Journal of Environmental Sciences-china最新文献_第4页

Wettability UV-switchable TiO2-based surface molecularly imprinted adsorbent for selective phenol removal and its function mechanisms 紫外光切换二氧化钛表面分子印迹吸附剂选择性去除苯酚及其作用机理

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-06-06 DOI: 10.1016/j.jes.2025.06.001

Boxi Jing , Lei Qin , Yong Zhong , Min Zhang , Yun Qu , Yongzhen Yang , Xuguang Liu

Aiming at the selective adsorption removal and efficient separation of pollutant phenol from wastewater, a photo-responsive surface molecularly imprinted adsorbent with smart ultraviolet (UV)-switchable wettability has been designed and synthesized. The selective adsorption of phenol is achieved by constructing phenol-imprinted cavities with o-phenylenediamine (o-PD) as the functional monomer, while the reversible switching of surface wettability is realized through the synergistic effect of the photo-induced hydrophilic hollow titanium dioxide (H-TiO₂) matrix and the cross-linked hydrophobic trimethylolpropane trimethacrylate imprinted polymer layer. The surface wettability of the constructed adsorbent o-PD/SMIP@H-TiO₂ can be changed from hydrophobic (water contact angle of 113°) to hydrophilic (water contact angle of 21°) after 30 min of UV irradiation, which is beneficial to the dispersion of the adsorbent and mass transfer of adsorbate. As the phenol adsorption takes place in the dark and reaches equilibrium (24.4 mg/g), the surface of o-PD/SMIP@H-TiO₂ gradually reverts to hydrophobicity, which facilitate the separation and regeneration of adsorbent, and the adsorption capacity in the 5th reuse maintains 94 %. Furthermore, 97 % of the adsorbed phenol can be recovered from the saturated o-PD/SMIP@H-TiO₂ adsorbent. Meanwhile, the adsorbent demonstrates distinct specific recognition and selective adsorption performance towards phenol when multiple phenolic pollutants are present in the solution. The selectivity is attributed to the formation of hydrogen bonds between the nitrogen atoms on the directionally-arranged o-PD monomers within the imprinted cavities and the hydrogen atoms of phenol molecules. This photo-responsive imprinted adsorbent material is expected to exert a substantial influence on the wastewater purification industry.

针对废水中污染物苯酚的选择性吸附去除和高效分离，设计并合成了一种具有智能紫外切换润湿性的光响应表面分子印迹吸附剂。苯酚的选择性吸附是通过以邻苯二胺（o-PD）为功能单体构建苯酚印迹空腔实现的，而表面润湿性的可逆切换是通过光诱导亲水性中空二氧化钛（H-TiO2）基质与交联疏水性三甲基丙烷三甲基丙烯酸酯印迹聚合物层的协同作用实现的。所构建的吸附剂o-PD/SMIP@H-TiO2在紫外线照射30 min后，其表面润湿性可由疏水性（水接触角为113°）变为亲水性（水接触角为21°），有利于吸附剂的分散和吸附质的传质。由于苯酚的吸附在黑暗中进行并达到平衡（24.4 mg/g）， o-PD/SMIP@H-TiO2表面逐渐恢复疏水性，有利于吸附剂的分离和再生，第5次重复使用时吸附容量保持94%。此外，饱和o-PD/SMIP@H-TiO2吸附剂可回收97%的吸附苯酚。同时，当溶液中存在多种酚类污染物时，吸附剂对苯酚具有明显的特异性识别和选择性吸附性能。这种选择性是由于在印迹腔内定向排列的o-PD单体上的氮原子与苯酚分子的氢原子之间形成了氢键。这种光反应印迹吸附材料有望对废水净化行业产生重大影响。

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引用次数: 0

Impacts of sea-land breeze on the coastal ozone in the Pearl River Delta, China 海陆风对珠江三角洲沿海臭氧的影响

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-08-23 DOI: 10.1016/j.jes.2025.08.037

Chenxi Liu , Haichao Wang , Lei Li , Xiaorui Chen , Xiao Lu , Shaojia Fan

Ground-level ozone (O₃) pollution has become increasingly prominent in coastal cities, where sea-land breeze (SLB) plays a crucial role. However, the impact mechanisms of SLB circulation on O₃ pollution in coastal region remain not well understand, since the SLB influence always coupled with the synoptic-scale wind fields. Here, by using 28-year observational data and the ERA5 reanalysis dataset, we reveal significant spatial heterogeneity in the impacts of SLB across the Pearl River Delta regions. On the western bank, O₃ concentrations are higher during SLB events compared to non-SLB periods under all synoptic weather patterns, since the SLB on the western bank predominantly occurs under low synoptic wind conditions, which also facilitates the O₃ formation. Therefore, O₃ pollution and the SLB event showed an adjoint relationship on the western bank, rather than the causation. On the eastern bank, O₃ concentration had varied responses on SLB events under different synoptic weather patterns: The sea breeze from the south combined with the synoptic wind in the same direction led to enhanced atmospheric diffusion capacity, thereby reducing the O₃ concentration; Once the synoptic wind is northeasterly, the counteraction between sea breezes and synoptic winds weakens dispersion conditions, resulting in O₃ accumulation. Quantitative analysis using random forest modeling demonstrates that SLB changes O₃ concentrations by -2.68 ppb (-8 %) under southerly weather patterns but increase by 11.51 ppb (20 %) under Northeasterly patterns on the eastern bank. We highlight the crucial regulatory role of mesoscale-synoptic scale coupling processes in regional O₃ distribution.

在沿海城市，地面臭氧（O3）污染日益突出，海陆风（SLB）在其中起着至关重要的作用。然而，由于SLB环流对沿海地区O3污染的影响总是伴随着天气尺度风场，因此对SLB环流对O3污染的影响机制还不是很清楚。利用28年的观测数据和ERA5再分析数据，揭示了SLB在珠三角地区的影响具有显著的空间异质性。在所有天气模式下，在低气压事件期间，西岸的O3浓度都高于非低气压事件期间，因为西岸的低气压主要发生在低天气风条件下，这也有利于O3的形成。因此，在西岸，O3污染与SLB事件表现为伴随关系，而非因果关系。东岸不同天气模式下O3浓度对SLB事件的响应不同：南向海风与同方向的天气风相结合，使大气扩散能力增强，从而使O3浓度降低；一旦天气风向为东北风，海风与天气风的相互作用减弱了弥散条件，导致O3积累。利用随机森林模型的定量分析表明，在偏南气候模式下，SLB使O3浓度变化了-2.68 ppb(- 8%)，而在东北气候模式下，东岸的O3浓度增加了11.51 ppb（20%）。我们强调了中尺度-天气尺度耦合过程在区域O3分布中的关键调节作用。

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引用次数: 0

Algal/bacterial membrane bioreactor for bioremediation of hazardous landfill leachate containing 1,4-dioxane: An artificial neural network modeling 藻/细菌膜生物反应器处理含1,4-二恶烷垃圾渗滤液：人工神经网络模型

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-08-06 DOI: 10.1016/j.jes.2025.08.004

Nawaf S. Alhajeri , Ahmed Tawfik , Mahmoud Nasr

This study developed an artificial neural network (ANN) model to predict the 1,4-dioxane removal efficiency from hazardous landfill leachate treated by an algal/bacterial symbiosis system. Three algal/bacterial membrane bioreactors were operated in parallel at a hydraulic retention time (HRT) range of 6–24 h, addressing the contribution of enzymatic activities and microbial communities in 1,4-dioxane detoxification. The achieved 1,4-dioxane removal efficiency of 82.8 % ± 3.2 % was supported by secreting extracellular polymeric substances (55.4 ± 2.9 mg/g), alcohol dehydrogenase (1.3 ± 0.03 U/mg), aldehyde dehydrogenase (0.9 ± 0.01 U/mg), and dehydrogenase (2.2 ± 0.04 U/mg) at 12 h-HRT. The genera Thioclava, Afipia, and Mycobacterium showed relative abundances of 7.4 %-7.9 %, 2.9 %-6.5 %, and 4.5 %-9.8 %, respectively, producing specific enzymes required for the aerobic metabolic and co-metabolic degradation of 1,4-dioxane into 2‑hydroxy‑1,4-dioxane and other intermediates. Additional batch experiments and kinetic studies were conducted to reveal the removal mechanisms of 1,4-dioxane in algal/bacterial biosystems and the uptake, biosorption, and assimilation of the generated metabolites in algal biosystems. An ANN model explained > 50 % of the 1,4-dioxane data variability and justified the effect of organic load variation on algal/bacterial activities. Future studies should improve the ANN prediction accuracy by including more inputs (e.g., pH, temperature, and membrane fouling) and optimizing the hidden layer number.

本研究建立了人工神经网络（ANN）模型，预测了藻类/细菌共生系统处理危险垃圾渗滤液中1,4-二恶烷的去除效率。在6 ~ 24 h的水力停留时间（HRT）范围内，三个藻类/细菌膜生物反应器并联运行，研究了酶活性和微生物群落对1,4-二恶烷解毒的贡献。在12 h-HRT条件下，细胞外聚合物质（55.4±2.9 mg/g）、乙醇脱氢酶（1.3±0.03 U/mg）、醛脱氢酶（0.9±0.01 U/mg）和脱氢酶（2.2±0.04 U/mg）的分泌支持了1,4-二氧六环的脱除效率，达到82.8%±3.2%。Thioclava属、Afipia属和Mycobacterium属的相对丰度分别为7.4% - 7.9%、2.9% - 6.5%和4.5% - 9.8%，它们产生了将1,4-二恶烷有氧代谢和共代谢降解为2 -羟基- 1,4-二恶烷和其他中间体所需的特定酶。为了揭示1,4-二氧六环在藻类/细菌生物系统中的去除机制，以及产生的代谢物在藻类生物系统中的吸收、生物吸收和同化，还进行了额外的批量实验和动力学研究。人工神经网络模型解释了50%的1,4-二恶烷数据变异性，并证明了有机负荷变化对藻类/细菌活动的影响。未来的研究应该通过引入更多的输入（如pH、温度和膜污染）和优化隐藏层数来提高人工神经网络的预测精度。

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引用次数: 0

Unravelling the catalyst degradation-derived ammonia and nitrous oxide secondary pollutants emissions from light-duty gasoline vehicles 揭示轻型汽油车催化剂降解衍生的氨和氧化亚氮二次污染物排放

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-07-02 DOI: 10.1016/j.jes.2025.07.002

Tingting Zheng , Dongxia Yang , Haohua Zhang , Wenzheng Xia , Bing Lu , Chengxiong Wang , Yunkun Zhao , Xiaoyu Chong

Ammonia and nitrous oxide emissions impacts are beginning to get more attention, due to their potential to adversely effect on air pollution, climate and human health. Vehicle emission and laboratory simulation testing were employed to analyze the ammonia (NH₃) and nitrous oxide (N₂O) emission characteristics from a light-duty gasoline vehicle equipped with a monolithic three-way catalyst. It was found that NH₃ emission factors were much higher than N₂O emission factors, reaching 27.8 mg/km for an engine-aged catalyst. Catalyst aging and degradation resulted in the loss of three-way catalytic activity and reducibility, which led to a significant increase in the emissions of NH₃ and N₂O by-products. An engine aged catalyst showed higher N₂O and NH₃ emission than thermally aged catalyst for the real vehicle tests. Raman and electron probe results indicated that the agglomeration of active metals affects the dissociation process of NO on the metal surface, thereby affected the selectivity of the catalyst for N₂O and NH₃.

由于氨和一氧化二氮排放可能对空气污染、气候和人类健康产生不利影响，它们的影响开始受到更多关注。采用整车排放与室内模拟测试相结合的方法，分析了搭载整体式三元催化剂的轻型汽油车氨（NH3）和氧化亚氮（N2O）的排放特征。NH3排放因子远高于N2O排放因子，发动机老化催化剂的NH3排放因子达到27.8 mg/km。催化剂老化和降解导致三元催化活性和还原性丧失，NH3和N2O副产物排放量显著增加。在实车试验中，发动机老化催化剂的N2O和NH3排放量高于热老化催化剂。拉曼和电子探针结果表明，活性金属的团聚影响了NO在金属表面的解离过程，从而影响了催化剂对N2O和NH3的选择性。

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引用次数: 0

Severe ozone pollution drives physiological stress in winter wheat: Evidence from satellite-based chlorophyll fluorescence analysis 严重的臭氧污染驱动冬小麦的生理应激：来自卫星叶绿素荧光分析的证据

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-09-01 DOI: 10.1016/j.jes.2025.08.059

Rongjun Wu , Jiacheng Zhao , Evgenios Agathokleous , Bo Shang , Zhaozhong Feng

Understanding the impact of ozone (O₃) pollution on photosynthesis is essential for estimating crop yields and ensuring food security. While remote sensing of Sun-induced chlorophyll fluorescence (SIF) effectively assesses plant stress, most studies have focused on temperature and water deficits, with limited attention to O₃-induced chlorophyll degradation. To address this gap, we utilized the SIF data from the TROPOspheric Monitoring Instrument (TROPOMI) to investigate the response of winter wheat to severe O₃ stress in China’s primary wheat-producing region during 2019–2023, a period marked by substantial O₃ pollution. Our analysis revealed that variations in satellite-derived SIF were largely driven by crop structural traits; however, the physiological signal captured by SIF yield (Φ_F) also accounted for 23 % of the observed SIF variability. Notably, using the partial correlation analysis, Φ_F exhibited a stronger sensitivity to O₃ exposure (r = -0.36, as indicated by the maximum daily 8-hour average O₃ concentration [MDA8]) compared to other traditionally influential factors such as maximum daily air temperature (T_max, r = -0.12) and vapor pressure deficit (VPD, r = -0.06). Furthermore, model simulations demonstrated that Φ_F begins to decline sharply when the MDA8 threshold exceeds 132 μg/m³. These findings deepen our understanding of satellite-based SIF observations and underscore the critical importance of monitoring O₃ pollution, an often-overlooked factor, in the context of crop growth and productivity under changing climatic conditions.

了解臭氧（O3）污染对光合作用的影响对于估算作物产量和确保粮食安全至关重要。虽然太阳诱导的叶绿素荧光（SIF）遥感可以有效地评估植物胁迫，但大多数研究都集中在温度和水分亏缺上，对臭氧诱导的叶绿素降解的关注有限。为了弥补这一空白，我们利用对流层监测仪器（TROPOMI）的SIF数据，研究了2019-2023年中国小麦主产区冬小麦对严重O3污染的响应。我们的分析显示，卫星衍生的SIF的变化在很大程度上是由作物结构性状驱动的；然而，SIF产量捕获的生理信号（ΦF）也占观察到的SIF变异的23%。值得注意的是，通过偏相关分析，ΦF对O3暴露的敏感性（r = -0.36，由最大日8小时平均O3浓度[MDA8]表示）高于其他传统影响因素，如最高日气温（Tmax, r = -0.12）和蒸汽压差（VPD, r = -0.06）。模型模拟表明，当MDA8阈值超过132 μg/m3时，ΦF开始急剧下降。这些发现加深了我们对基于卫星的SIF观测的理解，并强调了监测O3污染的重要性，这是一个经常被忽视的因素，在气候条件变化的背景下影响作物生长和生产力。

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引用次数: 0

Direct iron-electron driven autotrophic denitrification for low-carbon nitrate wastewater treatment 直接铁电子驱动自养反硝化处理低碳硝酸盐废水

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-05-29 DOI: 10.1016/j.jes.2025.05.067

Sicong Ma , Cancan Ling , Hao Zhang , Di Yang , Shiyu Cao , Minzi Liao , Wendong Wei , Hao Li , Yancai Yao , Hongwei Sun , Lizhi Zhang

Wastewater treatment is an important source of greenhouse gas emissions, with traditional biological denitrification relying on organic carbon sources contributing to over 15 % of its carbon footprint. Herein we develop a direct iron-electron driven autotrophic denitrification strategy with zero-valent iron (ZVI), Shewanella oneidensis MR-1 and Paracoccus denitrificans for low-carbon nitrate wastewater treatment. Without adding any organic carbon sources, this strategy reduced total nitrogen from 28.2 to 2.4 mg/L within 6 days through direct electron transfer between iron and microbes, different from traditional H₂-mediated mechanisms. The direct iron-microbe electron transfer depends on the outer membrane-bound cytochromes, where hemes coordinate with ZVI’s oxidized shell via carboxyl groups, facilitating electron transfer from iron to S. oneidensis MR-1, which then converts bicarbonate into formate to drive autotrophic metabolism for simultaneous denitrification and CO₂ capture. Life cycle analysis reveals the carbon emission of direct iron-electron driven autotrophic denitrification is approximately 2.51 kg CO₂/kg N, significantly lower than that of sodium acetate electron-driven denitrification counterpart (approximately 4.07 kg CO₂/kg N). This study introduces a low-carbon strategy for autotrophic nitrate removal from wastewater, and highlights the importance of desirable electron transfer pathway in sustainable wastewater treatment.

废水处理是温室气体排放的重要来源，传统的生物反硝化依赖有机碳源，其碳足迹占其碳足迹的15%以上。在此，我们开发了一种直接铁电子驱动的自养反硝化策略，该策略采用零价铁（ZVI）、希瓦氏菌MR-1和副球菌反硝化，用于低碳硝酸盐废水的处理。该策略在不添加任何有机碳源的情况下，通过铁与微生物之间的直接电子转移，在6天内将总氮从28.2 mg/L降低到2.4 mg/L，不同于传统的h2介导机制。铁微生物的直接电子转移依赖于外膜结合的细胞色素，其中血红素通过羧基与ZVI的氧化壳配合，促进电子从铁转移到S. oneidensis MR-1，然后将碳酸氢盐转化为甲酸盐，驱动自营养代谢，同时进行反硝化和二氧化碳捕获。生命周期分析表明，铁电子直接驱动自养反硝化的碳排放量约为2.51 kg CO2/kg N，显著低于乙酸钠电子驱动反硝化的碳排放量（约为4.07 kg CO2/kg N）。本研究介绍了一种低碳自养去除废水中硝酸盐的策略，并强调了理想的电子转移途径在可持续废水处理中的重要性。

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引用次数: 0

Structural transformation of hexagonal birnessite as an indicator of environmental impact: The role of thallium interaction pathways, pH, and illumination 六方菱铁矿的结构转变作为环境影响的一个指标：铊相互作用途径、pH和光照的作用

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-06-20 DOI: 10.1016/j.jes.2025.06.038

Tianqiang Zhu , Wen Zhuang , Feng Li , Liwen Zheng , Jihua Liu

Thallium (Tl) is a highly toxic trace metal, is present in various environments, such as soils, waters, and sediments. Hexagonal birnessites (HB), naturally occurring minerals, significantly influence metal geochemical cycling due to their strong ability to adsorb and oxidize toxic metals. Understanding the transformation mechanisms of HB into tunnel structures is crucial for predicting their impact on Tl’s environmental fate. This study investigated the reactions between Tl(I) and acidic birnessite (AcBi), a common form of HB, under different conditions. Tl(I) was added to AcBi systems either as a single dose or in twelve equal increments across a pH range of 2 to 6, under both light and dark conditions. Continuous Tl(I) additions at pH 4 transformed over 90 % of AcBi into a 2 × 2 tunnel structure, while at pH 6, 53 %-75 % transformed. At pH 2, intense proton competition inhibited structural reconfiguration. Single dose addition caused minor structural changes at pH 4 and none transformation at pH 2 or 6. Illumination accelerated transformations, likely through photoinduced electron transfers. The oxidation state and adsorption coordination of Tl varied with mineral structure: Tl(III) was predominantly found in layered structures, while dehydrated Tl(I) dominated in tunnel structures, which retained Tl less effectively. These findings offer new insights into the environmental behaviors of these substances and informs strategies to manage thallium pollution.

铊（Tl）是一种剧毒的微量金属，存在于各种环境中，如土壤、水和沉积物。六方碧玉矿（HB）是天然存在的矿物，具有较强的吸附和氧化有毒金属的能力，对金属地球化学循环具有重要影响。了解HB转化为隧道结构的机制对于预测其对Tl环境命运的影响至关重要。本研究考察了HB的一种常见形式——酸性铋矿（AcBi）与Tl(I)在不同条件下的反应。在光照和黑暗条件下，将Tl(I)以单剂量或12次等量添加到AcBi系统中，pH范围为2至6。在pH值为4时，连续添加Tl(I)将90%以上的AcBi转化为2 × 2隧道结构，而在pH值为6时，转化为53% - 75%。在pH为2时，强烈的质子竞争抑制了结构重构。在pH值为4时，单剂量添加引起了轻微的结构变化，在pH值为2或6时没有发生转变。光照加速了转换，可能是通过光诱导的电子转移。Tl的氧化态和吸附配位随矿物结构的变化而变化：Tl（III）主要存在于层状结构中，而脱水的Tl(I)主要存在于隧道结构中，隧道结构对Tl的保留效果较差。这些发现为这些物质的环境行为提供了新的见解，并为管理铊污染的策略提供了信息。

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引用次数: 0

Nitrogen removal dynamics in a eutrophic-tributary of China's Three Gorges Reservoir during water impoundment period: Insights from denitrification rates and dissolved N2 measurements 三峡水库蓄水期富营养化支流的氮去除动态：来自反硝化速率和溶解氮测量的见解

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-11-15 DOI: 10.1016/j.jes.2025.11.034

Yanan Huang , Yanxing Han , Xiaojuan Guo , Zhengjian Yang , Daobin Ji , Shangbin Xiao , Defu Liu

Reservoirs function as critical nitrogen sinks within watersheds, yet their removal efficiencies remain poorly characterized. In this study, we quantified denitrification rates and excess dissolved nitrogen gas (N₂) in Xiangxi Bay, a eutrophic tributary of the Three Gorges Reservoir (TGR) to evaluate its capacity for nitrogen removal. The results indicated that water denitrification rates ranged from 5.16 to 65.31 nmol/(L·h), whereas those in sediments ranged from 2.56 to 7.75 nmol/(g·h). Both exhibited an increasing trend from downstream to upstream during the water impoundment period of the TGR. The in-situ variation of excess dissolved N₂ (ΔN₂) concentration (1.05–98.97 μmol/L) reflected the spatiotemporal distribution characteristics of denitrification rates and nitrogen removal capacity, indicating substantial nitrogen removal in Xiangxi Bay. Additionally, key factors affecting denitrification in water included dissolved organic carbon (DOC), chlorophyll a, and turbidity, whereas key factors in sediments were total organic carbon, total nitrogen, and DOC in pore water. Overall, the increase in organic matter in water and sediments triggered by algal growth/death and settling promoted denitrification, but excessive algal proliferation could lead to nitrogen limitation, thereby inhibiting denitrification. Therefore, preventing and managing algal blooms in tributaries could provide new insights for removing nitrogen in watersheds and safeguarding the health of aquatic ecosystems.

储层在流域内起着关键的氮汇作用，但它们的去除效率仍然很差。本研究对三峡水库富营养化支流湘溪湾的反硝化速率和过量溶解氮（N₂）进行了量化，以评价其脱氮能力。结果表明，水体反硝化速率为5.16 ~ 65.31 nmol/(L·h)，沉积物反硝化速率为2.56 ~ 7.75 nmol/（g·h）。在三峡水库蓄水期间，两者均呈现由下游向上游增加的趋势。过量溶解态N2 （ΔN2）浓度（1.05 ~ 98.97 μmol/L）的原位变化反映了湘西湾水体反硝化速率和脱氮能力的时空分布特征，表明湘西湾水体脱氮效果显著。水体中影响反硝化作用的关键因素包括溶解有机碳（DOC）、叶绿素a和浊度，沉积物中影响反硝化作用的关键因素是孔隙水中的总有机碳、总氮和DOC。总体而言，藻类生长/死亡和沉降引发的水体和沉积物中有机质的增加促进了反硝化作用，但藻类过度增殖可能导致氮限制，从而抑制反硝化作用。因此，预防和管理支流藻华可以为去除流域氮和维护水生生态系统的健康提供新的见解。

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引用次数: 0

Long-term stabilization of chromium, copper, and zinc co-contaminated soil using phosphorylated zero-valent iron 磷酸化零价铁对铬、铜和锌共污染土壤的长期稳定作用

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-07-29 DOI: 10.1016/j.jes.2025.07.056

Lu Liu , Shiwei Huang , Kaiting Cao , Qiming Wang , Hao Xu , Weichun Yang

Heavy metal contamination of soil, particularly the co-contamination of chromium, copper, and zinc, has emerged as a significant threat to ecological systems and human health. This study developed a phosphorylated zero-valent iron (ZVI/PR) material through a ball milling process that combines natural phosphate rock with iron powder, aiming to detoxify and stabilize heavy metals in soil simultaneously. Experimental results demonstrated that ZVI/PR exhibited superior removal efficiencies for Cr(VI), Cu(II), and Zn(II)-6.49, 4.85, and 21.32 times higher, respectively, than those of ball-milled phosphate rock (BMP), and 5.99, 6.98, and 21.00 times higher than those of ball-milled zero-valent iron (BMZ). ZVI/PR demonstrated increased reactivity and effective pH self-regulation capabilities. The ZVI/PR promoted the sustained release of Fe(II), facilitating the simultaneous stabilization of Cr, Cu, and Zn. ZVI/PR significantly reduced heavy metal concentrations in the soil, with Cr(VI) removal efficiency reaching 99.04 %, and the stabilization efficiencies of DTPA-extractable Cu and Zn exceeded 60 % in the co-contaminated soil. Soil treated with ZVI/PR showed a significant increase in stable fractions (residual and organic matter-bound fractions) of Cr (16 % to 41 % in seven days), Cu (16.8 % to 59.6 % in one day), and Zn (11.56 % to 23.46 % over 28 days) compared to untreated soil. Notably, after 180 days of the toxicity characteristic leaching procedure test, ZVI/PR demonstrated long-term stability in soil remediation. This study offers a cost-effective method for remediating soils co-contaminated with multiple heavy metals.

土壤重金属污染，特别是铬、铜和锌的共污染，已成为生态系统和人类健康的重大威胁。本研究将天然磷矿与铁粉结合，通过球磨工艺开发出一种磷酸化零价铁（ZVI/PR）材料，旨在同时解毒和稳定土壤中的重金属。实验结果表明，ZVI/PR对Cr（VI）、Cu（II）和Zn（II）的去除率分别比球磨磷矿（BMP）高6.49、4.85和21.32倍，比球磨零价铁（BMZ）高5.99、6.98和21.00倍。ZVI/PR表现出更高的反应性和有效的pH自我调节能力。ZVI/PR促进了Fe（II）的缓释，促进了Cr、Cu和Zn的同时稳定。ZVI/PR显著降低了土壤中重金属浓度，对Cr（VI）的去除率达到99.04%，对dtpa可萃取的Cu和Zn的稳定效率超过60%。与未处理土壤相比，ZVI/PR处理土壤中Cr （7 d内16% ~ 41%）、Cu （1 d内16.8% ~ 59.6%）和Zn （28 d内11.56% ~ 23.46%）的稳定组分（残余组分和有机质结合组分）显著增加。值得注意的是，经过180天的毒性特征浸出过程试验，ZVI/PR在土壤修复中表现出长期稳定性。本研究为多种重金属共污染土壤的修复提供了一种经济有效的方法。

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引用次数: 0

Occurrence and characteristics of organochlorine pesticides from soils due to permafrost thaw slumping on the Qinghai-Tibetan Plateau 青藏高原冻土融化滑坡土壤中有机氯农药的赋存特征

IF 6.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china

Pub Date : 2026-05-01 Epub Date: 2025-08-05 DOI: 10.1016/j.jes.2025.07.062

Xiaoyue Zhang , Lili Yang , Shiwei Sun , Shichang Kang , Junming Guo , Chenyan Zhao , Qingyu Guo , Minghui Zheng , Guorui Liu

The degradation of permafrost on the Qinghai–Tibetan Plateau (QTP) due to climate warming poses a significant risk for re-emitting previously trapped persistent organic pollutants (POPs) into the environment. This study focuses on the distribution of organochlorine pesticides (OCPs) in the active layer soils in permafrost thaw slumping areas. Soil samples were collected from different thaw slumping stages, including the control, margin, drape, raft, and exposed zones (abbreviated as CT, MG, DP, RF, and EP). We analyzed the concentrations of 22 OCPs, including dichlorodiphenyltrichloroethane (DDTs), hexachlorocyclohexanes (HCHs), chlordane compounds (CHLs), endosulfan compounds (EDFs), aldrin, dieldrin, endrin, and mirex, across various depths of slumping stages. The results indicated that thaw slumps affected the vertical migration and accumulation of these pollutants significantly. High concentrations of p,p'-DDT, and p,p'-DDE were observed, particularly in the DP and RF zones, highlighting the advanced thaw stages (DP/RF) has potential as a secondary source of OCPs emissions into the atmosphere. Furthermore, air-soil exchange models revealed a volatilization trend for certain OCPs, further emphasizing the risk of increased atmospheric contamination. These findings provide critical insights into the role of permafrost thaw slumps as both sinks and sources of POPs in a warming climate.

气候变暖导致青藏高原永久冻土带的退化，对以前被捕获的持久性有机污染物（POPs）重新排放到环境中构成了重大风险。研究了多年冻土融化滑坡区活性层土壤中有机氯农药的分布规律。在不同的解冻滑坡阶段收集土壤样本，包括控制区、边缘区、覆盖区、筏区和暴露区（缩写为CT、MG、DP、RF和EP）。我们分析了22种OCPs的浓度，包括二氯二苯三氯乙烷（DDTs）、六氯环己烷（HCHs）、氯丹化合物（CHLs）、硫丹化合物（EDFs）、艾氏剂、狄氏剂、endrin和灭螨剂，它们分布在不同的滑坡阶段深度。结果表明，融塌对这些污染物的垂直迁移和积累有显著影响。观测到高浓度的p，p'-滴滴涕和p，p'-DDE，特别是在DP和RF区，突出表明解冻后期（DP/RF）有可能成为OCPs排放到大气中的次要来源。此外，空气-土壤交换模式揭示了某些OCPs的挥发趋势，进一步强调了大气污染增加的风险。这些发现对永久冻土融化滑坡在变暖气候中作为持久性有机污染物的汇和源的作用提供了重要的见解。

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引用次数: 0