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Cobalt-copper dual-atom catalyst boosts electrocatalytic nitrate reduction from water

Journal of Hazardous Materials 2025年 493卷

作者： Wei, Jinshan Lin, Hexing Li, Yi Guo, Ying Liu, Shaoqing Sun, Meng Li, Ya-yun Guangdong Provincial Key Laboratory of New Energy Materials Service Safety & Shenzhen Key Laboratory of Special Functional Materials & Shenzhen Engineering Laboratory for Advance Technology of Ceramics College of Materials Science and Engineering Shenzhen University Shenzhen518060 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

Electrochemical nitrate reduction reaction (NO3RR) presents a promising approach for sustainable water denitrification. Yet its practical implementation is hindered by sluggish reaction kinetics. Herein, we develop a nitrogen-doped carbon supported cobalt-copper dual-atom catalyst (CoCu-NC DAC) to significantly enhance the electro-catalytic NO3RR performance. The optimized CoCu-NC DAC demonstrates exceptional activity, achieving a faraday efficiency of 95.3 % and a high NH4+ yield rate of 2.41 mg h−1 cm−2 at −0.6 VRHE, surpassing the performance of conventional Cu/Co single-atom catalysts. In-situ analysis and density functional theory calculations confirm that the synergistic effects arising from (1) optimized electronic structure for balanced intermediate adsorption, and (2) enhanced surface H concentration facilitating NOx hydrogenation. This work not only provides fundamental insights into the DACs, but also offers a practical solution for groundwater nitrate remediation, opening new avenues for the application of atomically dispersed catalysts. © 2025 Elsevier B.V.

关键词： Electrolytic reduction

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Alkaline molten salt thermal treatment of mixed waste plastics for oil production: Insight into the effects of molten salt alkalinity and plastic molecular structure

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Fuel 2025年 399卷

作者： Ren, Yang Dai, Qiqi He, Jing Hu, Hongyun Li, Xian Li, Aijun Zhang, Changbin Yao, Hong State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen518000 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

Pyrolysis has emerged as the primary strategy for recycling waste plastics into oil. However, the low thermal conductivity of plastics results in inefficient heat transfer and extended residence times, which is unfavorable for oil production. Here, a novel method by using thermally stable alkaline molten salt as an effective medium to enhance heat transfer and thermal reaction was proposed. The oil yield exhibited a direct correlation with molten salt alkalinity. NaOH-Na2CO3 system achieved remarkable gas upgrading: >99 % chlorine immobilization coupled with alkali-mediated hydrogen enrichment (H2 ratio > 80 %), enabled by catalytic carbon-alkali interactions. Plastic molecular structures governed product selectivity during molten salt thermal treatment: polyolefins (PE/PP) predominantly yielded α-olefins through promoting β-scission reactions, while polyvinyl chloride (PVC) and polystyrene decomposition generated aromatic hydrocarbons (BTX, styrene) via enhancing dehydrochlorination and aromatization. In co-processing of mixed plastics, weak interactions existed between PE and PP during both conventional and molten salt conversions, with product distributions resembling linear combinations of individual pyrolysis results. PVC-PS blends exhibited significant cross-reactivity: HCl evolved from PVC decomposition engaged in secondary reactions with styrene (PS product). Primary radicals on PS chains post-scission drove depolymerization pathways, elevating ethylbenzene/α-methylstyrene formation at the expense of styrene monomers. Molten salt reduced PVC-PS cross-reactivity via chlorine capture and H-radical redistribution, increasing styrene monomer yields by 142 %. These findings facilitate the high-value recycling of mixed waste plastics for oil production. © 2025 Elsevier Ltd

关键词： Isomers

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Toward net-zero cement: linking demand-side measures with plant-level technology strategies

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Resources, Conservation and Recycling 2025年 220卷

作者： Song, Xinke An, Kangxin Wang, Rui Liu, Gang Wang, Can State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Earth System Science Tsinghua University Beijing100084 China College of Urban and Environmental Sciences Peking University Beijing100871 China Institute of Carbon Neutrality Peking University Beijing100871 China

Achieving climate goals in the cement sector requires combining supply- and demand-side strategies. To explore this interplay, this study develops a spatially explicit modeling framework that integrates sectoral decarbonization pathways and plant-level optimization. Results show that, in 2060, incorporating demand-side measures—compared to relying solely on supply-side technologies—reduces required carbon capture and storage (CCS)-equipped clinker capacity from 941.9 to 353.8 Mt/year, inter-provincial CO₂ transport from 182.6 to 41.7 Mt/year, and mitigation costs from 246 to 217 CNY/tCO₂. These measures also enable net-negative emissions of -69.0 Mt CO₂/year. Spatial analysis highlights Henan, Hebei, Sichuan, and Anhui provinces as priority regions for CCS deployment across all scenarios, reflecting the existing industrial structure and proximity to geological storage sites. These findings offer practical insights for optimizing plant-level technology choices, strengthening regional coordination, and advancing integrated mitigation policy development. © 2025

关键词： Carbon capture and storage Cement industry Demand-side transformation Net-zero Spatial optimization

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Graphene-Diyne-Supported Single Transition Metal Atom Catalysts for Co₂ Capture and Co₂ Hydrogenation Conversion

SSRN

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SSRN 2025年

作者： Zhang, Runze Niu, Xiaowei Chen, Zhen Ding, Juan Wang, Chengxin Tang, Yixuan Hou, Yongxia Huang, Jiayi Wang, Yun College of Environment Liaoning Province Pollution Environmental Remediation Technology Innovation Center Liaoning Key Laboratory of Clean Energy and Carron-Neutral Technology Shenyang University Shenyang110044 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Jiaxing Nanhu University School of Mechanical and Electrical Engineering Zhejiang314001 China Shenyang University China

The rising concentration of carbon dioxide (CO₂), a significant greenhouse gas, demands efficient strategies for its capture and conversion into valuable chemicals. Traditional catalysts face challenges like low efficiency and poor selectivity in CO₂ reduction reactions (CO₂RR). This study uses first-principles calculations to explore graphene-diyne (GDY) supported single-atom transition metal catalysts (Ni, Fe, Mo, Ru) for CO₂ capture and hydrogenation. The results show that Ru@GDY demonstrates the highest catalytic activity with strong CO₂ adsorption energy (-0.82 eV) and efficient pathways for producing methane (CH₄) and methanol (CH₃OH). Mo and Fe also exhibit stable structures and significant potential for CO₂ activation. Analysis of bandgap tuning, charge transfer, and reaction intermediates (*HCO, *COH) reveals how metal-carbon bonding enhances catalyst performance. This research advances the understanding of single-atom catalysts and provides insights for designing efficient systems for CO₂ capture and conversion, contributing to sustainable energy solutions © 2025, The Authors. All rights reserved.

关键词： Hydrogenation

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Anaerobic stabilization and landscape utilization of rural sewage sludge from the enhanced membrane coagulation process

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Science of the Total environment 2025年 958卷 177902页

作者： Xu, Heng Wei, Shanghui Chen, Song Wang, Kaijun Holmes, Dawn E. Yuan, Quan Beijing100083 China School of Ecology and Environment Beijing Technology and Business University Beijing100048 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Physical and Biological Sciences Western New England University 1215 Wilbraham Road SpringfieldMA01119 United States

In this study, enhanced membrane coagulation (EMC) sludge was subjected to various alkaline (pH 7.2, 10, and 11), temperature (35 °C and 55 °C), and duration (0.5 h and 1 day) pretreatment conditions before being inoculated into biogas reactors operated for 176 days. Optimal pretreatment (pH 11, 55 °C, and 1 day) effectively hydrolyzed particulate COD to SCOD (8435 ± 121 mg/L). Higher pH levels also facilitated the dissolution of amphoteric aluminum-phosphorus (Al-P) compounds, enhancing phosphorus release (91.8 mg/L) from the sludge. This alkaline pretreatment, especially under optimal conditions, significantly increased biogas production and methane concentrations in long-term semi-continuous anaerobic digesters, with methane yields of 188.4 mL/gVS. The microbial community structure in all three reactors exhibited similar shifts, with saccharolytic and proteolytic fermentative bacteria dominating early stages and Thermovirga and an uncultured bacterium (Run-SP154) prevalent in later stages. Methanothrix, an acetotrophic methanogen, dominated the archaeal community in the inoculum (>91 %) and remained prominent (>40 %) throughout the experiment, while hydrogenotrophic methanogens from the genus Methanolinea increased over time, accounting for >24 % of the sequences in the final stages. Additionally, the feasibility of using EMC digestate as fertilizer for mulberry plants was tested, showing that digestate from optimally pretreated sludge promoted better growth than conventional chemical fertilizers. This suggests that this approach is a promising method for decentralized sewage treatment systems. © 2024

关键词： Anaerobic digestion

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Towards rational design of Cu-SSZ-13 catalysts with less N₂O formation in NH₃-SCR reaction: The effect of Brønsted acid sites

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Journal of environmental Sciences (China) 2025年 157卷 546-557页

作者： Liu, Jianqi Du, Jinpeng Wang, Jingyi Han, Shichao Shan, Yulong Zhang, Yan Wu, Xuanhao Gao, Shan Yu, Yunbo Wu, Zhongbiao Shan, Wenpo He, Hong Fujian Key Laboratory of Atmospheric Ozone Pollution Prevention Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China University of Chinese Academy of Sciences Beijing 100049 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo 315800 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China Department of Environmental Engineering Zhejiang University Hangzhou 310058 China Zhejiang Tianlan Environmental Protection Technology Co. Ltd. Hangzhou 311202 China

Ammonia Selective Catalytic Reduction (NHs-SCR) technology has been employed to eliminate NOx from diesel engine exhaust, with Cu-SSZ-13 serving as the commercial catalyst. The greenhouse gas N2O is produced as a bypr... 详细信息

Ammonia Selective Catalytic Reduction (NHs-SCR) technology has been employed to eliminate NO_x from diesel engine exhaust, with Cu-SSZ-13 serving as the commercial catalyst. The greenhouse gas N₂O is produced as a byproduct when using Cu-SSZ-13 as the NH₃-SCR catalyst. To achieve synergistic control of pollutants and greenhouse gases in diesel engine exhaust, rational design of Cu-SSZ-13 catalysts is required. In this study, the effect of Brønsted acid sites in Cu-SSZ-13 catalysts on the formation of N₂O was investigated. Mild thermal treatment was innovatively employed to prepare Cu-SSZ-13 catalysts with different amounts of Brønsted acid sites. EPR, H₂-TPR, NH₃-TPD, NMR were utilized to determine that the Brønsted acid sites were modified while the Cu species remained unchanged. Thereby an accurate assessment of the influence of Brønsted acid sites on N₂O formation could be achieved. Our results showed that Cu-SSZ-13 with more Brønsted acid sites produced less N₂O during the NH₃-SCR reaction. In the low-temperature region, the presence of framework acid sites facilitates the decomposition of the NH₄NO₃ assisted by NO to form N₂ and H₂O, reducing the formation of N₂O. In the high-temperature region, the Brønsted acid sites promote the decomposition of NH₂NO into N₂ and H₂O. Meanwhile, the N₂O-SCR reaction can also be promoted by Brønsted acid sites, thereby decreasing N₂O emissions. This study suggests that in the future design and synthesis of Cu-SSZ-13 zeolites, attention should be paid to creating more Brønsted acid sites in Cu-SSZ-13 to reduce N₂O emissions. © 2024

关键词： Brønsted acid sites Cu-SSZ-13 zeolite N2O emission control NH3-SCR NOx abatement

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Kinetic Modeling of Secondary Organic Aerosol in a Weather-Chemistry Model: Parameterizations, Processes, and Predictions for GOAmazon

ACS ES&T Air

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ACS ES&T Air 2025年第2期2卷 249-263页

作者： Yicong He Kelsey R. Bilsback Manish Shrivastava Rahul A. Zaveri John E. Shilling John H. Seinfeld Bin Zhao Shuxiao Wang Christopher D. Cappa Jeffrey R. Pierce Shantanu H. Jathar Department of Mechanical Engineering Colorado State University Fort Collins Colorado 80523 United States；State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China Department of Mechanical Engineering Colorado State University Fort Collins Colorado 80523 United States；PSE Healthy Energy Oakland California 94612 United States Pacific Northwest National Laboratory Richland Washington 99354 United States Divison of Chemistry and Chemical Engineering California Institute of Technology Pasadena California 91125 United States State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China Department of Atmospheric Science Colorado State University Fort Collins Colorado 80521 United States Department of Civil and Environmental Engineering University of California Davis Davis California 95616 United States Department of Mechanical Engineering Colorado State University Fort Collins Colorado 80523 United States

Secondary organic aerosol (SOA) forms and evolves in the atmosphere through many pathways and processes, over diverse spatial and time scales. Hence, there is a need to represent these widely varying kinetic processes in large-scale atmospheric models to allow for accurate predictions of the abundance, properties, and impacts of SOA. In this work, we integrated a kinetic, process-level model (simpleSOM-MOSAIC) into a weather-chemistry model (WRF-Chem) to simulate the oxidation chemistry and microphysics of atmospheric SOA. simpleSOM-MOSAIC simulates multigenerational gas-phase chemistry, autoxidation reactions, aqueous chemistry, heterogeneous oxidation, oligomerization, and phase-state-influenced gas/particle partitioning of SOA. As a case study, the integrated WRF-Chem-simpleSOM-MOSAIC (WC-SSM) model was used to simulate the photochemical evolution downwind of a large city (Manaus, Brazil) in the Amazon and, in turn, study the anthropogenic and biogenic interactions in an otherwise pristine environment. Consistent with previous work, we found that OA was enhanced by up to a factor of 4 in the urban plume due to elevated hydroxyl radical (OH) concentrations, relative to the background, and that this OA was dominated by SOA from biogenic precursors (80%). In addition to accurately simulating the OA enhancement in the urban plume, the model reproduced the magnitude of the OA oxygen-to-carbon (O:C) ratio and broadly tracked the evolution of the aerosol number size distribution. Our work highlights the importance of including an integrated, kinetic representation of SOA processes in an atmospheric model.

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Independent of alkalinity addition: Ammonia recovery via gas permeable membranes driven by self-sustained alkalinity in anaerobic digestate with low-rate aeration

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Journal of Water Process Engineering 2025年 74卷

作者： Wu, Linjun Li, Huan Zhou, Yuexi Shen, Zhiqiang Zuo, Jiane State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environment Sciences Beijing 100012 China Research Center of Environmental Pollution Control Engineering Technology Chinese Research Academy of Environmental Sciences Beijing 100012 China Tsinghua Shenzhen International Graduate School Shenzhen 518055 China

This research evaluated the efficacy of self-sustaining alkalinity driven gas permeable membrane (SSAD-GPM) in ammonia recovery under low-rate aeration. This research initially confirmed the role of HCO₃⁻ and CO₃²⁻ in enhancing alkalinity release and ammonia conversion. It was determined that providing alkalinity through HCO₃⁻ necessitates the consumption of inorganic carbon (IC), and highlighting the criticality of maintaining a HCO₃⁻/NH₄⁺ ratio exceeding 1.0 to optimize ammonia removal efficiency (>90.5 %). Alkalinity via CO₃²⁻ involves a two-stage hydrolysis process, consuming IC only in the second phase. Then, comparing SSAD-GPM with alkalinity addition driven GPM (AAD-GPM) for real anaerobic digestate treatment, SSAD-GPM demonstrated an initial ammonia removal efficiency of 99.1 %, which reduced to 82.8 % after 40 days of operation. In contrast, the efficiency of AAD-GPM decreased to 62.6 %. Superior anti-fouling performance of SSAD-GPM, due to aeration-induced turbulence, mitigated concentration polarization and fouling. Efficiency was restored to 98.1 % post-cleaning with tap water. Lastly, this research assessed the alkalinity consumption and cost of various ammonia removal/recovery strategies, demonstrating that SSAD-GPM can substantially lower operating costs, yielding a net profit of $0.081/kg N. These findings underscore the potential of SSAD-GPM as a cost-effective approach for treating high ammonia‑nitrogen wastewater with sufficient self-sustaining alkalinity (HCO₃⁻/NH₄⁺ > 1.0). © 2025 Elsevier Ltd

关键词： Ammonia recovery Anaerobic digestate Gas permeable membrane Low-rate aeration Self-sustaining alkalinity

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Waste photovoltaic wafers-derived SiC-based photocatalysts for pharmaceutical wastewater purification: S-scheme, waste utilization, and life cycle assessment

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Resources, Conservation and Recycling 2025年 220卷

作者： Teng, Chengyao Huang, Qing Cheng, Yunyan Zhang, Zhongyi Zhang, Li Zhu, Jianming Xu, Lijun Song, Qingbin Bian, Zhenfeng Li, Jinhui Yuan, Wenyi School of Resources and Environmental Engineering Shanghai Polytechnic University No. 2360 Jinhai Road Shanghai201209 China Macao Environmental Research Institute Macau University of Science and Technology Macao999078 China MOE Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Normal University Shanghai200234 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Waste photovoltaic (PV) wafers recovered from modules by physical crushing contain high levels of impurities and are unsuitable for reuse. This research demonstrates the successful regeneration of SiC (r-SiC) nanowires photocatalysts from these discarded PV wafers. The r-SiC exhibits enhanced photoactivity and reduces environmental emissions compared to market SiC, as evidenced by a life cycle assessment. By synthesizing ZnxCd1-xS/r-SiC (ZxC1-xSS) photocatalysts featuring a S-scheme heterojunction and internal electric field (IEF)-driven •OH production capability, we have not only repurposed waste but also achieved an unprecedented leap in photocatalytic efficiency. The resulting 20 %Zn0.2Cd0.8S/r-SiC (20Z0.2C0.8SS) photocatalyst exhibited a remarkable 96.67 % cefaclor (CEC) degradation efficiency under visible light within 30 min—outperforming r-SiC by 126-fold and Zn0.2Cd0.8S by 44-fold, and enabling efficient pharmaceutical wastewater degradation. This pioneering research not only turns waste into a valuable resource but also establishes a new benchmark in photocatalytic technology, providing profound insights into the mechanisms underpinning ZxC1-xSS photocatalysts. © 2025

关键词： Photocatalysts

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Carbon, Nitrogen Cycling Microbes and Functional Genes Drive the Spread Mechanism of Antibiotic Resistance Genes in Landfill Humus Soil at Different Depths

SSRN

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SSRN 2025年

作者： Zhang, Zishuai Yang, Bingmei Zhang, Chi Dang, Qiuling Su, Jing Xi, Beidou State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China Key Laboratory of Groundwater Pollution Simulation and Control Ministry of Ecology and Environment Chinese Research Academy of Environmental Sciences Beijing100012 China

The resource utilization of landfill humus soil (LHS) is essential to the treatment of landfill., however, LHS poses ricks of antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) spreading. The present study revealed the mechanism of ARGs and MGEs spread driven by carbon (C), nitrogen (N) cycling microbes and functional genes at different depths of LHS. As depth increased, the abundance and diversity of C, N microbes, functional genes, ARGs and MGEs declined. C and N cycling processes were significantly correlated with the dissemination of ARGs and MGEs (p © 2025, The Authors. All rights reserved.

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