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Physiological and metabolic responses of Euglena gracilis to pristine and copper-doped carbon dots

Zhongguo Huanjing Kexue/China Environmental Science 2025年第5期45卷 2913-2925页

作者： Ma, Ping-Jia Cai, Kang-Li Wang, Xin-Wei Li, Mei State Key Laboratory of Water Pollution Control and Green Resource Recycling School of Environment Nanjing University Nanjing210023 China

To elucidate the potential ecological risks of carbon dots, a novel nanomaterial, this study investigated the physiological responses and underlying mechanisms of the freshwater microalgae Euglena gracilis following exposure to pristine carbon dots (CDs) and Cu-N-doped carbon dots (Cu-CDs). The results demonstrated that both types of carbon dots initially promoted but subsequently inhibited the growth of *** over time. Compared to CDs, Cu-CDs exerted a more pronounced impact on key physiological processes, including photosynthesis and antioxidant defense. Exposure to 1mg/L and 10mg/L Cu-CDs resulted in the accumulation of photosynthetic pigments and a decline in photosystem II activity, whereas a significant change in photosynthetic pigment content was observed only at 10mg/L in the CDs-exposed group. The maximum inhibition rates of superoxide dismutase activity induced by CDs and Cu-CDs were 62.52% and 78.35%, respectively. Metabolomics analysis further confirmed that Cu-CDs triggered a stronger metabolic disturbances, with the most notable alterations observed in lipid metabolism pathways, indicating compromised membrane stability of ***. Disruptions in amino acid and photosynthetic metabolism pathways were primarily attributed to oxidative stress. Additionally, both CDs and Cu-CDs affected energy metabolism by altering in alanine, aspartate, and glutamate metabolism, as well as glycolysis/gluconeogenesis pathways. Overall, the impairment of photosynthetic and antioxidant system may represent the primary toxic mechanisms of carbon dots in ***. © 2025 Chinese Society for Environmental Sciences. All rights reserved.

关键词： Sensory perception

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Critical review of perovskites-based advanced oxidation processes for wastewater treatment: Operational parameters, reaction mechanisms,and prospects

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Chinese Chemical Letters 2022年第2期33卷 643-652页

作者： Ruicheng Ji Jiabin Chen Tongcai Liu Xuefei Zhou Yalei Zhang State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Key Laboratory of Yangtze Water Environment for Ministry of Education College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Tongji UniversityShanghai 200092China

In the field of advanced oxidation processes(AOPs) of wastewater, many materials can be used as heterogeneous catalysts. The role of these catalysts is to activate oxidants and generate reactive oxygen species(ROS) to decompose refractory pollutants. Perovskite oxide, an emerging catalyst in the field of AOPs, has been extensively studied in wastewater treatment. Nevertheless, the application of perovskite in AOP systems still faces some problems, such as leaching of metal ions, a small surface area, a low number of active sites, etc. Herein, this critical review comparatively examines the activation mechanisms of peroxymonosulfate, hydrogen peroxide, and peroxydisulfate. Furthermore, the formation pathways of oxidizing species based on recent advances in experimental and theoretical studies were evaluated. In addition, the impacts of water parameters and constituents such as initial p H, oxidant concentration, catalyst dosage,natural organic matter, halide, phosphate, and carbonate were discussed. Finally, a critical discussion and prospects of mechanism exploration and possible materials development are proposed to confront the existing challenges in the application of perovskite oxides in AOPs.

关键词： Perovskite Advanced oxidation processes Wastewater Peroxide Free radical

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Degradation kinetics and disinfection by-products formation of benzophenone-4 during UV/persulfate process

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Environmental Technology (United Kingdom) 2024年第26期45卷 5618-5629页

作者： Hu, Chen-Yan Xiong, Cun Lin, Yi-Li Zhang, Tian-Yang College of Environmental and Chemical Engineering Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems Shanghai University of Electric Power Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan State Key Laboratory of Pollution Control and Resources Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai China

The degradation kinetics, reaction pathways, and disinfection by-products formation of an organic UV filter, benzophenone-4 (BP4) during UV/persulfate oxidation were investigated. BP4 can hardly be degraded by UV alone, but can be effectively decomposed by UV/persulfate following pseudo-first order kinetics. BP4 degradation rate was enhanced with increasing persulfate dosage and decreasing pH from 8 to 5. However, the degradation rate of BP4 at pH 9 was higher than that at pH 8 because of the presence of phenolic group in BP4 structure. and (Formula presented.) were confirmed as the major contributors to BP4 decomposition in radical scavenging experiments, and the second-order rate constants between (Formula presented.) and BP4 as well as those between (Formula presented.) and BP4 were estimated by establishing and solving a kinetic model. The presence of (Formula presented.) and humic acid inhibited the decomposition of BP4, while (Formula presented.) promoted it. The mineralisation of BP4 was only 9.1% at the persulfate concentration of 50 μM. Six degradation intermediates were identified for the promulgation of the reaction pathways of BP4 during UV/persulfate oxidation were proposed as a result. In addition, the formation of DBP in the sequential chlorination was evaluated at different persulfate dosages, pH values, and water matrix. The results of this study can provide essential knowledge for the effective control of DBP formation with reducing potential hazard to provide safe drinking water to the public. © 2023 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Rate constants

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Synergistic Cu single-atoms and clusters on tubular carbon nitride for efficient photocatalytic performances

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Rare Metals 2024年第11期43卷 5891-5904页

作者： Yu-Xiao Feng Hui-Jun Yu Tian-Guang Lu Zi-Ye Zheng Shuang Tian Li Xiang Shan Zhao Shu-Guang Wang Zuo-Li He Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Weihai Research Institute of Industrial Technology of Shandong University Shandong UniversityWeihai 264209China School of Electrical Engineering Shandong UniversityJinan 250061China CEDAR Knight Cancer InstituteSchool of MedicineOregon Health and Science UniversityPortland 97201USA

Metal clusters or even single-atoms dispersed and anchored on the photocatalysts'surface can enhance photocatalytic performances on organic pollutant ***,a simple photoreduction method was used to create atomically dispersed metal single-atoms/clusters(MSCs,M=Cu,Pd,Au and Ag)on P-modulated tubular carbon nitride(TCN).The obtained MSCs@TCN demonstrated excellent photocatalytic performances for the degradation of sulfamethazine(SMZ).In particular,the photocatalyst with 2 wt%Cu loading showed ultrahigh SMZ oxidation efficiency(k=0.06110 min^(-1)),almost three times that of TCN(k=0.02066 min^(-1)).It also shows excellent stability in the 5th-cycle *** improved photocatalytic activity of the CuSCs@TCN is ascribed to the synergistic promotion of photogenerated charge separation by Cu single-atoms/clusters as active sites,accelerated charge transfer from bulk TCN to Cu sites through Cu-N_(x)***,the active sites of Cu single-atoms/clusters could promote the production of·O_(2)^(-),which participates in organic oxidation with strong oxidizing holes(h^(+)).This strategy paves a new avenue for designing high-performance photocatalysts decorated with metal single-atoms and clusters.

关键词： Carbon nitride Photocatalysis Cu single-atom Sulfamethazine Degradation

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Carbon-based single atom catalyst: Synthesis, characterization, DFT calculations

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Chinese Chemical Letters 2022年第2期33卷 663-673页

作者： Yanan Shang Xiaoguang Duan Shaobin Wang Qinyan Yue Baoyu Gao Xing Xu Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityJi’nan 250100China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Carbon-based single-atom catalysts(SACs) with atomic sizes of active sites have become the promising candidates for a variety of catalytic systems because of their high atom utilization, and unique electronic structures. Different types of single-atom sites can be fabricated via multiple preparation strategies, which would demonstrate distinct different coordination configurations and electronic features, and ultimately affected the structure-catalysis relationship of SACs in targeted reactions. As a result, it is necessary to identify the active sites of SACs and understand the structure-catalysis relationship of SACs at the atomic scale. In this review, a variety of preparation strategies of carbon-based SACs were documented. Then, the recent development on versatile characterization techniques and computational achievements were summarized regarding in understanding the electronic and geometric characteristics of carbon-based ***, major challenges and development directions concerning single-atom sites identification and advanced tools development are discussed to shed light on future research of carbon-based SACs.

关键词： Single atom Synthesis DFT calculations Characterization Catalysis

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Risk management of radionuclide waste from nuclear power plants:Removal techniques and control strategies

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National Science Open 2025年第1期4卷 1-3页

作者： Liang Mao Maofa Ge Fangbai Li State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentChemistry and Biomedicine Innovation CenterNanjing UniversityNanjing 210023China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Eco-environmental and Soil Sciences Guangdong Academy of SciencesGuangzhou 510650China

In modern society,the ceaselessly increasing demand for clean energy has spurred the exploration of novel low-carbon *** power has proven its effectiveness in resolving the energy *** the rapid expansion of nuclear power facilitating humanity’s shift towards a low-carbon energy society,proper management of nuclear waste generated by nuclear plants has become crucial for minimizing environmental impacts and alleviating public *** promote the development of removal techniques and control strategies for radionuclides in the wastewater,we have organized a special topic on“Nuclear Environment Advances”in National Science Open(NSO).We have invited nine scientists from different fields to present their latest research findings and prospective analyses of radionuclides in the environment *** attention to nuclear safety,strict regulatory supervision,and enhanced emergency response measures are of great significance for reducing the environmental impact during operation of nuclear *** the impacts of radiation on various organisms to understand the toxicity mechanisms,potential health effects,and dose-response relationships related to radionuclide exposure can help assess the potential consequences of radionuclide leakage and providing information for decision making in risk *** et al.[1]provide an overview and highlight the importance of environmental toxicology in the risk assessment and management of radionuclides,suggesting that both chemical toxicity and radiotoxicity are indispensable in evaluating the toxicology of *** about the absence of environmental pollution standards,they suggest that future research should focus on the long-term impacts of these radionuclides on human health,especially the risks related to low-dose radiation *** the nuclear fuel cycle,radioactive iodine is one of the major gaseous contaminants due to nuclear energy utilization,posing threa

关键词： removal techniques minimizing environmental impacts risk management control strategies nuclear power radionuclide waste clean energy nuclear power plants

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Mesoporous molecular sieve-based materials for catalytic oxidation of VOC: A review

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Journal of Environmental Sciences 2023年第3期125卷 112-134页

作者： Wei Gao Xiaolong Tang Honghong Yi Shanxue Jiang Qingjun Yu Xizhou Xie Ruijie Zhuang Department of Environmental Science and Engineering School of Energy and Environmental EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

As the main contributor of the formation of particulate matter as well as ozone, volatile organic compounds(VOCs) greatly affect human health and the environmental quality. Catalytic combustion/oxidation has been viewed as an efficient, economically feasible and environmentally friendly way for the elimination of VOCs. Supported metal catalyst is the preferred type of catalysts applied for VOCs catalytic combustion because of the synergy between active components and support as well as its flexibility in the composition. The presence of support not only plays the role of keeping the catalyst with good stability and mechanical strength, but also provides a large specific surface for the good dispersion of active components, which could effectively improve the performance of catalyst as well as decrease the usage of active components, especially the noble metal amount. Mesoporous molecular sieves, owing to their large surface area, unique porous structures, large pore size as well as uniform pore-size distribution, were viewed as superior support for dispersing active components. This review focuses on the recent development of mesoporous molecular sieve supported metal catalysts and their application in catalytic oxidation of VOCs. The effect of active component types, support structure, preparation method, precursors, etc. on the valence state, dispersion as well as the loading of active species were also discussed and summarized. Moreover, the corresponding conversion route of VOCs was also *** review aims to provide some enlightment for designing the supported metal catalysts with superior activity and stability for VOCs removal.

关键词： Volatile organic compound Mesoporous molecular sieves Supported catalyst Catalytic oxidation Reaction mechanism Influencing factors

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Enhancing hydrogen evolution reaction performance of transition metal doped two-dimensional electride Ca_(2)N

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Chinese Chemical Letters 2023年第6期34卷 487-491页

作者： Baoyu Liu Ziqiang Chen Rui Xiong Xuhui Yang Yinggan Zhang Teng Xie Cuilian Wen Baisheng Sa Multiscale Computational Materials Facility and Key Laboratory of Eco-materials Advanced TechnologyCollege of Materials Science and EngineeringFuzhou UniversityFuzhou 350100China College of Environmental Science and Engineering Fujian Key Laboratory of Pollution Control&Resource ReuseFujian Normal UniversityFuzhou 350007China College of Materials Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryXiamen UniversityXiamen 361005China

Two-dimensional electride Ca_(2)N has strong electron transfer ability and low work function,which is a potential candidate for hydrogen evolution reaction(HER)*** this work,based on density functional theory calculations,we adopt two strategies to improve the HER catalytic activity of Ca_(2)N monolayer:introducing Ca or N vacancy and doping transition metal atoms(TM,refers to Ti,V,Cr,Mn,Fe,Zr,Nb,Mo,Ru,Hf,Ta and W).Interestingly,the Gibbs free energyΔG_(H*)of Ca_(2)N monolayer after introducing N vacancy is reduced to-0.146 e V,showing good HER catalytic *** is highlighted that,the HER catalytic activity of Ca_(2)N monolayer can be further enhanced with TM doping,the Gibbs free energyΔG_(H*)of single Mo and double Mn doped Ca_(2)N are predicted to be 0.119 and 0.139 e V,*** present results will provide good theoretical guidance for the HER catalysis applications of two-dimensional electride Ca_(2)N monolayer.

关键词： Two-dimensional electride Ca_(2)N Density functional theory calculations Hydrogen evolution reaction Transition metal doping

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Reversibly Tuning Electrochemiluminescence with Stimulated Emission Route for Single-Cell Imaging

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Research 2024年第3期2023卷 205-215页

作者： Cheng Ma Xiaodan Gou Zejing Xing Min-Xuan Wang Wenlei Zhu Qin Xu Dechen Jiang Jun-Jie Zhu School of Chemistry and Chemical Engineering Yangzhou University.Yangzhou 225002P.R.China State Key Laboratory of Analytical Chemistry for Life Science State Key Laboratory of Pollution Control and Resource ReuseSchool of Chemistry and Chemical EngineeringSchool of the EnvironmentNanjing UniversityNanjing 210023P.R.China.

Electrochemiluminescence (ECL) has established itself as an excellent transduction technique in biosensing and light-emitting device, while conventional ECL mechanism depending on spontaneous emission of luminophores lacks reversibility and tunable emission characters, limiting the universality of ECL technique in the fields of fundamental research and clinical applications. Here, we report the first observation of stimulated emission route in ECL and thus establish a reversible tuning ECL microscopy for single-cell imaging. This microscopy uses a focused red-shifted beam to transfer spontaneous ECL into stimulated ECL, which enables selective and reversible tuning of ECL emission from homogeneous solution, single particles, and single cells. After excluding other possible competitive routes, the stimulated ECL emission route is confirmed by a dual-objective system in which the suppressed spontaneous ECL is accompanied by the enhanced stimulated ECL. By incorporating a commercial donut-shaped beam, the sharpness of single-cell matrix adhesion is improved 2 to 3 times compared with the counterpart in confocal ECL mode. The successful establishment of this stimulated emission ECL will greatly advance the development of light-emitting device and super-resolution ECL microscopy.

关键词： tuning beam limiting

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Biocomposite based on graphene oxide immobilized Pseudomonas psychrotolerans for the recovery of Y(III) in acid mine drainage

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Chemosphere 2024年 346卷 140589页

作者： Zhang, Chenxin Chen, Wei Zhang, Tao Chen, Zuliang Fujian Key Laboratory of Pollution Control and Resource Reuse School of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350007 China

Rare earth elements (REEs) recovery is a critical issue concerning both resource recovery and wastewater utilization. In this study, a new bio-composite was fabricated using graphene oxide immobilized Pseudomonas psychrotolerans (PP@GO), which was isolated from the soil of REEs mine. Results showed that 99.6% Y(III) was removed in 48 h and various characterization confirmed that S–S, –NH2, HPO42−, –OH and –COOH from extracellular polymeric substances (EPS) secreted by microorganisms formed complexation with Y(III). As well, the Y(III) adsorption best followed Freundlich isotherm and non-linear pseudo-second-order kinetic model having R2 of 0.985 and 0.996, respectively, demonstrating that the adsorption was governed by multilayered chemisorption. Additionally, the effectiveness of PP@GO was not limited to Y(III), where 27.9% of this substance was removed in acid mine drainage (AMD), also exhibited great adsorption for other REEs, such as Er (45.0%) and Ho (43.8%). Furthermore, the adsorption efficiency of Y(III) remained high (70.0%) after a 5th cycle, emphasizing the consistent stability of PP@GO. Finally, REEs adsorbed could be greatly desorbed by KNO3, like Sm (80.1%) and La (80.0%), which revealed that PP@GO has great potential to recover REEs in AMD. Overall, this study offers a promising strategy for the green and sustainable REEs recovery and wastewater treatment. © 2023 Elsevier Ltd

关键词： Rare earths

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