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Catalytic ozonation of 2,3-dimethylpyrazine using CN-doped Mn3O4

Zhongguo Huanjing Kexue/China environmental Science 2025年第3期45卷 1251-1259页

作者： Chen, Yi He, Yin-Ning Wang, Da Song, Shuang Ma, Jun Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province College of Environment Zhejiang University of Technology Hangzhou310032 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150006 China

A CN-supported Mn3O4 (Mn3O4-CN) composite was synthesized as a catalyst for the catalytic ozonation of 2,3-dimethylpyrazine degradation in wastewater. The catalytic efficiencies of 2, 3-dimethylpyrazine were investigated under various ozone dosages, catalyst dosages, pH and temperature conditions. The results showed that under the conditions of an ozone dosage of 3mg/L, a catalyst dosage of 0.02g/L, pH =7 and a temperature of 10°C, the degradation rate of pollutants reached 100% within 20 min. Scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and other characterization methods were used to analyze the properties of the prepared Mn3O4-CN. It was confirmed that Mn3O4 and CN were successfully bonded, and the valence states of Mn were mostly +2 and +3. The reactive oxygen species analysis demonstrated that the surface hydroxyl groups and oxygen vacancies were identified as the main active sites, and .OH was the main active oxygen species generated in the reaction system. The cyclic experiments showed that the Mn3O4-CN has good stability and reusability. © 2025 Chinese Society for environmental Sciences. All rights reserved.

关键词： Ozonization

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Strategy for repurposing waste anion exchange resins to construct a biofilter for removing dissolved organic matter: performance and mechanism

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water Research 2025年 281卷

作者： Zhu, Xingqi Jiang, Lu Tian, Yechao Wang, Leyi Pan, Yang Li, Wentao Li, Aimin State Key Laboratory of Water Pollution Control and Green Resource Recycling School of the Environment Nanjing University Jiangsu Nanjing210023 China

Anion exchange resins are widely employed in wastewater and drinking water treatment plants to remove dissolved organic matter (DOM). However, the degradation of resin performance necessitates the discontinuation of these treatment projects, resulting in the idling of underperforming resins, referred to as waste anion exchange resins (WAER). Given the substantial investment in operational costs, determining how to economically utilize WAER is essential for restarting the treatment projects. Therefore, this study proposed a strategy for repurposing WAER to construct a biofilter for DOM removal. A biofilter, termed biological anion exchange resin (BAER), was developed using WAER and compared with two conventional biofilters: biological activated carbon (BAC) and sand filter. After the acclimatization period, the BAER biofilter achieved a removal of up to 21.42 % of dissolved organic carbon (DOC), which is 5.8 times greater than the removal rate of the sand filter and comparable to the BAC. Notably, BAER exhibited the highest removal rate of aromatics, achieving 41.04 % UV254 removal, which are precursors to disinfection byproducts (DBPs). Consequently, BAER demonstrated superior control of DBPs, with a removal efficiency of 39.59 %. Additionally, BAER demonstrated effective removal of humic substances due to the bioregeneration of its adsorption sites, which led to significant differences in both the structural composition and functional expression of the biological community in BAER compared to other biofilters. This study also revealed that the bioregenerated adsorption sites primarily capture DOM through electrostatic attraction rather than ion exchange. Overall, these findings confirm the promising application of the BAER biofilter constructed with WAER and offer valuable insights into the associated removal processes. © 2025

关键词： Wastewater treatment

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Climate change projections for Diamer Division in lesser Himalayas using multi-global climate model ensemble

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environmental Science and pollution Research 2025年第3期32卷 1668-1680页

作者： Ahmad, Didar Faridullah, Faridullah Irshad, Muhammad Bacha, Aziz Ur Rahim Hafeez, Farhan Iqbal, Akhtar Ullah, Zahid Afridi, Muhammad Naveed Alrefaei, Abdulwahed Fahad Nazir, Rashid Department of Environmental Sciences COMSATS University Islamabad Abbottabad Campus Abbottabad22060 Pakistan State Key Laboratory of Urban Water Resource and Environment Shenzhen Key Laboratory of Organic Pollution Prevention and Control School of Eco-Environment Harbin Institute of Technology Shenzhen Shenzhen518055 China Department of Environmental Science and Engineering Fudan University Shanghai200433 China State Key Laboratory of Biogeology and Environmental Geology School of Environmental Studies China University of Geosciences Wuhan430074 China Department of Zoology College of Science King Saud University P.O. Box 2455 Riyadh11451 Saudi Arabia

Pakistan, like many other regions around the world, is experiencing the impacts of climate change, particularly in its northern region. These changes have adverse impacts on ecosystems and biodiversity. Herein, we have investigated future projections of temperature and precipitation trends for three periods historical (HT = 1975–2005), near-term (NT = 2010–2029), and mid-term (MT = 2030–2050) using climate model intercomparison projects along with global climate models (GCMs) including RCP4.5 and RCP8.5. The historical records spanning from 1975 to 2005 reveal that the Chilas region has a notable rise of 8 °C in maximum temperature (Tmax), whereas the Astore district exhibited a trend of decreasing temperatures. When examining the projected temperature trends using GCMs (RCP4.5 and RCP8.5), the Chilas region is predicted to undergo a further increase of 6 °C in Tmax. In contrast, the Babusar region is projected to observe a significant decrease of 2 °C for the period between 2010 and 2050. Additionally, the precipitation results obtained from historical-based analysis for the period 1975 to 2005 indicated that the Babusar area exhibited increased precipitation patterns to 20 mm on an annual basis. Similarly, the Astore region has the most significant decline in precipitation, with a reduction of 40 mm annually. The predicted precipitation patterns for the period between 2010 and 2050 under the RCP8.5 revealed that the Babusar region has maximum precipitation (25 mm). Conversely, the Astore region exhibited reduced precipitation patterns, recording minimum precipitation (40 mm). In the results from RCP4.5, the precipitation showed a similar pattern with a maximum of 35 mm and a minimum of 15 mm in the Babusar and Astore, respectively. The region’s glaciers, snow cover, and land use systems are deteriorated by these changes in temperature and precipitation patterns. The increased winter and decreased summer precipitation under varied temperatures and precipitation cau

关键词： Miocene

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Cost-Effective Mapping of Hyperlocal Air pollution Using Large-Scale Mobile Monitoring and Land-Use Machine Learning

ACS ES&T Air

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ACS ES&T Air 2025年第2期2卷 151-161页

作者： Tie Zheng Yifan Wen Sheng Xiang Pan Yang Xuan Zheng Yan You Shaojun Zhang Ye Wu School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China；College of Environmental Science and Engineering Tongji University Shanghai 200092 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 China Macao Environmental Research Institute Macau University of Science and Technology Macau 999078 China；National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research Institute Macau University of Science and Technology Macao 999078 China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China；Beijing Laboratory of Environmental Frontier Technologies Beijing 100084 China

The advent of large-scale mobile monitoring using fast-response instruments has enabled hyperlocal mapping (≤100 m) of traffic-related air pollution (TRAP), with important implications for air quality management. However, most related studies have been confined within small areas due to the high cost and labor intensity. This study pioneers a cost-effective TRAP mapping method by incorporating large-scale mobile monitoring and land-use machine learning (LUML). Here, over 4.6 million 1 Hz high-frequency measurements (∼1300 h) were collected on a part of major roadways in the Chinese megacity of Shenzhen. Unmeasured locations were estimated by LUML models to reduce measurement costs and labor intensity. Various ML algorithms and varying spatial aggregation segment lengths were incorporated to optimize the model performance. Hyperlocal maps of NO, NO2, and PM2.5were predicted across the entire road network covering over 1700 km2. Based on our results, LU-RF (random forest) for mapping NO and NO2and LU-GBM (Gradient Boosting Machine) for mapping PM2.5, demonstrated superior performance. Deep learning models, in contrast, did not yield comparable results. Finer partitioning of road segments (≤100 m) improved NO prediction performance, but worsened that for NO2and PM2.5. By deployment of optimal ML algorithms and segment lengths, the TRAP mapping accuracy increased by 20–80% compared to conventional land-use regression models. This study provides a promising and cost-effective approach to hyperlocal air pollution mapping and management in cities worldwide.

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Ultrahigh alkali resistance and regeneration capacity of the birnessite deNOx catalysts: A recyclable extraction-insertion strategy

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Separation and Purification Technology 2025年 368卷

作者： Xuan, Yue Zhu, Xiao Wang, Bin Liang, Yanjie Gao, Chuan Li, Bing Wang, Dong Peng, Yue School of Energy and Power Engineering Shandong University Shandong Jinan250061 China State Key Joint Laboratory of Environment Simulation and Pollution Control National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment School of Environment Tsinghua University Beijing100084 China

The selective catalytic reduction (SCR) of NOx with NH3 in biomass combustion flue gas confronts high-concentration alkali metal (K) poisoning. Herein, we propose a recyclable extraction-insertion strategy using acid-treated birnessite-based catalysts to achieve high alkali resistance. Compared to commercial MnO2 catalyst, which suffered severe deactivation after 1 wt% K+ poisoning, the OL-1(H) catalyst showed a surprising enhancement in SCR activity by 1 wt% K+ and only a modest 15.5 % decrease in NOx conversion at 225 °C with 7 wt% K+. Physicochemical characterizations and density functional theory calculations revealed that K+ deposition form K2O on the surface of commercial MnO2, disrupting Mn-O active sites. In contrast, K+ tended to migrate from the outer surface into the interlayer, spontaneously exchanging with H+ in the OL-1(H) catalyst. The inserted K+ coordinated with six O2–, attracting surrounding electron clouds and facilitating electron loss from Mn species with unsaturated outer coordination. This resulted in an enrichment of Mn5c4+-Lewis acid sites, enhancing NH3 adsorption and activation, thereby improving NOx removal via the Eley-Rideal (E-R) mechanism. Equally important, the extraction-insertion process between H+ and K+ further regenerated the K-poisoned catalyst efficiently, restoring the NOx conversion by 23.3 % at 150 °C. The recyclable extraction-insertion strategy provides a new paradigm for designing catalysts with ultrahigh alkali resistance and regeneration capacity, applicable across various environmental fields. © 2025

关键词： Nitrogen oxides

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Unveiling carbon dynamics in year-round waterlogged pond fields: insights into soil organic carbon accumulation and sustainable management

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Carbon Research 2025年第1期4卷 1-12页

作者： Xiao, Liang Chen, Sijie Han, Fengxiang Wang, Tao Li, Yueshi Li, Wenhan Yuan, Guodong Wu, Jinghua Guangdong Provincial Key Laboratory of Eco-Environmental Studies and Low-Carbon Agriculture in Peri-Urban Areas Guangdong Technology and Equipment Research Center for Soil and Water Pollution Control Zhaoqing University Zhaoqing526061 China Department of Chemistry Physics and Atmospheric Sciences Jackson State University JacksonMS39217 United States Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu610041 China

Agri-ecosystems with flooded fields are pivotal in global carbon (C) dynamics. Although extensive research has focused on carbon sequestration in paddy fields, year-round waterlogged pond fields remain underexplored. This study investigates carbon dynamics in pond fields planted with Semen Euryales for 0, 24, and 60 years, examining soil organic carbon (SOC) accumulation and shifts in its composition. The results revealed a progressive increase in SOC, driven by particulate organic C (POC) and mineral-associated organic (MAOC). SOC increased significantly from 7.49 g kg–1 to 46.10 g kg–1 over the 60 years, with particulate organic carbon (POC) rising from 12.0% to 42.0% and mineral-associated organic carbon (MAOC) decreasing from 87.8% to 58.0%. Lignin phenols, reflecting plant-derived carbon, surged from 11.0% to 68.8%, while amino sugars, indicative of microbial residues, declined from 89.0% to 31.2%, suggesting reduced microbial activity under prolonged anaerobic conditions. Total microbial phospholipid fatty acid (PLFA) decreased by 40.6% and 43.8% after 24 and 60 years, respectively, further supporting the conclusion that anaerobic conditions limit microbial survival. The prolonged waterlogging reduced microbial decomposition, enhancing the accumulation of POC, particularly from plant-derived carbon such as Semen Euryales residues. The accumulation of microbial residues, especially fungal necromass, played a significant role in forming MAOC. That is, continuous waterlogging promoted POC accumulation and also contributed to MAOC stabilization. The findings provide valuable insights into sustainable carbon management practices in pond fields and contribute to climate change mitigation. © The Author(s) 2025.

关键词： Carbon sequestration

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Synergistic oxidation and coagulation of raw water by novel Fe(II)/sulfite process: A comparative study with peroxydisulfate and peroxymonosulfate

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Journal of Hazardous Materials 2025年 493卷 138418页

作者： Lu, Jian Guo, Yuhao Pan, Minyuan Fu, Qi Zhou, Bin Zhang, Tianyang Peng, Zhu Shi, Jun He, Huan Zeng, Chao Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Latest findings demonstrate that the oxidative Fe(II)/sulfite (Fe(II)/S(IV)) process can rapidly generate iron particles, holding potential for coagulation while simultaneously removing emerging contaminants. Herein, we first report the synergistic oxidation-coagulation treatment of RW by Fe(II)/S(IV) process, and compare with traditional Fe-based coagulation (FeSO4, Fe2(SO4)3), Fe(II)/PDS and Fe(II)/PMS processes. Results revealed that the Fe(II)/S(IV) process outperformed traditional Fe-based coagulants, Fe(II)/PDS and Fe(II)/PMS in removing turbidity, UV254, and DOC. For emerging contaminants removal from RW, Fe(II)/PMS showed the highest efficiency, followed by Fe(II)/PDS, while Fe(II)/S(IV) was slightly less effective, it still demonstrated a significant improvement (40 %∼65 %) over traditional coagulation processes. Moreover, the Fe(II)/S(IV) process is the most effective in reducing DBPs formation (56 %∼86 %). Although Fe(II)/PDS and Fe(II)/PMS also significantly reduce DBPs formation, their high oxidation potential at low pH generated toxic N-DBPs. Mechanistic analysis indicated that the Fe(II)/S(IV) process was most effective in removing humic substances and biopolymers. Its moderate oxidation preserved macromolecular structures, enhancing coagulation. And the hydrolysis of S(IV) generates OH⁻, promoting electrostatic neutralization and floc enlargement. Cost analysis revealed that the Fe(II)/S(IV) process is significantly more economical, with costs only 1/60 of Fe(II)/PMS. These results highlight the Fe(II)/S(IV) process as a promising and cost-effective approach to advanced water treatment. © 2025 Elsevier B.V.

关键词： Coagulation

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Research progress on biochar materials for new pollutants removal in the aquatic environment:a mini-review

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Frontiers of environmental Science & Engineering 2025年第3期19卷 99-118页

作者： Wulve Fan Xiaolin Shen Zhiliang Zhu Xiaochang Liu Hua Zhang Yanling Qiu Daqiang Yin State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Key Laboratory of Yangtze River Water Environment(Ministry of Education) Tongji UniversityShanghai 200092China National Engineering Research Centre of Urban Water Resources Shanghai 200082China School of Urban and Regional Science Shanghai University of Finance and EconomicsShanghai 200433China

Antibiotics,endocrine-disrupting compounds(EDCs),per-and polyfluoroalkyl substances(PFAS),and microplastics(MPs)are crucial constituents of the pollutants frequently detected in various aquatic *** pollutants can negatively affect human health and aquatic *** eliminate these new pollutants from water economically and environmentally,biochar is considered an efficient environmental functional material because of its excellent *** numerous studies have reported the concentration,distribution,and removal methods of individual new pollutants,a comprehensive and systematic understanding of biochar-based materials for the removal of multiple new pollutants from aquatic environments remains to be comprehensively ***,in this mini-review,recent research progress on biochar materials in the decontamination of new pollutants,including antibiotics,EDCs,PFAS,and MPs in different water sources,is summarized,and different mechanisms and influencing factors during the removal process are discussed to have a profound understanding of the application of biochar in the water *** studies on biochar materials for the removal of new pollutants are indicated to enlighten future exploration and alleviate new pollutant burdens in aquatic environments.

关键词： Biochar materials New pollutants Aquatic environment pollution Removal mechanisms

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Peracetic acid-driven advanced oxidation processes for wastewater treatment: Demystifying organic radicals and non-radical species

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Critical Reviews in environmental Science and Technology 2025年

作者： Yao, Guanglei Zhou, Xuefei Gao, Haiping Liu, Tongcai Zhang, Yalei Chen, Jiabin State Key Laboratory of Water Pollution Control and Green Resource Recycling College of Environmental Science and Engineering Tongji University Shanghai China Key Laboratory of Yangtze Water Environment for Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai China Shanghai Institute of Pollution Control and Ecological Security Tongji University Shanghai China Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Shandong Qingdao China Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources Tongji University Shanghai China

Peracetic acid (PAA) based advanced oxidation processes (AOPs) have received increasing attention in wastewater treatment. However, it is challenging to identify the radical and/or non-radical species and elucidate the intrinsic interaction mechanisms involved in PAA-based AOPs. This work presents a systematic review of the selective generation mechanisms of radicals (hydroxyl and organic radicals), with a focus on organic radicals, and non-radical species (reactive complexes (RC), high-valent metals (HVM), singlet oxygen (1O2), and electron transfer process (ETP)). Furthermore, we examine various strategies for the precise identification and characterization of radical and/or non-radical species (e.g., quenching, chemical probes, spectroscopy, mass spectrometry, and electrochemical testing), and emphasize existing controversies. Subsequently, we provide an in-depth discussion of the reaction mechanisms between the reactive species and the contaminants/water matrices, as well as the potential for generating halogenated byproducts. Finally, we highlight the challenges and opportunities of the PAA-based AOPs in wastewater treatment, aiming to inspire future research endeavors that promote the practical application of PAA-based AOPs in wastewater treatment. © 2025 Taylor & Francis Group, LLC.

关键词： Free radical reactions

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Stable biofilm formation via nutrition regulation for enhancing toluene removal in gas–solid fluidized-bed bioreactors

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Process Biochemistry 2025年 155卷 84-91页

作者： Fang, Yangdan Lu, Lichao Ou, Guangquan Zhu, Qinqin Sun, Zhuqiu Liu, Ziyu Yeung, Marvin Xi, Jinying Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry Zhejiang Ocean University Zhoushan316004 China Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing100084 China School of Environmental Science and Engineering Yancheng Institute of Technology Yancheng224051 China Taizhou Pollution Control Technology Center Co. LTD Zhejiang Taizhou318000 China

Gas-solid fluidized-bed bioreactors (FBRs), an innovative equipment for gaseous volatile organic compound (VOC) treatment, are used to realize efficient removal of VOCs characterized by large volumes and low concentrations and avoid clogging due to excessive biofilm accumulation. However, difficulties in biomass accumulation caused by stressful environmental pressures, especially shear force, limit their development. In this study, two laboratory-scale FBRs were built, and toluene removal was nearly twiced with saturated relative humidity and adequate nutrition supplement. Accelerated biofilm formation, activated microbial metabolism, enhanced mechanical strength, and surface smoothness were also observed. Nutrition regulation optimized cell synthesis and extracellular polymeric substance secretion through alternation of the accumulation of elements, especially C/N and Ca, which increased by 84 % and 112 %, respectively. The biofilm loss was reduced by 50–75 % under compression and collision conditions, indicating the promoted biofilm stability under shear force caused by extrusion and collision between particles. With the initial drawbacks partially mitigated, nutrient regulation during FBR operation was found to be useful. This study provides theoretical support for further applications of FBRs and efficient treatment of gaseous VOCs with large gas volumes and low concentrations. © 2025

关键词： Fume control

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