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environmental behavior of microplastic - heavy metal synergistic contamination in a typical urban-rural river network

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Emerging Contaminants 2025年第3期11卷

作者： Zhang, Kaihang Huang, Jian Zhang, Jiamei Zhang, Hua Xi, Shanshan School of Environmental and Energy Engineering Anhui Jianzhu University Hefei 230601 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Hefei 230601 China Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province Hefei 230601 China

Microplastics (MPs) and heavy metals (HMs) in rivers pose a global threat to human health and the ecological environment. Given the differences in pollutant classes, the co-occurrence and interactions between MPs and HMs are still poorly understood. In this study, the co-occurrence of MPs and HMs across different seasons were investigated in the urban-rural rivers of a typical inland city, China. MPs and HMs were detected in all water samples at the wet and dry seasons, and the differences in the abundance of MPs and HMs between the two water periods were not significant. The abundance of MPs was higher in urban and industrial zones than that in agricultural zones. The predominant form and composition of MPs was granules (44.49 %) and polyethylene terephthalate (PET, 85.40 %), with the most common color being transparent (48.99 %). HMs (Mn, Cu, Cr, Zn, Cd, Pb) were detected in MPs, with the strongest adsorption capacity observed for Mn (K_pw = 4.90). Based on the correlation analysis and structural equation model, the polymer type of MPs (path coefficient = 0.3798) and the content of HMs in water (path coefficient = 0.3391) were the significant influence drivers on the adsorption of HMs by MPs. The Hazard Index revealed a medium risk of MPs in the urban-rural rivers, while the pollution Load Index indicated a low risk of the river water body. These findings suggest that synergistic pollution from MPs and HMs may increase the ecological risk in river water, and the results provide important data for understanding the characteristics of the urban-rural rivers. © 2025 The Authors

关键词： Heavy metal Influence drivers Microplastic Synergistic-contamination Urban-rural rivers

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Superior adsorption of tetracycline onto magnetic rectorite/algal sludge/lake sediment composite

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Journal of the Taiwan Institute of Chemical Engineers 2025年 172卷

作者： Zeng, Ting Liu, Rui Zhou, Peijiang Gao, Guiling Chen, Chaoqi Institute of International Rivers and Eco-Security Yunnan University Kunming650500 China School of Ecology and Environmental Science Institute for Ecological Research and Pollution Control of Plateau Lakes Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks Yunnan University Kunming650500 China School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan430079 China

Background: The development of effective technologies for removing tetracycline (TC) from aquatic environments is crucial. In this study, the superior adsorption and separation properties of Fe-RASs for TC were investigated, and the removal mechanism of TC was proposed. Methods: Fe-RASs were synthesized by metal modification methods (impregnation and co-precipitation) and iron valences (Fe2+, Fe3+, and Fe6+). The structure and physicochemical properties of Fe-RASs were characterized by SEM, XRD, FTIR, BET, XPS, and VSM. The influence of pH and temperature on the adsorption characteristics, as well as the adsorption isotherm and kinetics was investigated. Significant findings: Fe6+-RAS, prepared by pyrolysis following impregnation with K2FeO4, shows superior TC adsorption capacity (Qm: 191.32 mg/g), presenting an efficient and eco-friendly adsorbent. The adsorption mechanism mainly includes pore filling, surface complexation, π-π interaction, hydrogen bonding and electrostatic interaction. Fe-RASs are easy to recover and reduce secondary contamination. In summary, this study realizes the conversion of solid waste into value-added products for environmental remediation, and is expected to offer valuable references on the synthesis method and appropriate iron sources for the pyrolysis of magnetic materials. © 2025 Taiwan Institute of Chemical Engineers

关键词： Impregnation

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Simultaneous hydrogen production with photo reforming of lactic acid over MXene derived MoS_(2)/TiO_(2)/Ti_(3)C_(2)nanowires

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Chinese Journal of Catalysis 2025年第4期71卷 234-245页

作者： Seemal Mansoor Zixu Hu Yuxin Zhang Muhammad Tayyab Mazhar Khan Zeeshan Akmal Liang Zhou Juying Lei Muhammad Nasir Jinlong Zhang Key Laboratory for Advanced Materials Shanghai Engineering Research Center for Multi–media Environmental Catalysis and Resource UtilizationJoint International Research Laboratory of Precision Chemistry and Molecular EngineeringFeringa Nobel Prize Scientist Joint Research CenterSchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical ProcessEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090HeilongjiangChina Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina COMSATS Univ Islamabad Interdisciplinary Res Ctr Biomed Mat IRCBMLahore CampusLahore 54000Pakistan

Developing efficient photocatalysts to address collaborative energy and environmental crises still faces significant *** this report,we present a highly efficient MXene–based photocatalyst,which is combined with MoS_(2)nano patches and TiO_(2)/Ti_(3)C_(2)(TTC)nanowires through hydrothermal *** all the composites tested,the optimized photocatalyst gave a remarkable H_(2)and revolving polylactic acid(PLA)into pyruvic acid(PA).Achieving a remarkable H_(2)evolution rate of 637.1 and 243.2μmol g^(−1)h^(−1),in the presence of TEOA and PLA as a sacrificial reagent under UV-vis(λ≥365 nm)light *** improved photocatalytic activity is a result of the combination of dual cocatalyst on the surface of TTC photocatalyst,which create an ideal synergistic effect for the generation of PA and the production of H_(2)*** MoS_(2)TiO_(2)/Ti_(3)C_(2)(MTT)composite can generate more photoexcited charge carriers,leading to the generation of more active radicals,which may enhance the system's photocatalytic *** work aims at demonstrating its future significance and guide the scientific community towards a more efficient approach to commercializing H_(2)through photocatalysis.

关键词： Photo reforming Polylactic acid Hydrogen evolution Lactic acid Pyruvic acid

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Synthesis of high photocatalytic TiO2 by titanium-oxo-cluster for degradation of tetracycline in water

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Transition Metal Chemistry 2025年 1-10页

作者： Ni, Wenhui Zhang, Qiaoyu Peng, Fumin Li, Sijia Huang, Xu Li, Xumei Huang, Jian Zhang, Hua Luo, Tao School of Chemistry and Chemical Engineering Anhui University Anhui Hefei230039 China Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province Anhui Jianzhu University Anhui Hefei230601 China Anhui Institute of Ecological Civilization Anhui Jianzhu University Anhui Hefei230601 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu University Anhui Hefei230601 China

Tetracycline (TC) is a widely used antibiotic known for its significant antibacterial effects. However, its insufficient metabolism in living organisms and the accumulation of its residues have caused serious impacts on water sources and ecosystems. Photocatalytic technology, favored for its environmentally friendly, efficient, and non-polluting properties, has been applied to degrade TC. In this study, titanium dioxide nanoparticles (T6 and T32) were synthesized using titanium-oxo-clusters (Ti6O6 and Ti32O16) as the titanium source via a simple solvothermal method. Visible light degradation experiments revealed that the degradation rates of TC exceeded 92%, significantly outperforming commercial P25 (70%) and pure anatase TiO2 (68%). Characterization by BET and XRD showed that the synthesized materials exhibited high specific surface areas (T6: 218 m2/g, T32: 207 m2/g) and good crystallinity. The surface complexes formed between the materials and TC enhanced the materials’ responsiveness to visible light (by broadening the absorption edge to 420 nm), playing a key role in the degradation process. Free radical trapping experiments and electron paramagnetic resonance (EPR) results indicated that ·O₂⁻, 1O₂, and h⁺ were the primary reactive species involved in the degradation mechanism. Based on these findings, we propose a plausible degradation mechanism for the material. This study demonstrates that using titanium-oxo-clusters as a novel titanium source for TiO2 synthesis can achieve highly efficient degradation of TC under visible light, offering innovative prospects for the development of future photocatalytic materials. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Titanium dioxide

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Generation of Hydrogen Peroxide by Using Solid Caco3 Suspension Via Two-Electron water Oxidation

SSRN

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SSRN 2025年

作者： Liu, Huimin Luo, Guanghui Han, Qiaozhi Li, Yilin Shen, Yonghao Guo, Siyu Wei, Xinyu Duan, Chengyu Sun, Mengdi Peng, Yang Ou, Zheshun Lu, Yinglong Li, Guosheng Luo, Shuiping Hu, Zhuofeng School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou510006 China Guangdong Provincial Key Laboratory of Environmental Health and Land Resource College of Environmental and Chemical Engineering Zhaoqing University Zhaoqing526061 China Shenzhen Key Laboratory of Energy Electrocatalytic Materials Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Guangdong Shenzhen518055 China

Electrocatalytic two-electron water oxidation method is an attractive option for directly producing H2O2 from water on-site and on-demand. Traditional method often required high-concentration of carbonate electrolyte. However, the concentration of carbonate or bicarbonate in natural water or industrial wastewater seldom reaches such a high level and it is inconvenient to add a lot of these salts. High concentration of carbonate is alkaline and cause serious decomposition of H2O2, and large amounts of soluble salts are difficult to separate from the system and reuse. From this perspective, it is a great challenge to develop a new method for H2O2 generation via two-electron water oxidation without using carbonate or bicarbonate salts. Here, we first report an inhomogeneous system to solve this problem. We used solid calcium carbonate instead of carbonate or bicarbonate to produce H2O2. We combinate the direct reaction pathway (OH-) and indirect reaction pathway (HCO3-) together. During the reaction, calcium carbonate can combine with H+ to produce HCO3- near the electrode. As a result, the concentration of HCO3- near the electrode is high enough to promote indirect pathway for H2O2 generation, while the concentration of HCO3- in the bulk solution is at a very low level. Therefore, we can avoid the disadvantage of high concentration of HCO3- in the bulk solution but obtain a high-efficiency 2e-WOR reaction for H2O2 generation. Finally, the generated H2O2 can also use to degrade organic pollution adsorbed on the calcium carbonate. The solid calcium carbonate is not only cheap and easy to add, but also can be extracted and reused conveniently. This work provides a new strategy for high-efficiency 2e-WOR for H2O2 generation without using high-concentration of bicarbonate and carbonate. © 2025, The Authors. All rights reserved.

关键词： Alkalinity

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Diazotrophic community difference between specialists and generalists in response to arsenic and antimony contaminations

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environmental Research 2025年 278卷

作者： Wang, Yan Xiong, Yiqun Li, Yongbin He, Liu Chen, Mingyue Fu, Rongbin Xiao, Yu Key Laboratory of Industrial Wastewater Treatment and Resource Utilization in Anhui Province East China Engineering Science & Technology Co. Ltd. Hefei230041 China School of Environmental Science and Technology Dalian University of Technology Dalian116024 China Center for Environmental Risk Management & Remediation of Soil & Groundwater State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China Environmental Remediation Co. Ltd. Hangzhou310016 China

Diazotrophs are pivotal in bioremediation, particularly in environments contaminated by metal(loid)s. Despite their significance, the specific impacts of such contamination on the diverse functional groups of soil diazotrophs, including both generalists and specialists, are not well understood. Our study examines the influences of antimony and arsenic contamination on the ecological functions of these diazotrophic groups in areas with high (HC) and low (LC) contamination. Utilizing geochemical analyses, nitrogenase gene (nifH) sequencing, and robust statistical approaches, we assessed the composition and distribution patterns of diazotrophs across different contamination levels. Our results show consistent alpha diversity among diazotrophic subcommunities in both HC and LC sites, highlighting their resilience to metal-induced stress. Generalists exhibited significant compositional shifts between HC and LC sites, whereas specialists remained stable. Network analyses revealed that specialists more frequently occupy central roles than generalists, yet metal stress displaces both groups from these positions within the networks. Deterministic processes were identified as the dominant factors influencing community assembly for both subcommunities. While MST values suggested a similar balance of deterministic and stochastic processes between HC and LC sites, the findings indicate that metal(loid) contamination may still contribute to ecological selection, particularly through Sb and As influencing generalist and specialist composition. These results provide valuable insights into the differential responses of generalist and specialist subcommunities to metal contamination, informing improved ecosystem management and bioremediation strategies. © 2025 Elsevier Inc.

关键词： Microorganisms

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Interfacial-Confined In-Situ growth of NiSe2/CoSe2 nanoparticles on Fluoride-Free Ti3C2Tx for enhanced pseudocapacitive Ion capture

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Chemical Engineering Journal 2025年 509卷

作者： Liu, Ningning Wang, Junce Liang, Mingxing Yu, Fei Ma, Jie Research Center for Environmental Functional Materials State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Water Resources and Water Environment Engineering Technology Center Xinjiang Key Laboratory of Engineering Materials and Structural Safety School of Civil Engineering Kashi University Kashi844000 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen518060 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China College of Oceanography and Ecological Science Shanghai Ocean University No 999 Huchenghuan Road Shanghai201306 China

Transition metal selenides (TMSs) with high specific capacities are regarded as promising electrode materials for capacitive deionization (CDI), but are hindered by insufficient electronic conductivity and large volume effects. Herein, we propose an interfacial-confined in-situ derivation strategy for constructing fluoride-free Ti3C2Tx MXene supported NiSe2/CoSe2 nanoparticles hybrids (Ti3C2Tx@NiSe2/CoSe2), through utilizing the redox reaction products derived from the molten salt etching process as precursors. The robust Ti-O-Ni/Co chemical bonding between Ti3C2Tx and NiSe2/CoSe2 ensure the ultrasmall nanosized NiSe2/CoSe2 particles evenly distributed that leads to expose abundant multi-interface active sites and provides additional pseudocapacitance. Significantly, the fluoride-free Ti3C2Tx MXene with superior electrical conductivity, adjustable surface functional groups and multi-channel pathway further promotes the electrochemical reaction kinetics and preserves significant structural integrity of NiSe2/CoSe2 nanoparticles via the space confinement effect. Ti3C2Tx@NiSe2/CoSe2 exhibits exceptional brackish water desalination performance (130.0 mg g−1 at 1.6 V) and superior cycling stability in the hybrid CDI system. The four-cell CDI stack effectively reduces ion levels in brackish and lake waters to meet Chinese drinking water standards (GB 5749–2022), offering a techno-economic benefit with a treatment cost of $ 0.39 m−3. The proposed strategy in this work enables the rational use of Lewis acidic etching by-products and paves the way for the preparation of MXene/TMSs compound hybrids as advanced CDI anodes. © 2025 Elsevier B.V.

关键词： Desalination

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Black phosphorus quantum dots nanocomposite for fluorescence detection and modulation of β-amyloid protein

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 719卷

作者： Lu, Xue Liu, Yuanyuan Wei, Yaoyao Meng, Changle Zhou, Jie Zhang, Yang Dong, Nuan Zhang, Hua Chen, Wen Zhang, Han Key Laboratory of Xinjiang Phytomedicine Resource and Utilization Ministry of Education/Institute for Safflower Industry Research School of Pharmacy Shihezi University Shihezi832003 China Key Laboratory of Environmental Monitoring and Pollutant Control of Xinjiang Bingtuan School of Chemistry and Chemical Engineering Shihezi University Xinjiang 832003 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

β-amyloid protein (Aβ) deposition and plaque formation are key pathological markers leading to Alzheimer's disease (AD), and effective detection of Aβ can help in the diagnosis and treatment of AD. Near-infrared fluorescence (NIRF) imaging has emerged as an advanced technique for Aβ detection due to its low cost and convenience. In this study, BPQD@PDA-F nanocomposite consisting of black phosphorus quantum dots (BPQD), polydopamine (PDA) and fluorescent probe F were designed for fluorescence detection and modulation of Aβ42 aggregates. BPQD@PDA-F nanocomposite had a good fluorescence response (emission wavelength > 650 nm, and the fluorescence intensity was significantly increased when combined with Aβ42 aggregates), selectivity, fluorescence stability, and could be used for specific fluorescence imaging of Aβ plaques in AD mouse brain slices. Meanwhile, BPQD@PDA-F nanocomposite was a multifunctional nanoplatform that could inhibit Aβ42 aggregates and significantly disaggregate Aβ42 aggregates under near-infrared (NIR) irradiation, reduce the toxicity of Aβ42 aggregates to SH-SY5Y cells. In particular, it could better penetrate the blood-brain barrier (BBB) under NIR irradiation. Therefore, BPQD@PDA-F nanocomposite provided an effective strategy for the detection and modulation of Aβ42 aggregates, which was expected to be used for the diagnosis and treatment of AD. © 2025

关键词： Neurodegenerative diseases

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Synergistic photocatalytic degradation of pyridine using precious metal supported TiO_2 with KBrO_3

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Journal of environmental Sciences 2013年第11期25卷 2299-2305页

作者： Fei Tian Rongshu Zhu Feng Ouyang Environmental Science and Engineering Research Center Harbin Institute of Technology Shenzhen Graduate School Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control

A series of precious metals catalysts （M/TiO/, M = Ru, Rh, Pd, Ag, Ir, Pt or Au） were prepared by a light deposition method and the synergistic photocatalytic degradations of pyridine （20 mg/L） under UV irradiation （365 nm） using M/TiO2 with electron capture agent KBrO3 have been investigated. The results show that KBrO3 has a greatly synergistic role on M/TiO2 and the photocatalytic activity of M/TiO2 is closely related to its work function. Ag could greatly enhance the activity of TiO2 due to the binding characteristics of pyridine on Ag. Under the conditions of 0.5 wt.% Ag loading, Ag/TiO2 concentration of 0.1 g/L, KlrO3 concentration of 10 mmol/L and reaction liquid pH value at 9, the pyridine can be degraded by 64% within 3 hr, doubled than TiO2 photocatalytic system. The degradation kinetics of pyridine follows first-order kinetics and k = 5.53 × 10-3 min^-1.

关键词： pyridine synergistic photocatalysis precious metal titanium dioxide potassium bromate

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Abundant and rare subcommunity assemblages of prokaryotes and eukaryotes controlled by vertical environmental heterogeneity in an urban reservoir

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water Science and Engineering 2025年

作者： Wang, Xun Cao, Huai-yu Gan, Jia-wen Liu, Tang Wang, Pei-fang Yuan, Qiu-sheng Xing, Xiao-lei Du, Cheng-gong Zheng, Yu-ran Liu, Yun-xin Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education and College of Environment Hohai University Nanjing210098 China School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen518055 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen518060 China Yunnan Provincial Key Laboratory of Carbon Sequestration and Pollution Control in Soils Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake Huaiyin Normal University Huai'an223300 China

Reservoirs play a critical role in addressing water resources challenges. However, their vertical influence on the assembly mechanisms of different microbial communities, including prokaryotes and eukaryotes, remains unclear. This study examined the vertical diversity patterns of abundant and rare subcommunities of prokaryotes and eukaryotes in an urban reservoir, using water depth as a geographical gradient and employing high-throughput sequencing. The impact of vertical environmental heterogeneity on community structure was quantified, and key drivers of these dynamics were identified. The results indicated that the urban reservoir exhibited statistically significant differences in the vertical distribution of water temperature and oxidation/reduction potential. The α-diversity of the abundant subcommunity displayed an opposing vertical pattern compared to that of the rare subcommunity, while the β-diversity for both subcommunities of prokaryotes and eukaryotes increased with water depth. Moreover, the distinct diversity patterns of abundant and rare subcommunities were associated with environmental heterogeneity and species adaptability. Notably, the β-diversity of the rare subcommunity of eukaryotes was primarily driven by species turnover in surface water, whereas nestedness became the dominant factor in deeper water. Furthermore, eukaryotic microbes exhibited a more pronounced response to changes in water depth than prokaryotes, consistent with the importance of heterogeneous selection to the eukaryotic community. water temperature significantly affected the community composition of all groups, highlighting its importance in shaping community dynamics. This study provides valuable insights into the vertical distribution and assembly mechanisms of microbial communities in urban reservoirs, contributing to the protection and management of aquatic ecosystems under river regulation. © 2025 Hohai University

关键词： Biotic

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