w）的比例放入历史污染的农业土壤中，并在聚乙烯覆盖物下进行90天的生物日晒。监测土壤温度和理化性质，评估农药随时间的耗散。在该土壤中检测到15种农药，累积浓度为2.6 mg kg−1。与单独光照和未经处理的对照相比，生物光照处理增强了农药的耗散，半衰期从52天到120天不等。改良类型和速率影响降解效率，低碳氮比残留物（芥菜、萝卜、红三叶草）比高碳氮比残留物（高粱）有更大的增强。较高的修正率（10% w/w）显著改善了萝卜和红三叶草的耗散。与以往主要关注病原体或农药控制的生物日光化研究不同，该研究展示了轮作作物残留物（因其抑制线虫的潜力而被选中）作为功能性生物日光化修正物的使用。这一综合战略将生物虫害管理与农药补救联系起来，将生物日光化的概念推向更全面和可持续的土壤健康方法。

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引用次数: 0

Comprehensive chemical leaching, phytoremediation, organic amendment and nitrification inhibitor enhancing tailing soil remediation and ecosystem multifunctionality 综合化学淋滤、植物修复、有机改进剂和硝化抑制剂，增强尾砂土壤修复和生态系统的多功能性

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2026-01-01 DOI: 10.1016/j.enceco.2026.01.002

Manyun Zhang , Negar Omidvar , Fang Wang , Xinhong Gan , Jinfei Wu , Ning Li , Wenyuan Zhang , Tao Guo

Unreasonable mining and excavation of rare earth caused considerable threats to agricultural production and local ecology. This study explored the optimized combination of chemical leaching, phytoremediation, organic amendment and nitrification inhibitors to decline lead (Pb) contents in mining-affected soils but to enhance soil ecosystem multifunctionality. In comparison to control (CK) in the citric acid-leaching group, soil available Pb contents were significantly decreased by 15.7%, 17.5% and 18.4% in the ryegrass + camellia shell (RS), ryegrass + camellia shell + nitrification inhibitor dicyandiamide (RSDC) and ryegrass + camellia shell + nitrification inhibitor 3, 4-dimethylpyrazole phosphate (RSDM) treatments, respectively. Meanwhile, soil Firmicute ratios of the RS, RSDC and RSDM treatments were higher than those in the CK treatments, indicating that an increase in soil Firmicute ratio could improve soil health. Co-presences of shell and nitrification inhibitor significantly increased the height and weight of ryegrass in the double-distilled water and citric acid-leaching groups, and they also promoted soil ecosystem multifunctionality notably. Although the ryegrass did not survive in the citric acid and EDTA-2Na + citric acid-leaching groups, the shell amendment and nitrification inhibitor additions notably improved soil Shannon diversity indices and biotic community network stabilities. Soil pH, β-glucosidase, urease, microbial community diversity, Firmicute and Actinobacteriota ratios were negatively related to soil available Pb contents. Our study indicated that the combination of citric acid-leaching + ryegrass + organic shell + DCD was an optimal strategy for decreasing heavy metal risks and enhancing soil ecosystem health in abandoned mining areas.

不合理的稀土开采和挖掘对农业生产和当地生态造成了相当大的威胁。本研究探讨了化学浸出、植物修复、有机修复和硝化抑制剂的优化组合，以降低采动影响土壤中铅（Pb）的含量，同时增强土壤生态系统的多功能性。与对照（CK）相比，黑麦草+茶花壳（RS）、黑麦草+茶花壳+硝化抑制剂双氰胺（RSDC）和黑麦草+茶花壳+硝化抑制剂3,4 -二甲基吡唑磷酸（RSDM）处理土壤有效铅含量分别显著降低15.7%、17.5%和18.4%。同时，RS、RSDC和RSDM处理的土壤厚壁菌比均高于CK处理，说明提高土壤厚壁菌比可改善土壤健康。在双蒸馏水和柠檬酸浸出处理下，壳和硝化抑制剂的共同存在显著提高了黑麦草的株高和株重，显著促进了土壤生态系统的多功能性。虽然黑麦草在柠檬酸和EDTA-2Na +柠檬酸浸出组中不能存活，但添加壳改良剂和硝化抑制剂显著改善了土壤Shannon多样性指数和生物群落网络的稳定性。土壤pH、β-葡萄糖苷酶、脲酶、微生物群落多样性、厚壁菌门和放线菌门比例与土壤有效铅含量呈负相关。研究表明，柠檬酸淋滤+黑麦草+有机壳+ DCD组合是降低废弃矿区重金属风险和改善土壤生态系统健康的最佳策略。

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引用次数: 0

Urinary synthetic phenolic antioxidants exposure and plasma microRNA signatures: A profile and functional analysis in a Chinese population-based study 尿合成酚类抗氧化剂暴露和血浆microRNA特征：一项基于中国人群的研究的概况和功能分析

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2025-12-20 DOI: 10.1016/j.enceco.2025.12.015

Yuxin Xu , Zirui Zhang , Xulin Zhang , Jiajia Zhu , Rui Zeng , Wending Li , Xuedan Xu , Lulu Wang , Pinpin Long , Tao Jing , Tangchun Wu , Yu Yuan

Synthetic phenolic antioxidants (SPAs), recognized as contaminants of emerging concern, have been implicated in potential adverse health outcomes. Nevertheless, their epigenetic effects, particularly on plasma microRNAs (miRNAs) in humans, remain poorly characterized. This study aimed to investigate the associations between urinary concentrations of SPAs and plasma miRNA profiles, and further explore their potential biological functions. We quantified nine urinary SPAs in 142 Chinese adults by ultraperformance liquid chromatography-tandem mass spectrometry. Multivariate linear regression was employed to assess single-chemical relation, while multi-chemical associations were evaluated using two-way orthogonal partial least-squares analysis and weighted quantile sum regression. To explore the potential origin of SPA-related plasma miRNAs, we analyzed associations between miRNA levels in plasma and leukocytes. Leveraging leukocyte mRNA sequencing data and public databases, we performed pathway enrichment analysis to identify the pathways associated with SPA-associated miRNAs. We found that urinary 4-tert-Octylphenol and 2,6-di-tert-butyl-4-hydroxy-4-methyl-2,5-cyclohexadienone were significantly associated with 2 and 7 plasma miRNAs, respectively (False discovery rate < 0.10). Furthermore, mixed exposure to SPAs was associated with five miRNAs (miR-3135b, miR-769-5p, miR-548k, miR-3188, miR-7705) in both two models. Notably, miR-769-5p and miR-3135b demonstrated consistent associations across all analytical approaches. The positive associations between plasma levels of miR-769-5p, miR-548k, and miR-3188 and their corresponding intra-leukocyte levels (P < 0.05) suggested that leukocytes might serve as a potential source of these miRNAs. Functional analyses identified that SPA-related miRNAs were involved in pathways related to neurotoxicity and cancers, which may inform future environmental risk assessments and support the development of evidence-based strategies for reducing population exposure to SPAs.

合成酚类抗氧化剂（SPAs）被认为是日益受到关注的污染物，与潜在的不良健康后果有关。然而，它们的表观遗传效应，特别是对人类血浆microrna （miRNAs）的影响，仍然缺乏表征。本研究旨在探讨尿中spa浓度与血浆miRNA谱的关系，并进一步探讨其潜在的生物学功能。采用超高效液相色谱-串联质谱法对142例中国成年人尿液中9种spa进行了定量分析。采用多元线性回归评估单化学成分的相关性，采用双向正交偏最小二乘分析和加权分位数和回归评估多化学成分的相关性。为了探索spa相关血浆miRNA的潜在来源，我们分析了血浆和白细胞中miRNA水平之间的关系。利用白细胞mRNA测序数据和公共数据库，我们进行了途径富集分析，以确定与spa相关的mirna相关的途径。我们发现尿中的4-叔辛基酚和2,6-二叔丁基-4-羟基-4-甲基-2,5-环己二烯酮分别与2个和7个血浆mirna显著相关（错误发现率<； 0.10）。此外，在两种模型中，混合暴露于spa与五种mirna （miR-3135b, miR-769-5p, miR-548k, miR-3188, miR-7705）相关。值得注意的是，miR-769-5p和miR-3135b在所有分析方法中表现出一致的相关性。血浆中miR-769-5p、miR-548k和miR-3188的水平与其相应的白细胞内水平呈正相关（P < 0.05），这表明白细胞可能是这些mirna的潜在来源。功能分析发现，spa相关的mirna参与了与神经毒性和癌症相关的途径，这可能为未来的环境风险评估提供信息，并支持制定以证据为基础的策略，以减少spa的人群暴露。

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引用次数: 0

Cation-driven electrostatic modulation enhances Cr(VI) reduction by biochar 阳离子驱动的静电调制增强了生物炭对Cr（VI）的还原

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2025-12-20 DOI: 10.1016/j.enceco.2025.12.016

Wang Fu , Yundie Liang , Quan Chen , Min Wu , Danping Wu , Patryk Oleszczuk , Bo Pan

The coexistence of cations and anions critically influences contaminant behavior in various environments, yet their roles in redox-driven remediation remain underexplored. This study elucidates how cations (K(I), Mg(II), Zn(II), Cu(II), and Cr(III)) enhance biochar-mediated Cr(VI) removal through electrostatic modulation. By quantitatively decoupling the adsorption and reduction pathways, we demonstrated that cation co-presence promoted Cr(VI) adsorption (3.5–26.2-fold) and reduction (1.1–3.0-fold), with more than 63.9 % the overall Cr(VI) removal attributing to reduction. While superoxide radicals (·O₂⁻) contributed⁻ to liquid-phase reduction, their efficacy depended on interfacial accessibility rather than abundance. A significant correlation between zeta potential elevation and Cr(VI) reduction (P < 0.01) indicated electrostatic modulation as the key mechanism for the enhanced Cr(VI) removal in the presence of ions. Two-dimensional correlation spectroscopy (2DCOS) revealed that the preferential complexation of Cr(III) with carboxyl groups served as the primary electrostatic modulation pathway, retarding Cr(VI) adsorption. Subsequent reduction was driven by phenolic hydroxyl groups, which were oxidized to carboxylates during the conversion of Cr(VI) to Cr(III). This work emphasizes surface charge modification as a critical strategy for optimizing the redox functionality of biochar.

阳离子和阴离子的共存严重影响污染物在各种环境中的行为，但它们在氧化还原驱动的修复中的作用仍未得到充分探讨。本研究阐明了阳离子(K(I), Mg(II), Zn（II), Cu（II）和Cr(III)）如何通过静电调制增强生物炭介导的Cr（VI）去除。通过定量解耦吸附和还原途径，我们发现阳离子共存在促进了Cr（VI）的吸附（3.5 - 26.2倍）和还原（1.1 - 3.0倍），其中超过63.9%的Cr（VI）脱除归因于还原。虽然超氧自由基（·O₂-）有助于液相还原，但其效果取决于界面的可及性而不是丰度。zeta电位升高与Cr（VI）还原之间存在显著的相关性（P < 0.01），表明静电调制是离子存在下增强Cr（VI）去除的关键机制。二维相关光谱（2DCOS）显示，Cr（III）与羧基的优先络合是主要的静电调制途径，延缓了Cr（VI）的吸附。随后的还原是由酚羟基驱动的，在Cr（VI）到Cr（III）的转化过程中，酚羟基被氧化成羧酸盐。这项工作强调表面电荷修饰是优化生物炭氧化还原功能的关键策略。

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引用次数: 0

In-situ synthesis of biochar-based transition metal oxide composite catalysts for highly photothermal oxidation single- and multi-component indoor VOCs 原位合成生物炭基过渡金属氧化物复合催化剂用于高光热氧化室内单组分和多组分挥发性有机化合物

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2025-12-20 DOI: 10.1016/j.enceco.2025.12.011

Jun Wang , Wenjun Wang , Yucheng Hou , Qian Li , Bin Gong , Miaomiao Qu , Yun Shi , Jianmeng Chen , Li’an Hou

Although the photothermal synergistic catalysis technology shows great potential for eliminating indoor volatile organic compounds (VOCs), its catalytic degradation of multi-component VOCs with different polarities still faces challenges such as insufficient catalytic oxidation performance and weak selective adsorption. This study innovatively utilized waste silk textiles as the sustainable carbon source to successfully synthesize a biochar-based transition metal oxide composite catalyst via an in-situ growth method, constructing the MnO_x/C/TiO₂ ternary composite catalyst. The experimental result demonstrated that the optimal catalyst (TSTMn-0.05) had remarkable synergistic removal efficiency for the mixed pollutant of CH₂O and C₇H₈ under photothermal synergistic catalysis, and featured the degradation rates of 98.9 % and 85.2 % respectively within 90 min for CH₂O and C₇H₈ Its excellent performance stems from the broad-spectrum adsorption and enrichment of various polar VOCs by the biochar matrix, the unique heterojunction structure of the catalyst, and the synergistic effect of the multivalent redox cycling of Mn ions and the photothermal effect. During the photothermal synergy process, multiple effects jointly promote the efficient separation of photogenerated carriers and the generation of a large number of reactive oxygen species (ROS), thereby driving the deep mineralization of VOCs. This study not only achieves the high-value resource utilization of waste textiles but also provides a new strategy for developing advanced photothermal catalysts capable of efficiently purifying complex and multi-component VOCs.

虽然光热协同催化技术在消除室内挥发性有机物（VOCs）方面显示出巨大的潜力，但其对不同极性的多组分VOCs的催化降解仍面临催化氧化性能不足、选择性吸附弱等挑战。本研究创新性地以废丝织品为可持续碳源，通过原位生长法成功合成了生物炭基过渡金属氧化物复合催化剂，构建了MnOx/C/TiO2三元复合催化剂。实验结果表明，最优催化剂（TSTMn-0.05）在光热协同催化下对CH2O和C7H8的混合污染物具有显著的协同去除效率，在90 min内对CH2O和C7H8的降解率分别达到98.9%和85.2%。其优异的性能源于生物炭基质对多种极性VOCs的广谱吸附和富集，催化剂独特的异质结结构，锰离子多价氧化还原循环与光热效应的协同作用。在光热协同过程中，多种作用共同促进光生载体的高效分离和大量活性氧（ROS）的生成，从而驱动VOCs的深部矿化。该研究不仅实现了废纺织品的高价值资源化利用，而且为开发高效净化复杂多组分VOCs的先进光热催化剂提供了新思路。

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引用次数: 0

Effects of exposure route and surface coating on the bioaccumulation of CdTe quantum dots in fish. Considerations for testing nanomaterials following OECD Test guideline No. 305 暴露途径和表面涂层对鱼体内CdTe量子点生物积累的影响。考虑到测试纳米材料以下经合组织测试指南305

IF 8.2 Q1 ENVIRONMENTAL SCIENCES

Environmental Chemistry and Ecotoxicology

Pub Date : 2025-12-17 DOI: 10.1016/j.enceco.2025.12.012

Judit Kalman , Rocío Fernández-Saavedra , Carla Díaz-Tielas , Mona Connolly , Ana I. Cardona-García , Nathaniel Clark , Richard D. Handy , Eric A.J. Bleeker , Isabel Rucandio , José María Navas , María Luisa Fernández-Cruz

To identify nanomaterials of potential environmental concern and to support risk assessment for regulatory purposes bioaccumulation testing is required. However, further guidance is needed when applying the fish bioaccumulation OECD test guideline (TG) No. 305 to nanomaterials. Also questions remain surrounding the most appropriate exposure route and if subtle modifications to these materials (e.g. different coatings) will influence bioaccumulation potential. Therefore in this study OECD TG 305 was applied to assess the bioaccumulation potential of CdTe quantum dots (QDs) with additional considerations for testing nanomaterials. CdTe QDs were selected for our studies because of their increasing use, possible release to water and limited information on their bioaccumulation potential in fish. To specifically address the influence of exposure route and surface coating on bioaccumulation, the uptake and depuration kinetics of two differently coated (carboxylate and polyethylene glycol coatings) CdTe QDs were investigated in rainbow trout (Oncorhynchus mykiss) following either aqueous or dietary exposure. In the dietary exposure bioaccumulation assays, fish were exposed to CdTe QDs at concentrations of 10 or 100 mg/kg for 28 days, followed by a 28-day depuration period to derive biomagnification factors (BMFs). In the aqueous exposure bioaccumulation tests, fish were exposed to 4 or 40 μg CdTe QDs /L for 28 days, followed by a 14-day depuration period to derive bioconcentration factors (BCFs). Both materials showed a low bioaccumulation potential and while a higher uptake was seen for the PEG coated materials, overall biodistribution, uptake and depuration kinetics were similar. The dietary exposure route allowed good and consistent estimations of BMF following both sequential and simultaneous methods. Aqueous exposures showed CdTe QDs dissolution in aquarium water and a steady state was not reached within 28 days, which challenged derivation of BCF values.

This study provides important information on two differently coated CdTe QDs bioaccumulation, on OECD TG 305 applicability to metallic nanomaterials and on the reporting of accurate regulatory acceptable indicators of nanomaterial bioaccumulation potential.

为了识别潜在的环境问题纳米材料和支持监管目的的风险评估，需要进行生物积累试验。然而，在将鱼类生物积累OECD测试指南（TG） No. 305应用于纳米材料时，需要进一步的指导。此外，关于最合适的暴露途径以及对这些材料的细微修改（例如不同的涂层）是否会影响生物积累潜力的问题仍然存在。因此，在本研究中，OECD TG 305应用于评估CdTe量子点（QDs）的生物蓄积潜力，并考虑测试纳米材料。我们之所以选择CdTe量子点进行研究，是因为它们的使用日益增加，可能会释放到水中，而且关于它们在鱼类中的生物蓄积潜力的信息有限。为了明确暴露途径和表面涂层对生物积累的影响，研究了两种不同涂层（羧酸盐和聚乙二醇涂层）CdTe量子点在虹鳟鱼（Oncorhynchus mykiss）水中或饮食暴露后的吸收和净化动力学。在饮食暴露生物积累试验中，将鱼暴露于浓度为10或100 mg/kg的CdTe QDs中28天，然后进行28天的净化期，以获得生物放大因子（BMFs）。在水暴露生物积累试验中，鱼暴露于4或40 μg CdTe QDs /L 28天，然后是14天的净化期，以获得生物浓缩因子（BCFs）。两种材料都显示出较低的生物积累潜力，而PEG涂层材料的吸收率较高，总体生物分布、吸收和净化动力学相似。饮食暴露途径允许采用顺序和同时方法对BMF进行良好和一致的估计。水溶液暴露显示CdTe量子点在水族馆水中溶解，并且在28天内未达到稳定状态，这对BCF值的推导提出了挑战。本研究提供了关于两种不同涂层CdTe量子点的生物蓄积、OECD TG 305对金属纳米材料的适用性以及纳米材料生物蓄积潜力的准确调控可接受指标的报告的重要信息。

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引用次数: 0