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Effects of elevated atmospheric carbon dioxide to Microcystis aeruginosa under different forms of phosphorus sources

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Chemosphere 2025年 374卷 144210页

作者： Zhang, Juanjuan Xu, Wenxuan Zhang, Qingquan Deng, Lin Ai, Fuxun Yin, Ying Guo, Hongyan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Joint International Research Centre for Critical Zone Science-University of Leeds and Nanjing University Nanjing University Nanjing210023 China Jiangsu Academy of Environmental Industry and Technology Corp. Nanjing210000 China

Human activities have led to an increase in atmospheric carbon dioxide (CO2) concentration, which can enhance the flux of CO2 from air to water, thus impacting algal growth. Phosphorus (P) is a key factor influencing the formation of cyanobacteria blooms. Nutrient utilization is closely related to carbon (C) metabolism, but the effects of elevated CO2 on microalgae under different P sources are rarely studied. In this study, we investigated the growth and physiological and biochemical responses of Microcystis aeruginosa (M. aeruginosa) under ambient (400 ppm) and elevated (550 ppm) CO2 levels in P-free, dissolved inorganic P (DIP, 1 mg P/L), and dissolved organic P (DOP, 1 mg P/L) groups. The bioavailability of DIP to M. aeruginosa was greater than that of DOP, and elevated CO2 increased both the uptake of DIP and DOP. Elevated CO2 promoted the growth (increasing by 9.0%–14.2%), photosynthesis, and CO2 fixation of M. aeruginosa under different P sources (P-free, DIP, DOP), and increased total microcystin-LR content (increasing by 5.4%–12.6%), which increased the risk of microcystin-LR release into the environment. Furthermore, elevated CO2 aggravated the stress effect of DOP, leading to an increase in protein content and proportion of humic acid substances in the extracellular polymeric substances. Our study provides a theoretical basis for understanding the impact of elevated CO2 on cyanobacteria bloom under different P sources, and provides a new insight for the control of eutrophic waters under the background of climate change. © 2025 Elsevier Ltd

关键词： Carbon stable isotope Elevated carbon dioxide Microcystin-LR Microcystis aeruginosa Phosphorus

Fabrication of novel thin-film composite membrane based on ultrathin metal-organic framework interlayer for enhancing forward osmosis performance

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Chinese Chemical Letters 2023年第12期34卷 305-309页

作者： Hao Liu Bo Li Pin Zhao Rongming Xu Chuyang Y.Tang Weilong Song Zunaira Habib Xinhua Wang Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Shenergy Environmental Technology Co. Ltd.Hangzhou 31100China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Department of Civil Engineering The University of Hong KongHong Kong SAR 999077China Institute of Environmental Sciences and Engineering School of Civil and Environmental EngineeringNational University of Sciences and TechnologyIslamabad44000Pakistan Department of Chemistry Rawalpindi Women UniversityRawalpindi 46300Pakistan Jjiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

To improve operation efficiency,an interlayered thin-film composite forward osmosis(iTFC-FO)membrane was designed by introducing an ultrathin and porous interlayer based on aluminum tetra-(4-carboxyphenyl)porphyrin(a stable metal-organic framework nanosheet,Al-MOF).Surface characterization results revealed that Al-MoF spread evenly in the macro-porous substrate,and provided a flat and smooth reaction interface with moderate hydrophilicity and uniform small *** resultant polyamide(PA)layer had a thin base(without intrusion into substrate)and crumpled surface(with abundant leaves).The leaves size and cross-linking degree of PA layer firstly increased and then decreased with the Al-MOF *** to the original membrane,the iTFC-FO showed an enhanced water permeability and a reduced reverse sodium flux in both modes of active layer facing feed solution(ALFS)and active layer facing draw solution(AL-DS).To be specific,the specific reverse sodium flux(reverse sodium flux/pure water flux)decreased from 0.27 g/L to 0.04 g/L in the AL-FS mode,while from 1.36 g/L to 0.23 g/L in the AL-DS mode with 2 mol/L NaCl as ***,the iTFC-FO maintained high stability and high permeability under high-salinity and contaminated *** study offers a new possibility for the rational fabrication of high-performance TFC-FO membranes.

关键词： Thin-film composite embrane Forward osmosis 2Dmetal-organic ramework Porous interlayer Membrane prformance

Electrodeposited copper enhanced removal of 2,4-dichlorophenol in batch and flow reaction in Cu@CC-PS-MFC system

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Chemosphere 2023年第1期340卷 139801页

作者： Zhu, Minjie Wang, Hongyuan Li, Chunji Liu, Qinglong Wang, Lan Tang, Jingchun National Engineering Laboratory for Site Remediation Technologies/MOE Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and Engineering Nankai University Tianjin300350 China State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China/Key Laboratory of Non-point Source Pollution Control Ministry of Agriculture and Rural Affairs Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing100081 China

Combination of microbial fuel cell (MFC) and advanced oxidation process (AOP) is promising for pollutant removal. In this paper, Cu0-loaded carbon cloth cathode by electrodeposition (Cu@CC-PS-MFC) was applied to enhance 2,4-dichlorophenol (2,4-DCP) degradation based on persulfate (PS) activation in microbial fuel cell. Cu0 exhibited a typical structure of face-centered cubic metal polyhedron on carbon cloth. The removal of 2,4-DCP by Cu@CC-PS-MFC (75.6%) was enhanced by more than 50% compared to CC-PS-MFC (49.2%) after 1 h of reaction. 30 mg/L 2,4-DCP in Cu@CC-PS-MFC was completely removed and achieved a high mineralization (80.6%) after 9 h of reaction under optimized condition with low dissolved copper ion concentration (0.615 mg/L). Meanwhile, more than 90% removal of 2,4-DCP was stably achieved with flow operation condition (hydraulic residence time of 7.2 h). The change of copper valent state Cu0/Cu2O/CuO was the main mechanism of PS activation with main reactive species of O•H and O21. The bioanode of MFC enhanced the in-situ regeneration of ≡Cu+ and ≡Cu0 on the catalyst surface by transporting electrons, which was believed to contribute to good catalyst lifetime and excellent 2,4-DCP removal. Electrodeposited copper contributes to the enhanced degradation of 2,4-DCP with energy recovery at the same time which can further broaden the application MFC. © 2023 Elsevier Ltd

关键词： Metal ions

Preparing Pd/Sn Modified Nickel Foam Electrode for Nitrate Removal from Aqueous Solutions

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SSRN 2022年

作者： Shen, Zhanhui Fang, Menghao Gao, Ya Shi, Jialu Peng, Jianbiao Jiang, Kai Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control Ministry of Education Henan Key Laboratory for Environmental Pollution Control School of Environment Henan Normal University 46 East of Construction Road Xinxiang453007 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University 163 Xianlin Road Nanjing210023 China

Nitrate pollution in ground water and surface water has been becoming a worldwide problem that poses a great challenge to steady water ecosystem and human health. Electrochemical reduction of nitrate is a promising way to remove nitrate from water because of advantages. We prepared Pd/Sn modified nickel foam (NF) electrode according to a two-step electrodeposition method. The prepared NF-Pd/Sn electrode showed a micromorphology like "Karst Fengcong" with peaks, saddles and nadirs intertwined with each other. Pd 0 and Sn 0 were detected on the NF-Pd/Sn electrode and the mass ratio of Pd/Sn was 4.3/1. The NF-Pd/Sn electrode showed the highest nitrate reaction rate ( k obs : 0.543 h -1 ) and removal efficiency (94%) at the condition of 100 mg N/L, 0.05 mol/L Na 2 SO 4 and -1.6 V vs. Ag/AgCl sat. KCl. The highest N 2 -selectivity (100%) was reached at the condition of 100 mg N/L, 0.05 mol/L NaCl and -1.6 V vs. Ag/AgCl sat. KCl. The microstructure of NF-Pd/Sn electrode like "Karst Fengcong" could provide large specific surface area and lots of active sites for nitrate adsorption and electrocatalytic reduction in aqueous solution. The adsorption and the reduction reaction of NO 3 - on the surface of NF-Pd/Sn could increase the electric current response in the test system. © 2022, The Authors. All rights reserved.

关键词： Electrodes

Microplastics in Surface Seawater of Kongsfjorden, Svalbard, Arctic

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SSRN 2024年

作者： Li, Yubo Lu, Zhibo Zhang, Xin Wang, Juan Zhao, Shuiqian Shen, Jian Dong, Lei Gao, Yun-Ze Yang, Yifeng Cui, He Yang, Yinchuan Co. Ltd. Shanghai200092 China College of Environmental Science and Engineering Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse Shanghai200092 China Narwhal Ocean Research Center Shanghai200434 China

Microplastics have now become an emerging contaminant with high concern in the Arctic and Sub-Arctic Region. Here, Kongsfjorden system in Arctic has been investigated for abundance, distribution, and characteristic of microplastics in surface seawater. Eighteen samples were collected using an in-situ filtration sampling method, and then analyzed by Fourier-transform infrared spectroscopy. The average abundance of microplastics in surface seawater was 3.6 items m-3, with an abundance range of 0.0—10.0 items m-3. The highest abundance of microplastics was located adjacent to the eddy in Kongsfjorden, where a microplastic accumulation zone might have formed. Microplastics transported by ocean currents and those from local discharges might converge in this zone. Two sampling stations were set up at the wastewater treatment plant outfall, which showed an abundance range of 4.0—6.0 items m-3, slightly higher than the average abundance. Of the six polymer types identified, rayon, polyester and polyamide were the most common composition. Proportions in fiber form in surface water was 84.6%, and blue (28.2%) and transparent (25.6%) were predominant colors. Most microplastics (>90.0%) were less than 1 mm in the longest dimension. This study provided important baseline data as well as a practical microplastic sampling method for polar marine environments. © 2024, The Authors. All rights reserved.

关键词： Microplastic

Niche Differentiation of Comammox Nitrospira and Canonical Nitrifiers in Riparian Wetland Ecosystems Around Taihu Lake

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SSRN 2022年

作者： He, Yanqing She, Yuecheng Qi, Xin Zhang, Hui Wang, Wei Li, Zhengkui School of the Environment Nanjing University Nanjing Jiangsu210023 China State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210023 China

Complete ammonia oxidation (Comammox) overturned our perception of ammonia oxidation and challenged the traditional two-step nitrification theory. Newly discovered comammox Nitrospira and canonical nitrifiers (AOA and AOB) collaboratively perform the oxidation of ammonia in ecosystems. However, the niche distribution of comammox Nitrospira is controversial. In our study, we explored the distribution, diversity and driving environmental factors of comammox Nitrospira in riparian wetland ecosystems around Taihu Lake. Comammox Nitrospira was detected in all 15 soil samples, with the amo A gene abundance ranging from 1.83×10 5 to 8.35×10 7 copies/g. In most soil samples, the amo A gene abundance of comammox Nitrospira was lower than that of canonical nitrifiers. High-throughput sequencing indicated that the community structure of comammox Nitrospira had both spatial and temporal heterogeneity. The comammox Nitrospira detected in our study was divided into cladeA.1 cluster and clade A.2 cluster. Comammox Nitrospira clade A.2 observed in all soil samples was more prevalent, while the clade A.1 was mainly observed in the wheat field. Nitrospira sp. and Nitrospira sp. LK70 had the highest relative abundance and might be the key species of comammox Nitrospira . Temperature, soil moisture content, NH 4 + , total nitrogen, total carbon and pH were the main environmental factors causing the niche differentiation between comammox Nitrospira and canonical nitrifiers. Collectively, our study expands the general insights into the niche distribution of comammox Nitrospira and the driving environmental factors in riparian wetland ecosystems around Taihu Lake. © 2022, The Authors. All rights reserved.

关键词： Nitrification

Flow paths control on spatiotemporal weathering dynamics in high-relief regions, eastern Qinghai-Tibet Plateau: Insight from dissolved Li-Sr-O isotopes

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Chemical Geology 2025年 689卷

作者： Ma, Tingting Zhong, Jun Li, Si-Liang Xu, Sen Luo, Han Liu, Cong-Qiang MOE Key Laboratory of Groundwater Quality and Health School of Environmental Studies China University of Geosciences Wuhan430078 China Institute of Surface-Earth System Sciences School of Earth System Science Tianjin University Tianjin300072 China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution School of Environmental Studies China University of Geosciences Wuhan430078 China

Mountain-building is generally acknowledged to accelerate chemical weathering of silicate rocks by reshaping geomorphology, tectonics, hydrology, and climate. Yet, the dominant driving forces of terrestrial silicate weathering remain unclear. To reveal the mechanisms of silicate weathering during mountain-building, we present hydrochemistry, water isotopes (δD and δ18O), radiogenic strontium isotopes (87Sr/86Sr), and lithium isotope (δ7Li) data of river waters from the tectonically active, fault-rich Bailong River catchment on the northeastern Qinghai-Tibet Plateau. Results show a wide spatial range of dissolved δ7Li values from +8.4 to +20.8 ‰ and a relatively narrow temporal range from +14.0 to +16.8 ‰. Spatially, δ7Li values negatively correlate with Li/Na ratios, suggesting significant Li uptake into secondary minerals. Downstream increases in δ7Li values corresponding with decreasing Si/(Nasil + K) and K/(Nasil + K) ratios (Nasil refers to the Na concentration derived from silicate weathering) further suggest gradually enhanced secondary mineral formation and intensified weathering. We attribute these spatial variations in δ7Li values to changes in water flow paths that influence weathering intensity and secondary mineral formation. Specifically, longer flow paths of surface and subsurface waters in the lower reaches are facilitated by increased precipitation, greater relief, and fault-related hydrological pathways and could lead to prolonged water-rock interactions and higher δ7Li values. Temporally, δ7Li values, Li flux, silicate weathering rates, and physical erosion rates all correlate with river discharge, underscoring the influence of hydrological conditions on Li mobilization and δ7Li variations. Seasonal changes in water flow paths, driven by variations in precipitation and discharge, result in a δ7Li fluctuation of ∼2.8 ‰. During the wet season, increased discharge could extend water flow paths connected to deep groundwater and long-distance groundwate

关键词： Faulting

Molecular signature of soil organic matter under different land uses in the Lake Chaohu Basin

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Eco-Environment & Health 2022年第4期1卷 212-218页

作者： Han Gao Huixin Li Chen Lin Pedro J.J.Alvarez Caroline A.Masiello Dongqiang Zhu Ao Kong Xiaolei Qu State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China School of Finance Nanjing University of Finance and EconomicsNanjing 210023China Key Laboratory of Watershed Geographic Sciences Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental SciencesMinistry of Ecology and Environment of ChinaNanjing 210042China Department of Civil and Environmental Engineering Rice UniversityHouston TX 77005USA Department of Earth Environmental and Planetary SciencesRice UniversityHouston TX 77005USA School of Urban and Environmental Sciences Peking UniversityBeijing 100871China

The concentration and molecular composition of soil organic matter(SOM)are important factors in mitigation against climate change as well as providing other ecosystem *** quantitative understanding of how land use influences SOM molecular composition and associated turnover dynamics is limited,which underscores the need for high-throughput analytical approaches and molecular marker signatures to clarify this *** a high-throughput untargeted mass spectrometry screening and molecular markers,we show that forest,farmland and urban land uses result in distinct molecular signatures of SOM in the Lake Chaohu *** markers indicate that forest SOM has abundant carbon contents from vegetation and condensed organic carbon,leading to high soil organic carbon(SOC)*** SOM has moderate carbon contents from vegetation,and limited content of condensed organic carbon,with SOC significantly lower than that of forest *** SOM has high abundance of condensed organic carbon markers due to anthropogenic activities but relatively low in markers from ***,urban soils have the highest black carbon/SOC ratio among these land ***,our results suggested that the molecular signature of SOM varies significantly with land use in the Lake Chaohu Basin,influencing carbon *** strategy of molecular fingerprinting and marker discovery is expected to enlighten further research on SOM molecular signatures and cycling dynamics.

关键词： High-throughput untargeted mass spectrometry screening Mass spectrum processing algorithm Soil organic matter Molecular signature Land use

Environmental Occurrence, Human Health Risk, and Ecological Risk Assessment of Herbicides in the Taihu Lake Basin, China

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SSRN 2025年

作者： Hu, Min Li, Aimin Fan, Guangcan Qian, Bin Wang, Xinyi Li, Xiuwen Zhang, Yangyang Shi, Peng School of Life Sciences Nanjing University Nanjing210023 China State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing210023 China Nanjing University Yancheng Environmental Testing Technology Co. Ltd. Yancheng224001 China

The occurrence of herbicides in large basins' surface water has attracted significant attention. Here, we investigated the occurrence and spatiotemporal distribution of 26 herbicides in the surface water of 41 sampling sites in the Taihu Basin, China, and assessed water quality safety and ecological health risk. In brief, all 26 herbicides were detected in the surface water of the Taihu Lake Basin, with 18 herbicides detected across all seasons and sampling sites and 13 herbicides showing a detection rate of 100%. And concentrations of 25 and 21 herbicides showed significant differences across different seasons and rivers, respectively. The risk assessment results indicate that the detected concentrations of the 26 herbicides in surface water comply with China's drinking water standards and pose negligible non-carcinogenic risks to human health. However, the herbicides detected in spring, summer, and winter posed medium to high risks to aquatic organisms across fish-algae-crustaceans three trophic levels, and pentazocine, isoproturon, atrazine, and prometryn were identified as reaching high-risk levels. In summer and autumn, the herbicides detected in surface water posed higher risks to submerged plants than fish-algae-crustaceans;herbicides already posed medium risks to submerged plants in autumn, with B-type herbicides being the key contributors to this outcome. © 2025, The Authors. All rights reserved.

关键词： Lakes